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为改善车辆不同作业环境下的操控性能,防止地域及季节气温差异导致转向系动态响应偏离其设计初衷,该文以非独立悬架车辆为例,对考虑温度效应的车辆摆振系统动力学行为进行了分析。基于热弹性力学考察了温度效应对转动副间隙的影响,建立了计入温度效应的转向传动机构含间隙车辆摆振系统动力学模型。通过数值算例分析了某1030货车摆振响应的分岔特性和初值特性,讨论了车速、温度等参数对摆振系统全局动力学行为的影响,研究表明,温度的改变在85～110km/h车速区间内会导致转向轮摆角周期运动形态的改变,且这种影响在高车速区段下比中低车速区段更为明显,而当车速为100km/h、温度为-40℃时左转向轮摆角中值为负,意味着有向右跑偏趋势;50℃时摆角中值由负变正,说明有改为向左跑偏的趋势。研究结果可为全天候车辆防摆振设计提供参考。
In order to improve the vehicle handling performance in different operating environments and prevent the dynamic response of the steering system deviating from its original design due to the difference of the region and the seasonal air temperature, this paper takes a non-independent suspension vehicle as an example to study the dynamic behavior of the vehicle shimmy system considering the temperature effect. Analyzed. Based on the thermoelasticity theory, the effect of temperature on the clearance of the rotor was investigated, and the dynamic model of the shimmy system of the steering system with the clearance included in the temperature effect was established. The bifurcation characteristics and initial value characteristics of a 1030 truck were analyzed by numerical examples. The effects of vehicle speed, temperature and other parameters on the global dynamic behavior of the shimmy system were discussed. The results show that the temperature changes are between 85 ~ 110km / h speed range will lead to changes in the steering cycle of the steering wheel, and this effect is more obvious in the high speed section than in the middle and low speed section. When the speed is 100km / h and the temperature is -40 ℃ The negative value of the left steering wheel swing angle means that there is a trend of deviation to the right; the median of the swing angle changes from negative to positive at 50 ° C, indicating a trend of shifting to the left. The results of the study can provide a reference for all-weather vehicle anti-shimmy design.