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Version 2017

Release Notes

Release Notes EXCITETM v2017

AVL LIST GmbH Hans-List-Platz 1, A-8020 Graz, Austria http://www.avl.com

AST Local Support Contact: www.avl.com/ast-worldwide

Revision Date Description Document No.

A 30-Apr-2009 EXCITE v2009 - Release Notes 06.0101.2009

B 17-Jul-2009 EXCITE v2009.1 - Release Notes 06.0101.2009.1

C 30-Nov-2009 EXCITE v2009.2 - Release Notes 06.0101.2009.2

D 30-Mar-2010 EXCITE v2009.3 - Release Notes 06.0101.2009.3

E 19-Nov-2010 EXCITE v2010 - Release Notes 06.0101.2010

F 25-Mar-2011 EXCITE v2010.1 - Release Notes 06.0101.2010.1

G 29-Jul-2011 EXCITE v2011 - Release Notes 06.0101.2011

H 02-Dec-2011 EXCITE v2011.1 - Release Notes 06.0101.2011.1

I 16-May-2012 EXCITE v2011.2 - Release Notes 06.0101.2011.2

J 20-July-2012 EXCITE v2011.2.1 - Release Notes 06.0101.2011.2.1

K 25-Jan-2013 EXCITE v2013 - Release Notes 06.0101.2013

L 17-June-2013 EXCITE v2013.1 - Release Notes 06.0101.2013.1

M 15-Nov-2013 EXCITE v2013.2 - Release Notes 06.0101.2013.2

N 15-May-2014 EXCITE v2014 - Release Notes 06.0101.2014

O 28-Feb-2015 EXCITE v2014.1 - Release Notes 06.0101.2014.1

P 26-Feb-2016 EXCITE v2016 - Release Notes 06.0101.2016

Q 28-Feb-2017 EXCITETM

v2017 - Release Notes 06.0101.2017

Copyright © 2017, AVL

All rights reserved. No part of this publication may be reproduced, transmitted, transcribed, stored

in a retrieval system, or translated into any language or computer language in any form or by any

means, electronic, mechanical, magnetic, optical, chemical, manual or otherwise, without prior

written consent of AVL.

This document describes how to run the EXCITETM

software. It does not attempt to discuss all the

concepts required to obtain successful solutions. It is the user’s responsibility to determine if

he/she has sufficient knowledge and understanding of structural dynamics to apply this software

appropriately.

This software and document are distributed solely on an "as is" basis. The entire risk as to their

quality and performance is with the user. Should either the software or this document prove

defective, the user assumes the entire cost of all necessary servicing, repair, or correction. AVL and

its distributors will not be liable for direct, indirect, incidental or consequential damages resulting

from any defect in the software or this document, even if they have been advised of the possibility

of such damage.

EXCITETM

is a trademark of AVL LIST. EXCITETM

will be referred as EXCITE in this manual.

The names of the software and hardware products used in this manual are mostly the respective

trademarks or registered trademarks of their companies.

http://www.avl.com/

http://www.avl.com/ast-worldwide


AST.06.0101.2017 - 28-Feb-2017 i

Table of Contents

1. Release v2017 ____________________________________________________ 1-1

1.1. EXCITE Power Unit __________________________________________________________ 1-1

1.1.1. New Features ____________________________________________________________ 1-1

1.1.1.1. Valve Train Component ________________________________________________ 1-1

1.1.1.2. Automatic Generation of Retained Nodes for Flexible Advanced Cylindrical

Gear Joint (FlexACYG) ________________________________________________ 1-3

1.1.1.3. Simple Hypoid Gear Based on Maps Created by Tooth Contact Analysis

(TCA) (beta-feature) ___________________________________________________ 1-4

1.1.1.4. Advanced Cylindrical Gear Joint: Visualization of Contact patterns at

flank-surfaces (Engagement Field Plots) _________________________________ 1-5

1.1.1.5. Rolling Element Bearing Joint: Import of KISSsys Bearing Data ____________ 1-7

1.1.1.6. Drag Torque and Loss Calculation in Clutch Joint ________________________ 1-8

1.1.1.7. EHD Contact – Non-stationary Heat Balance including Boundary Structures 1-9

1.1.1.8. New Property Database _______________________________________________ 1-10

1.1.1.9. New Handling of Node Sets ___________________________________________ 1-10

1.1.1.10. New Utility – Evaluate Web Stiffness __________________________________ 1-12

1.1.1.11. New Preprocessing Script – Convert Total Forces and Moments from

Unbalance to FEM __________________________________________________ 1-14

1.1.2. FE Interface Enhancements ______________________________________________ 1-14

1.1.2.1. Apply External Forces to FE Analysis Task – Dynamic Response Analysis –

Abaqus _____________________________________________________________ 1-14

1.1.2.2. Abaqus 2016 _________________________________________________________ 1-16

1.1.2.3. Ansys 17.2 __________________________________________________________ 1-16

1.1.2.4. MSC Nastran 2014 and 2016 __________________________________________ 1-16

1.1.2.5. NX Nastran 9 and 10 _________________________________________________ 1-16

1.1.2.6. OptiStruct 14.0 ______________________________________________________ 1-16

1.1.2.7. New Support of AVL FIRETM

for Thermal Load Analysis _________________ 1-17

1.1.3. Post-processing Enhancements ____________________________________________ 1-18

1.1.3.1. Piston Report Extensions _____________________________________________ 1-18

1.1.3.2. Tool – Export Case Set Results – Extensions ____________________________ 1-19

1.1.4. Other Enhancements_____________________________________________________ 1-19

1.2. EXCITE Designer ___________________________________________________________ 1-23

1.2.1. New Features ___________________________________________________________ 1-23

1.2.1.1. MB and Web Load: Extended Modeling of Main Bearings and Additional

Results _____________________________________________________________ 1-23

1.2.1.2. Torsion: Potential Energy Distribution in Torsional Modes _______________ 1-25

1.2.2. Enhancements __________________________________________________________ 1-25

1.3. EXCITE Piston&Rings _______________________________________________________ 1-26

1.3.1. Reworking the 3D Ring Dynamics Module __________________________________ 1-26

1.3.2. Enhancement of Ring Dynamics Modeling Approach _________________________ 1-26

1.3.3. Enhancement of GUI Input Data __________________________________________ 1-27

1.3.4. Enhancement of Results Post-Processing and Animation _____________________ 1-27

1.3.5. Storing Data for Thermal Load Calculations ________________________________ 1-28

1.3.1. Enhancements __________________________________________________________ 1-29

EXCITETM v2017 Release Notes

ii AST.06.0101.2017 - 28-Feb-2017

1.4. EXCITE Timing Drive _______________________________________________________ 1-30

1.4.1. Enhancements __________________________________________________________ 1-30

1.5. EXCITE Acoustics ___________________________________________________________ 1-31

1.5.1. New Features ___________________________________________________________ 1-31

1.5.1.1. Customized Color Settings ____________________________________________ 1-31

1.5.1.2. DB Weighting for 3D Sound Pressure Level Results and Audio Files _______ 1-32

1.5.1.3. Show Acoustic Surface ID’s ___________________________________________ 1-32

1.5.1.4. Automatic Mesh File Export ___________________________________________ 1-33

1.5.1.5. Mapped Velocity Visualization _________________________________________ 1-33

1.5.1.6. Sound Power Level (ISO 3745)_________________________________________ 1-34

1.5.1.7. Bar Chart for Octave and 3rd

Octave Bands ______________________________ 1-36

1.5.2. Enhancements __________________________________________________________ 1-36

1.6. EXCITE Pre-processing Tools ________________________________________________ 1-37

1.6.1. Shaft Modeler: New Features _____________________________________________ 1-37

1.6.1.1. Gyroscopic Modal Analysis: Resonances_________________________________ 1-37

1.6.1.2. Modal Analysis of Flexibly Supported Shaft: New Options ________________ 1-37

1.6.1.3. Enhancement ________________________________________________________ 1-38

1.6.2. Autoshaft _______________________________________________________________ 1-38


28-Feb-2017 1-1

1. RELEASE V2017 This document describes the new features and enhancements in AVL Workspace v2017 for

the following:

EXCITETM

Power Unit

EXCITE TM

Designer

EXCITE TM

Piston&Rings

EXCITE TM

Timing Drive

EXCITE TM

Acoustics

Shaft Modeler

AutoSHAFT

Changes described here can also be found in the updated documentation.

Resolved bugs and known issues are now available on the Customer Service Portal. Please

contact your local support to get access.

1.1. EXCITE Power Unit

1.1.1. New Features

1.1.1.1. Valve Train Component

All basic valve train templates, which were introduced in v2016, provide an option for an

extended definition of valve train configuration.

The new configurations allow using hydraulic lash adjuster components – hydraulic insets

for tappets or levers as well as hydraulic support components (“lifters”) for drag levers – in

EXCITE Power Unit valve train models.

Similar to the models of the hydraulic lash adjuster components in EXCITE Timing Drive

the internal representation of the hydraulic lash adjusters considers

their mechanical parts as rigid bodies

the springs in the system and mechanical contacts between the bodies as joints

with stiffness and damping properties

the supply pressure and the pressure changes in supply and working volume


1-2 28-Feb-2017

oil compressibility variation due to aeration

oil flows through annular gaps and in the check valve

and force transfer from the pressure in the hydraulic volumes to the mechanical

components

In addition to this, valve train configurations with levers and bridge components can be

considered now for “floating” and “guided” bridges. By default, simple elastic

representations of bridges are calculated from some basic geometry input by a modeler.

Similar to the rocker components, users are free to use externally generated (condensed)

body models instead. In this case users have to take care to use the appropriate coordinate

systems to generate the condensed models.

The new configurations result in a significant increase of required input data. To keep the

modelling approach, on the one hand, as simple as possible and on the other hand, provide

enough flexibility, two modelling levels have been introduced:

BASIC level reduces the required input to a minimum. Wherever possible,

reasonable default values are set and the corresponding inputs are hidden from the

working panels in the graphical user interface (most of the joints, for instance).

DETAILED level gives the user access to all required inputs.

Users can switch between the modelling levels whenever they want.

A further extension which has been introduced is the optional consideration of variable

cam/follower contact stiffness. This is mainly used with flat or spherical tappets, where the

effective stiffness in the cam/follower pair may significantly depend on the eccentricity of

the contact point.


28-Feb-2017 1-3

1.1.1.2. Automatic Generation of Retained Nodes for Flexible

Advanced Cylindrical Gear Joint (FlexACYG)

A new Python script “Retained Nodes for FlexACYG” has been developed in order to

automatically generate the retained nodes for the Flexible Advanced Cylindrical Gear Joint.

In contrast to the standard simulation where the nodes are located at the rotation axis, in

the case of FlexACYG the wheel body is considered as a full flexible body by using

circumferential retained nodes placed close to the root area of each individual tooth.

Significant effort may be required to generate these nodes manually, whereas it can be

done within a few minutes by using the Python script.

In a first step only the mesh file of the gear and its unit system have to be defined. After

starting the script, it tries to determine all relevant gear properties automatically. If for

some reason (e.g. poor quality of the mesh) no values or a wrong value for a particular

property is found, the user is able to define or overwrite it by editing a so-called session file

and rerun the script.

It ends up with the newly generated retained nodes and their connection to the FEM

structure.


1-4 28-Feb-2017

The script is available within Utilities | Python Scripts or can be used as a stand-alone tool.

1.1.1.3. Simple Hypoid Gear Based on Maps Created by Tooth

Contact Analysis (TCA) (beta-feature)

A new generic gear-joint type for modelling hypoid and bevel gears (abbreviated

SHYP_TCA) has been implemented.

In contrast to the already existing regular SHYP-joint, where Mesh Point (MP) location

and direction of Line of Action (LoA) are derived from specified pitch cone geometry, the

SHYP_TCA-joint allows 2D-maps created in a preceding Tooth Contact Analysis to be

imported.

The following quantities and their dependency on pinion-rotation angle and meshing force

can be considered via 2D-maps:

Position of the summarized Mesh Point

Direction of the summarized Line of Action

Amount of the kinematic transmission error (TE) imposed by the hypoid mesh

Effective meshing stiffness


28-Feb-2017 1-5

The main advantage of the SHYP_TCA-joint is that all relevant fluctuations arising in a

hypoid or spiral bevel gear mesh can be considered adequately. Compared to the regular

SHYP-joint where only a variable meshing stiffness can be considered, the meshing force

fluctuations computed via the from SHYP_TCA-joint are more closer to the real hypoid

behavior.

Note that the required (generic) 2D-maps obtained through TCA-tools (such as

ANSOL/Calyx) need to be provided by the user itself. The current version of EXCITE

Power Unit does not support the map generation itself and is just available as a beta-

version as there are still a few limitations regarding usage.

1.1.1.4. Advanced Cylindrical Gear Joint: Visualization of Contact

patterns at flank-surfaces (Engagement Field Plots)

For the Advanced Cylindrical Gear Joint (ACYG) a new contact result visualization method

has been provided. The so-called Engagement Field Plots can be used to visualize the

distribution of contact properties (e.g. the load intensity/line load) along the profile height

and the face width of the pinion. Optionally, the profile height direction can be expressed

by the Roll Distance.


1-6 28-Feb-2017

Contact patterns can be created for a series of flank surfaces at all pinion tooth indices in

order to depict the time/angle progression of the contact results. For stationary applications

(e.g. gear whine) only a single engagement field plot for the last pinion tooth index is

provided optionally.

In addition to contact patterns at flank surfaces additionally the Face Load Factor (KHβ)

similar to ISO 6336 is provided as time/angle progression as well as a single constant value.

The new visualization technique is provided through EXCITE User Defined Result

framework and is directly based on the animation data files as exported for the Advanced

Gear Animation Tool (AGP).


28-Feb-2017 1-7

1.1.1.5. Rolling Element Bearing Joint: Import of KISSsys Bearing

Data

For Rolling Element Bearing joints a detailed contact geometry and material/friction data

can now be imported from KISSsys roller bearing elements. By selecting Import from

KISSsys, roller bearing element data-files (in xml-format) exported from KISSsys can be

assigned to an EXCITE roller bearing joint.

By doing so internal contact properties and other bearing data such as material and friction

parameters can be taken over from KISSsys roller bearings. Thanks to this feature

EXCITE users can now access bearing catalogues of various suppliers as available in

KISSsys.

A precondition for exporting roller bearing data is the availability of the AVL EXCITE

Interface within KISSsys. In order to obtain the interface file suitable for the used KISSsys-

version, users are asked to contact the KISSsys software support at KISSsoft AG directly.


1-8 28-Feb-2017

1.1.1.6. Drag Torque and Loss Calculation in Clutch Joint

The elasto-plastic clutch joint (EPCL) has been extended with the possibility to calculate

the drag torque due to oil shearing of a disengaged wet clutch and the resulting losses.

Traditional approaches based on an analytic formula deliver unrealistic values for the drag

torque, in the case of extreme operating temperatures. In particular at low temperatures

(below 0° Celsius) and a completely filled clutch the viscous drag torque is overrated.

Two phenomena have been considered in the actual model, which make the simulation

more realistic compared to traditional approaches:

• Oil thinning, which is oil dynamic viscosity reduction due to shear velocity

gradient.

• The power balance between oil’s shear stress, oil flow temperature variation

and wall heat transfer.

Grooves in clutch discs are not considered. The actual approach assumes plain clutch discs.


28-Feb-2017 1-9

1.1.1.7. EHD Contact – Non-stationary Heat Balance including

Boundary Structures

In order to calculate the thermal effects in slider bearings more accurately, the EHD

contact model has been extended by a model for the temperature distribution into the solid

housing and journal structures. The model includes thermal interface conditions between

the lubrication oil and the adjacent structures as well as the mixing process of the oil in

supply areas.

The defined layer thickness s for the conductive heat flow is automatically split up into an

equivalent surface layer seq and remaining radial or axial thickness s - seq of the structure.

The thickness of the equivalent surface layer is derived internally from the non-stationary

heat transfer conditions and dependent on the penetration of the cyclic temperature wave.

Shell / Housing Journal

Half of the defined discretization layers is used within the equivalent surface layer

thickness.

The enhancements have been implemented for all EHD contact joints – EHD2, EPIL and

AXHD. For AXHD an appropriate axial layer thickness for the conductive heat flow on both

sides – thrust and flange side – can be defined.


1-10 28-Feb-2017

1.1.1.8. New Property Database

The entire Oil Properties Database has been replaced by a newly developed Property

Database, based on the new Simulation Desktop architecture.

The following new features have been implemented:

Support of 3D tables to define temperature, pressure and shear rate dependency.

Extension of Barus models to consider Alpha as a function of pressure and

temperature.

Extension of Cross models to consider the shear rate as a function of temperature.

Mind: as the oil type definition for the model is now stored in the model project

file (.proj), it is important to share both files – <model>.ex and <model>.proj –

for e.g. handover to other users or support.

1.1.1.9. New Handling of Node Sets

In previous versions all node sets available in the Node Sets dialog have been automatically

exported to .exb files either on closing the Node Set dialog or while saving the model. As a

consequence the appropriate .exb files got modified each time and this made many users

uncertain.

Therefore the following changes have been implemented in v2017 regarding node sets

management:

1. Node sets are now stored to an adjacent external file with extension .exb_sets.

2. All node set manipulations like adding, deleting or changing sets will be made to

the adjacent .exb_sets file only.

3. The original generated .exb file will not be modified at all.


28-Feb-2017 1-11

4. Existing node sets in the original .exb file will be copied to adjacent .exb_sets file

during the first operation. The sets in the original .exb file will stay untouched.

5. The automatic export while closing the Node Sets dialog or saving the model is

disabled per default.

6. The user can now either turn on or off the synchronization of all node sets or a

single node set, which means to re-read the sets from .exb_sets while opening the

Node Sets dialog and export them again while closing the dialog or saving the

model.

7. Each node set is now marked with a colored EXCITE logo at the tree node icon.

Dark blue EXCITE logo indicates that node set

will be synchronized automatically

Light blue EXCITE logo indicates that there is a

copy in the .exb_sets file, but synchronization is

turned off

No logo indicates that there is no copy of the node

set in the .exb_sets file

8. EXCITE GUI expects unique node sets across the whole model. Therefore now

checks for name collisions are performed and any findings indicated with a red

exclamation mark. The user has then the possibility to either rename or remove

duplicates.

9. Within the Node Sets dialog the node sets are now grouped in 4 categories

according to their origin:

a. Auto-Search

b. User Defined

c. Modelers – (e.g. generated by Shaft Modeler or Conrod Modeler)

d. FE Model (3D Mesh) – (imported when parsing the 3D mesh input file for

e.g. showing FE model in 3D-View)


1-12 28-Feb-2017

10. When deleting a set which also exists in the .exb_sets file, the user is asked if the

node set should also be removed from the condensed model file.

11. If the original .exb file gets newly generated and replaced (gets a newer modification

time than its adjacent .exb_sets file), the user is asked what to do:

a. Merge the node sets that are found in a newer .exb file to the existing sets

in .exb_sets (an existing set will be overwritten, new sets will be added).

b. Ignore any new found sets and keep using the existing .exb_sets file.

12. .exb files generated by modelers are always recreated anew before the simulation

runs. Therefore for this category node sets cannot be edited at all.

1.1.1.10. New Utility – Evaluate Web Stiffness

The utility calculates the stiffness values for in-plane, out-of-plane bending and torsion of

each defined crankshaft web based on the structured or condensed stiffness matrix. In

addition the web displacement at journal center due to pre-defined loads will be printed and

plotted. Finally a centrifugal load acting on the mass points of a structured model,

generated with Shaft Modeler, can be applied to each web and the appropriate deformation

will be printed in the report file.


28-Feb-2017 1-13

Results are plotted as bar charts for each web stiffness and are available as an IMPRESS Chart

report. All results as well as information on input data are printed to the report file, too.

Finally a comparison between 2 different crankshaft models is possible.


1-14 28-Feb-2017

1.1.1.11. New Preprocessing Script – Convert Total Forces and

Moments from Unbalance to FEM

This script enables to read the total forces and moments from the calculated Unbalance

results and output them to either an Abaqus or Nastran input format. Output for both

time and frequency domain is supported.

The generated input file for Nastran contains some comments in the file header, Executive

Control cards, like SOL 109 or SOL 111, Case Control cards like I/O statements,

SUBCASE, TSTEP or FREQ, DAREA and finally the complete Bulk Data entries with the

appropriate TSTEP or FREQ, TLOAD1 or RLOAD1, DAREA and TABLED1 cards.

The generated Abaqus input file contains the *AMPLITUDE cards, which reference to

created input files, a *FREQUENCY step, and either a *MODAL DYNAMIC or *STEADY

STATE DYNAMIC step with the appropriate *CLOAD cards.

1.1.2. FE Interface Enhancements

1.1.2.1. Apply External Forces to FE Analysis Task – Dynamic

Response Analysis – Abaqus

For both methods – Modal Transient and Mode-based Steady-state – external forces can be

added to the EXCITE excitations and a common input file written with the combined

excitations.

This feature has been mainly developed to add e-machine stator/housing excitations from a

numerical magnetic field simulation and combine them with forces calculated by EXCITE.

The appropriate extensions can be activated under Boundaries tab Apply External Forces.


28-Feb-2017 1-15

In this dialog a list of external forces can be added and especially for e-machines the

operation Circular Cloning can be applied to easily multiply the excitations from one

segment to the entire stator housing.

The Load Data dialog enables the appropriate external forces to be imported either versus

time or as frequency data (real and imaginary part) using the common file interfaces – .gid,

.txt, .csv, etc.. Same as for common Load Data dialog, forces can be manipulated and

operations applied like cyclic shift, make periodic, add,/scale/rotate, etc.

Finally, when applying external loads as complex data, an ordinal mapping can be

performed.

Other FE solvers will be supported in subsequent releases v2017.1 and v2018.


1-16 28-Feb-2017

1.1.2.2. Abaqus 2016

Abaqus 2016 is now supported throughout AWS. In particular:

All FE Analysis tasks have been adjusted and EXCITE FEA solvers for both

platforms - Windows/x86-64 and Linux/x86-64 - are available, too.

Utility ‘Convert FE Data’ can convert an Abaqus 2016 .sim file to .exb file.

Utility ‘Modal Data Recovery’ is able to perform a modal stress recovery

reading modal stress data from an Abaqus 2016 .sim database.

Due to inconsistent compiler versions on the Windows/x86-64 platform, IMPRESS 3D will

not be able to access results from an Abaqus 2016 .odb output database.

SIMULIA provides a native abaqus toexcite translator that reads Abaqus data from a

substructure SIM file and writes data to an EXCITE flexible body interface (.exb) file.

The usage is:

abaqus toexcite job=job-name substructure_sim=sim-file

1.1.2.3. Ansys 17.2

Ansys 17.2 is now supported throughout AWS, too. Compared to the previous version 16.0

no significant changes took place.

1.1.2.4. MSC Nastran 2014 and 2016

New DMAP alter files have been introduced (AVL_alter.v2014 and AVL_alter.v2016 as well

as AVL_alter_acms.v2014 and AVL_alter_acms.v2016) to support the latest releases – MSC

Nastran 2014 and 2016 – for condensation jobs. In addition all case based tasks got minor

updates to write proper input files for data recovery for the new MSC Nastran versions.

1.1.2.5. NX Nastran 9 and 10

New DMAP alter files have been introduced (AVL_alter_nxn.v9 and AVL_alter_nxn.v10) to

support the latest releases – NX Nastran 9 and 10 – for condensation jobs. In addition all

case based tasks got minor updates to write proper input files for data recovery for the new

NX Nastran versions.

1.1.2.6. OptiStruct 14.0

Also OptiStruct 14.0 is now fully supported for all FE Analysis tasks and Utilities.

Moreover additional enhancements have been made for:

Condensation:

Possibility to perform a free-interface substructure (Craig-Chang)

Modal transient or frequency response analysis:

Proper support of AMSES or CDH/AMLS

Job submission for running OptiStruct solver via JMS


28-Feb-2017 1-17

Mind: since OptiStruct 14.0.230 also the mesh information is written by the OptiStruct

solver as well as the recovery matrix output to a separate *_RECOVER.exb file.

1.1.2.7. New Support of AVL FIRETM for Thermal Load Analysis

For the FE Analysis task – Thermal Load Analysis – the AVL FIRE solver is supported.

It is now possible to make settings like for the Abaqus solver and generate ASCII files

containing the heat flux as well as heat transfer coefficients (HTC) on a given surface grid

for AVL FIRE.

Both heat flux and heat coefficients can be applied in AVL FIRE as boundary conditions for

a transient thermal analysis.


1-18 28-Feb-2017

1.1.3. Post-processing Enhancements

1.1.3.1. Piston Report Extensions

The standard Piston Report has the following new results implemented:

Piston noise excitation index (PNEI)

Piston noise response index (PNRI)

Piston1 - Noise Indices

Noise Excitation Index

0.000

0.001

0.002

Excita

tio

n I

nd

ex (

-)

1000 1500 2000 2500 3000 3500 4000 4500

Engine Speed (rpm)

0.0004

0.0011

0.0015

0.0017

0.0015

0.0014

0.0004

0.0011

0.0015

0.0017

0.0015

0.0014

PNEI (-)

Noise Response Index

0

1.1

2.2

Re

sp

on

se

In

de

x (

-)

1000 1500 2000 2500 3000 3500 4000 4500

Engine Speed (rpm)

0.71

0.87

1.32

1.98

1.761.69

0.71

0.87

1.32

1.98

1.761.69

PNRI (-)

Moreover the report generation has been improved considerably and works now for all

types of engines (inline, V) as well as engine orientations.


28-Feb-2017 1-19

1.1.3.2. Tool – Export Case Set Results – Extensions

For exporting excitation data in frequency domain to Nastran Bulk Data format the user

has the possibility to combine quantities like applied external loads and constraint forces as

well as merge excitations on different bodies to one common input file with unique load

identification numbers.

In addition there is now the option to output the frequency results as subcases versus

order, too.

1.1.4. Other Enhancements

Advanced Gear Joint: 'Quick' consideration of circular end relieves for lead corrections

E10-8183

Currently for lead corrections only a linear shaped end relieve (C_beta) can be selected in

the GUI. As a short term solution, a circular-arc shaped end relieve can be taken into

consideration when defining a negative value for the relieve length L_C.

Example:

* C_beta = 10 mym; L_C = 10 mm: Creates a >linear< end relieve of 10 mym cutback

starting at 10 mm distance from the end plane.

* C_beta = 10 mym; L_C = -10 mm: Creates a >circular< end relieve of 10 mym starting

at 10 mm distance from the end plane.

CAM Joint: Variable "contour" stiffness and damping

E20-2622

Variable "contour" stiffness and damping dependent on the position of the contact along the

contour description can be considered now.

CMAT is missing in exb file

E20-2423

When using a condensed model without a corresponding CMAT array in the exb file, the

solver crashed. The problem occurred when the CMAT array was not generated during the

condensation process. This typically happened when forgetting a corresponding command

in the condensation control file. In the case of ABAQUS this is "*FLEXIBLE BODY,

TYPE=EXCITE" in the "* SUBSTRCTURE GENERATION" card. Due to this an internal

NOD6 body was assumed, which finally caused the crash in the kernel. Additional error

checks have been implemented to prevent this kind of model inconsistency.

EHD2 and TEHD Joints: Axial Friction Results

E30-3669

If 'Consider Axial Friction Forces' is requested in 'Bearing Data' properties for an EHD2

joint, the appropriate result is now available at joint results tree entry 'Friction Forces &

Moments'. This shows results for 'Axial Friction Force' related to both connected bodies.

EHD2/ENHD/NONL Joints: Incorrect displacement/orbital path results for uneven amount

of circumferential FE-Nodes


1-20 28-Feb-2017

E20-2730

In the case of an uneven amount of circumferential FE-Nodes (but more than 1) the orbital

path/displacement results were incorrectly computed. This has been fixed.

EHD2/EPIL/TEHD Joints: Minimum/maximum axial coordinate

E20-2347

Information on minimum and maximum axial coordinate (measured in joint coordinates) is

given in simulation.out (message 1630027).

EHD2 Joint: Mass balance corrected discretization scheme

E20-2686

Alternative discretization schemes for the shear, squeeze and transient term of the

Reynolds equation are available now. These new discretization schemes ensure a better

mass balance in general. Especially if high local clearance height changes are present (e.g.:

geometric boundary condition), not only mass balance is improved significantly but also the

hydrodynamic pressure distribution becomes more realistic.

Element copy and load module keeps the original name and only increases index if

necessary

E10-6812

Copy/paste and loading modules does not revert Body/Joint name to default value anymore.

Element Copy Data for different Radial Bearings

E10-7154

Element Copy Data is now allowed between Radial Bearings (CC, CS and SS) even if a

different type is selected.

EPCL Joint: Drag Loss Calculation

E20-2610

With the feature of drag loss calculation a temperature-dependent, 2-phase evaluation of

drag power/torque of disengaged wet clutches has been done.

EPCL Joint: Friction Force Results

E20-2927

The friction force shares of the clutch can be plotted separately.

FE Interfaces: Importing a thermal deviation from Abaqus .odb

E30-3782

So far the import of a thermal deviation from an Abaqus .odb file only supported the

definition of the surface to be considered by predefined surfaces in CAE. Now the user can

also define the surface via predefined node sets. In addition INSTANCES are supported.

Kinetostatics Solver

E20-2796

The performance of the kinetostatics solver has been enhanced. The obtained results

remain unchanged.

Long initialization time due to initial conditions

E20-2277

Some models took a large number of iterations during the first couple of time steps. This

was caused by initial conditions with approximately zero value. Due to coordinate

transformations etc. (as for instance in the case of V engines) and according round off

errors, signs of in particular velocities may have changed in these cases, which caused the

bad performance. Corresponding enhancements were implemented both in GUI and in the

kernel.

MATLAB Co-simulation: Link to MATLAB

E20-2770


28-Feb-2017 1-21

Automatic starting of MATLAB via EPU for Simulink co-simulations has been restored.

This fix is available for all MATLAB releases greater than R2014b. Older releases still

require a definition of the environment variable FLAME_files. Its value needs to be set to

<installation_path>/IMPRESS/files.

Mode Selection "Power Unit w/o Crank Train"

E10-8132

Up to now users had to specify data from "Cranktrain Globals" even with models which did

not use any engine/powerunit related components. For such models a new mode called

"Power Unit w/o Crank Train" has been introduced. The new mode can be set in Simulation

| Change Mode.

In "Power Unit w/o Crank Train" mode, the "Crank Train Globals" do not need to be

specified. To get correct correlation between time and reference angle, the reference speed

must be set in Model | Define Reference Speed.

Oil Supply Line (OSL) coupling between EHD2 joints

E20-2748

The coupling method between the hydraulic network and the elasto-hydrodynamic joint

was enhanced.

In models where the hydraulic network is connected to a geometrically defined deep groove

the existing strategy failed. With the introduction of an impedance coupling strategy on the

OSL side this problem could be overcome.

With v2017 also the EHD side is treated with an impedance coupling. This now gives

matching flow results between EHD and OSL. No change of user input is necessary.

Primer Models: Initial Conditions

E30-3297

The phasing out variable torque (TPout) has been added to all relevant Primer installation

models. This improves the initial conditions and leads to almost stable conditions after 3

engine cycles.

Results: Body Results Creation

E30-3470

The evaluation of body results has been enhanced by collecting the result requests for one

body and introducing a new function call calc_standard_body_results() in 'results.py'. This

function now opens the binary results data base only once instead of every time for each

node in previous versions. The speed up is in the range of 10 to 30 %.

Results: Full result representation for entire evaluation range although job terminated

earlier

E30-3194

As soon as 'Constant Result Step Size' was enabled in Results - Control, the evaluation tool

also performed an extrapolation of the existing results and generated and plot results for

the entire defined evaluation range.

Now the user will get a warning message, that not all results for the requested interval are

available and only results for calculated steps will be represented in plots.

REVO/NONL Joints: Axial Friction Results

E30-3117

If 'Consider Axial Friction' is requested in 'Friction' properties for joint REVO or NONL,

the appropriate result is now available at the joint results tree entry 'Friction'. This shows

results for '(Total) Axial Friction Force'.

Tools: Import element face sets from Abaqus input file and write to .exb file

E30-3108

Element face sets from Abaqus input file are now imported properly including the face

identifier label and are stored in .exb file in the following notation:


1-22 28-Feb-2017

Face ID, Face Label

Such imported face sets can now be selected at the data recovery utility.

Utilities - Convert FE Data: Recovery Matrix

E30-3685

Since users request a recovery matrix, the matrix will now be written to a separate file,

called "<bodyname<_RECOVER.exb", as default.

Utilities - Fretting Analysis: Add profile from file at Redefine Node Coordinates

E30-3709

At Utility - Fretting Analysis - Redefine Node Coordinates, it is now possible to import any

e.g. measured profile from a file of the assembled structure and add it to the modified

geometry of the bearing surface nodes. This option is only available for Method - Bore

Definition.

Utilities - Data Recovery: Ansys .tcms error handling

E30-3812

EXCITE Data Recovery on processing .tcms file in the case of error gives more helpful

information now.

Additionally, defining environment variable TCMSDUMP provides more detailed node/dof

information on the following dumped files:

- tcmsNodes.txt: details on tcms data

- condensedNodes.txt: details on EXCITE data

Utilities - excite_exbd: Extended to dump full DOFT and GEOM table from .exb file

E30-3927

The command line utility 'excite_exbd' has been extended to enable the dumping of the full

table of degrees-of-freedom (DOFT) containing all ASET + OSET degrees-of-freedom as

well as geometry table (GEOM) of the entire model from an .exb file. The new command

line arguments are '-doftALL' and '-geomALL'.

Utilities: exciteDload code restructured and new GIDAS reader incorporated

E30-3910

This issue was caused by the channel "IFrc" being removed from GIDAS result files for

condensed bodies, which performed global rotation. The code has been updated to

incorporate a new GIDAS file reader used by exciteRes.

Utilities: Import Temperature Profile from FE Analysis

E30-3846

The largest element size can now be defined at 'Import Temperature Profile from FE

Analysis' to enhance the speed for identifying the non-contact area. This will avoid an

expensive computation of the same value by the program internally.

Utilities: Output total forces and moments from Unbalance to Nastran BDF / Abaqus INP

E30-3722

A new pre-processing script "Convert Total Forces And Moments from Unbalance to FEM"

is available which enables the creation of input files for Nastran and Abaqus solvers based

on the Unbalance data calculated by the "Unbalance" pre-processing script.


28-Feb-2017 1-23

1.2. EXCITE Designer

1.2.1. New Features

1.2.1.1. MB and Web Load: Extended Modeling of Main Bearings

and Additional Results

There is a new section in the Simulation Control dialog (marked on the image below),

which allows to prescribe the distribution of radial stiffness and damping in the main

bearings over their width. Note: the previous versions supported only the first option – End

Nodes Only.


1-24 28-Feb-2017

Another extension of the modeling capabilities is achieved by introducing flexible supports

for main bearing shells (shown on the scheme above). If Flexibly Supported Rigid Bearing

Shell is selected (marked on the image above), a new node and dialog window Bearing

Shell containing the relevant parameters will be activated for all main bearing joints (see

the image below).

In addition to the main bearing loads and web loads, linear and angular displacement and

velocity results for any node of the crankshaft can be calculated now, both in absolute and

relative (rotating) coordinate systems (see the mark below).

The group of such nodes can be chosen using the new section in the Simulation Control

window.

Besides that, a new type of result has been added, which evaluates the linear and angular

misalignment of the journal and shell in each of the main bearings (see the mark above).


28-Feb-2017 1-25

1.2.1.2. Torsion: Potential Energy Distribution in Torsional Modes

Together with the kinetic energy at nodes of the torsional vibration system, it is also

possible to see the potential energy of elastic elements for each mode, in the form of a bar

diagram.

1.2.2. Enhancements

Bearing Calculation: Butenschoen is set as the default calculation model

E10-8130

The default calculation model for the EXCITE Designer Bearing calculation is now set to

"Butenschoen".

Input-output correspondence for V-engines with bank-wise definition of cylinder IDs

E10-6576

For V-engines with bank-wise definition of cylinder IDs, the GUI re-numbered the

cylinders internally. Thus the cylinder numbering in the results did not correspond to the

defined cylinder IDs. The internal re-numbering has been removed.

Mount Layout Tool: Increase the max. number of mounts

E34-1271

The maximum number of mounts is set to 50. The mounts are grouped by their

characteristics within property charts now, instead of showing a curve for every single

mount.

Standard Reports: Create reports has to show current progress

E34-1182

Refined progress tracking for EXCITE Designer reports has been implemented.


1-26 28-Feb-2017

1.3. EXCITE Piston&Rings

1.3.1. Reworking the 3D Ring Dynamics Module

In the previously released version, the 3D ring Module showed instability. Therefore, the

source code was analyzed and the following modifications have been done:

The ring dynamics modeling approach was enhanced (details are given in the

next section).

A new Reynolds solver which is used to model the ring running face lubrication

was introduced. The solution technique ensures mass conservation within the

hydrodynamic contact area based on JFO boundary conditions. A fill ratio θ is

introduced to the Reynolds equation. Reynolds equation is solved for the fill

ratio, if the hydrodynamic pressure in the cell fails under the cavitation

pressure.

1.3.2. Enhancement of Ring Dynamics Modeling Approach

Starting from v2017 two approaches to calculate the gap between the ring surface and

piston flank as well as between the ring running face and the liner are facilitated. Namely,

the method used in the previous versions, which is called “Ring 2D Classic” and a new

method which is called “Ring 2D Enhanced”.

The user can select between these 2 methods as well as carrying out 3D ring dynamic

analysis by enabling the approach required as shown in the following figure:

The 2D classic ring implementation uses the following steps to calculate the ring-piston

flank and ring running face liner clearance as a function of the original coordinates and

twist and piston tilt angles:

Grid Points on the Piston Groove:

The new position of the grid points on the piston groove are updated by

rotating their coordinates around the ring center by the sum of tilt and twist

angles.

Grid Points on the Ring Flank:

The change of the position of the grid points on the ring flank are calculated by

rotating their coordinates by an angle equal to the sum of the piston tilt and

ring twist around the center of the ring cross section.

Grid Points on the Ring Running Face:

The new position is calculated by multiplying the axial coordinate by the

tangent of the sum of piston tilt and ring twist angles.


28-Feb-2017 1-27

The 2D Enhanced approach calculates the gap between the ring and piston flanks from one

side and between the ring running face and the liner wall from the other side as follows:

Grid Point on the Piston Groove:

The new position of the grid points on the piston groove are updated by

rotating their coordinates around the piston pin by the tilt angle.

Grid Points on the Ring Flank:

The position of the grid points on the ring flank are calculated in two steps. In

the first step, the coordinates are rotated around the piston pin by the tilt angle

and in the next step they are rotated around the center of the ring cross section

by the twist angle.

Grid Points on the Ring Running Face:

The new position is calculated by rotating the coordinates of the running face

grid points by the twist angle around the center of the ring cross section.

The 3D ring dynamics approach is based on the enhanced method.

1.3.3. Enhancement of GUI Input Data

The redundancy in the force balance iteration (accuracy at the GUI) input data is removed.

The number of time steps per crank angle and oil film force balance are required for 2D

ring modeling. For 3D ring modeling, the global iteration requires the number of time steps

per crank angle, a tolerance value for 3D ring dynamics solver and the maximum number

of iterations per time step.

1.3.4. Enhancement of Results Post-Processing and Animation

The results storage and handling are enhanced and all the known bugs in results post-

processing and animation are corrected. A more accurate presentation of the results at

thrust and anti-thrust sides for 3D ring modeling is introduced.

The following figures shows one of the capabilities of the 3D ring module in studying the

effect of liner bore distortion on the total pressure, the friction losses and wear rate.

Different levels of bore distortion are used: straight liner, medium 4th

order distorted liner

and large 4th

order distorted liner.

One can notice that the higher the bore distortion, the more significant the asperity and

consequently the wear rate will be. Also with respect to the average wear rate, one can

notice that the influence of the bore distortion on the first ring is less than the other 2

rings. This is due to the high gas pressure on the ring running face of the first ring.


1-28 28-Feb-2017

Total pressure on the ring running face

Straight liner (40 microns

deviation)

Max Deviation = 45 microns

Min Deviation = 35 microns

Max Deviation = 70 microns

Min Deviation = 10 microns

1.3.5. Storing Data for Thermal Load Calculations

Thermal Load Analysis (TLA) is used to evaluate and create contact heat transfer

boundary conditions. EXCITE Piston & Rings enables a contact analysis with the

evaluation of thermal load due to friction and non-stationary heat transfer coefficient

averaged over engine cycle.

Template files FavoritesDefinition_NNrings.fav are created to import additional

input data for thermal load analysis. Template file data (1.3) should be imported into

Model | Favorites Designer (1.1, 1.2, 1.4).

The provided input data can be checked or adjusted under Model | Favorites (2.1, 2.2). In

Simulation | Preprocessing Script | Thermal Load Analysis (3.1, 3.2) the TLA evaluation

will be started.


28-Feb-2017 1-29

The following outputs will be created: two Abaqus input files as well as an output file.

Abaqus input files contain thermal BC’s for stationary structural thermal analysis of piston

group and cylinder block. Another output file data can be used to create thermal BC’s for

any other FE solver.

1.3.1. Enhancements

General Interpolation Error

E10-8190

The program stops showing a "General interpolation error" if cylinder pressure or

thermodynamic data tables include multiple table entries for the same angle. To avoid such

problems additional data checks have been introduced to make sure that data within the

Crank Angle column is strictly ascending.

License Check for Spring Clip

E35-1057

The license check for ring clips is removed and it can be accessed by all customers.

Number of Interpolation Points on the Ring Running Face

E35-1056

The number of interpolation points on the ring running face was limited to 50. The limit is

removed and it is dynamically allocated. The only limit is that this number should be more

than the number of points which define the running face profile.

Running Surface: Mass Conserving Hydrodynamic Solver

E35-890

A mass conserving hydrodynamic solver has been implemented for the running face

contact. This algorithm is used if 2D-advanced or 3D ring is chosen.

Wrong Sign of the Ring Flank Radial Friction Force

E35-1020

The direction of the friction force was in the positive direction of the ring-flank relative

velocity. This sign is corrected.


1-30 28-Feb-2017

1.4. EXCITE Timing Drive

1.4.1. Enhancements

Case Set Reports

E30-4013

In previous versions 'standard_reports_caseset.py' was written to every folder and executed

for each case. Now there is one accumulated script written to the Case Set folder and

therefore modifications have been made to accommodate this (different) workflow.

Output/Evaluation of Absolute Spring Coil Positions

E10-8017

A new user defined result script called "ESPR absolute positions" is available. It evaluates

the absolute spring (coil) positions for spring macro components. Zero position is equivalent

to the bottom end of the spring.

User Defined Result Function "Contact Point Global"

E10-7801

The script for the determination of the global contact point in contour contacts was

extended to additionally extract the contact point expressed in the local coordinate system

of the 2 bodies.

User Defined Result Shear Stress: Update of Stress Concentration Factor

E10-8101

The stress concentration factor in the shear stress calculation of springs is now calculated

according to the formula by Bergstraesser. This results in 1-2% smaller stress

concentration factors compared to the previously used method and correspondingly the

stress levels are reduced by 1-2% compared to results achieved with previous versions.


28-Feb-2017 1-31

1.5. EXCITE Acoustics

1.5.1. New Features

1.5.1.1. Customized Color Settings

For newly introduced selections or panels the user can now change the colors (double click

on colored square). Notice that for Multi Local Velocity and Fluid-Fluid Coupling

Selections the colors are fixed with red and blue.


1-32 28-Feb-2017

1.5.1.2. DB Weighting for 3D Sound Pressure Level Results and

Audio Files

A new pull down menu has been introduced to select dB sound pressure weighting for all

3D results and Audio wave files. The pull down menu provides No, A, B and C weighting

according to DIN-IEC 651.

1.5.1.3. Show Acoustic Surface ID’s

If Selection Control is selected in the Elements Tree it is now possible to show the surface

id’s of an acoustic mesh if the corresponding check box (Surface Labels) is activated.

In this case (e.g. *_l.log) the log output can be analyzed more easily.


28-Feb-2017 1-33

1.5.1.4. Automatic Mesh File Export

Up to now the acoustic meshes generated during the pre-processing step have to be

exported manually (Export button in the ribbon).

With v2017 an additional automatic “naming export” has been introduced (Apply button).

The file naming conventions and positions are shown in the following example figure.

Merged Mesh:

modeling\geometry\meshes\EXCITE

Acoustics\file_name\I4demo\2017_02_30_1

5_51_12__acoustic_mesh.flm

Field Point Mesh:

modeling\geometry\meshes\EXCITE

Acoustics\file_name\I4demo\2017_02_30_1

5_59_04__field_point_mesh.flm

modeling\geometry\meshes\<client>\<project_name>\<model_name>\<date>__<mesh_type>

1.5.1.5. Mapped Velocity Visualization

To visualize the mapped velocity over frequency a new type of Simulation Task (Multi

Local Velocity (MLV)) has been introduced.

After a successfully finished simulation run, the mapped velocities can be imported to the

3D Viewer of IMPRESS M by selecting 3D | MLV Mapping and a specific Quantity (e.g.

Normal Velocity).


1-34 28-Feb-2017

1.5.1.6. Sound Power Level (ISO 3745)

With v2017 the output quantity Sound Power Level given by ISO 3745:2012 is supported.

For the calculation of the sound power level the measurement standard (sphere with 40

microphones) for free field is used.

If panels are defined, the contribution of each panel to the Sound Power Level is now also

available as dB(A), dB(B) and dB(C) weighted quantity.


28-Feb-2017 1-35

For the post-processing with IMPRESS M a corresponding new folder including all

quantities is provided.


1-36 28-Feb-2017

1.5.1.7. Bar Chart for Octave and 3rd Octave Bands

Compared to the previous releases, v2017 provides a new type of chart called bar chart

which can be used instead of the line chart template .

Notice the standard report template (E_AC_Report_001) uses the new bar chart instead of

the old line chart templates.

1.5.2. Enhancements

Audio Channel

SE37-314

The possibility of selecting Audio Channel (Mono/Stereo) has been implemented in v2017.

Audio Output Mono/Stereo

SE37-313

Audio output selection for Mono and Stereo has been implemented in v2017.

Effective Value for dB

SE37-254

The possibility of selecting the Effective Value for dB (rms/peak) has been implemented in v2017.

Microphone Pressure Output to Standard Output

SE37-393

With v2017 the Sound Pressure Level for the six standard microphones is written to the

standard output additionally.

MLV Geometry / Result File Definition

SE37-304

A new strategy for the definition of a Multi Local Velocity file pair is provided with the

present release. For those file types which contain geometry and results (*.odb, *.rst,

*,op2), an additional geometry file can be defined which overrules the geometry data of

*.odb, *.rst, *,op2.


28-Feb-2017 1-37

Panel Results as Phase

SE37-396

For the Panel Contribution Output a new quantity (Phase with unit radiant) has been

implemented in EXCITE Acoustics. The new panel quantity is automatically generated if

the acoustic model consists of at least one panel.

Pressure Peak versus RMS

SE37-194

With v2017 the user can decide if the pressure dependent results are based on peak or rms

values.

1.6. EXCITE Pre-processing Tools

1.6.1. Shaft Modeler: New Features

1.6.1.1. Gyroscopic Modal Analysis: Resonances

Two plots have been added to the Critical Speeds report, containing resonances, both in

absolute and relative (rotating) coordinate systems.

1.6.1.2. Modal Analysis of Flexibly Supported Shaft: New Options

There are new options now in the definition of main bearing radial stiffness for modal

analysis of flexibly supported shaft, with or without taking the gyroscopic effects into

account.

The new options are:

Radial stiffness definition separately for each main bearing

Speed dependent radial stiffness of main bearings


1-38 28-Feb-2017

1.6.1.3. Enhancement

Simple Floating and Guided Valve Bridge Models

E33-782

Structured models of simple floating and guided valve bridge are generated.

1.6.2. Autoshaft

FE Interfaces: FE Stress Mesh in ANSYS Format

E33-725

AutoSHAFT also exports FE stress meshes in ANSYS format now.

STROKE is replaced by CRANK RADIUS

E33-763

In .rpt and .rp2 files, STROKE is replaced by CRANK RADIUS (where applicable)

Surface Repair for AutoSHAFT

E33-673

The Surface Repair content is included in the Shaft Modeler Users Guide as Appendix G.

version 2017 release notes - avl notes tmexcite v2017 avl list gmbh hans-list-platz 1, a-8020 graz,...

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