中文摘要：

基于铁路轨道精细化管理的需要，针对武广客运专线2013年全年的轨道不平顺检测数据进行功率谱密度的计算与统计处理，采用新的4参数拟合公式，建立武广客运专线上、下界限谱和建议谱的通用谱结构及拟合参数。同时，出于车一轨（桥）系统动力仿真的需要，基于国内已较为成熟的谱密度反演算法，考虑谱密度时频域转化的统一性，提出在获得谱密度结构及拟合参数的基础上，直接模拟任意波段及长度的轨道不平顺空间序列的简化算法。

英文摘要：

In order to meet the requirements of refined management of railway track, the paper described the in- vestigation on power spectrum density calculation and statistical processing for track irregularity inspection data of Wuhan - Guangzhou Passenger Special Line in 2013. The general spectrum structure of the upper - lower bound- aries and suggestion spectrum, were established by adopting a new four - parameter fitting formula. Besides, the track irregularity spatial series should be constructed with the requirement of vehicle - track （or vehicle - bridge） system dynamical simulation being taken into consideration. Therefore, based on the domestic inverse al- gorithms of spectrum density which have been relatively matured, and the consideration of the uniformity in the conversion process of spectrum density in time and frequency domain, this paper proposed a simplified inverse al- gorithm which can directly simulate any wave - band at any length of the track irregularity spatial series on the basis of acquiring the spectrum density structure and fitting parameters.