1. Steer-by-Wire Project Presentation Group 7 ME 462 Sponsor: Dr. Sohel Anwar Spring 2007 Donny Franzen Jimmy Huser Ugo Anyaorah Stephen Chittenden

2. Contents  Introduction  Customer Requirements  Design Targets  Design Changes  Modeling and Analysis  Analysis Results  Modeling – Machining  Completed Project – Demonstration  Acknowledgements

3. Introduction  Steer-by-Wire System No Mechanical Connection between steering column and the wheels of the vehicle Common practice in commercial airline industry  Convert rotational motion into electrical signal  Input electrical signal into motor for torque feedback Torque Feedback – return to center and future input of external stimulus (curb, pot-hole, etc.)  Installation into Bench Test System  Simulate Mechanical Steering response and feel  Portable & Easily Manipulated

4. Customer Requirements  Measure Turn Angle  Conventional Feel Torque Feedback End Stops Return-To-Center  Reliability  Quiet and Seamless Operation  Size  Maintenance  Safety  Cost

5. Design Targets  Lock-To-Lock: 1080 o  Angle Measurement Resolution: 0.5 o Redundancy: 3 Sensors  Torque Adjustable: 1-15 Nm Max (Endstop): 30 Nm  Return-To-Center Position: +/- 5 o Speed: 800 deg/sec (max)  Maximum Noise: 20 dB  Minimum Cycles to Failure: 10 million  Smooth Feel To User : 95%  Conventional Design Envelope: 510 in 3  Mean Time Between System Maintenance: 50K miles  Minor Cost Differential to Conventional System: $0

6. Design Changes  Sensors  Motor  End Stop  Envelope  Configuration  Ball Bearing Locations  Steve got engaged and Accepted to Law School

7. Modeling and Analysis  Highest Priority Stress Concerns in End Stop

8. Analysis Results  Results Positive for Proper Function Torque = 120 in. lb Force = 3000 lb Max Deflection = 0.0013 in Max Stress = 12 Ksi Yield Stress = 40 Ksi

9. Modeling  Machined Parts

10. Completed Project  System Demonstration

11. Special Thanks John Snodgrass Daniel Aw

12. Questions