基于改进的EMD方法提取车辆-轨道垂向耦合系统动态特性

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振动与冲击 ›› 2011, Vol. 30 ›› Issue (8) : 212-216.

论文

基于改进的EMD方法提取车辆-轨道垂向耦合系统动态特性

陈双喜; 林建辉; 陈建政

作者信息 +

Dynamic Characteristics Extraction of Vertical Vehicle-Track Coupling System Based On Improved EMD

CHEN Shuang-xi; LIN Jian-hui; CHEN Jian-zheng

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文章历史 +

摘要

提出利用一种改进的经验模态分解（EMD）方法提取车辆-轨道耦合系统的动力学特性。该方法以改进的极值域均值代替极值点包络线的均值来提高局部均值的求解精度，以边界波形匹配预测法来抑制端点效应。基于车辆－轨道耦合动力学理论，建立客车-弹性支承块无砟轨道垂向耦合动力学模型，计算车辆-轨道耦合系统在波浪形磨损和轨道不平顺组合激励模型下的振动响应。运用改进的EMD方法对系统的振动响应进行经验模态分解，并且对轮轨力、转向架和车体加速度的本征函数进行分析和比较。研究结果表明：改进的EMD方法自适应地将振动响应分解成本征函数，能有效地提取车辆-轨道耦合系统的动力学特性。

Abstract

In order to extract dynamic characteristics of vehicle-track coupling system, the Improved Empirical Mode Decomposition was presented. In this method, extremum points envelopment mean were replaced by improved extremum field mean and the boundary wave matching algorithm was used to restrain the end effect. Based on the theory of vehicle-track coupling dynamics, the vertical vehicle ballastless-track coupling dynamics model was established. Under the rail corrugation and rail irregularity excitation model, dynamic responses of vehicle-track coupling system were calculated at different speed. These dynamic responses were decomposed by Improved Empirical Mode Decomposition, and then the intrinsic mode functions of vertical contact force, bogie acceleration, and car body acceleration were analyzed and compared. The results show: the Improved Empirical Mode Decomposition can self-adaptively decompose vibration signals to intrinsic mode functions and so effectively extract dynamic characteristics of vehicle-track coupling system.

导出引用

陈双喜;林建辉;陈建政. 基于改进的EMD方法提取车辆-轨道垂向耦合系统动态特性[J]. 振动与冲击, 2011, 30(8): 212-216

CHEN Shuang-xi;LIN Jian-hui;CHEN Jian-zheng. Dynamic Characteristics Extraction of Vertical Vehicle-Track Coupling System Based On Improved EMD[J]. Journal of Vibration and Shock, 2011, 30(8): 212-216