Generation of virtual road surfaces and simulation of nonlinear vibration of vehicles

It is very important to predict the random vibration of vehicles by simulation techniques. To study the vibration of a vehicle running on an uneven road more accurately, nonlinear factors have to be taken into account. In this case, frequency domain methods would not be applicable. A method, which makes use of a digital filter system to generate a virtual road surface according to the statistical properties of a target road surface, is introduced. Under the help of the MSS (mechanical system simulation) code ADAMS, a nonlinear vibration model of the vehicle was built. On the basis of these, by using the virtual road surface as the input of the vehicle, the random vibration of the vehicle was simulated in the time domain and the results of simulation were analyzed.