不平顺谱对列车轨道系统动力性能影响的对比分析

轨道不平顺是影响高速列车-轨道系统动力响应的主要因素之一,为了对比分析不平顺谱对列车轨道系统的影响,运用轮轨系统动力学的基本原理,建立列车-无砟轨道-路基系统垂向耦合动力模型,计算分析3种不平顺谱下车辆和轨道系统的动力响应。结果表明:不同轨道谱作用下车辆与轨道系统动力响应具有较大的差异,美国轨道谱的影响最大;武广客运专线轨道谱的影响最小,但对轨道系统的影响与德国谱相近。建议对于具体实际问题,应选用合理轨道谱:既有的武广客运专线不平顺谱是在运营初期测得,适用于开通初期的高速铁路线路,对于已经运营数年的武广客运专线,应进行不平顺谱的复测,才能准确反映实际情况。

Contrastive Analysis of the Influence of Irregularity Spectrum on Train-track System Dynamics Characteristics

Track irregularity is one of the main factors affecting train-track system dynamics response. In order to analyze contrastively the influence of irregularity spectrum on train-track system,train-ballastless track-roadbed system vertical coupling dynamics model is established based on fundamentals of wheel-rail system dynamics,and the influence of irregularity spectrum of different tracks on train-track system dynamics response is analyzed. The results show that train-track system dynamics responses are different remarkably under different track spectrums. American track spectrum has the most impact on train and track system dynamics response,while Wuhan- Guangzhou track spectrum has minimal impact,but itstrack system dynamics response is similar to that of Germany spectrum. Reasonable track spectrum shall be selected accordingly. The existing Wuhan- Guangzhou irregularity spectrum was tested at the early age of operation and its irregularity spectrum applies only to the initial operation stage of high-speed lines. In view of Wuhan- Guangzhou high-speed rail which has been in service for several years,irregularity spectrum should be retested to reflect accurately actual situations.