中文摘要：

考虑铁道罐车以及罐内装载的物体作为一个复杂系统，在运行时轮轨与轨道的相互作用下，研究车辆的安全问题，特别是罐车纵向加速度引起的问题显得相当复杂。为了分析罐车出现问题时的纵向加速度特性及故障原因，对正常信号和含故障的纵向加速度信号求互谱密度函数，找出共有纵向冲击频率，将该频率从含故障信号中滤除，反复数次，削弱故障信号中的正常运行的主要成分，最后通过加速度功率谱密度将纵向故障冲击频率从故障信号提取出来。

英文摘要：

Considering railroad tank cars and tank mounted object as a complex system, it is quite complex to study the problem of vehicle safety, especially the tanker problems caused by longitudinal acceleration under the interaction between wheel and rail tracks at run time. In order to analyze the causes of the problems and the characteristics of longitudinal acceleration when problems occurred, cross- spectral density function can be obtained by normal signal and longitudinal acceleration signal to find the total longitudinal impact frequency. Otherwise, the frequency is filtered out of the signal which contains faults, and repeated several times, the main components of the fault signal in the normal operation can be weaken. Finally, the longitudinal fault impact frequency can be extracted from the fault signal by the acceleration power spectral density.