Papers by Author: Lin Liu

Abstract: In this paper, motion differential equation of the two degrees of freedom (2-DOF) vehicle is established based on the linear two degrees of freedom vehicle model and is derived without simplifying the front wheel steering angle (FWSA), then we analyze the vehicle's steady-state response , transient response and the amplitude-frequency characteristic of yaw velocity under different FWSA with the help of the matlab software and finally compare the results with the simplified ones to determine how the FWSA influences the level of the vehicle handling and stability (VHS). The results show that: while the FWSA is small, it has a less influence on vehicle handling and stability, the FWSA is large, it has a greater influence on vehicle handling and stability.

Abstract: In this paper, the theory of DR (Delayed Resonator) is employed to investigate the vibration of vehicles, for the first time, and the process to suppress the vibration transmission from the engine to the body using the DR is explored. A simplified half-car model with DR is built for the case of idling, and the critical time delay is obtained by analyzing the stability of the model, additionally, the different effect of the parameters on the stable region is investigated. Method of solving the optimum values of the gain and the delay for maximum vibration suppression is built, afterwards numerical emulation is carried out to check the effect and to compare with the hydraulic engine mount. The results show that the amplitude of the body can be reduced more effectively.