車路實(shí)驗(yàn)系統(tǒng)中車輛模型的動(dòng)力學(xué)分析及實(shí)驗(yàn)
[Abstract]:When a car is driving, the road roughness causes the vehicle vibration, which acts on the pavement structure and causes the road surface damage. Even some roads appear early damage after the road is put into use, thus exacerbating the vehicle vibration. Affect vehicle ride comfort and safety. Reducing the interaction force between the vehicle and the road surface and ensuring that the vehicle ride comfort can be improved within a certain reasonable range has become the focus of the vehicle road system dynamics research. In this paper, an experimental system of vehicle path model is constructed to analyze the dynamics of vehicle path system. The nonlinear vehicle model based on air suspension and tire stiffness characteristics and nonlinear man-vehicle vibration model are established. The main research contents and conclusions are as follows: (1) A vehicle-road model experiment system is designed to analyze vehicle response characteristics and vehicle-road interaction. The corresponding experiments are carried out. (2) the nonlinear vehicle model with two degrees of freedom is established, and the dynamic response characteristics of the model under sinusoidal and random pavement are obtained by simulation, and the speed of vehicle is studied. The influence of road roughness and vehicle parameters on vehicle dynamic load. (3) the bifurcation and chaos of nonlinear vehicle system with two degrees of freedom are studied from the angle of excitation frequency, road roughness and vehicle parameters. The analysis shows that there are bifurcation and subharmonic resonance phenomena, almost periodic, chaotic and hyperchaotic motion and other nonlinear response characteristics. (4) A nonlinear man-vehicle vibration model is established to analyze vehicle ride comfort. It is found that the evaluation of vehicle ride comfort by body acceleration is not comprehensive enough, and the ride comfort can be improved by changing the suspension and tire parameters. The comparison and analysis of the test results and the simulation results show that the experimental system can reflect the mechanical characteristics of the actual vehicle path, which provides a reference for the indoor experimental method to study the dynamic problems of the vehicle-road system. The results of this paper have certain theoretical significance and engineering application value.
【學(xué)位授予單位】:石家莊鐵道大學(xué)
【學(xué)位級(jí)別】:碩士
【學(xué)位授予年份】:2016
【分類號(hào)】:U467
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