摘要
建立了载货汽车五自由度平面振动力学模型,推导了系统矩阵形式的状态方程;利用Matlab/Simulink构造了随机激励路面输入,以驾驶座椅垂直加速度和悬架动位移为评价指标,仿真分析了空负荷、1/4负荷、1/2负荷、3/4负荷和满负荷五种负荷变化对载货汽车乘坐舒适性的影响。结果表明:随着装载量的增加,驾驶室垂直加速度和悬架动行程的功率谱密度波峰呈上升趋势,且当装载量为3/4负荷时,功率谱密度相较于其它负荷有所降低,说明此时在保证运输效率的同时,也有助于降低因路面冲击而引起的驾驶室振动,提高车辆的乘坐舒适性。
A five-degree-of-freedom plane vibration mechanics model of a truck was established,and a state equation in the form of a system matrix was derived;A random excitation road input was constructed using Matlab/Simulink,and the vertical acceleration of the driver’s seat and the dynamic displacement of the suspension were used as evaluation indicators for simulation analysis.The impact of five load changes,no load,1/4 load,1/2 load,3/4 load and full load,on the ride comfort of a truck is analyzed.The results show that with the increase of the load,the power spectral density peaks of the vertical acceleration of the cab and the suspension dynamic stroke show an upward trend,and when the load is3/4 load,the power spectral density decreases compared with other loads,Which shows that while ensuring transportation efficiency,it also helps to reduce the vibration of the cab caused by road impact and improve the ride comfort of the vehicle.
出处
《专用汽车》
2021年第11期58-61,共4页
Special Purpose Vehicle
