路面随机输入时域仿真及试验分析  

Time-domain model simulation and experimental analysis of road stochastic inputs of vehicle

作　　者：于斌 张军伟[1] 李陆浩[1] 左霞[1] 郭文天 王国业[2] Yu Bin;Zhang Junwei;Li Luhao;Zuo Xia;Guo Wentian;Wang Guoye(Beijing Institute of Space Launch Technology,Beijing,100076,China;College of Engi)

机构地区：[1]北京航天发射技术研究所,北京市100076 [2]中国农业大学工学院,北京市100083

出　　处：《中国农机化学报》2020年第11期75-82,共8页Journal of Chinese Agricultural Mechanization

基　　金：国家自然科学基金项目(51605020)。

摘　　要：为得到路面随机输入时域模型,将滤波白噪声与传递函数结合对四轮路面时域模型进行推导,并利用优化算法求得各相关系数;利用MATLAB/Simulink软件搭建了四轮路面仿真模型,利用频谱分析法对仿真结果进行分析,结果表明仿真数据满足车辆随机振动的输入要求。搭建路面不平度测量仪器,对试验路面进行测量和路面等级识别,并将实测数据导入仿真模型分析,结果表明系统具有较好稳定性;将路面仿真结果与实测结果进行分析可得,前后轮迹拟合直线频率指数相同,左右轮迹拟合直线频率指数相差仅为0.059,实测路面较仿真路面的拟合直线频率指数最大误差为0.248,表明在关注空间频率范围内,仿真与实测路面PSD的拟合直线偏差较小,模型能够较好反映路面的不平度信息。In order to obtain the stochastic input time-domain model of road,the method of combining band-limited white noise with second-order transfer function was used to derive the model.The correlation coefficients of each simulation model were obtained using an optimization method.A road stochastic-input time-domain simulation model was built using MATLAB/Simulink software.Following the simulation,the results were analyzed using a spectrum analysis method.The results indicate that the simulation data generated by the model meet the requirements of random vibrations of vehicles.A road-roughness measuring instrument was built,and the simulated road was measured.The simulation system is proved as being stable by importing the measured road data into the simulation model.By analyzing the simulation results and the measured results,it can be concluded that the frequency index of the fitting line of the front and rear wheel pavement is the same,the difference of the frequency index of the fitting line of the left and right wheel pavement is only 0.059,and the maximum error of the frequency index of the fitting line of the measured pavement is 0.248.The results show that the deviation of the fitting line between the simulation and the measured road surface is small in the spatial frequency range of concern,and the model can better reflect the road roughness information.

关 键 词：路面随机输入 路面不平度 时域模型 功率谱密度 

分 类 号：S2:[农业科学—农业工程]