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为了解决某车辆被动悬架系统中减振器由于温升过高而漏油失效的问题,提出了车辆悬架系统机械特性与其热学特性相互耦合的模型。采用MATLAB/Simulink建立闭环正反馈系统的热-机耦合模型,并通过仿真计算得到某车辆在多种工况以及不同悬架参数条件下减振器的温升特性曲线。研究结果表明:随着路面等级的下降、车速的提高、簧上质量的增大以及悬架刚度的减小,减振器的温度升高;车轮刚度对减振器温升特性影响较小;簧下质量对减振器温升特性无影响。
In order to solve the problem of oil spill failure due to excessive temperature rise of the shock absorber in a passive suspension system of a vehicle, a model is proposed in which the mechanical characteristics and the thermal characteristics of the vehicle suspension system are coupled with each other. The thermo-mechanical coupling model of the closed-loop positive feedback system is established by MATLAB / Simulink, and the temperature rise characteristic curve of the shock absorber of a vehicle under various working conditions and different suspension parameters is obtained through simulation. The results show that the temperature of shock absorber increases with the decrease of road surface grade, the increase of vehicle speed, the increase of sprung mass and the decrease of suspension stiffness. The effect of wheel stiffness on the temperature rise characteristics of shock absorber is small. The unsprung mass has no effect on the temperature rise characteristics of the shock absorber.