2006-2007 mae 461/462 machine design project€¦ · microsoft powerpoint - hovercraft...
TRANSCRIPT
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2006-2007 MAE 461/462Machine Design Project
Michael ColemanWill GoodrumMarc HeiselMark HopkeArthur OrtonJohan YavariLuke Scruby
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OUTLINE
IntroductionControlsLift & SkirtThrustChassisConclusion
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INTRODUCTION: HISTORY
2005/2006 →hovercraft selected
Built, some issuesTruncated timetableFlew, some issues
2006/2007 →hovercraft continued
Concept onlyMajor revisions
QuickTime™ and aTIFF (Uncompressed) decompressor
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QuickTime™ and aTIFF (Uncompressed) decompressor
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IMAGE: http://www.hovpod.com/images/images.html
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PROJECT ORGANIZATION
ChassisChassis ControlsControls LiftLift ThrustThrust
Luke ScrubyLuke Scruby
Josh HeimJosh Heim
Marc HeiselMarc Heisel
Johan YavariJohan Yavari
Alex SohnAlex Sohn
Mike ColemanMike Coleman
Will GoodrumWill Goodrum
Mike JonesMike Jones
James ClarkeJames Clarke
Nate GradyNate Grady
Brady BoltonBrady Bolton
Eric ZettervallEric Zettervall
Ryan O’GradyRyan O’Grady
Mark HopkeMark Hopke
Drew MichelottiDrew Michelotti
Matt FedericiMatt Federici
Dave AdelmanDave Adelman
Jon KassoffJon Kassoff
Arthur OrtonArthur Orton
Evan Van NessEvan Van Ness
Trevor WesolowskiTrevor Wesolowski
CFO: Johan Yavari
CFO: Johan Yavari
COO: Jonathan Kassoff
COO: Jonathan Kassoff
CTO: Trevor Wesolowski
CTO: Trevor Wesolowski
CIO: Mike Coleman
CIO: Mike Coleman
CEO: Will GoodrumCEO: Will Goodrum
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CONTROLS: CONCEPT & ANALYSIS
Allow for complete fly-by-wireProvide safety features to pilot and bystandersInterface with all other groups’ componentsRedundancies in event of component failureProvide an easy to use console
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CONTROLS: CONCEPT & ANALYSIS
Use modeling to determine forces, torques, and velocity
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CONTROLS: DESIGN & TESTING
Select pre-designed components, when possible
Design components according to model
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CONTROLS: DESIGN & TESTING
Testing includes verification of metrics of performance and specificationsPrimarily bench testing of systemFunctionality testing after installedElectrical system tests for fuses and kill switches
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LIFT & SKIRT: CONCEPT & ANALYSIS
Anything flat plate will hoverSkirt provides functionality
Three primary types of skirtsBagBag and Finger SkirtJupes
Selected a bag skirt designConsidered terrain Craft’s purpose
Image Source: http://www.australianhovercraft.com/design_skirts.htm
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LIFT & SKIRT: CONCEPT & ANALYSIS
Fan generates 4.5 in water pressure riseRequired craft profile confirmed
Chamfered cornersBottom edge chamfered Lift Fan and engine placement
Finalized total craft weight (750lbs)
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LIFT & SKIRT: DESIGN & CONSTRUCTION
Skirt18 oz vinyl coated nylonSewing outsourcedInstalled by wrapping around ½ inch tubing
Lift fanEngine placementSupport structureFan duct
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LIFT & SKIRT: LIFT FAN ASSEMBLY
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LIFT & SKIRT: DESIGN & CONSTRUCTION
OrificesPaper and Pencil vs. Cosmos Flow WorksLift fan opening = 10% of lift fan shroudTwenty 3.5 inch
diameter orifices
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LIFT & SKIRT:
Fuel system – integrated design
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THRUST: CONCEPT & ANALYSIS
42” diameter, 36” pitch propeller 10 HP engineBelt driveSquare steel tubing and plywood frameFiberglass rudders
Final 2005-2006 Design
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THRUST: CONCEPT & ANALYSISPROPULSION
Must meet hill climb spec, maximum speed spec Propeller vs. ducted fan
0
5
10
15
20
25
30
35
40
5 10 15 20 25 30 35 40 45 50
Velocity (mph)
Shaf
t Pow
er (H
P)
800 mm900 mm1000 mm
Propeller AnalysisPropeller Selector softwarePropeller theory and equations
Ducted Fan AnalysisFan theory and curves
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THRUST: CONCEPT & ANALYSIS
STEERING:Must meet turning rate specificationRudders vs. vectored thrustFlat plate vs. airfoil rudders
Analysis:FloWorks CFDVaried rudder height, length, airfoil shapeObserved lateral force produced, resulting angular acceleration
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THRUST: DESIGN & CONSTRUCTION
PropulsionDucted fan selected
RudderFlat plate selected36 inches tall (diameter of duct)24 inches long
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THRUST: CONCEPT & ANALYSIS
Modular designContains thrust mechanismContains steering control surfaces
Interfaces withChassis mountsControls for manipulation of control surfaces
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THRUST: DESIGN & CONSTRUCTION
Final Design26 HP Rotax 27736” fanGlass ductFlat plate ruddersSteel frameWooden ribs
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CHASSIS: CONCEPT & ANALYSIS
•Square Steel Tubing with ½” plywood deck
•407 lbs
•5.5’ x 12.5’
Final 2005-2006 Design
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CHASSIS: CONCEPT & ANALYSIS
Fall 2006 Proposed Design
Geometric Constraints
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CHASSIS: CONCEPT & ANALYSIS
•¼” plywood bulkheads
•5.2mm plywood deck
•1”x3” pine stringers
•17 oz 45-45-chop fiber
•Polyester resin
•Wax surface coat
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CHASSIS: CONCEPT & ANALYSIS
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CONCLUSION
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QUESTIONS?