【作者】 张珍珍；

【导师】 刘学毅；

【作者基本信息】 西南交通大学 ， 道路与铁道工程， 2009， 硕士

【摘要】 弹性支承块式轨道具有一般无碴轨道的平顺性好和养护维修工作量少等特点外,还具有良好的弹性和减振降噪效果,在世界各国隧道和城市轨道交通建设中得到应用。但由于其弹性较高,容易导致轨道位移过大及钢轨外倾,影响列车运行的平稳性甚至安全性,在高速行车条件下影响更加严重。目前,弹性支承块式轨道上列车运行最高速度为200km/h,我国列车速度为200km/h的客运专线也已进入实际运营阶段,为适应更高速度的要求,本文基于弹性支承块式轨道的应用经验,针对其结构特点,分析研究了列车速度为250km/h时的轨道结构参数,主要包括以下内容:从行车安全及减振角度提出弹性支承块式轨道结构参数合理取值的评判准则,包括列车运行舒适性准则、轮轨动力作用准则、轨道变形准则和轨道振动准则。建立车辆-轨道垂向耦合动力模型,参照国内外轨道不平顺谱,考虑我国实际轨道不平顺状况,选用美国六级轨道高低不平顺谱作为系统激励,研究不同轨道结构参数,包括轨道刚度、轨道阻尼和支承块质量,对轨道垂向动力性能的影响,并提出250km/h行车速度时上述参数的合理取值范围。同时将弹性支承块式轨道与有碴轨道动力性能进行分析比较。建立轨道轨距扩大分析模型,研究不同支承块埋深及橡胶套靴刚度对轨距扩大的影响。在保证行车安全的条件下,提出支承块埋深和橡胶套靴刚度的合理取值范围。更多还原

【Abstract】 Low Vibration Track (LVT) is of good elasticity and great performance at vibration and noise reduction as well as favorable track evenness and less track maintenance work like other unballasted track. So it has been adopted on bridge tracks, tunnel tracks and urban rail transit home and aboard. At the same time, because of high elasticity, larger track deformation and rail rotation are produced, which may badly affect train riding quality and even safety as for high speed railway. Presently the maximum train running speed on LVT is 200km/h, and the 200km/h PDL is put into operation in our courtry. So, in order to meet requirements of higher speed, according to the characteristics of LVT, some analysis and researches about track structure parameters are made as for railways of 250km/h train running speed, which mainly consist of the following contents:From the viewpoints of train safety and vibration reduction, evaluation criterions for choosing reasonable values of LVT structure parameters are put forward, including criterions of train safety, driving comfort, wheel-rail dynamic action, track deformation and track vibration.Vehicle-track coupling dynamic modal is built and by referring to national & international track irregularity spectrum and taking national track irregularity status into consideration, American 6-level track profile irregularity spectrum is chosen as excitation. Effects on track dynamic performance, which are brought by differences of track structure parameters, like track stiffness, track damping and supporting block mass, are studied and then reasonable value range for above-mentioned track structure parameters is proposed for railways of 250km/h train running speed. What’s more, a comparison about dynamic performance is made between LVT and ballasted track.Analysis model of track dynamic gauge widening is built and effects on dynamic gauge widening, brought by the differences of embedded depth and rubber coat stiffness of supporting blocks affect, are studied. Based on the analysis, reasonable value range for embedded depth and rubber coat stiffness of supporting blocks is gained in the premise of train safety.更多还原