Elizabeth Dick, Vijay Patel, Trish Pham,Elizabeth Dick, Vijay Patel, Trish Pham,Breanne Walters, Josh CollinsBreanne Walters, Josh Collins

Dr. Sohel Anwar-Project SponsorDr. Sohel Anwar-Project SponsorFALL 2007FALL 2007

Steer-by-Wire System Steer-by-Wire System Gear Box DesignGear Box Design

Presentation OutlinePresentation Outline

Project GoalProject Goal BackgroundBackground Customer required criteriaCustomer required criteria Motor SelectionMotor Selection Final ModelFinal Model Model Analysis (Static and Dynamic)Model Analysis (Static and Dynamic) ConclusionConclusion Recommendations for the futureRecommendations for the future AcknowledgementsAcknowledgements QuestionsQuestions

Project GoalProject Goal

•Convert rack and pinion system to operate two motors for steer-by-wire steering system

Current Motor Interface

BackgroundBackground

Steer-by-WireSteer-by-Wire Power SteeringPower Steering

CustomerCustomer Design Design CriteriaCriteria

Force to move to rack [N]Force to move to rack [N] 5000/40005000/4000

Functionality [%]Functionality [%] 100/75100/75

RedundanciesRedundancies 2/12/1

Motor response time [ms]Motor response time [ms] 85/10085/100

Deflection during actuation [degrees]Deflection during actuation [degrees] 0.5/0.60.5/0.6

Clearance [in]Clearance [in] 0.5/00.5/0

Functionality during single point failure Functionality during single point failure [%][%]

100/90100/90

Backlash [in]Backlash [in] 0.25/10.25/1

Noise level [db]Noise level [db] <50/>65<50/>65

Suitable for laboratory Suitable for laboratory 100/85100/85

Distance from bottom of fixture [in]Distance from bottom of fixture [in] >3/<2>3/<2

Weight [lb]Weight [lb] <40/>50<40/>50

Volt [V]Volt [V] <80/>80<80/>80

Motor SelectionMotor Selection

Motor Motor RequirementRequirement

Selected MotorSelected Motor

Torque2 Nm Continuous3 Nm Max.

Input Signal PWMSpeed 2500 rpm Max.Current 20 A Max.Voltage 80 V Max.Power 1 hp

Motor Performance Requirements

2.5 Nm Continuous, 8Nm Max.,

2500 rpm, 10.3 A, 80 V, 1.7 hp

Final Model DesignFinal Model Design

Static AnalysisStatic Analysis

Dynamic AnalysisDynamic Analysis0.098425 [m], shaft length

Ø.03 [m], shaft dia.

1:1 Gear Ratio

2 plcs

Servo Motor1.5 [N m]Torque2 plcs

Shaft connectingGearbox w/Rack and Pinion

Product Evaluation Product Evaluation SummarySummary

Note

Backlash and Noise

Level Pending

Prototype Build

ConclusionConclusion

Recommendations for Recommendations for the Futurethe Future Project turn-overProject turn-over Design goals and customer Design goals and customer

design criteria need to be defined design criteria need to be defined clearclear

CommunicationCommunication

AcknowledgementsAcknowledgements

Dr. Sohel Anwar – Project SponsorDr. Sohel Anwar – Project Sponsor Dr. Jie Chen – Project AdvisorDr. Jie Chen – Project Advisor Wei Nu – Graduate StudentWei Nu – Graduate Student Daniel Aw – Graduate StudentDaniel Aw – Graduate Student Brian Neel – Mechanical Electrical Brian Neel – Mechanical Electrical

SystemsSystems

Questions?Questions?