Abstract：According to the power spectrum density (PSD) of road roughness based on power function given by china standard organization, Parameters of PSD of road roughness based on rational function are estimated using nonlinear least-squares estimation. The 1-D PSD of road roughness is extended to 2-D PSD. The relationship between 2-D PSD and 2-D road roughness is presented. Road C is simulated in software MATLAB based on this method. The PSD of road elevation of straight and curve track in the 3-D road model is estimated and compared with standard PSD. The result shows that road elevation characteristics can be reappeared precisely and the speed of the simulation is faster than other method . The road model can be used for vehicle dynamic simulation.
2012, Vol. 31 
