Transcript Steer-by-Wire System Gear Box Design

Steer-by-Wire System
Gear Box Design
Elizabeth Dick, Vijay Patel, Trish Pham,
Breanne Walters, Josh Collins
Dr. Sohel Anwar-Project Sponsor
FALL 2007
Presentation Outline
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Project Goal
Background
Customer required criteria
Motor Selection
Final Model
Model Analysis (Static and Dynamic)
Conclusion
Recommendations for the future
Acknowledgements
Questions
Project Goal
•Convert rack and pinion system to operate two
motors for steer-by-wire steering system
Current Motor
Interface
Background
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Power Steering
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Steer-by-Wire
Customer Design Criteria
Force to move to rack [N]
5000/4000
Functionality [%]
100/75
Redundancies
2/1
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
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Motor Requirement
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Selected Motor
Motor Performance Requirements
2 Nm Continuous
Torque
3 Nm Max.
Input Signal
PWM
Speed
2500 rpm Max.
Current
20 A Max.
Voltage
80 V Max.
Power
1 hp
2.5 Nm Continuous, 8Nm Max.,
2500 rpm, 10.3 A, 80 V, 1.7 hp
Final Model Design
Static Analysis
Dynamic Analysis
0.098425 [m], shaft length
Shaft connecting
Gearbox w/
Rack and Pinion
Ø.03 [m],
shaft dia.
1:1 Gear
Ratio
2 plcs
Servo Motor
1.5 [N m]
Torque
2 plcs
Product Evaluation
Summary
Note
Backlash and
Noise Level
Pending
Prototype
Build
Conclusion
Recommendations for the
Future
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Project turn-over
Design goals and customer design
criteria need to be defined clear
Communication
Acknowledgements
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Dr. Sohel Anwar – Project Sponsor
Dr. Jie Chen – Project Advisor
Wei Nu – Graduate Student
Daniel Aw – Graduate Student
Brian Neel – Mechanical Electrical
Systems
Questions?