race car steering redesign group 6: joseph haydu joseph haydu brian quinn brian quinn noelle...
TRANSCRIPT
Race Car Steering Race Car Steering RedesignRedesign
Group 6:Group 6: Joseph HayduJoseph Haydu Brian QuinnBrian Quinn Noelle BombergerNoelle Bomberger Assisted byAssisted by
Jim WatermanJim Waterman
Advisor:Advisor: Jan Nazalewicz, P. E. Jan Nazalewicz, P. E.
OverviewOverview
ObjectivesObjectives Optimized designOptimized design Give future group head start in Give future group head start in
competitioncompetition DeliverablesDeliverables
Reports and Presentations for ME 424Reports and Presentations for ME 424 Final design and AnalysisFinal design and Analysis Fabricated steering systemFabricated steering system
Analysis of Previous Analysis of Previous SystemSystem
Geometry did not comply to Geometry did not comply to Ackermann EquationsAckermann Equations
System became mis-aligned System became mis-aligned regularlyregularly
Investigated quick release Investigated quick release mechanismmechanism
Ackermann EquationsAckermann Equations
R = (B/2) + [L / tan(R = (B/2) + [L / tan(ααinin)])]
ααoutout= ArcTan{ 1/ = ArcTan{ 1/ [(B/L)+(1/Tan([(B/L)+(1/Tan(ααinin))] }))] }R - Radius of Turn
B - Distance between front and rear axle
L - Distance to convergent point of steering linkages
αin - Angle of inside wheel turn
αout - Angle of outside wheel turn
Steering SystemSteering System
Steering WheelSteering Wheel Quick ReleaseQuick Release Steering ColumnSteering Column Rack and pinion GearingRack and pinion Gearing Steering LinkagesSteering Linkages
Turning PerformanceTurning Performance InputsInputs
Total car weight (W) = 815 lbfTotal car weight (W) = 815 lbf Height of car Center of Gravity from road (h) = Height of car Center of Gravity from road (h) =
1.5 ft1.5 ft Distance between wheels on axles (wb) = 3.92 ftDistance between wheels on axles (wb) = 3.92 ft Coefficient of friction for wheels is 1Coefficient of friction for wheels is 1 Information from Ackerman EquationsInformation from Ackerman Equations Assumed weight distribution even between front Assumed weight distribution even between front
and rear axlesand rear axles Outputs ConditionsOutputs Conditions
Car tippingCar tipping Sliding sidewaysSliding sideways
New Design AnalysisNew Design Analysis
Ackermann AnalysisAckermann Analysis
Old Design AnalysisOld Design Analysis
Linkage SpecificationsLinkage Specifications
Rack and pinion in front of axleRack and pinion in front of axle Ackermann SteeringAckermann Steering Minimize fabrication for maximum benefitMinimize fabrication for maximum benefit Analyzed model through SolidWorks to Analyzed model through SolidWorks to
minimize error from Ackermann minimize error from Ackermann EquationsEquations
Final Decision: Construct and test new Final Decision: Construct and test new linkageslinkages
Quick Release GoalsQuick Release Goals
Minimize time for driver to exit vehicleMinimize time for driver to exit vehicle Difficult to false triggerDifficult to false trigger Ease of useEase of use ErgonomicsErgonomics
Final decision: not sufficient Final decision: not sufficient improvement over existing design to improvement over existing design to warrant constructionwarrant construction