空气悬架大客车行驶平顺性的计算机仿真及试验研究-空气悬架大客车行驶平顺性的计算机仿真及试验研究.rar下载

空气悬架大客车行驶平顺性的计算机仿真及试验研究-空气悬架大客车行驶平顺性的计算机仿真及试验研究.rar 空气弹簧悬架具有变刚度刚度小振动频率低车身高度不变等优点随着高速公路的发展显得更加突出目前空气弹簧悬架的性能研究越来越受到汽车技术人员的重视 本文建立了黄海DD6115H型大客车的五*度的动力学模型和数学模型并使用MATLAB软件及其SIMULINK模块对其行驶平顺性进行了仿真分析模拟出了B级路面得出了模型在随机激励下前后桥前后轴上方底板前轴上方座椅处的加速度自功率谱密度和均方根值同时根据国标GB/T 49701996汽车平顺性随机输入行驶试验对样车进行了行驶平顺性道路试验得出了对应点的加速度自功率谱密度和均方根值将试验结果与仿真结果对比验证了模型的可行性并对整车的行驶平顺性进行了分析评价同时通过改变模型的参数对改善实车的平顺性提出了一些建议 最后本文提出了下一步工作要解决的问题 关键词：空气悬架 行驶平顺性 SIMULINK 自功率谱密度 均方根值 Summary The air spring suspension takes on many virtues, for example, its stiffness is variable and vibration frequency is low, and when operation, the body height remains constant. And now, more and more engineers pay attention to studying the performance of this kind of suspension. In this thesis, both a kinetic model and a mathematical model of 5 DOFs are built according to HuangHai Bus DD6115H. The software MATLAB and its toolbox SIMULINK are used to build the road surface ranked Grade B ,and simulate and analyze the bus’s ride comfort. Then we obtain the 5 DOFs’ accelerations’ PSD and RMS, here, 5 DOFs respectively are front shaftrear shaftfloor boards above the front shaft and rear shaft, and the chair above the front shaft. At the same time, according to the national criterion The Vehicle’s Ride Comfort Under Random Input ,we carry out road test on the vehicle ride comfort, and obtain corresponding accelerations’ PSD and RMS. Then compare the test results with the simulation results, evaluate the feasibility of the model and the vehicle’s ride comfort. At last, by changing the model’s parameters, we put forward some advice on improving ride comfort. Finally, we put forward some questions to solve in following days. Key words: air spring suspension, ride comfort, SIMULINK, PSD, RMS.