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Full Description
In this book, Sakai provides a comprehensive vehicle dynamics theory that enables engineers to apply drivers' subjective evaluations of car handling to corresponding vehicle motion equations to develop and ensure engaging and dependable handling characteristics.
In the automobile market, vehicle dynamics is a leading parameter by which a car is judged and rated in comparison to competing models. Magazine test-drive reviews describe vehicle dynamics using terms such as "two-phase yaw motion," "the pendulum effect of the rear-end," "feedback," and "vertical body control" and refer to the level of grip and handling engagement. Similarly, test drivers provide feedback on car handling using similar terminology. It is therefore necessary for car designers to translate this feedback into quantifiable parameters using appropriate equations. As this feedback usually relates to ten phenomena, this book provides the relevant formulas for these. They include: 1) yaw gain, 2) two-stage motion (delayed turning of the rear-end), 3) the pendulum effect of the rear-end, 4) transmission of vehicle behavior information to steering reaction torque, 5) steering wheel and vehicle response to steering torque input, 6) steering operability in quasi-static maneuvers, 7) roll angle, 8) the dynamic rolling center during driving, 9) illusory pitch and jacking effects in steady cornering, and 10) turn-in feel based on illusory roll-pitch timing. Throughout, the mechanisms by which these phenomena occur and their formulas' physical meanings are also explained. Formulas in this book are simplified from traditional models by normalizing the yaw inertia and tire characteristics.
This book is an indispensable resource for engineers working in industry, whether at automobile manufacturers or related suppliers, to design engaging handling based on both mathematical equations and driver feedback.
Contents
1. Introduction: Systematic Framework for Handling Development with Focus on Emotional Response Using Vehicle Dynamics SECTION 1: Vehicle Model and Fundamental Cornering Characteristics 2. Steady-State Cornering and Static Vehicle Model (Basis Property 1: Cornering Feel 1) 3. Dynamic Cornering Response SECTION 2: Basis Properties That Define Handling Characteristics 4. Vehicle Rear-End Response (Basis Property 2: Cornering feel 2) 5. Vehicle Rear-End Pendulum Motion (Basis Property 3: Cornering Feel 2) 6. Rear-end Response Felt through the Steering Wheel (Basis Property 4: Steering Feel 1) 7. Steering wheel angle lag in response to torque input (Basis Property 5: Steering Feel 2) 8. Steering Operability in Quasi-Static Maneuvers (Basis Property 6: Steering Feel 3) 9. Static Roll Angle and Dynamic Roll Response (Basis Properties 7 and 8: Roll Feeling 1 and 2) 10. Pitch and Jacking Motions Induced by Cornering (Basis Properties 9 and 10: Cornering Feel 3 and 4) SECTION 3: Stability Properties to Be Considered in Design 11. Lift-Off Stability (Stability Property 1) 12. External Disturbance Stability (Stability Properties 2 and 3) 13. Limit Cornering Stability (SPs 4-7) SECTION 4: Fundamental Vehicle Layouts Enabling Sports Driving 14. Limits of Cornering Performance in Sports Driving SECTION 5: Vehicle Design for Optimal Handling and Stability 15. Design Strategies for Enhanced Handling and Stability. Appendix A: Mechanistic Interpretation of Tire Forces Using the Brush Model. Appendix B: Driver Model to Follow Roads
