中文摘要：

将虚拟激励法和车辆-有砟（无砟）轨道-路基-地基耦合系统垂向振动解析模型有效结合起来，由轨道不平顺功率谱直接得到准确的列车随机激振荷载功率谱，然后采用频率采样三角级数法反演出列车随机激振荷载时程。为铁路环境振动中列车随机激振荷载的计算提供了一简便有效的方法。算例比较了有砟轨道和无砟轨道两种情况下CRH3高速列车运行引起的列车随机激振荷载功率谱密度与时程曲线。

英文摘要：

The analytical model for vehicle-ballasted(unballasted)track-subgrade-ground vertical coupling vi-bration and the pseudo-excitation method are effectively combined in this paper. The accurate power spectrums of train stochastic vibrating loads are directly obtained by using the power spectral of track irregularity,and the time histories of train stochastic vibrating loads are solved by the trigonometric series approach in which sam-plings are conducted in the frequency domain. Thus a simple and effective method for calculating train stochas-tic vibrating loads in railway environmental vibration is provided. The power spectrum densities and time histo-ries of train stochastic vibrating loads generated by a CRH3 high speed train for two cases with ballast track and unballasted track are analyzed in the numerical example.