【摘要】 汽车的主要激励来自路面,对路面不平度的模拟和分析,是进行汽车行驶平顺性分析的基础.本文在回顾随机路面模拟和对非平稳随机过程描述的基础上,导出了非平稳随机过程功率谱密度存在的充要条件和Wiener过程的功率谱密度,并用Wiener过程模拟生成了非平稳随机路面.基于小波理论,对非平稳随机过程的路面激励进行了一维离散二进小波分解,有效地把路面激励信号中的平稳成分与非平稳成分、低频成分与高频成分等分离开.更多还原

【Abstract】 The random road is the leading excitation origin for vehicle and the simulation and analyses on rough road is the basis for the analyses on vehicle ride comfort.Based on the review for the simulation of random road and the analysis on the description of nonstationary random process,the necessary and sufficient condition of power spectrum density of nonstationary random process is presented,as well as the power spectrum density of Wiener process.Then the nonstationary random road is simulated with Wiener process.Wavelet decomposition of one-dimensional discrete binary is performed for nonstationary random road,and the compositions in road signal of stationary and nonstationary,low frequency and high frequency are separated effectively.更多还原