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FSAE Suspension

Team Members: Jarret Vian Bryan Rowley John Murray. ME 191 Final Presentation Spring 2009. FSAE Suspension. Outline. Introduction Re-Design Manufacturing Testing Conclusion. Introduction. Design Requirements. Minimum 60” wheel base Unequal front & rear track widths

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FSAE Suspension

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  1. Team Members: Jarret Vian Bryan Rowley John Murray ME 191 Final Presentation Spring 2009 FSAESuspension

  2. Outline • Introduction • Re-Design • Manufacturing • Testing • Conclusion

  3. Introduction

  4. Design Requirements • Minimum 60” wheel base • Unequal front & rear track widths • Minimum 1” ground clearance • Minimum 2” total suspension travel • Template must pass through frame • Spherical bearings must be in double shear • Design must handle applied loading Design Goal • Rate of camber angle change with respect to both body roll and wheel displacement

  5. Re-Design • Original • Final Design

  6. Manufacturing • Manufactured at CSUS, by FSAE team

  7. Manufacturing • A - Arms

  8. Bearing Holder • Hub & Spindle • Upright

  9. Geometry Testing • Wheelbase • Track Width • Camber • Caster

  10. Goals • Rate of camber angle change per degree body roll

  11. Rate of camber angle change per inch of wheel displacement

  12. Upright Testing • Strain Gages

  13. Strain Gage Installation • Degrease • Abrade • Burnish • Condition • Neutralize • M-Bond 200 • Solder • Connect to instrumentation

  14. Loading Scenario: 759lbs • Apply the load, and maintain a constant force on the tire • 139lbs, 300lbs, 400lbs • Read the strain from each channel on the instrumentation

  15. Strain  Stress

  16. Stress Extrapolation • Elastic

  17. FEA Stress Value • Rosette location • Probe

  18. Theoretical  Experimental • Sy = 50,800psi • Assumption: rigid • Assumption: smooth

  19. Future Testing Plans • Strain gauge and accelerometer data logged during driving • Mychron 3 data logger with internal Accelerometer • Strain gauges

  20. Conclusions

  21. Budget

  22. Lessons Learned • Engineering is challenging and rewarding • Never underestimate the scope of a project • Always test to verify assumptions

  23. Questions ?

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