沪昆线与金温线轨道不平顺谱的分析

Analysis of Track Irregularity Spectrum of Shanghai-Kunming and Jinhua-Wenzhou Railways

摘要:

首先比较了国内轨道不平顺统计谱与国外轨道标准谱的差异。根据沪昆和金温两条线路的轨道不平顺检测数据，利用Matlab编程分别进行功率谱和TQI分析，沪昆线路轨道不平顺功率谱要明显好于美国六级铁路的不平顺谱，而金温线轨道谱接近于美国五级铁路的不平顺谱。利用相干函数对轨道不平顺与车体的垂向和横向振动加速度进行相干分析，并结合车体加速度功率谱分析，归纳出轨道不平顺不利波长的范围，为轨道的养护维修和管理提供了理论和实践指导。然后再对各项轨道不平顺谱值进行积分，得出TQI单项指数与各轨道不平顺谱面积值具有很好的相关性，从而验证了用功率谱评价轨道质量的可靠性。最后建议将轨道不平顺功率谱作为控制提速线路轨道质量的主要指标之一。

Abstract:

The difference between China railway track irregularity statistic spectrums and abroad railway track irregularity spectrums is compared first, then, according to the track geometry data measured from Shanghai-Kunming and Jinhua-Wenzhou railways, PSD(Power Spectral Density) and TQI(Track Quality Index) are calculated with Matlab program. The results shows that the former track irregularity spectrum values are much smaller than the US class 6 railway’s, while the latter ones are close to the US class 5 railway’s. The coherence functions are utilized to analyze the relationship between track irregularities and vertical and lateral car body vibration accelerations. Together with car body vibration acceleration spectrum analysis, the conclusion that the range of detrimental track irregularity wavelengths has been drawn, thus providing theoretical and practical guidance for track maintenance and management. Furthermore, the paper calculates the integral of each track irregularity spectrum values. The results show that each TQI has a close relationship with each track irregularity spectrum area. Consequently, it proves the reliability of appraising the track quality with PSD analysis. Finally, the track irregularity spectrum is proposed to be one of the main indexes to control the track geometry for speed-up railway.