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Vehicle Dynamics and Handling Feel
From Driver Perception to Beyond Center-of-Gravity Dynamics and Design Formulas
Vehicle Dynamics Theory
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.
Importance 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 motion 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.
Translation of Feedback into Parameters
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:
Phenomena and Formulas
1) yaw gain, 2) two-stage motion (delayed turning of the rear-end), 3) the pendulum motion 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.
Mechanisms and Formulas
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.
Intended Audience
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.
