Elizabeth Dick, Vijay Patel, Trish Pham, Breanne Walters, Josh Collins Dr. Sohel Anwar-Project Sponsor FALL 2007 Steer-by-Wire System Gear Box Design

Presentation Outline Project Goal Project Goal Background Background Customer required criteria Customer required criteria Motor Selection Motor Selection Final Model Final Model Model Analysis (Static and Dynamic) Model Analysis (Static and Dynamic) Conclusion Conclusion Recommendations for the future Recommendations for the future Acknowledgements Acknowledgements Questions Questions

Project Goal Convert rack and pinion system to operate two motors for steer-by-wire steering system Current Motor Interface

Background Steer-by-Wire Steer-by-Wire Power Steering Power Steering

Customer Design Criteria Force to move to rack [N] 5000/4000 Functionality [%] 100/75 Redundancies2/1 Motor response time [ms] 85/100 Deflection during actuation [degrees] 0.5/0.6 Clearance [in] 0.5/0 Functionality during single point failure [%] 100/90 Backlash [in] 0.25/1 Noise level [db] <50/>65 Suitable for laboratory 100/85 Distance from bottom of fixture [in] >3/<2 Weight [lb] <40/>50 Volt [V] <80/>80

Motor Selection Motor Requirement Motor Requirement Selected Motor Selected Motor 2.5 Nm Continuous, 8Nm Max., 2500 rpm, 10.3 A, 80 V, 1.7 hp

Final Model Design

Static Analysis

Dynamic Analysis [m], shaft length Ø.03 [m], shaft dia. 1:1 Gear Ratio 2 plcs Servo Motor 1.5 [N m] Torque 2 plcs Shaft connecting Gearbox w/ Rack and Pinion

Product Evaluation Summary Note Backlash and Noise Level Pending Prototype Build

Conclusion

Recommendations for the Future Project turn-over Project turn-over Design goals and customer design criteria need to be defined clear Design goals and customer design criteria need to be defined clear Communication Communication

Acknowledgements Dr. Sohel Anwar – Project Sponsor Dr. Sohel Anwar – Project Sponsor Dr. Jie Chen – Project Advisor Dr. Jie Chen – Project Advisor Wei Nu – Graduate Student Wei Nu – Graduate Student Daniel Aw – Graduate Student Daniel Aw – Graduate Student Brian Neel – Mechanical Electrical Systems Brian Neel – Mechanical Electrical Systems

Questions?