Abstract
Considering human body vertical motion, vehicle body vertical motion, pitch movement and vertical jump of front and rear wheels, a five-degree-of-freedom vehicle model is established to study basic driving characteristics of the vehicle. Using Fourier transform method, acceleration power spectral density of the seat and the mean square value curves of seat vertical weighted acceleration are obtained by numerical simulation. Combined with comfort provision standards, the influence of vehicle model parameters and speed on seat acceleration power spectral density and vertical root-mean-square value of seat weighted acceleration are analyzed. Results show that the stiffness and damping of the seat have no significant effect on seat acceleration power spectral density, and seat acceleration PSD increases with increasing front or rear suspension stiffness, but it decreases with increasing front or rear suspension damping. It should also be concluded that the model stiffness and the mean square value of seat vertical weighted acceleration present positive correlation in general, but seat vertical weighted acceleration decrease first and then increase when model damping increase. Such analysis results can provide reference for the parameter optimization design of the automobile.
Highlights
Vehicle ride comfort is a major aspect of evaluating vehicle comfort properties
Jie Li found a kind of new method used for analyzing random vibration of vehicles [6]. Those studies did not analyze the effect of model parameter values on seat acceleration PSD and seat vertical root-mean-square value of weighted acceleration
A 5-DOF vehicle vibration model which stochastic road surface excitation is conducted as the main source of vehicle vibration is established in this paper, and the ride comfort of the passengers is analyzed by frequency-domain simulation
Summary
1/4 three degrees of freedom vehicle model does not take into account body pitching motion, vehicle sports performance does not reflect fully [1]. Jie Li found a kind of new method used for analyzing random vibration of vehicles [6]. Those studies did not analyze the effect of model parameter values on seat acceleration PSD and seat vertical root-mean-square value of weighted acceleration. A 5-DOF vehicle vibration model which stochastic road surface excitation is conducted as the main source of vehicle vibration is established in this paper, and the ride comfort of the passengers is analyzed by frequency-domain simulation
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