高架轨道交通无砟轨道谱特性分析

Characteristic analysis of unballasted track irregularity spectrum for urban viaduct rail transit

为了获取高架轨道交通无砟轨道谱的特征参数,提出采用Levenberg-Marquardt法对原始轨道谱线进行拟合。以上海轨道交通3号线检测数据作为样本、我国干线铁路7参数谱模型作为拟合公式,利用Levenberg-Marquardt法对轨道标准谱进行拟合。研究结果表明:采用Levenberg-Marquardt法对轨道谱进行拟合是可行的,轨道拟合谱线可以较好地表征原始轨道不平顺特征;得到了轨道谱以及轨道上、下极限谱的特征参数;基于轨道谱提出轨道质量判断方法,将轨道质量分为优良、合格和不合格3个类别,利用轨道谱及极限谱对轨道质量进行判定;最后,建议把轨道不平顺谱纳入轨道质量管理体系中,将其作为轨道质量的主要控制指标之一。

In order to get the unballasted track spectrum that reasonably indicates the irregularity character of ur- ban viaduct rail transit, a fitting approach for track spectrum was presented based on Levenberg - Marquardt method. According to track geometry data collected by track recording vehicles from Shanghai urban viaduct rail transit line 3 and track irregularity spectrum model from China Academy of Railway Sciences, the optimization parameters of the fitting spectrum were calculated using Levenberg - Marquardt approach. The fitting results show that the approach is feasible since the fitting track spectrum can accurately describe the track irregularity charac- ter of urban viaduct rail transit, and the optimization parameters of fitting track spectra are obtained. Based on track irregularity spectrum, the quantitative judgment method on track quality was investigated and put forward, which divided the track spectrum into 3 regions from bottom to top. Finally, the track irregularity spectrum is suggested as a principal index to control track geometry irregularity.