Abstract Severe short pitch railhead corrugation with a wavelength of approximately 70 mm has been observed on the inner rail of small radius curves on a general freight route in South Africa. Complex eigenvalue analysis of a reduced six mode modal model showed how coupling of the second coupled mode of traction motor pitching and wheelset torsion with the first asymmetric wheelset bending mode becomes unstable at the corrugation frequency in the presence of large lateral creepage. This occurs for a certain range of gear mesh stiffness when traction is transmitted across the wheelset traction motor gear pair.

中文翻译：

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存在转向模式时模式耦合不稳定导致的轨头波纹

摘要 在南非某普通货运航线的小半径曲线内轨上观察到严重的短节距轨头波纹，波长约为70 mm。简化的六模态模型的复特征值分析表明，在存在较大横向爬电距离的情况下，牵引电机俯仰和轮对扭转的第二耦合模式与第一非对称轮对弯曲模式的耦合在波纹频率下变得不稳定。当牵引力通过轮对牵引电机齿轮对传递时，在一定范围的齿轮啮合刚度下会发生这种情况。