山地城市地铁线路曲线段异常波磨现象的产生机理及抑制方法

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振动与冲击 ›› 2021, Vol. 40 ›› Issue (14) : 228-236.

论文

崔晓璐1,2，漆伟2，杜子学1，董睿玺2，钟建科2

作者信息 +

Generation mechanism and suppression method for the abnormal phenomenon of rail corrugation in the curve interval of a mountain city metro

CUI Xiaolu1,2,QI Wei2,DU Zixue1,DONG Ruixi2,ZHONG Jianke2

Author information +

文章历史 +

摘要

针对山地城市地铁线路钢轨波磨通常发生在长大坡道大半径曲线外轨处的异常波磨现象，根据现场调研建立了波磨高发区段的车辆-轨道系统动力学模型，研究了As地铁车辆通过波磨高发区段时导向轮对-钢轨系统的动态特性。基于轮轨摩擦自激振动观点建立了相应区间弹性长轨枕支承轮轨系统的有限元模型，采用复特征值分析研究了波磨高发区段轮轨系统的摩擦自激振动特性。综合动力学分析和摩擦自激振动分析，研究了轮轨蠕滑特性、轮轨摩擦自激振动与波磨病害的关联性，从而揭示此类异常波磨病害的产生机理。进一步地，分别研究了车辆动力学参数和轨道支承结构参数对该区段轮轨摩擦自激振动的影响，并提出抑制波磨的相关方法。分析结果表明，在山地城市地铁线路波磨高发区段的缓和曲线到圆曲线处导向轮对外轮与外轨间的蠕滑力趋于饱和，轮轨间饱和蠕滑力易于诱导轮轨摩擦自激振动的产生，从而可能导致曲线外轨处产生波长为50~60 mm的异常波磨。在抑制方法的研究中发现车辆动力学参数的改变对轮轨摩擦自激振动特性的影响不大。同时，在一定范围内减小扣件垂向刚度和垂向阻尼有助于抑制该区段轮轨摩擦自激振动的发生，当扣件的垂向刚度为5 MN/m，垂向阻尼为10 000 N•s/m时，轮轨系统摩擦自激振动发生的可能性最小。以上均为山地城市异常波磨病害的抑制提供参考。

Abstract

Aiming at the abnormal phenomenon of rail corrugation that generally occurs on the outer rails of large radius curved tracks on a long ramp, the dynamic model of a vehicle-track system was established in the high-incidence section of rail corrugation on the basis of the field measurement.The dynamic characteristics of the leading wheelset-rail system were investigated when the As metro vehicle passing through the high-incidence section of rail corrugation.Then, based on the viewpoint of wheel-rail frictional self-excited vibration, a finite element model of the wheelset-rail system supported by elastic long sleepers in the relevant interval was established.The complex eigenvalue analysis was applied to study the frictional self-excited vibration characteristics of the system.The correlations between the wheel-rail creep characteristics, the frictional self-excited vibration of the wheelset-rail system and the rail corrugation were provided so as to reveal the generation mechanism of the abnormal phenomenon of rail corrugation.Furthermore, the effects of vehicle dynamic parameters and the track support structure parameters on the frictional self-excited vibration of the wheelset-rail system were studied respectively and related methods for suppressing the rail corrugation in the curve interval were proposed.The results indicate that the creep force between the outer wheel of leading wheelset and the outer rail tends to be saturated during the transition of the vehicle form even track to circular curved track in the high-incidence section of rail corrugation.The saturated creep force between the outer wheel and rail easily causes the wheel-rail frictional self-excited vibration, which may induce the abnormal rail corrugation on the outer rail of curved track with a wavelength of 50—60 mm.The study of the suppression method finds that the change of the vehicle dynamic parameters has little effect on the wheel-rail frictional self-excited vibration.Reducing the vertical stiffness and damping of the fastener in a certain range is helpful to suppress the occurrence of the wheel-rail frictional self-excited vibration.When the vertical stiffness of the fastener is 5 MN/m and the vertical damping is 10 000 N•s/m, the occurrence possibility of the wheel-rail frictional self-excited vibration in the section is least.The results provide a references for the suppression of the abnormal rail corrugation in the mountain city metro.

导出引用

崔晓璐，漆伟，杜子学，董睿玺，钟建科. 山地城市地铁线路曲线段异常波磨现象的产生机理及抑制方法[J]. 振动与冲击, 2021, 40(14): 228-236

CUI Xiaolu,QI Wei,DU Zixue,DONG Ruixi,ZHONG Jianke. Generation mechanism and suppression method for the abnormal phenomenon of rail corrugation in the curve interval of a mountain city metro[J]. Journal of Vibration and Shock, 2021, 40(14): 228-236

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