粘-滑比对干摩擦约束结构动态响应的影响

Effects of Stick-slip Ratio on Dynamic Response of Dry Friction Constrained Structure

用AFT(Alternated Frequency/Time)方法计算了受干摩擦约束系统稳态响应,进而计算了干摩擦能耗及干摩擦触点的粘滞-滑移状态。结果表明:干摩擦能耗最大值对应的结构稳态振幅没有达到最小。而应用干摩擦触点粘-滑比率来衡量干摩擦约束结构的减振性能是一种更有效的方法。最后,分析了结构内阻对选择粘-滑比率的影响。

This paper uses the alternated frequency / time method to calculate the stable response of a dry friction constrained structure and the energy dissipated by dry friction,thus determining the stick-slip state of its contact spot. The calculation results show that the stable amplitude of the constrained structure does not have a minimum when the energy dissipated by dry friction reaches its maximum; however,it is a more effective method to evaluate the vibration reduction performance of dry friction with the stick-slip ratio of the contact point. Finally,the effect of the structural damping on selecting the stick-slip ratio is analyzed.