摘要
对比国标给定幂函数形式的路面功率谱密度,采用最小二乘非线性参数估计法对路面功率谱密度有理函数表达式中的参数进行估计,将一维路面功率谱扩展成二维功率谱,推导了三维路面建模的二维傅里叶逆变换法。在MATLAB中利用该方法和传统方法生成C级路面高程数据,将仿真得到的三维路面直线轨迹、弯曲轨迹高程进行采样后做功率谱估计,并与标准等级路面功率谱对比。结果表明:该方法生成高程数据快,得到的三维路面横向、纵向直线轨迹和弯曲轨迹路面高程具有相同的功率谱特性。
According to the power spectral density （PSD） of road roughness with the power function form given by China standard organization, parameters of the PSD of road roughness with rational function expression were estimated using nonlinear least-square estimation. The 1-D PSD of road roughness was extended to a 2-D PSD. The relationship between 2-D PSD and 2-D road roughness was presented. 2-D Fouries inverse transformation method was deduced for 3-D road sourface modeling. Road C was simulated with software MATLAB based on this deduced method. The PSDs of road elevation for a straight track and a curve one in a 3-D road model were estimated and compared with standard PSD. The results showed that the road elevation characteristics of different tracks in a 3-D road model have the same PSD features, and the simulation speed is faster than that of the other methods. The 3-D road model could be used for vehicle dynamic simulation.
出处
《振动与冲击》
EI
CSCD
北大核心
2012年第21期68-72,共5页
Journal of Vibration and Shock
