Abstract: The coordinate transform was used firstly to establish a mathematical model for the vehicle ride comfort system. The input signals of the model were transformed into the acceleration signals of the front axle and the rear driving axle. Compared with the traditional vehicle ride comfort model, the calculation accuracy of the proposed model was improved and appeared more practical in engineering because of using the acceleration signal as input signal. The complicated tyres were separated by the equivalent transform which made the model more available. A vehicle ride comfort simulation model was established by means of software package matlab/simulink, and its complicated input parameters were discussed considering the stiffness of the flat spring and the nonlinearity of the damping. In order to validate the simulation model, the corresponding vehicle tests were performed. The comparison between the test data and the simulation curves showed that their agreement was quite good.

Key words: vehicle engineering, ride comfort model, mathematical model, coordinate transform, simulation analysis