中文摘要：

研究目的：轨道不平顺是引起车辆与轨道结构产生振动的主要激励源。不同种类的不平顺,其激扰方向和影响程度各不相同,而且轨道不平顺的幅值和波长对车辆/轨道动力特性都产生重要影响。因此,从幅值和波长两个方面揭示轨道不平顺特征的功率谱密度进行研究,可更全面研究车辆的振动性能。研究结论：本文通过分析武九线实测的轨道不平顺数据,得到武九线线路不平顺功率谱分布函数。根据测得的车体振动加速度,将不种类的轨道不平顺与车辆的振动加速度进行相干分析,得到了引起车辆较大振动加速度的最不利波长。

英文摘要：

Research purposes： Track irregularity is the main sources to induce the vibration of vechicle and track structure.For different types of track irregularity,the stimulation and disturbance direction and impact level are different.And the amplitude and wavelength of track irregularity produce significant effect on the dynamical characteristics of vehicle and track structure.So the study can be done on revealing the power spectrums of track irregularity characteristics from the amplitude and wavelength to better know the vibration characteristics of vehicle.Research conclusions：From the measured data of the track irregularity of Wuhan-Jiujiang Railway Line,the distribution functions of the power spectrums of the track irregularity are obtained.According to the measured acceleration of the vehicle vibration,the analysis is made for correlation between the different track irregularities and vibration acceleration and the most unfavorable wavelength that brings about the vehicle vibration is known.