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1. M.E. 462 Capstone DesignI.U.P.U.I. Spring 2007 Bishop Steering:
1970 Lotus Europa
Front Axle Re-design
Aaron Emmons
Phil Palmer
Brad Holtsclaw
Adam Spindler
Adam Douglas
4. IntroductionFixed Parameters Budget $3600
5” Ride Height
15” Wheels
5. Design Specifications Development Customer Requirement (right)
Top Three Requirements:
Safety
Minimizing Weight
Braking from 200mph
6. Engineering Specifications Ground Clearance of 5 inches
Weight Minimization (parts made of aluminum)
New Wheel (15” Audi Wheel)
Overall width (outside wheel to outside wheel) to remain the same Overall width – Distance from frame to remain the same
Braking Force to compensate for 1600lbs at 200+mph (Wilwood)
Rotor size increased (surface area increase for larger braking friction)
7. Engineering Specifications Cont. Hub size increased to compensate for 5-bolt Audi Wheel
Deflection of bearings minimized
Machining time increased due to no production line
Factor of Safety increased (keep Jason safe at 200 mph)
8. Competitive Benchmarks Minimization of Weight
Maintain Safe Operation Conditions
Stopping Vehicle going 200 M.P.H.+
9. Literature / Patents
14. Concept Evaluation Create
Overall concepts
Analyze
Using Concept Outline
Evaluate
Decision Matrix
16. Morphology
20. Concept Outline
22. Failure Modes Concept 1
Rotor
heat warping
Mechanical linkage for turning
Stress/fatigue in linkages and ball joints
Tapered bearings
Degradation due to heat and friction
Brake fluid w/ piston for stopping
Leaks/ air pockets in brake lines
Concept 2
Drums
Heat warping the drum
Foreign debris can enter the drum easily
Heat Exchanger
Fluid lines leaking
Corrosion
Mechanical linkage system for stopping
Stress/fatigue in linkages and pin joints
Knuckle w/ pin joints
Limited number of degrees of freedom
Cylindrical roller and thrust bearings
Degradation due to heat and friction
Pressurized fluid for turning
Fluid line leaks
24. Decision Matrix
25. Load Distribution Lexus V8 mounted in the rear
60% rear 40% front
1600 lb force on each front wheel with a
factor of safety = 5
35. Conclusion
Aluminum is a viable material for our design
By using F.E.A. structural design of parts will withstand all applied forces with a safety factor greater than 5.
At this time, 9 out of 12 Engineering Specifications have been met.
37. Acknowledgements Dr. Hazim El-Mounayri
Bishop Steering
IUPUI Dept. of Mechanical Engineering
38. Questions??