汽车乘坐舒适能仿真------外文翻译.docVIP

SIMULATION OF VEHICLE RIDE COMFORT PERFORMANCE?? IN ADAMS Peng Shuang, Song Jian State Key Laboratory of Automotive Safety and Energy, Tsinghua University, Post Code 100084 Beijing, China ABSTRACT ?? In ride comfort research, it is important to simulate the vibration of automobile on uneven road. To build a more accurately model, the nonlinear factors should be taken into consideration. In this paper, an uneven road with certain auto-PSD is generated in MATLAB software.In ADAMS software, a 126-DOF nonlinear ride comfort model is constructed and simulated on this irregular road. The results of simulation are converted into frequency domain, and compared with those of road tests. This method of ride comfort research is proved to be reliable and feasible. INTRODUCTION Ride comfort is one of the most important performances of vehicles. Simulation is a useful way for ride comfort research. When a vehicle is running on an uneven road, it will vibrate due to the irregularity of road. The transference of this vibration through suspension, body and seat to the human body is often studied in frequency domain according to the assumption that the vehicle is linear system. Given the road PSD (Power Spectral Density) and the transfer function matrix of the N degree of freedom model of linear vehicle system, the PSD and main square root of the response can be worked out by random vibration method [1]. This frequency domain approach is based on the linearity of the vehicle systems. Actually there are many nonlinear components in vehicle, such as the tire, damper, spring, bushing and so on. Because of the inexistence of the fixed frequency characteristic function for a nonlinear system, the frequency domain approach is not applicable. It cannot get accurate result. To simulate the vibration more accurately, nonlinear elements should be included in the model. This dynamical system can be described by state equations. But few of the state equations can be solved to put out an analyt