Dynamic Modeling And Simulation Of Vehicle Ride Comfort Based On Triaxial Vibrations Of Person-Chair System

Most of the evaluations to the vibration ride comfort of the vehicle only consider vertical vibration presently, and could not show the vibration from vehicle to body completely. After consulting the literature and references and summarizing past and current research outcome of the vehicle ride comfort, it is believed that three dimensional vibrations of person-chair should be taken into account in the simulation of vehicle ride comfort. A new kind of evaluating method is presented as the result of combining many kinds of methods in this paper.Analytical mechanics method is applied to establish the dynamic linear model. It is inferred to a differential equation set. To solve it, the differential equation set is transformed by Fourier transform and the dynamic differential equation in the form of matrix is educed. The calculation formulas of frequency response function of vehicle vibrating system, acceleration power spectrum density function are put forward. The influences of horizontal vibration and longitudinal vibration on ride comfort are valued.The random excitation of the four wheels is used as the input of this system. The changing rule of vertical displacement, three directions ofacceleration power spectrum density function of person-chair system of model CA-141 and etc. in the frequency domain is simulated using Matlab. The rationality of the model is analyzed and validated by comparing of relevant testing results and theoretic analysis. The influences of the change of the speed and main parameters of the vehicle on ride comfort are analyzed respectively. The ride comfort of three kinds of vehicle is evaluated. The superiority of riding evaluation based on triaxial vibration is demonstrated.