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IDENTIFICATION OF DYNAMIC PROPERTIES OF A RAILWAY TRACK

机译:铁路轨道动力特性的识别

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摘要

The paper presents a methodology for assessment of dynamic characteristics of a railway track in application to an Embedded Rail Structure. First, the dynamic responses of a track are obtained using a Hammer Excitation Test (HET) by applying a vertical impulse load to a rail and measuring resulting accelerations of a track. The measured data is then analyzed using the Frequency Response Function (FRF). The hammer test is also simulated by the finite element model (RAIL), which can be used for analysis of the dynamic behavior of a track under various loading. Both HET and RAIL are developed at Delft University of Technology (DUT). To match the simulation and measurement data a numerical optimization technique called a Multipoint Approximation based on Response Surface fitting (MARS) method has been used. The parameters of the model related to the material properties of elastic compound (polyurethane and cork mixture) wherein the rails are embedded have been varied during the identification process. The numerical model with the obtained parameters of compound can then be used for estimation of performance characteristics of the railway track. The compound parameters have been compared with the ones obtained using a single degree of freedom mass-spring system. The results of the identification problems are presented and discussed.
机译:本文提出了一种评估铁路轨道动态特性在嵌入式铁路结构中的应用的方法。首先,使用铁锤激励测试(HET)通过向轨道施加垂直冲击载荷并测量轨道的最终加速度来获得轨道的动态响应。然后使用频率响应函数(FRF)分析测得的数据。锤击测试也通过有限元模型(RAIL)进行仿真,该模型可用于分析各种载荷下轨道的动态行为。 HET和RAIL均由代尔夫特理工大学(DUT)开发。为了匹配模拟和测量数据,已使用一种基于响应曲面拟合(MARS)方法的称为“多点近似”的数值优化技术。在识别过程中,与嵌入轨道的弹性化合物(聚氨酯和软木混合物)的材料特性有关的模型参数已更改。具有获得的复合物参数的数值模型然后可以用于估计铁路轨道的性能特征。复合参数已与使用单自由度质量弹簧系统获得的参数进行了比较。提出并讨论了识别问题的结果。

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