Simulation And Control On Vehicle Dynamic Response To Tire Blow-out

It is very dangerous that a high-speed car happens to blow out. In order to reduce theharm caused by the tire-burst car, this paper analyzes vehicles’ dynamic responses andsummarizes their common features, and then strategies from the prospective of activesuspensions are proposed to control the tire-burst cars and their vertical loads on tires toimprove their handling and stability. This dissertation consist of the following parts.Firstly, a burst tire model based on UniTire model has been established;Secondly, vehicles’ dynamic responses to tire burst are analyzed by co-simulation ofsoftware CarSim and Matlab/Simulink, and then their common features are summarized;Thirdly, mathematical models for a vehicle with a blown-out tire are developed to studythe characteristics of tires’vertical load, based on the full automobile model with7degrees offreedom. Then, a simulation based on these models is executed to analyze the redistribution oftires’vertical loads after tire burst and the redistribution can seriously impact the handling andstability of the tire-burst car. In order to obtain tires’ optimal mechanical performance for thehandling and stability control of the tire-burst car, a strategy depending on active suspensionsis proposed to control each tire’s vertical load and four PID controllers are used to adjust thedynamic response performance. The simulation results show that the tires’ vertical loadcontrol system has good performance in damping each tire’s dynamic oscillation andregulating their steady-state to desired sizes.Finally, a strategy based on active suspensions is proposed to control the tire-burst car.With each active suspension adjusting the height of corresponding side of the vehicle body,the attitude of the vehicle body can be controlled along with four active suspensions and thenwheels’ alignment parameters and forces on each tire change accordingly. Eventually balanceof the tire-burst car can be restored. Simulation results show that this control strategy cansignificantly improve the handling and stability of the tire-burst car both in the state ofrunning and in the process of braking, and so that the tire-burst car is kept in control.