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首页> 外文期刊>Journal of Sound and Vibration >Stick-slip-separation analysis and non-linear stiffness and damping characterization of friction contacts having variable normal load
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Stick-slip-separation analysis and non-linear stiffness and damping characterization of friction contacts having variable normal load

机译：具有可变法向载荷的摩擦触点的粘滑分离分析，非线性刚度和阻尼特性

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摘要

Mechanical systems in which moving components are mutually constrained through contacts often lead to complex contact kinematics involving tangential and normal relative motions. A friction contact model is proposed to characterize this type of contact kinematics that imposes both friction non-linearity and intermittent separation non-linearity on the system. The stick-slip friction phenomenon is analyzed by establishing analytical criteria that predict the transition between stick, slip, and separation of the interface. The established analytical transition criteria are particularly important to the proposed friction contact model for the transition conditions of the contact kinematics are complicated by the effect of normal load variation and possible interface separation. With these transition criteria, the induced friction force on the contact plane and the variable normal load perpendicular to the contact plane can be predicted for any given cyclic relative motions at the contact interface and hysteresis loops can be produced so as to characterize the equivalent damping and stiffness of the friction contact. These non-linear damping and stiffness methods along with the harmonic balance method are then used to predict the resonant response of a frictionally constrained two-degree-of-freedom oscillator. The predicted results are compared with those of the time integration method and the damping effects, the resonant frequency shift, and the jump phenomenon are examined. (C) 1998 Academic Press Limited. [References: 20]
机译：通过接触相互限制运动部件的机械系统通常会导致涉及切线和法向相对运动的复杂接触运动学。提出了一种摩擦接触模型来表征这种类型的接触运动学，该模型将摩擦非线性和间歇分离非线性强加于系统上。通过建立分析标准来分析粘滑摩擦现象，该分析标准可预测粘滑，滑移和界面分离之间的过渡。建立的分析过渡标准对于所提出的摩擦接触模型特别重要，因为接触运动学的过渡条件受正常载荷变化和可能的界面分离的影响而变得复杂。利用这些转换准则，可以针对接触界面处的任何给定循环相对运动，预测在接触面上的感应摩擦力和垂直于接触面的可变法向载荷，并可以产生磁滞回线，以表征等效阻尼和摩擦接触的刚度。然后，将这些非线性阻尼和刚度方法以及谐波平衡方法用于预测摩擦约束的两自由度振荡器的共振响应。将预测结果与时间积分方法的预测结果进行比较，并检查阻尼效果，共振频率偏移和跳跃现象。 （C）1998 Academic Press Limited。 [参考：20]

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