A parametric dynamic study on hunting stability of full dual-bogie railway vehicle
A parametric dynamic study on hunting stability of full dual-bogie railway vehicle
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DOI：
10.1007/s12541-011-0064-1
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发表时间：
2011-06
影响因子：
1.9
通讯作者：
Pilkee Kim;Jeehyun Jung;J. Seok
中科院分区：
文献类型：
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作者：
Pilkee Kim;Jeehyun Jung;J. Seok
对由一个车体、两个转向架构架和每个构架上的两个轮对组成的整车系统的蛇行稳定性进行了分析。该分析中纳入了非线性启发式蠕变和法兰-钢轨接触模型。结果表明，蛇行速度对主纵向刚度和主横向刚度最为敏感，非线性蠕变模型对将蛇行速度限制在合理的物理范围内起着关键作用。进行特征分析，以调查车辆的动态行为在附近的蛇行速度。结果表明，不仅存在最优复共轭根对，而且存在其阴影根。这两个主要的本征解对狩猎运动的作用进行了深入探讨，通过数值研究，使用分叉分析和轨道表示。结果表明，在模态转换速度之前，非线性蛇行运动主要是指主振型，而在临界速度之后，非线性蛇行运动不仅指主振型，还包括其阴影振型，这支持了双转向架车辆模型在蛇行分析中的必要性。
Analysis is performed on the hunting stability of a full railway vehicle system composed of a vehicle body, two bogie frames, and two wheelsets for each bogie frame. Incorporated into this analysis are the nonlinear heuristic creep and flange-rail contact models. The results show that the hunting speed is most sensitive to the primary longitudinal and lateral stiffnesses, and the nonlinear heuristic creep model plays a key role in confining the hunting speed within a physically reasonable range. Eigenanalysis is performed to investigate the dynamic behavior of the vehicle in the vicinity of the hunting speed. The results reveal that there exists not only the most dominant pair of complex conjugate roots, but also its shadowed roots. The roles of these two principal pairs of eigensolutions in the hunting motion are thoroughly explored via numerical studies using bifurcation analysis and an orbital representation. It is shown that the nonlinear hunting motions before the modal transition speed mainly refer to the principal mode, and those after the critical speed refer not only to the principal mode, but also to its shadowed mode, which supports the necessity of the dual-bogie railway vehicle model in the hunting analysis.