n o e l - dtic · midas has been designed for use by persons having less than 40 hours of basic...

7- CR 89.003December 198

An Investigation conducted myN O E L Sponsord"'" NvaloFailitie

Technology Application GroupSponored By Naval Facilities

Contract Report Engineering Command

00

Ln MOORING INTERACTIVE0CV DETAILING AND ASSEMBLY

SYSTEM (MIDAS)REFERENCE MANUAL, REV. 1.2

ARSTRACT IDAS is a computer-aideddesign tool for drafting fleet mooringassembly drawings on the ComputervisionCOS 4000 System. This reference manualincludes a description of an extensivelibrary of mooring components. r)T

- ~Vl1I. ,'e.L~. PORT MU[NEM[ CALIFORNIA 90S00.IC T...

I C

NAVAL CIVIL ENGINEERING LADORAOR'f. oPOR HUNEM. CLWONIA93043-5003

Approed for pblic rele *S. e istibulle i Isllll

00

Unclassified

REPORT DOCUaENATIOW PAGE .7

CR 89.003

Mooring Interactive Detailing and Fina:Assemblv S'stem (MIDAS) Reference Apr 196 - No,~ 10FManual, Rev. 3.2 -

Robert A. McGIll

T echnology Application Group (TAG).3561 Howard Aye, Ste 203A 53-060Los Alamitos, CA -90720 ______

NvlCvil Engieeing Laborator, (?NCEL) Deebrl'Port H~ueneme, CA 9304.3-5003 , .

Naval Far-'11ties EncineEring Comand inclassifie-C200 Scovall StreetAlexandria, VA 22332-2300

Approved :c'r oubli, re-lease; dietr,-Iio.- -

Pcints of Contact: TACO: Bot' MzGill (2!31 ~NCEL: Robert iB0~(~5. S.,

1IDAS as a comp:er-asded desigr ioci for draft:rng fleekmooring assembly drawings or thep Cortputervisiot 4l 00CSystems This reference manual includes a descr;p*.top of aextensive library of mooring components,

DO 1473....... Unclassi fied

NOTICE

The information contained in this manual is subject tochange without nonce. Technology Application Groupshall nt be liable for technical or editoria omissionsmade herein; nor for the incidentai or consequentialdamages resulting from the fuirnishing or use of this

(C) Copyright 1987, Technology Application Group. AllRights reserved. The conactor has been authorized tocopy this document for interna] use.

CADDS, CADDS4X. CDS4000, and Designer VX ameregistered tz-ademarks of Computervson Corporaton.

PostScript is a registered trademark of Adobe Systems.Inc.

Accesion For

KTIS CRA&IDTIC TAB 0Unrannowa.ced 0i

By. ... -

Dtstr 1 ''s

TABLE OF CONTENTS

IN R D C IN....................~.1.

WELCOME TO MIDAS . ........................f you still need help: ..................................................................... I

ABOUT THIS MA U L......................2FINDING YOUR WAY.... .2

Typed Commands ........................................................................ 2

GETTING STARTED ... 3..........................3

ACTIVATING/DEACTIVATING MIDAS ................ 3Deactivating MIDAS ................................................................... 3Refresh Command ....................... ................................................. 3Hardware Considerations .............................................................. 3

INPUT OPERATIONS ---------- -The Cursor ..................................................................................... 4Keyboard ....................................................................................... 4Cancelling a Typed Enry - AQ ........................................................... ACancelling a Routine - ESC Q ............................................................ 5Dynamic Variables ......................................................................... 5Tablet M enus ................................................................................ 5Status Text and Dynamic Menus ................................................... 5

USING THE MIDAS MENUS --------------------------- 6Stacked Menus and Panel Menus ................................................. 6Types of Icons ............................................................................. 6

BASICS OF MIDAS ................................................................. 7

DEFINITIONS ..-. . .. .... ...... 7

MIDAS SUBSYSTEMS OVERVIEW --------------------- AThe MIDAS Menu System ........................................................... 8The Mooring Assemblies .............................................................. 8The Mooring Model .................................................................... 9The MIDAS Library ...................................................................... 10

THE MAIN M N ................................... 12

THE 2D MOORING ASSEMBLIES ...... ............ . ......... 14

THE ASSEMBLY MENU ----. ---............... 14

THE COMPONENT INVENTORY MENU -- _ 16Saving Assemblies ...................................................................... 16

COMPONENT SELECTION MENUS --. . ... ..... isComponent Size ........................................................................... 18Layers ............................................................................................. 18Odd Length Chain ........................................................................ 20"Hidden-Line-Removal" .................................................................. 21Assemblies at Odd Angles. ............................................................... 21Scaled Assemblies ...................................................................... 21Assemblies That Don't Fit. ........................................................... 21Moving Assemblies ...................................................................... 22

VERIFYING ASSEMBLIES ............................................... 24

ASSEMBLY VERIFICATION MENU ................... .24Verifying By Assembly Name .................................................... 24Updating the Assembly Table .................................................... 24Verifying By Assembly Layer .................................................... 24Point-to-Point Verification ......................................................... 24Dimensioning An Assembly ....................................................... 26Length and W eight ........................................................................ 26Attachment Check ..................................................................... 27

RELATIONSHIP TO THE MODEL.........

THE MIDAS DRAWING .................................................. 28

THE SKETCH M

THE COMPONENT FIGURES ......................... .30

THE FIGURE GRAPHICS . . ...

M ating Components ................................................................... 31

PLOTTING THE DRAWING .............. .32

DRAWING TOOLS MENU ........................... 34

FIND NUMBER BUBBLES .......................... 36Moving/Rotating a Bubble ......................................................... 36Bill of M aterials .............................................................................. 36

THE MOORING MODEL ........ ......... ............ 3

The Assembly Table Graphics .......................................................... 38

THE ASSEMBLY TABLE MENU ------------------- -38

READING THE TABLE .............................CAtenary Curves ......................................................................... 41

EDITING THE TABLE ........ 42

USING THE MODEL FOR CAE ------------.- 4 4

APPENDIX A - TROUBLE SHOOTING .................. 46

M enus Disappear ........................................................................ 46Menus Graphics Are Overwritten .............................................. 46Can't Activate Dynamic Menus .......................... 46CII Keypad Doesn't work .......................................................... 46Menu Tabs Overlap Top Menu .................................................... 46Menus Do Not Respond .............................................................. 47Menus Are Out Of Place ............................................................ 47CADDS Graphics Hidden After Zoom Draw .............................. 47Menu Text Garbled ...................................................................... 47Menus Arcs Appear As Polygons ............................................... 47Extra Lines Appear Across the Screen ....................................... 47Menus are Incomplete ................................................................. 48Menu Graphics Do Not Match the Commands ........................... 48

APPENDIX B - FIGURE BUILDING ............................... 49

CONNECTIONS AND CNODES............Relationship to Attachment Check ............................................... 51

SPECIAL CASE COMPONENT FIGURES ........................ ..$2Ground Rings, Spider Plates, Equalizers, Etc .............................. 52Variable Length Components .................................................... 52Non-Reversible Components ......................................................... 53

DESCRIPTION FILE ...Alphanumeric Data ..................................................................... 54Numeric Data ............................................................................. 54Field Format ................................................................................ 55Comments Within the File ......................................................... 55AssignedFields .......................................................................... 55

SAMPLE DESCRIPTION FILE ENTRY .................. S6

APPENDIXK C - TECHNICAL NOES.. ~ 7

INSTALLING NUDAS..... --------.... ----.. .7Hardware Considerations .............................................. 58

CATALOGS USED ..------ -----------............................ 5

WELCOME TO MIDAS

INTRODUCTION

WELCOME TO MIDAS

MIDAS streamlines a wide variety of tasks related to theproduction of fleet mooring assembly drawings. The useof standardized mooring component figures minimizesdrawing time, and an automatic parts list generator ensuresan accurate component count. Moorings designed usingthe MIDAS system can be automatically verified for com-ponent fit, total weight, total length, and ultimate breakingsrength. MIDAS will also build an accurate three dimen-sional model of the mooring for use by subsequent moor-ing analysis programs.

MIDAS has been designed for use by persons having lessthan 40 hours of basic CADDS training and less than 160hours of additional system use. Users with less trainingshould be able to produce assembly drawings with onlyminimal outside help.

MIDAS is a special user environment on top of the stand-ard CADDS graphic system. Them is nothing you can doin CADDS that you can't do when using MIDAS. MIDAScan be used alone or in conjunction with the standardtablet menu, so trained CADDS users can use MIDAS as asupplement to their favorite keyfiles.

MIDAS gets its power from a special library of mooringcomponent figures, accessed, positioned and managed byan intelligent iconic menu system. Once placed into an as-sembly drawing, the components can be repositioned,edited or deleted just like any other CADDS figure. Wehave tried to cover most of the typical user tasks in thismanual, but if you can't find the information you need inthis manual, check the Computervision CADDS UserManuaL

INTRODUCTION

FINDING YOUR WAY

ABOUT THIS MANUAL

FINDING YOUR WAY

The section entitled GETTING STARTED covers the ac-tivation of MIDAS and a brief description of the undedy-ing concepts and basic input operations.

The section on USING THE MIDAS MENUS gives abrief description of he user interface component.

The section on the BASICS OF MIDAS provides defini-tion and a synopsis of the four major subsystems.

The section on THE 2D MOORING ASSEMBLIEScovers the concepts behind assemblies, how to build themand their relation to the model.

VERIFYING ASSEMBLIES describes how to check eachassembly for length, weight, breaking strngth and fit.

The section entitled THE MIDAS DRAWING covers theSketch Menu, the characeistics of the library com-ponents, the Draw Menu and the Plot Menu.

The section entitled THE MOORING MODEL describesthe purpose of the three dimensional mooring model andthe Assembly Table.

Appendix A contains details on building MIDAS com-ponent figures, and Appendix B contains MIDAS loadinginstructions and a list of the catalogs used by MIDAS.

Typed Commands

In a few cases, it will be necessary to use the keyboard totype a command. All keyboard input will be designated inthis manual by the symbol ">>" followed by the requiredtext shown in capital letters as follows

* REQUIRED TEXT <CR>

The <CR> simply indicates that a cariage retum is ex-pected.

2 ABOUT TIWS MANUAL

ACTVATING/DEACTTVATING MIDAS

GETTING STARTED

ACTIVATING/DEACTIVATING MIDAS

To install MIDAS, refer to Appendix C. Once MIDAS hasbeen installed, it is fully opemonal.

(1) Enter CADDS normally by typing*

* CADDS<CR>

(2) At the CADDS prompt, activate MIDAS by typing.

* ACTIVATE MIDAS <CR>

The MIDAS Main menu will appear on the right hand sideof the screen. As soon as it appears. MIDAS is ready foruse.

Deactivating MIDAS

MIDAS, and all other iconic menus which run on the CIIsystem, can be deactivated by typing:

* DEACTIVATE CII <CR>

The screen will be repainted and the menus will no longerbe visible.

Refresh Command

(3) If at any point, the menus are no longer visible, such asafter activating a CADDS part, restore the menus bytyping

* REFRESH <CR>

Hardware Considerations

The MIDAS menus require the Computervision DCUworkstation. MIDAS does not require an APU. All otherworkstation peripherals, such as the keyboard and thetablet, can be actie at the same time. There are no otherhardware requirements.

GETTING STARTED 3

i lIPUT OPERATIONS

INPUT OPERATIONS

The Cursor

The cursor, typically displayed as full screen cross-hairs, isthe pointing device used to select items on the screen. Thecursor is moved about on the screen by moving the pen inthe graphics area of the tablet.

Throughout this manual, the term "select" is used. Itemsare "selected" by placing the cursor anywhere inside of theicon and then pushing the lower button of the stylus once.This is known as a "digitize". Placement of the cursor isnot critical as long as the intersection of the cross-hairs lieswithin the visual boundary of the icon to be selected.

NOTE: MIDAS uses only the lower button of the pen forselection.At any point during a CADDS command, the cur-sor may be moved into the MIDAS menu area and newmenu pages can be selected. CADDS is not directly af-fected by changing menu pages.

Keyboard

The keyboard may be used for input at any time whileMIDAS is activated.

Cancelling a Typed Entry. AQ

To cancel or abort a command which has been typed ontothe command line, or is waiting for input from the user,type:

-[CTRL] Q

NOTE: You will notice that all icons have an embeddedAQ at their star. If a command is waiting for input when asecond icon is pressed, the first command will be can-celled and the second command output to CADDS. Thisensures that the second command is not stacked on top ofthe first which would cause an error.

4 GETTING STARTED

INPUT OPERATION!

Cancelling a Routine - ESC Q

MIDAS contains several routines in the Assembly verifica-tion section. To halt a routine which has been started,press the escape key followed by Q:

- [ESC] Q

Dynamic Variables

In some instances, MIDAS will pause during the executionof a command and wait for input from the operator. This isknown as a dynamic menu variable, or "DMVAR". Theuser is prompted with the special character ---> which indi-cates that input is requested from the keyboard or tabletonly. The MIDAS menus cannot be used as input to aDMVAR. The command continues when the user enters acarriage return (CR), signifying the end of the input.

Tablet Menus

Like the keyboard, the tablet menu may be active whileMIDAS is active. Existing keyfiles can be used as inputduring any menu operation.

Status Text and Dynamic Menus

When activated, MIDAS requires that the status text be ac-tive. This means the status text switch on the ICU boxmust be turned on at all times. If desired, the status textmay be turned off through the use of the environmentpulldown in the topmost menu.

MIDAS utilizes the same support system as the regularCADDS dynamic menus. Hence, only one menu systemcan be active at any one time. If there is a need to activatean existing dynamic menu while MIDAS is active, simplydeactivate MIDAS and use the dynamic menu as usual.

GETTING STARTED 5

USING THE MDAS MEUS

USING THE MIDAS MENUS

MIDAS utilizes two besic types of menus md three typesof icons.

Stacked Menus and Panel Menus

Most of the MIDAS commands are contained in Stackedmenus. Stacked menus me distinguished by the tabs thatwpear at the top of the menu. Menu tabs we selectle.When two or mome tabs ae displayed at the top of a menu,you may backtrack to a previous menu by selecting thedesired tab.

At the top and bottom of the screen you will find menus ofa slightly different type known as panel menus. Panelmenus behave much the same way as a stacked menu, ex-cept that no tabs ae displayed.

TYPes of IconsStandard Icon - immediate execution of a command.

S Bent corner Icon - these icons contain a folded lowerright comer and provide access to another menu.

Puildown Icon - these icons contain a small arrow in thelower right corner. The arrow indicates that more selec-tions will appear immediately below the icon whenselected. These additional selections are known as apulldown option list.

6 GETTING STARTED

DEFINITIONS

BASICS OF MIDAS

DEFINITIONS

Hardpoint - A critical junction in a mooring which indi-cates a potential discontinuity in catenary shape, oftencaused by a buoy, ground ring, sinker or anchor.

Assemblies - The two dimensional assemblage ofhardware such as buoys, links, chains and ground ringswhich connect two hardpoints.

Assembly Table - A table containing pertinent geometric,connectivity, and material data for all of the assemblies inthe model.

Model - A group of lines or splines which connect themodel's hadpoints to represent the three dimensionalmodel of the mooring. The model can be used to showeither the user-specified mooring geometry, or the actualmooring shape as computed from the 2D assemblies. Themodel is not required to build assemblies.

Figure -Used in CADDS to group individual geometricentities such as lines and arcs into identifiable com-ponents. MIDAS uses Extended Nodal Figures to repre.sent the library of hardware components. Extended NodalFigures can be inserted and manipulated as a group, butallow each entity within the group to be edited individual-ly to facilitate detail changes after insertion onto the as-sembly.

BASICS OF MIDAS 7

MIAS SUBSYSTEMS OVERVIEW

MIDAS SUBSYSTEMS OVERVIEW

MIDAS consists of four interdependent systems, themenus, the assemblies the model, and the componentlibrary. To give you a feel for how they relate to oneanother, a brief description of each is provided below.

The MIDAS Menu System

The iconic menus are designed to assist the averageCADDS user. The complexity of CADDS is reduced byembedding much of the required CADDS syntax into themenus in much the same manner as a tablet keyfile. Infact, the ionic menus work well as a on-screen supple-ment to tablet keyfiles.

In addition to providing easy access to a wide range ofCADDS capabilities the iconic menus are the essentiallink between the three dimensional mooring model and thetwo dimensional assemblies. Assemblies are organized ac-cording to hardpoint name and layer. The menus managethe layer information so that each assembly component isinserted on the proper layer. As long as the names andlayers are consistent, the system can be assured of associat-ing the right assembly with the right hardpoints.

The MIDAS menus are designed to streamline the varioustasks involved in producing a finished assembly drawing.The chapters of this manual are also designed to cor-respond to these tasks, hence, each chapter is headed by apicture of the appropriate menu and a description of theicons contained in the menu.

The Mooring Assemblies

An assembly is defined as the linear collection ofhardware which connects two (and only two) hardpoints.A riser assembly would typically be made up of a buoy, aswivel, shots of chain, connecting links and a ground ring.There can be no hardpoints within an assembly.

Within MIDAS, an assembly is a collection of two-dimen-sional extended nodal figures which are assembled on acommon layer. By convention, each component figure is

8 BASICS OF MIDAS


assembled starting from a hardpoint near the surface to ahardpoint near the sea floor until the assembly is complete.Assembly verification, such as breaking strength and totalweight, is performed on all the connected figures found ona pricular layer.

The Mooring Mode

A mooring model is made up of several assemblies con-nected together at specific geometric locations known ashardpoints. A mooring model contains several intercon-nected assemblies such as risers and legs. The end pointsof each assembly, such as buoys, ground rings, sinkers andanchors are all located at hardpoints.

The location of each hardpoint, along with the length andweight of each mooring assembly must first be determinedfrom mooring design calculations based on surface condi-tions at the buoy, depth of the water, size of the vessel, etc.This information is entered manually into an assemblytable contained within each mooring drawing. MIDAS canbuild a three dimensional wireframe model of the mooringusing the tabulated data. A line or spline will be drawn be-tween each hardpoint corresponding to an individual as-sembly. This preliminary model represents the "optimal"geometry of the mooring.

The goal is to assemble actual library components into as-semblies which approximate this optimal geometry. As-semblies are built up and verified to determine theirlengths and weight using MIDAS. When these "actual"values are sufficiently close to the optimal values, MIDAScan be used replace the original assembly table entries forlength and weight with the calculated "actual" values. Theassembly is then "hung" onto the original hardpoint loca-tions and rudimentary catenary shapes are calculated byMIDAS. Catenaies which differ significantly from the op-timal shapes should be reviewed.

The "actual" model serves as an accurate three dimen-sional representation of the mooring as it will be installed.This model can be used to generate geometric locationdata needed for additional analysis such as finite elementmodeling.

' BASICS OF MIDAS 9


The MIDAS Library

Each hardware component used to assemble GEMS fleetmoorings is available from the MIDAS figure library.These components ae stored as draw mode extendednodal figures, combining the convenience of figure han-dling, with the ability to edit the individual lines and acscontained within the figure. Each figure has two or morconnection points corresponding to the point at which theycontact mating pieces of hardware. Each figure has aCADDS connect node at each connection point for place-ment puposes

The origin of each figure is located at the connection pointwhich is located nearest the sea surface when assembled.Many components do not have an implicit direction, andtherefore can be placed with their origin at either end.Each new figure is inserte at the connect node of the pre-vious figure.

To make this work, a convention has been establishedsuch that all assemblies shall be assembled starting fromthe component nearest the sea surface and workingdownward. For example, the rst component of a riser as-sembly is the buoy. Chains and connecting links are addeduntil the ground ring is reached.

In addition to the graphic figure, each component has a listof attributes which fully describe it. These attributesspecify purchasing requirements such as vendor and cost,shipping requirements such as weight and volume, andphysical characteristics such as breaking load, and wetweight, length and connection dimensions. The attributesare located in a central file which contains all of the at-tributes for all the components in the library. This file isknown as the "Description File" and is accessed by theMIDAS software during the verification of the completedassemblies.

10 BASICS OF MIDAS

MIfDAS SUBSYSTEMS OVER VEI

j (Blank Page)

1 BASICS OF MIDAS


THE MAIN MENU

Once MIDAS ia activated, the MIDAS Main Menu will ap-pear on the right side of your screen.

On the Main Menu, you will f'md icons to perform the fol-

lowing functions:

" On-line Help for the MIDAS Menus

" Accessing MIDAS parts and drawings

* Access to the 2D Mooring Assembly menus.

" Access to Assembly Verification menus.

" Access to the Sketch Menu.

" Easy deletion of existing B.O.M. text

* Pushbutton creation of Bill of Materials.

" Access to the Mooring Model menus.

" Access to a Drawing Menu

" Access to a Plotting Menu

" Exit MIDAS.

12 THE MAIN MENU

M[DAS SUBSYSTEMS OVERVIEW

HELP- TIDRSMENUS

CALC 'MOORING PARTS

I~IIRCTm

t20 ASSEMBLY

VERIFYASSEMBLIES

30 MOORING~~MDEL 0

CREATE BILLOF MRTERIAL

SHEET A-SIZE

NOTES QUITETC MIDAS

Main Menu

1-E MAIN MErNU 13

THE ASSEMBLY MENU

THE 2D MOORING ASSEMBLIES

An assembly is defined as the linear collection of mooringhardware which connects two hardpoints. Each mooringhas two primary types of assemblies;

" riers, and

* legs.

THE ASSEMBLY MENU

When you enter the assembly component menu, you willsee the menu at the righL The picture presents the variouscombinations possible for a single leg of a mooring as-sembly. Up to six legs containing any combination of as-semblies can be easily handled by MIDAS.

Selections are made by pointing to the desired assembly inthe "Superlcon" picture and selecting with the cursor. Apulldown menu will appear containing the choices for thatassembly. Once you have made your selection, MIDASwill shift you to the Component Selection menus.

If you are not building a standard assembly, or are build-ing an assembly that is not oriented horizontally or verti-cally on the drawing, select the "Custom Assembly" iconat the bottom of the menu. It will ask you for the layer andangle to be used for this assembly. Be sure to keep thelayering consistent with that listed in the Assembly Tableas discussed in the chapter entitled Mooring Model.

14 THE 2D MOORING ASSEMBLIES

THE ASSEMB3LY MENU

2D RSSEfIBLYCONSTRUCTION

SELECT KTHRqSSEtIBL Y j

FRONi i~GRRPHICSBELON

oRNC 1-

{ CU STOM1 RSSY

Asmembly Menu

THE 2D MOORING ASSEMBLIES 15

THE COMPONENT INVENTORY MEN

THE COMPONENT INVENTORY MENU

Once you have selected an assembly from the AssemblyMeu, you we rudy to insm MIDAS components. ThComponent Inventory Men= shows all of the componentcategories available. This menu also contains a "Save As-sembly" icon used for saving or restoring any assembly.(Drawing dentils ae available from the "Drawing Aids"menu.)

The first component of the assembly will usually be a con-necting link in the case of legs and sinker, and a buoy inthe case of the riser. Select the appropriate compnentcategory and the Component Selection Menus will appear.

Saving Assemblies

Assemblies are a linear collection of extended nodalfigures on a given layer. They are saved by constructing apart containing the components of interesL The "SAVEASSEMBLY" icon will construct a part and ask for anorigin for the new part. Digitize the origin of the firstfigure of the assembly. (It will be necessary to implementa standardized naming convention which indicates howeach assembly is unique.) These newly saved assembliescan be reinserted into the same part or another part byusing the "RESTORE ASSEMBLY" icon.

NOTE: To avoid overlapping existing work, be sure toselect a new layer and note the orientation. Horizontal as-semblies will be inserted to the right of the digitize, verti-cal assemblies will be inserted below the digitize.


THE COMPONENT INeORY MENU

CHRIN

ETC.

RNCHR BUOY

LINK CLUMP

(5z)SWIVEL SHKL

WIRE MISC.FTNGS

SRVE RSSYl

W I N : - I $- -

Component inventory Menu

TM 2D MOORING ASSEMBMS 17

COMPONENT SELECTION MENUS


Within each component caegory, thre are several com-ponents available for selection. Select the appropriate sizeand the component of choice, then digitize a location inthe drawing.

Component Size

On many Component Selection pages, you will find a"Size" icon. Select the size of the components you areusing (2". 2.25", etc.). This will set the variable SIZE tothis value. All subsequent component selections will be ofthe same size until the size is reset. This speeds up the in-sertion of matched components.

NOTE: All figure insertion commands are automaticallypreceded by a CNODE mask in GETDATA to ensure ac-curate positioning with respect to the previous figure.When inserting the first figure of an assembly, select theLOC icon from the bottom menu to ovemide the CNODEmask because you will be placing it at an arbitrary locationon the drawing. If the terminal beeps when insertingfigures, select the REPAINT icon on the bottom menu tomake sure that the appropriate layers are visible.

NOTE: CNODES and NFIGS are represented by adiamond and a bulls-eye symbol respectively. These sym-bols MUST be visible for MIDAS to work correctly. Forbetter visualization, however, they may be turned off tem-porarily. A small dot will remain.

Layers

Each assembly in MIDAS must be placed on a uniquelayer for the verification routines to work properly. Nor-mally, the menu system will handle the layering for you. Ifyou are building a non-conventional assembly which hasnot been assigned a standard layer, place all componentsof the assembly on the same layer by selecting the layerbefore inserting the components.

18 THE 21) MOORING ASSEMBLIES

COMPONE N SELECTION MENUS

SELECT SIZE

2.50 2.75 ETC.

CHRIN ClITONL LINK

CHFIN JOINING LINK

RNCHOR JOINING LINK

ODD LENGTH CHAIN

ASSIGN CHRNGE UPDATELENGTH ,,' PROP

ECHO SYMBOL SKETCH

ON OFF

TYPical Compouent Selection Menu

THE 2D MOORING ASSEMBLJS 19


When verifying this assembly (See section Verifying As-semblies), select the "Custom Assembly" icon at the bot-tom of the menu and select a layer number for the assemb-ly. This will automatically set the layer variable to thedesired layer. Since this is a normal VARPRO variable&LAY, it can be redefined at any time. For example, toenable the verification routines to check the componentson layer 16, type:

LET &LAY=16 <CR>

NOTE: All CADDS variables, known as VARPRO vari-ables, are preceded by "&" in CADDS naming conven-tions.

Odd Length Chain

MIDAS provides for inserting odd chain lengths otherthan 90'. Because these lengths are not known prior to in-sertion, the chain is inserted and changed to reflect thedesired length. There are icons provided for this purpose.

1) Select the icon labelled "Assign Length" and type in thedesired value at the ---> prompt, then select the chainfigure origin. This will update a property of the figure tothis new value.

2) Select the icon "Change ##" and type in the new lengthand select the dimension teXt. Use this same procedure tochange the find number text in the bubble to the correctnumber. This will not affect the Bill of Materials,however, so be sure to edit the resulting B.O.M. text toreflect this change.

3) You must update the property for the text in the dimen-sion and the bubble after you change them. To do this,select the icon "Update Prop" and select the two text en-tities.

4) A negative value has been entered in the description filefor odd lengths indicating lbs/ft, hence the weight will becomputed correctly by using the value assigned in Step 1.



"Hidden-Line-Removal"

Successive components are selected and placed into thedrawing by digitizing the trailing CNODE of the pre-viously inserted figure. To make the "hidden line removal"work, each figure has been designed to "mate" with theother figures. A problem sometimes arises when mixingand matching odd components such as connecting linksand ground rings or anchors. If the figures don't appear tomatch, try a different view of the link. If it still doesn'twork out, trim the offending entities to suit. If its a com-mon problem, it may be worthwhile to convince yourmanager to create a custom figure.

Assemblies at Odd Angles

A key feature of the MIDAS system is the ability to insertfigures at any angle on the drawing. The same figure canbe used for horizontal legs, vertical risers and sinkers, andassemblies built at any angle in between. In the case oflegs and risers, the angle is automatically set to reflect thenormal presentation.

If a new angle is required, specify the desired angle asmeasured from horizontal. The angle is maintained as theVARPRO variable &ANG, so this can be reassigned atany time. For example, to set the angle to 30 degrees, type:

* LET &ANG=30

Scaled Assemblies

MIDAS is designed such that all figures are inserted at fullscale. This ensures that the bubbles and dimensions willconform to drafting standards. If it is necessary to changethe scale of an assembly, you will have to change the bub-ble and dimensions graphics or insert new ones. A stand-ard bubble figure is provided to help this situation.

Assemblies That Don't Fit

Assemblies which must be broken into two or morseparate segments to fit on a drawing, or exist on separatedrawings within a "super-rawing" can still be assembled.3 When you have run out of room to attach additional corn-

THE 2D MOORING ASSEMBLIES 21


ponents direcdy, continue at another location on the draw-ing, using the LOC con in GETDATA for the first com.ponent in die continuation.

To verify this boken" asembly as a single assembly(See section on Verifying Assemblies), locate the "NodalLine" icon in the vericaton menus to insert a nodal linebetween the las connect node of the previous assemblysegment and the first connect node of the continuing seg-ment of the assembly. The code will automatically tracealong the nodal line to find die rest of the figures.

Movint Assemblies

Once components have been inserted onto the appropriatelayer, the figures can be translatd, rotated or deleted justike any other CADDS figure. The Sketch Menu isprovided for this purpose.

NOTE: To translate a whole figure, you must use theNFIG modifier in GETDATA, otherwise, only the in-dividual entities will be moved. At the time of this writing,the CADDS dimensions used to define the bubble text can-not be copied when using the TRANSLATE commandwith the COPY modifier. To create new assemblies fromexisting assemblies, use the SAVE ASSEMBLY and RE-STORE ASSEMBLY icons as described in the sectionSAVING ASSEMBLIES.


COMPONENT SELECTION mMS

USNAVY PROPR

SampleSE MIDAS 6um

THE D MORIN ASSMBLIS22

ASSEMBLY VERIFICATION MENU

VERIFYING ASSEMBLIES


Verifying By Assembly Nam

The assembly verification menu page uses the same moor-ing "supericon" to select die assembly for verification.Select the apprpriate assembly from the menu pulldowns.MIDAS will set the layer to tha of the selected assembly.

Next, select the icon "Verify Assembly - Print Only" toverify all figures found on that layer. If figures ae foundon the same layer, but are not connected to the indicatedassembly, a warning will be issued. The results will beretained regardless to allow for incremental checks of in-complete or partially exploded assemblies.

Updating the Assembly Table

If you have built an assembly table for this mooring, theMIDAS will update the entries for length and weightbased on the results of the verification. If you wish to up-date the table, select the icon "Verify Assembly and Up-date Table".

Verifying By Assembly Layer

If the name of the assembly is not available, select the icon"Assy - Select Ent" and select one of the figures in thedesired assembly. The system will check all figures foundon the same layer as the selected figure.

Point-to-Point Verification

When verifying only a portion of an assembly, select theicon "Select By Window, Point-to-Point". You will beasked to select the components of interesL Only thosefigures selected will be verified.

24 VERIFYING ASSEMBLIES

ASSEMBLY VERIFCATION MENU

=HFNSER

T SELECT

RENT

ONLY TRB LE

L_

PT-O-TPRINT ONLY

Assembly Verifcation Menu

VR~IFYIiNGIASSEMBLIESI2


NOTE: If the components selected contain a branch suchas a ground ring. spider plate or equalizer, the verificationroutine will output correct values for weight and breakingstrength, and will perform a proper fit check but will out-put a length that is equal to the sum of ALL components.This will NOT be a valid length for the assemblies andshould NOT be used to dimension the assembly.

NOTE : Due to the incorrect length value, it is not pos-sible to update the Assembly Table based on a Point-to-Point verification. Update applies to single, complete as-semblies only.

Dimensioning An Assembly

The CADDS system uses actual coordinates to drive itsdimensioning system. The shots of chain inserted in theMIDAS assemblies are only a few inches long, however,not 90 feet. Hence, we have to lie to the dimensioning sys-tem. This is accomplished by first verifying the assembly,or section of assembly that you wish to dimension. Thiswill calculate the cumulative length of the figures selectedand assign this value to a preset VARPRO variable&LENGTH.

Using the "Dimension" icon in the menus and selectingeither orientation, digitize the origin of the first figure, theconnect node of the last figure and the desired location ofthe dimension text. The system will read the dimensionvariable &LENGTH and display this value in the maintext of the dimension.

NOTE: The dimension text will always reflect the lengthof the LAST assembly verifed. Be sure to verify each as-sembly or portion of assembly immediately prior to dimen-sioning iL

Length and Weight

Once an assembly has been verified, MIDAS will pint outits characteristics to the screen. The critical characteristicsof length and weight cam be optionally updated into the as-sembly table when desired so that the next time a catary

26 VERIFYING ASSEMBLIES

RELATIONSHIP TO THE MODEL

is run, the model will reflect the new "actual" assembly

geometries. Those assemblies which have not beenverified will retain their original u-designed values.

Attachment Check

All assemblies are checked for attachment compatibilitybetween each mooring components. This check comparesthe nominal opening of one component with the nominalsection of the adjacent componenL These attachmentdimensions are found in the component Description Filedescribed later.

Some components such as anchor connecting links aredesigned to connect small diameter chain with largerdiameter shackles or ground rings. To eliminate the needto align these components individually in the assemblydrawing, MIDAS automatically checks both ends of thesecomponents to determine fiL If the component will fit if as-sembled in the other direction, MIDAS will OK the con-nection.

NOTE: Any failure in the attachment check will cause theprogram to halt and an error message will be printe&

Components which fail the attachment check will be high-lighted in red. The commane. MARK ENT CLEAR ALLis provided in the MIDAS menus to remove this highlight.

RELATIONSHIP TO THE MODEL

Using MIDAS, you can build perfectly valid assemblies,create assembly drawings and parts lists, and compute thelength, strengths and overall weight of the assemblieswithout first having built a three dimensional model of themooring. This ensures that nearly all of the features ofMIDAS are useful in the absence of three-dimensionalmodel information.

If the Assembly Table has been filled out with all relevantmooring data, MIDAS can update the table values forlength and weight for each assembly. This provides a truelink between the 2D assemblies and the 3D model.

I

VERIFYING ASSEMBLIES 27

• L nmna n i nnin ....

THE SKETCH MENU

THE MIDAS DRAWING

THE SKETCH MENU

The Sketch menu contains many of the commands neededfor edting the compoent goomees, trimming, moving,rotating, and mhnring entities. Icons are available for in-sering lines, arcs, circles, lext and nodal teX A selectionof GETDATA masks am prented, as re icons for edit-ing text, changing layers and displaying drawing images.

A Select Dynamics icon is available which will allow fordynamic rpositioning of entities such as bubble text.When using the dynamics, select the icon for "TranslateEnt". then select the entities to be moved and finish yourselection with a semi-colon. When the graphics turn green,use the top button on the stylus to move te entities. Dropthe group by selecting a location with the bottom buttonon the stylus.

NOTE: Always turn dynamics off when you are finishedtranslating. Dynamics will confuse almost every Otheroperation if left activated.

28 THE MIDAS DRAWING

THE SKETCH MENU

ZToJROTRFE0

E . CPY4

ENT COPY j

T1 ENT OY

(LNGTH INTOFJ

W WIN NERR

Tj END LOCR

ORG A CHAIN

NORMAL NODAL EDIT

TEXTAPPLY SELECT CHANGE

Ei ECHO ALL

SELECT OTHER

GRIDS DIVID2ON

,, IDYNI GIDI STRCHI

The Sketch Menu

U THE MID)AS DRAWING 29

THE COMPONENT FIGURES

THE COMPONENT FIGURES

MIDAS derives much of its power from the use of intel-ligent component library figures. Each component used inMIDAS is a drawing mode extended nodal figure (If youare unfamiliar with nodal figures, it might be helpful toreview the CADDS figure reference manual.)

Figures are a useful method of grouping CADDS graphicentities into an effective library par. MIDAS utilizes draw-ing mode extended nodal figures to take advantage of thefollowing traits:

" Ability to identify and move the complete figureafter insertion.

" Ability to edit (trim, delete, etc.) individualentities contained within the figure after insertion.

* Ability to carry nodal information, in this caseconnect nodes.

" Ability to construct a part containing severalfigures without loss of data.

" Ability to automatically generate a bill of materialfrom the drawing. This bill of material is keyed tothe "find number" of each component which is aproperty of each figure.

Most commonly used mooring components have been in-cluded in the MIDAS library, hence you will not be re-quired to build new figures. When a new figure is re-quired, refer to Appendix A entitled "Figure Building".


THE FIGURE GRAPHICS

TTH FIGURE GRAPHICS

Most MIDAS components are built so that they are in-serted at full scale. Relative dimensions from the com-ponents are used to develop the individual figure profiles,but all MIDAS drawings should be considered NOT TOSCALE.

Mating Components

Since all the parts must mate with the other components ofa given assembly to effect the "hidden line removed" ap-pearance, a standard gap opening and mating section havebeen used. This allows a single connecting link figure tomate with different size chain figures. The assemblyverification routines will find any assembly interferenceproblems.

THE MIDAS DRAWING 31

PLOTMIG THE DRAWING

PLOTTING THE DRAWING

A Plot menu is provided in MIDAS which wil make plot-ting the drawing easie. It is assumed that the drawing willbe plotted on a 36 inch Versatec electrostatic ploter. Iconsare provided for the following functions:

" Echo the 3D model On or Off

* Echo the Assembly Table On or Off" Echo the TNODE, CNODE, anVPFG symbols

On orOff" Find all dimensions and bubbles and change them

to layer 220. This will cau them to behighlighted in red. Use the Cler" icon to clerthis highlight.

* Echo dimensions and bubbles On or Off

" Echo the drawing form On or Off

" Echo layers and change entities to a different layer

* Plot the drawing at full scale, assigning a width of4 to the component geometries. The drawing willbe rotated on the plotter to fit.

* Plot a windowed section of the drawing.


PLOTING THE DRAWING

ON ONMODEL TRBLE] SYtBLOJ OF LOFFjFIND O N ONBUBS/DIMS FORMCLERR OFF OFF

ECHO RLLLRYERS.

CHANG VERFY

PLOT DOT ']

PLOT DOT WIN

The Plot Menu


DRAWING TOOLS MENU

DRAWING TOOLS MENU

A drawing tools sampler menu is included which containstypical drawing components useful for the fast creation ofMIDAS drawings. Available from the menu are:

" Standard Find Number bubbles

* Additional BOM Table line graphics

" Access to the Sketch Menu

* Section arrows

" Dimensions

" Drawing text in two typical sizes

" Access to Drawing Detail Figures

" Access to Drawing Notes (If available)

" Turn Draw form On/Off

" Turn Component symbols On/Off


DRAWING TOOLS MENU

95 LBOM SKETCHILINESI

ARROWS ''IMS'

DRAWINGNOT ES

DRAWINGDETAILS

DRAW FORM'

ON OFF

FIG SYM1BOL'

ON OFF

Drawing Tools Menu


FIND NUMBER BUBBLES

FIND NUMBER BUBBLES

Moving/Rotating a Bubble

In most caes when a figure is inserted, the bubble will fallin line with the rest of the figure bubbles and there will beno need to move it. If, however, the bubble interferes withanother bubble, simply move or rotate the bubble, alongwith its leader and arrowhead, to a new position.

To change the position of a bubble, rotate the bubble, theleader line and the arrowhead about the tip of the arrow toa new position. The text will remain horizontal. You mayalso stretch the bubble and its leader to a new location,then rotate the arrowhead to reflect the new position.

NOTE: The text within a bubble is non-associated drawmode dimension text. Occasionally, when you trnslateand rotate a figure, the text may drift slightly away from~the center of the bubble. To correct this, nrnslate the bub-

1 ble text to the new position.

Bill of Materials

An accurate Bill of Materials can be generated from the as-semblies in a given drawing. All of the components in thedrawing, including any that might be located on layers thatare not currently echoed on will be counted. To create aBOM table on the drawing, press the BOM icon and select"Simple" on the pulldown. This will place drawing modetext entities at the location of the TNODE located in theBOM table area. If for any reason the routine is unable tofind the TNODE, you may need to rename the TNODE bytyping.

* TAG ENT ENT BOM: TNODE (select the TNODE)

If an assembly in the drawing is typical (TYP) of other as-semblies not inserted in the drawing, as is often the casewith leg assemblies, select one of the other choices in theBOM pulldown. The MIDAS BOM routine will allow upto three separate assemblies to be duplicated (TYP), andany number of duplicates to be counted.


FIND NUMBER BUBBLES

Each figure hs the property STOCKNO which representsthe stock number of the component and matches the findnumber within te bubble. It is also the first field in thecomponent description fde. This number is a unique iden-

tifier which is referencod by the Bill of Materials packageand shoud not be change Th format of the stock nun-ber (AB#) is broken down as follows:

A = Component Category

B = Component Type

# = Component Size

THE MhDAS DRAWING 37~1

THE ASSEMBLY TABLE MENU

THE MOORING MODEL

MIDAS provides a link between the real world of buildingassemblies from Available components and the ideal worldof the engineering analysis. This link is represented by atable that is present in each mooring part called the As-sembly Table.

The Assembly Table Graphics

The assembly table is on layers 200-201 of the drawingand consists of 64 lines of text, each containing II textnodes and associated nodal text Each text node is as-signed a different property, according to its position in thetable. The associated text is read by MIDAS and is used tobuild the three dimensional model.

Each line in the table is an independent figure and can betranslated like any other figure. Unless it is absolutelynecessary, however, it is not recommended that the As-sembly Table be rearranged.


When you select the mooring model icon on the mainmenu, you will see the Assembly Table Menu at the right.

The icons contained within this menu are designed to helpyou edit the Assembly Table. Access to a secondary menucontaining all the standard table entries is provided byselecting the "Tables Entries" icon.

Viewing the table is made easier if you use the iconslabelled "Table Top", Table Mid", and Table Bot". Thesethree images should give you access to all the table entries.If the table is not visible, select the icon "Table On"

Pressing the "Build Model" icon will build a 3D model tothe dimensions set forth in the Assembly Table.

NOTE: Do not delete any table figure or text representingan assembly in the table. An assembly can be "turned off"by simply replacing the Location Key text with a dash (-).

38 THE MOORING MODEL


ASSY TABLEJ

TETXT LINES TRBLE

EELETE MOVE TOP

NEN COPY M110

BOTMl

[C HRNGE TEXT eRPPLY]

EDT EXT

XYD RRD

ON HELP M1DLTRBL E 110DEOFF DRAW

BUILD MODEL)

VIEW MlODEL

Assembly Table Men

THE MOORING MODEL 39

READING THE TABLE

READING THE TABLE

Each entry in the table represents an assembly and isdescribed below.

NAME : The current assembly name is contained in thefirst entry in the table. The names included in the standardtable are used throughout the menu system to keep track oflayering conventions. If possible, stick with these namesand layering conventions.

FROM : The second entry is the name of the assemblywhose end location serves as the starting point for the cur-rent assembly.

SYMBOL: A reference to the graphic symbol used to rep.resent the termination of an assembly in the model. Theavailable symbols ar

" RING represented by the symbol

" SINK represented by the symbol

" ANCH represented by the symbol

" MISC represented by the symbol

For example, an assembly which terminates in a groundring will include the text RING in the symbol column.

LAYER: The layer on which the current assembly will beplaced.

KEY: The Location Key represents the coordinate systemused to position the end of the assembly. XYD (X,Y anddepth), and RAD (Radius, Angle and Depth) are the twosystems recognized by MIDAS. A dash (-) in this field in-dicates that the assembly is not to be included in the model.

X, Radius, Y, Angle and Depth : Measured in units offeet except Angle which is measured in degrees clockwisefrom North (top of drawing). Depth is entered as a nega-tive value.

REF : The Reference field is included to allow locating anassembly relative to any other assembly or hardpoint in de


READING THE TABLE

model. In the current version of MIDAS, ANGLE remainsrelative to North even if measured relative to another as-sembly. This can be changed if found to be inconvenient.

LENGTH: The true catenary length of an assembly,measured in feet A dash in this field indicates that alength is not known or that the assembly is to be ap-proximated in the model by a straight line. Length can beupdated with the true length of the assembled componentsas calculated by the verification code if desired.

WEIGHT: Overall wet weight of an assembly measuredin the units of pounds (Ibs). A dash in this field indicatesthat a weight is not known. This value can also be updatedwith the true combined wet weights of the components ifdesired.

Catenary Curves

MIDAS provides the capability to create smooth catenarycurves representing the various assemblies in the model.Catenaries will be computed for all those assemblieswhich have a number entered in the length column in theAssembly Table. If the length column contains a dash (-),the assembly will be approximated by a line.

These catenaries are for display and plotting purposes.

A characteristic of an assembly is that it has a smoothcatenary slope along its length. Since hardpoints have beendefined as discontinuities in the slope of a catenary, it fol-lows that an assembly cannc-. contain any hardpoints ex-cept at the extreme ends. If the catenary contacts the seafloor, a straight line will be inserted between the point ofcontact and the next hardpoint, usually the anchor.

NOTE: The catenaries generated will be a good ap-proximation for legs whose slope is less than 1/3 (rise isless than 1/3 of the run). Legs whose slope is greater than1/3 will not produce accurate catenaries, hence should con-tain a dash (-) in the length column in the Assembly Table.These will be represented as straight lines and will appearred until the command "Mark Ent Clear All" is entered.

THE MOORING MODEL 41I

EDITING THE TABLE

EDITING THE TABLE

A Table Entries menu is provided in MIDAS expressly forediting the Assembly Table. The mooring "supericon" isagain available which conains all of the names for thestandard assembly nans u well as the ti key locationentries XYD, RAD and dash (-). Select one of thesechoices and point to the table entry you wish changed.MIDAS will replace the text you point to in the table withthe text you have selected from the menus. The command"CHANGE TEXT" is used for entering numerical locationdata.

NOTE: All entries in the table must be in upper case only.

Once the table has been edited to your satisfaction, a threedimensional model can be built which reflects the data inthe table. The assembly model, though actually measuredin units of feet, is built in model units of inches. TheCADDS command MEASURE LENGTH will give youthe accurate number of units (feet) in each straight sectionof the moorng model. A catenary calculation will also berun which replaces the straight lines with catenary curvesif actual assembly lengths and weights have been enteredin the table. Catenary length will be approximately .94 oftheir true length. This 6% difference is caused by the curveapproximation algorithm.

The model is built in three dimensions and is viewed in aCADDS view, just like any other CADDS modeL If themodel does not fit the predefined view, an icon is providedfor standard CADDS viewing commands such as ZOOMVIEW OUT or IN.


EDITING THE TABLE

TRBLE ENTRIES

HANGE TEXT RPPLY

XYD RRD -

o HELP

0N

o-)"r f RNC2]

(USE ONL Y THE POINTSNEEDED FOR LEG)

Table Enatres Menu

THE MOORING MODEL 43

USING THE MODEL FOR CAE


The model is an accurate representation of the mooringgeometry as reflected in the assembly table. If the as-semblies have been verified and the table updated, thelengths and weights indicated in the table will be an ac-curate reflection of the "actual" values. The table valuescan be output to a text file for use in subsequent mooringanalysis. (Press the right half of the arrow shape in theModel menu.)

The three-dimensional model is useful primarily as inputto subsequent mooring analysis, and as mentioned pre-viously, can represent either the user specified model data,or can be updated after the two-dimensional assemblieshave been built to reflect the "actual" assembly data. Sincethe analysis is only as accurate as the input data, MIDAScan automatically update the model data with the preciselength and weight of each assembly as generated by theverification routines.

NOTE: It should be remembered that MIDAS does notreposition hardpoints automatically. All hardpoints loca-tions are entered manually in the Assembly Table, henceshould be checked carefully.


SnpMKDAS Model

TEMOOMING MODEL 4


APPENDIX A - TROUBLE SHOOTING

The following circumstances may occur while usingMIDAS.

Menus Disappear

Certain CADDS commands will cause the CII menus tovanish. They will reappear again after typing.

* REFRESH or REPAINT <CR>

Menus Graphics Are Overwritten

CADDS commands such as ECHO GRID ON will causethe grid graphics to overwrite the on-screen menugraphics. The menus can still be used, and a REFRESH orREPAINT will clear them up.

Can't Activate Dynamic Menus

CII and the conventional CADDS dynamic menus utilizethe same hardware support, hence only one can be used atany one time. If you need to use a dynamic menu while inCII, simply type DEACTIVATE CII and activate yourdynamic menu.

CII Keypad Doesn't work

A special function called a DMVAR is used occasionallyto accept input from the operator. This will be signified bythe symbol --> at the end of the command text. Input mustbe from either the keyboard or tablet menu, it will notrecognize input from the Cli menus. A carriage return sig-nals the end of a DMVAR input, and a [CTRLI Q willreturn you to the CADDS prompt.

Menu Tabs Overlap Top Menu

Occasionally, four or more tabs will appear on the stackedmenus and interfere with the upper panel menu. There isno damage caused by the overlap, but since the tabs havepriority over the upper menu, select any upper level tab toclear the overlap.

46 APPENDIX A - TROUBLE SHOOTING


Menus Do Not Respond

Push the ROTATE button on the ICU to make sure it isnot set to a hardware zoom or scroll. (You can use thishardware zoom function to enlarge your menus, but theywill not operate in miy but the normal settings.)

If the menus still do not respond, check to see that the cur-sor turns blue when you select a menu icon. If not, there isa good chance that your system manager has loaded a newversion of CADDS without reloading the latest revision ofMIDAS.

Menus Are Out Of Place

Check the ICU for hardware settings (See above).

CADDS Graphics Hidden After Zoom Draw

The ZOOM WINDOW command is based on the originalfull screen size and is not aware that you are using pan ofthe screen for menus. To avoid this problem, simply giveextra space on the right side of your zoom window to com-pensa.

Menu Text Garbled

On some systems, a different text font has been substitutedfor the original CADDS font. In particular, if font 11 hasbeen changed, you may notice a problem. Call TAG for awork around.

Menus Arcs Appear As Polygons

The original MIDAS menu part extents were extendedbeyond 128. See your system manager or refer to the CHreference manual.

Extra Lines Appear Across the Screen

This will usually be caused by activating a particular menupage. This is caused by a problem in the original MIDASmenu part. See you system manager or refer to the CHreference manual.

APPENDIX A - TROUBLE SHOOTING 47


Menus are Incomplete

Caused by problems in the original MIDAS menu part.See your system manager or refer to the CII manual.

Menu Graphics Do Not Match the Commands

Caused by creating new MIDAS menu commands withoutupdating the graphics. See your system manager or refer tothe CIU manual.

48 APPENDIX A - TROUBLE SHOOTING


APPENDIX B - FIGURE BUILDING

To build a MIDAS figure, follow the steps outlined below.It is expected that the creators of MIDAS figures are ex-perienced CADDS users, hence some detail has beenomitted. Details of description files and connections fol-low.

1) Copy and rename the standard MIDAS figure panCFPOIL.Th.FIGURE to a new name under the catalogCFPOIL.FM.

2) Activate Drawing B.

3) Place a CNODE at the origin (0,0) of the drawing. Thisrepresents the point where the component physically con-tacts a mating component This will typically be locatedwhere the midline of the figure intersects the inside of thecomponent section profile.

INSERT CNODE:

4) Insert the property PDSZE LEFT to this CNODE bytyping:

* INSERT PROP PDSZE 'LEFT': CNODE

NOTE: This CNODE represents the point of contactnearest the sea surface and is usually either the same sizeor larger than the contact nearer the sea floor. If this is notthe case with a particular figure, and the larger connectionis nearer the sea floor, place this property on the secondCNODE instead (See below).

5) Build the figure in model mode using a scale of .4 inch= I foot ( .4" = 1' ). The figure should be built as it wouldnormally appear when connected in an assembly, with thesea surface to the left, the sea floor to the right. All figuresincluding buoys should be built horizontally, as thoughthey were lying flat on a deck, not vertically as they maybe in the final mooring configuration.

All figures use a mating gap and corresponding sectionwidth of .I inch.

APPENDIX B - FIGURE BUILDING 49


6) Place a second CNODE at the point of contact nearerthe sea floor. When complete, check each figure to makesure the "HLR" works in all cases and tweak the positionof the second CNODE if necessary.

7) Insert the property PDSZE RIGHT to this CNODE by

typing.

* INSERT PROP PDSZE 'RIGHT" : CNODE

8) Insert a bubble on the midline of the figure by typing-

, INSERT PART CFPOIL.FM.BUBBLE: NEAR

9) Trim the leader (TRIM ENT INTO:) to where it inter-sects the outermost profile of the figure and translate thetip of the arrow (TRANSLATE ENT:) to this new loca-tion. This will ensure that the bubble remains exactly 2 in-ches from the midline of the figure.

10) Change the bubble text to the correct find number bytyping.

* CHANGE DIMENSION TEXT MAIN 'AB#':

where AB# is the correct find number of the component.

11) Insert a part property with this same find number bytyping:.

* INSERT PPROP STOCKNO 'AB#' <CR>

12) If a dimension is desired, insert the standard "dimen-sion" and edit to suit:

INSERT PART CFPOIL.FM.DIBC

13) Insert the prope.rty DRAWNO on all bubble graphicsand all dimension graphics. This will allow MIDAS toautomatically find all bubbles and dimensions and movethem to a special drawing layer for plotting purposes.Type:

* INSERT PROP DRAWNO:

NOTE: If you need to change the dimension text of thebubble or dimension after you have added the DRAWNOproperty, you must reinsert the DRAWNO property.

CADDS removes the property if the dimension text hasbeen changed.

50 APPENDIX B - FIGURE BUILDING

CONNECTIONS AND CNODES

14) On all branching figures such as ground rings andspider plates, insert the part property IGNORE:

INSERT PPROP IGNORE <CR>

1S) On all figures whose length will be assigned by theuser after insertion, such as variable length chain, assign adefault length by inserting part property BLENGT:

* INSERT PPROP BLENGTH 1 <CR>

16) Once you have completed the graphics and added theproperties, file the part as a drawing mode extended nodalfigure by typing:

EXIT PART F NFIG DRAW B VIEW TOP ALL

17) Add a new entry which fully describes this componentinto the description file by typing:

* EDIT FILE CFPOILFM.DFILE <CR>

Copy an existing component description (contained withinsquare brackets (1), and edit to reflect the current com-ponent.

CONNECTIONS AND CNODES

Most MIDAS components have two connections whichallow it to be joined into an assembly. These connectionsmay be the same size, as in a length of chain, or one maybe larger than the other as in an anchor joining link. Theseconnections are represented in the figure by CNODESplaced at the point of contact. To identify the ends, theproperty PDSZE is added to the CNODES as follows:

* INSERT PROPERTY PDSZE 'LEFT': CNODE

or,

* INSERT PROPERTY PDSZE 'RIGHT': CNODE

By convention, the property PDSZE LEFT is assigned tothe CNODE located at the figure origin and in most caseswill be the larger of the two connections. Some non-revers-ible figures may have the small end at the origin, but thiswould be unusual.

Relationship to Attachment Check

The attachment check will check both connections of re-versible components for fit. Components will be flagged


SPECIAL CASE COMPONENT FIGURES

for fit violations only if they can't be "reversed" to fit (non-reversible), or an intefeence remains even after tryingboth connections.


In a few cases, a figure requires special handling, eitherdue to a unique design trait, or due to a special pupose itserves in the mooring design. Two such caes are notedbelow.

Ground Rings, Spider Plates, Equalizers, Etc.

A certain class of mooring figures are designed to branchfrom one assembly to two or more assemblies. These arecharacterized as having three or more CNODES. A restric-tion is that this type of figure cannot be used as the firstfigure in an assembly. If it is desireable to check the fit oftwo or more assemblies, use Point-to-Point verificationand all selected figures will be checked.

NOTE: Spider plates and equalizers have three conectnodes. These are non-reversible components and have theLEFT CNODE at the origin. Both remaining connectionnodes receive the property BDSZE RIGHT.

NOTE: All figures which have more than two CNODESmust contain the part property IGNORE and can be in-

serted only as the last component in any given assembly.

Variable Length Components

Components whose length is determined by the user, mustcontain the part property BLENGTH (n). This property isthen interactively changed by the user after insertion and isread by the verification code to determine length.

To denote this characteristic in the description file, place anegative one in the length field. If the weight is to deter-mined as a function of length, place a negative value forits weight per unit length (lbsft) in the weight field.



Non-Reversible Components

Most mooring components can be assembled withoutregard to direction. Chain is the obvious example. Othercomponents such as anchors and buoys, have a definitedirection, and cannot be reverse& Certain mooring criteriamay dictate that a component be restricted to a given direc-tion in the mooring assembly. To facilitate this, a field hasbeen reserved in the definition file to indicate this charac-teristic. A YES indicates reversibility, while a NO indi-cates the component is non-reversible.


DESCRIIONFILE

DESCRIPTION FILE

The MIDAS Description File contains a reference to everycomponent in the MIDAS libry. When a verification orB.O.K is performed. the Description File is used as thesource for all information relative to the figures.

Each new component must have its own entry in thedescription file. This file contains all of the relevant dataconcerning this componen. Multiple views of the samecomponent have the same find number and therefore willreference the same description file.

There are eighteen "fields" in the component descriptionfile reserved for each figure. These fields are in sequenceand each consecutive field must be present in the file. Theset of 18 fields denoting a complete component is in turncontained within square brackets [ to distinguish it fromthe next component.

Alphanumeric Data

Fields which contain alphanumeric data (text strings) suchas find numbers must be contained within parentheses. Ifthere is no available information for a particular al-phanumeric field, simply place an empty set of paren-theses to denote the presence of the field. Text strings mayinclude matched sets of parentheses.

In the description field, each line of the description mustbe under 40 charactem so that the Bill of Materials willprint properly. You may include descriptions that areseveral lines long by continuing the description on a newline after the forty character line limit. Be sure to enclosethe entire multi-line description within parentheses.

Numeric Data

Numerical fields are separated by spaces or carriagereturns. If no data exists for a numeric field, enter a 0separated by spaces or carriage returns.


DESCRIPTION FILE

Field Format

There is no limitation on the number of fields per text line,and fields can be continued on the next line. In the Descrip-tion File supplied with MIDAS, each field is placed on itsown line to make the file more legible.

Comments Within the File

All text to the right of a percent sign (%) will be con-sidered a comment and ignored.

Assigned Fields

[ Start of Description1. Find Number - 3 characters max (String)2. Specification - 12 characters max (String)3. Description - 30 char per line, no line limit (String)4. Material (String)5. Left Opening - inches (Numeric)6. Left Section - inches (Numeric)7. Right Opening - inches (Numeric)8. Right Section - inches (Numeric)9. Length - feet (Numeric)Use a negative one (- 1) in this field if the length will be

found from a property on the figure.10. Wet Weight - Pounds (Numeric)Use a negative value for lbs/ft if weight is to be found

as a function of length.11. Breaking Strength - Pounds (Numeric)12. Reversible - YES or NO (String - ALL CAPITALS)13. MIDAS Symbol Name - 3 characters (String - ALLCAPS)14. Vendor - (String)15. Shipping Weight - pounds (Numeric)16. Shipping Volume - cubic feet (Numeric)17. Cost - dollars (Numeric)18. Identification - (String)

E End of Descriptim


SAMPLE DESCRIPTION FILE ENTRY.

SAMPLE DESCRIPTION FILE ENTRY.

I % Start of description

(CS3) % Find Number. 3 char max

(CSHOTI1) % Spec or Part No, 12 char

(Chain, Shot (90 Fee) 1.75 nominal,

Link anodes to be attached as shown) % Description

(Steel) % Material

3.0 % Left Opening, inches

2.25 % Left Section, inches

3.0 % Right Opening, inches

2.25 % Right Section, inches

90 % Length, Feet

4250 % Wet Weight, lbs

570000 % Breaking Strength, lbs

(YES) % Reversible ?

0 % Graphic symbol name

I % End of description

In the above example, only the first thirteen fields wereentered. It is not mandatory to complete all eighteen fields,but all fields used must be consecutive, hence, if it is im-portant to include the information located in the last field,then all fields must be present. Blank text fields are repre-sented by empty parentheses, blank numeric fields by azero.


INSTALLING MIDA!

APPENDIX C - TECHNICAL NOTES

INSTALLING MIDAS

Installing MIDAS is a simple operation. Most of the workis perfonmed by an execute file. All program files requiredfor the MIDAS installation will be loaded from magnetictape into the catalog: CH and DATA.CU. Part files andthe description file will be installed into the catalog:CFPOIL.FM

(1) If MIDAS has previously been loaded on your system,edit the file DATA.VNP and delete the following entriesthat were added by MIDAS:ACTIVATE MIDASACTIVATE GUIDEACTIVATE TESTMENUANALYZE MOORINGDEACTIVATE CIIGENERATE MOORINGkEFRESH 000PUT IDFPUT TABLEINSERT BOM(2) The install file will automatically recompile the VNP.If the system level command MODCOMP is not installedon your system, it can be installed by typing-

SYSCMTB CMTB.MODCOMP <CR>

(3) Again, if MIDAS has been loaded previously, edit thefile DATA.PROP and delete the following properties thatwere added by MIDAS:IDFETYPIDFCELLIDFLAYOUTIDFIMNAMIDFIMOFFTERMTYPEDATANODEPDSZEBLENGTHSTOCKNOIGNORE

LIMB

APPENDIX C - TECHNICAL NOTES 57

INSTALLING MIDAS

(4) Log on under a user name which has a default protec-tion group of 0000. Many systems managers have a higherprotection.

If your prefer, temporarily set your own default protection

group to 0000 to ensure access by all users by typing.

* SETPROT 0000 <CR>

(S) Disable all local directories by typing

DSABDIR <CR>

(6) Mount the tape, attach the tape drive with the coln-mand

* ATTACH MTTAPE <CR>

(7) Copy the files required for installation with the com-mand:

COPY :MT//REPLACEffNEWER,CHECKSUM=NO, LIST=NO <CR>

(8) After ensuring that ALL TASKS ARE OUT OFCADDS (exited, not resumed) install MIDAS by typing-

CII.MIDAS.INSTALL <CR>

When this execute file finishes, the installation of MIDASis complete. All tasks can now re-enter CADDS. (8) Setthe protection of the MIDAS menu source file to limit thewrite access to authorized users by typing.

CHGPROT DATA.CII. 120.&BCD.&IDF, (protectioncode) <CR>

(10) Log onto a DCU, set the protection group again to0000, enter CADDS, and type in the command:

* ACT MIDAS <CR>

This will cause MIDAS to compile a new binary IDFunder the 0000 protection group. Remember to set yourprotection back to 0000 any time a new MIDAS IDF isloaded, or if the menus are changed, requiring a recompile.

Hardware Considerations

The MIDAS menus require the Computervision DCUworkstation. MIDAS does not require an APU. All other

58 APPENDIX C- TECHNICAL NOTES

CATALOGS USEL

workstation peripherals, such as the keyboard and thetablet, can be active at the same time. There are no otherhardware requirements.

CATALOGS USED

CFPOIL.FM - Contains all MIDAS menu parts, drawingforms, drawing figures, and MIDAS mooring components.

CII.FLIB - contains figures, parts and pulldown text filesfor CII and GUIDE. Not required to run MIDAS.

CU.PORT - contains software files needed for the installa-tion. After the installation is complete, this catalog may bedeleted.CII.MIDAS - Install file, verb/noun table and properties.

This cztalog can be deleted after the installation.

DATA.DOCINSERT.BOM - On-line help file

DATA.DOC.ANALYZE.MOORING - On-line help file

DATA.DOC.PUT.TABLE - On-line help file

DATA.DOC.GENERATE.MOORING - On-line helpfile

DATA.CII.120.&IDF - interface definition file forMIDAS

DATA.CII.120.&ICON - icon graphics file for MIDAS

DATA.CI.HEADER - file referenced by setup networkfigure

TAG.CADDS - Temporary files needed to load customMIDAS CADDS commands. This may be deleted after theinstallation.

A

3 APPENDIX C - TECHNICAL NOTES 59

CATALOGS USED

APPENDIX D - MISCELLANEOUS MIDAS MENUS

1IORS MENUS LOCRTION KEY

ICON COMMRNDICON N DEPTH N DEPTH

iCONGNENIENU RNS

ICON /i FUL LDOINNCICON OR(F)

USE 30 TRBLE ONLY USE 'RAO' IN KEYIF A 30 MODEL IS TO BOX IF HRRDPOINT ISBE BUILT. DEFINED AS AN ANGLERLL OTHER FUNCTIONS RNO RADIUS WITHWORK WITHOUT MODEL RESPECT TO THE BOUY

RLL ASSEM1BLIES PRE USE 'XYD' IN KEYPLACED ON THEIR BOX IF HRRDPOINT ISOWN UNIQUE LAYER. DEFINED S AN 'X'BE SURE TO KEEP PND 'Y' WITHTHE LAYERS STRAIGHT RESPECT TO THE BOUY

EACH ASSEMBLY CRN PLACE R '-' IN KEYBE VERIFIED FOR ITS BOX IF HRRDPOINT ISLENGTH, WEIGHT. RND NOT TO BE INCLUDEDBREAKING STRENGTH. IN THE MOORINGR FIT CHECK IS DONE MODEL. THERE IS NOON EACH COMPONENT NEED TO DELETE LINE

60 APPENDIX D - MISCELILANEOUS MIDAS MENUS

CATALOGSUSED

SELECT SIZE SELECT SIZE

2.50 2.75 ETC. 2.50 2.75 ETC.

END LINK

PERR LINK

SWIVEL. 1 LINK

CHRIN JOINING LINK%: -r-- CHAIN SWIVEL SHACKLEI

{ANCHOR JOINING LINK'

RISER SWIVEL SHACKLE

LINK RNODE

I 1Miscellaneous Menus

MISCELLANEOUS MIDAS MENUS 61

CATALOGS USED

STOCKLESS W/ S7RB ' WIRE CLOSED-CLOSED

62TTOWR OPEEL N -COSEMDMEU

DISTRIBUTION LIST

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n o e l - dtic · midas has been designed for use by persons having less than 40 hours of basic...

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