Random vibration analysis for coupled vehicle-track systems with uncertain parameters
Random vibration analysis for coupled vehicle-track systems with uncertain parameters
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DOI：
10.1108/ec-01-2015-0009
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发表时间：
2016-04
影响因子：
1.6
通讯作者：
P. Xiang;Yan Zhao;Jiahao Lin;D. Kennedy;F. Williams
中科院分区：
文献类型：
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作者：
P. Xiang;Yan Zhao;Jiahao Lin;D. Kennedy;F. Williams
目的：本文的目的是针对具有不确定参数的车辆-轨道耦合系统，提出一种新的基于随机振动的随机轨道不均匀性评估方法。设计/方法/方法-车辆的不确定参数被描述为有界随机变量。将轨道视为一个无限周期结构，通过轮轨耦合关系，建立了混合物理坐标和辛对偶坐标下车辆-轨道耦合系统的动力学方程。采用伪激励方法，将轮轨接触点处的随机轨道不规则性转化为一系列具有相位滞后的确定性谐波激励。基于伪响应的多项式混沌展开，推导了混沌展开伪方程，从而得到了伪激励法-多项式混沌展开法的组合混合方法。发现-不确定性传播对随机振动分析的影响…
Purpose – The purpose of this paper is to present a new random vibration-based assessment method for coupled vehicle-track systems with uncertain parameters when subjected to random track irregularity. Design/methodology/approach – The uncertain parameters of vehicle are described as bounded random variables. The track is regarded as an infinite periodic structure, and the dynamic equations of the coupled vehicle-track system, under mixed physical coordinates and symplectic dual coordinates, are established through wheel-rail coupling relationships. The random track irregularities at the wheel-rail contact points are converted to a series of deterministic harmonic excitations with phase lag by using the pseudo excitation method. Based on the polynomial chaos expansion of the pseudo response, a chaos expanded pseudo equation is derived, leading to the combined hybrid pseudo excitation method-polynomial chaos expansion method. Findings – The impact of uncertainty propagation on the random vibration analysis...