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首页> 外文会议>International conference on transportation engineering >Influence of Heavy Axles on the Dynamic Response of the Existing Railway Ballast Track under Freight Vehicle Running
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Influence of Heavy Axles on the Dynamic Response of the Existing Railway Ballast Track under Freight Vehicle Running

机译：重载对货车行驶下既有铁路道Ball轨道动力响应的影响

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In order to relief railway transportation pressure in China, the load-raising reform of existing railway lines is paid much more attention. In load-raising reform of existing railway lines process, the most obvious improvement is the increase of vehicle axle load. Using the theory of wheel-track dynamics, The vertical dynamic model for the ballast rail track and heavy haul train interaction could be built. In this model, the heavy haul train is regarded as a subsystem with 10 degrees of freedom, and the ballast track structure is built using finite element method. The two subsystems are coupled using via non-linear Hertz contact mechanism considering the influence caused by track irregularity. This paper analyzes the dynamic response between train and track using the combination method of new rapid explicit integration method and Newmark integration method. And the dynamic response of existing ballast track under heavy haul train of different loads which are 25t, 27t and 30t is specialized analyzed. During the analysis process, the dynamic performance indexes include: rate of wheel load reduction, wheel-rail vertical force, dynamic displacement of the ballast track, vibration acceleration of ballast track, and dynamic stress distribution of ballast track. The research results show that: 1). When heavy haul train are running on ballast track, every dynamic performance index is still within the national standards, and it can meet the dynamic requirement for running heavy haul train. 2). The trends of the dynamic displacement of the track structure under different loads are similar to one another. And the dynamic displacements of the rail under 27t-axle-load and 30t-axle-load increase 16% and 22% respectively, compared with the 25t-axle-load. 3). In general it can be concluded that the growth proportion of the dynamic stress of the track structure is similar to the dynamic displacement. And the dynamic stresses of the rail under 27t-axle-load and 30t-axle-load increase 15% and 22% respectively, compared with the 25t-axle-load.
机译：为了缓解中国的铁路运输压力，对既有铁路线的负荷提升改革给予了更多的关注。在现有铁路线过程中的负荷提升改革中，最明显的改进是增加了车轴负荷。利用轮轨动力学理论，可以建立道the轨道与重载列车相互作用的竖向动力学模型。在该模型中，重载列车被视为具有10个自由度的子系统，压载轨道结构是使用有限元方法构建的。考虑到轨道不平整的影响，两个子系统通过非线性赫兹接触机制进行耦合。本文采用新型快速显式积分法和Newmark积分法相结合的方法对列车与轨道之间的动力响应进行了分析。并对25t，27t和30t不同载荷下的重载列车下现有道track轨道的动力响应进行了专门的分析。在分析过程中，动态性能指标包括：车轮载荷降低率，轮轨垂直力，道the轨道的动态位移，道ast轨道的振动加速度，道ast轨道的动态应力分布。研究结果表明：1）。重载列车在压载轨道上行驶时，各项动态性能指标均在国家标准范围内，可以满足重载列车运行的动态要求。 2）。轨道结构在不同载荷下的动态位移趋势彼此相似。与25t轴载荷相比，在27t轴载荷和30t轴载荷下，钢轨的动态位移分别增加了16％和22％。 3）。通常可以得出结论，轨道结构动应力的增长比例与动位移相似。与25t轴载荷相比，钢轨在27t轴载荷和30t轴载荷下的动应力分别增加了15％和22％。

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