非平稳行驶条件下重型汽车轮胎动载特性分析

为分析非平稳行驶条件下重型汽车轮胎附加动载特性、探讨与匀速平稳行驶工况下的差异,基于车辆行驶动力学理论,建立三轴重型汽车系统动力学模型和路面非平稳随机激励时域模型,采用MATLAB/Simulink软件仿真分析了车辆非平稳行驶条件下轮胎动载的响应规律,并与匀速平稳行驶条件下的分析结果进行比较。结果表明:车辆加速时轮胎动载荷幅值变大、减速时动载荷幅值减小;车辆等时通过同一段道路时,匀速平稳行驶时的动载荷较小;随着加速度、初速度和路面不平度的增加,动载荷幅值变大。研究结果可为精确模拟车辆轮胎动载荷、道路友好性分析和路面损伤破坏预测提供参考。

Tire dynamic load characteristics analysis of heavy vehicles under non-stationary running condition

In order to analyze additional tire dynamic load characteristics of heavy vehicles under non-stationary running condition,and explore the difference between the former and those under steady running condition,the dynamic model of a three axle heavy vehicle system and the road surface non-stationary random excitation time domain model were established based on the vehicle running dynamics theory.The vehicle response laws under non-stationary running condition and its tire dynamic load were simulated and analyzed with the software MATLAB/Simulink.The analysis results were compared with those under steady running condition.The results showed that when the vehicle is accelerating,tire dynamic load amplitude increases,when it is decelerating,the latter deceases;when the vehicle passing through the same path with the same time,i.e.,when it running at the steady uniform speed,tire dynamic load is smaller;with increase in acceleration,initial speed and road roughness,tire dynamic load amplitude becomes larger;the study results can provide a reference for accurate vehicle tire dynamic load simulation,road friendliness analysis and pavement damage and failure prediction.