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Nonlinear investigation of the effect of suspension parameters on the hunting stability of a railway truck

机译：悬架参数对铁路货车摆动稳定性影响的非线性研究

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The mathematical model of a single conventional railway truck (bogie) consisting of two wheelsets moving with constant speed on a smooth, level, and tangential track is used to numerically investigate the nonlinear dynamics of the truck. Nonlinearities in the model include the nonlinear wheel-rail profile, the friction-creep characteristics of the wheel-rail contact geometry, and the Coulomb friction element between truck frame and bolster. Single-point and two-point wheel-rail contact scenarios are considered in the model. Sensitivity of the critical hunting velocity to primary and secondary suspension parameters is examined. Results of the lateral stability study indicate that the critical hunting velocity of the truck is most sensitive to the primary longitudinal stiffness. A method involving semi-active control of the primary longitudinal stiffness is developed to raise the critical velocity of hunting. This approach is seen to considerably increase the truck critical hunting velocity.
机译：单个常规铁路卡车（转向架）的数学模型由两个轮对组成，它们在平滑，水平和切向的轨道上以恒定速度运动，用于对卡车的非线性动力学进行数值研究。模型中的非线性包括非线性的轮轨轮廓，轮轨接触几何形状的摩擦蠕变特性以及卡车车架和承梁之间的库仑摩擦元件。该模型考虑了单点和两点的轮轨接触情况。考察了临界振荡速度对一级和二级悬架参数的敏感性。横向稳定性研究的结果表明，卡车的临界搜寻速度对主要纵向刚度最敏感。开发了一种涉及对主要纵向刚度进行半主动控制的方法，以提高摆动的临界速度。可以看出，这种方法大大提高了卡车的临界摆动速度。

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