The New Concept Car Comfort And Handling And Stability Studies,

This paper mainly aims at feasibility study of a new concept car both theoretically and experimentally. Comparisons are made between the ride comfort and handling characteristics of the new concept car and ordinary layout car. For the ride comfort research, this paper proposes a nonlinear ride comfort model with 11 DOFs including tyres, suspensions and seats. An algorithm for generating discrete road excitation in time domain is applied for the study. Neural network optimization method is used for calculation study of the suspension parameters. The study shows that the new concept car has better ride comfort than ordinary layout car. To examine the validity of theretical models, experiments are carried out with a typical suspension system and the results show that the nonlinear tyre and suspension model in ride comfort model is reasonable. An actual vehicle comfort test is also taken and it can be seen the new concept car does have a better ride comfort property. For the handling characteristics research, an opened ioop handling characteristics model is established. Comparison is made between the stability and dynamic responding ability of the new concept car and ordinary layout car both in time domain and frequency domain. Furthermore, a closed loop directional model based on the driver/road/vehicle dynamic optimal control is put forward and real time simulation of the whole steering ability is done for the new concept car and ordinary layout car. The calculation result also indicates that the handling characteristics of the two type cars is equivalent. The paper creatively brings forward the road excitation generating algorithm, the neural net~vork optimization algorithm and the driver/road!vehicle dynamic optimal control model. It also improves the nonlinear ride comfort and handling characteristics model. This study shows that the new concept car is undoubtedly feasible regarding the features discussed in this paper.