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 |  موضوع: مشروع تخرج بعنوان Design and Optimization of a SAE Baja Chassis الخميس 20 أكتوبر 2022, 2:04 am | |
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أخواني في الله
أحضرت لكم
مشروع تخرج بعنوان
Design and Optimization of a SAE Baja Chassis
A Major Qualifying Project Report
submitted to the Faculty of
WORCESTER POLYTECHNIC INSTITUTE
in partial fulfillment of the requirements for the
Bachelor of Science Degree
in Mechanical Engineering
By
Heather Selmer, ME
Sabbrin Shweiki, ME
Paige Tencati, ME
Date:
April 20th, 2017
Approved By:
Prof. David C. Planchard, Project Advisor
Prof. John R. Hall, Project Co-Advisor
و المحتوى كما يلي :
Table of Contents
Table of Figures 1
List of Tables 2
List of Equations 2
Nomenclature 3
Abstract 4
Acknowledgements 5
Introduction 6
Project Overview 6
SAE Overview 7
What is a Baja vehicle? 8
Background Research 9
Vehicle Subsystems 9
Frame 9
Suspension 10
Wheel Alignment 12
Methods and Procedure 18
Design Specifications 18
Design Analysis 19
Suspension System 19
Front Suspension Design 21
Rear Suspension Design 21
Transmission 22
Torque Goal 22
Frame 24
Design Iterations 24
Conclusion 41
Future Work and Suggestions 43Baja SAE 2016-2017
Appendices 44
Appendix A: Baja SAE Vehicle with Subsystems 44
Appendix B: Elongated Design Simulations 45
Appendix C: Final Design Simulation Reports 59
C1: Frontal Impact 1 59
C2: Frontal Impact 2 68
C3: Rear Impact 76
C4: Rollover 84
C5: Drop Impact 92
C6: Side Impact 100
C7: Top Impact 108
C8: Driver and Engine Drop 116
Works Cited 12
Table of Figures
Figure 1 Primary and Secondary Member Classification .10
Figure 2 Coil Over Shock Absorber .11
Figure 3 Air Shock Absorber .12
Figure 4 Camber angle 13
Figure 5 Caster 14
Figure 6 Toe configuration (as viewed from the top) 15
Figure 7 SAI / KPI .16
Figure 8 RIT’s 2016 Vehicle Showing Double A-Arm in the Front Suspension 20
Figure 9 Front suspension design 21
Figure 10 Rear Suspension Design 22
Figure 11 Free Body Diagram of Baja for Hill Climb Event 23
Figure 12 Rounded Square Nose Model of First Frame Design .24
Figure 13 Rounded Square Nose Model Front Impact Four Points Static Force Simulation and Stress
Key .26
Figure 14 Square Nose Model Close-up of Front Impact Four Points Static Force Simulation 27
Figure 15 Rounded Bottom Nose Frame Design .27
Figure 16 Rounded Bottom Nose Model Front Impact Four Points Static Force Simulation and
Stress Key .28
Figure 17 Rounded Bottom Model Close-up of Front Impact Four Points Static Force Simulation 28
Figure 18 Welded Square Nose Model Frame Design .29
Figure 19 Welded Square Nose Model Front Impact Four Points Static Force Simulation and Stress
Key .30
Figure 20 Welded Square Nose Model Front Impact Two Points Static Force Simulation and Stress
Key .30
Figure 21 Welded Square Nose Model Modified .31
Figure 22 Elongated Welded Square Nose Model .31
Figure 23 Elongated Welded Square Nose Model Front Impact Four Points Static Force Simulation
and Stress Key 32
Figure 24 Elongated Welded Square Nose Model Front Impact Two Points Static Force Simulation
and Stress Key 32
Figure 25 Elongated Frame Design with Front Tabs 33
Figure 26 Percy and C10 .34
Figure 27 Front Impact Simulation .35
Figure 28 Front Bottom Impact Simulation .35
Figure 29 Rollover Simulation .36
Figure 30 Rear Impact Simulation 36
Figure 31 Top Impact simulation 37
Figure 32 Drop Impact Simulation 37
Figure 33 Northeastern Baja tabs .39
Figure 34 Initial tab models 40
Figure 35 MQP's Northeastern style tab .40
Figure 36 Variable tab model 41Baja SAE 2016-2017
Page 2 of 125
List of Tables
Table 1 Nomenclature . 3
Table 2 Male/Female Driver Parameters . 19
List of Equations
Equation 1 Torque 23
Equation 2 Maximum force . 25
Equation 3 Factor of safety and applied force
Nomenclature
Table 1 Nomenclature
Symbol Name Unit
Center of mass
m Mass kg
g Gravitational acceleration m/s2 (9.81 m/s2)
gx Gravitational acceleration in the x (horizontal)
component m/s2
gy Gravitational acceleration in the y (vertical)
component m/s2
a Acceleration m/s2
t Time s, seconds
W Weight N (Newtons)
T Torque (rotational force in mechanics) N·m
D Diameter m, meter
r Radius m
Ff Force of friction N
FN Normal force N
Fw Force of work (force put by the engine, etc.) N
θ Angle ° (degrees)
hp Horsepower hp = 746 W (Watts)
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