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力学学报  2012 

不确定车轨耦合系统辛随机振动分析

DOI: 10.6052/0459-1879-11-361, PP. 769-778

Keywords: 辛方法,虚拟激励法,不确定,车轨耦合系统,Hermite正交多项式

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Abstract:

建立了轨道不平顺作用下具有不确定参数车轨耦合系统随机振动评估方法.车辆系统采用物理坐标下多刚体系统模型,并应用高斯随机变量模拟车体、转向架和轮对一系、二系连接系统中动力学参数具有的不确定性.采用无穷周期结构进行弹性轨道模拟,在哈密顿状态空间下建立了典型轨道子结构的状态运动方程,通过轮轨耦合关系建立了混合物理坐标及辛模态坐标车轨耦合系统运动方程.应用Hermite正交多项式展开得到了耦合系统动力响应相对于不确定性参数的控制方程.由于利用轨道周期特性建模,所获得的控制方程有效地降低了方程维度.轮轨接触处轨道不平顺载荷模拟为完全相干多分量平稳随机过程,推广和发展虚拟激励法建立了耦合系统随机振动受不确定动力学参数影响的量化评估方法.通过MonteCarlo数值模拟,验证了该方法在不确定参数变异很大时也能够保持较好的精度,具有一定的工程实用性.

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