跌落工况下斜支承系统易损件的冲击特性

Shock Characteristics of Tilted Support Spring System with Quick-wear Parts under the Condition of Dropping

目的基于斜支承系统双自由度模型,研究系统易损件的跌落冲击特性。方法针对系统无量纲跌落冲击动力学方程,用龙格-库塔数值分析法获得易损件跌落冲击动力学响应,探讨系统支承角、频率比、跌落冲击初始速度、阻尼比等对易损件位移及加速度响应的影响规律。结果通过对易损件位移、加速度响应最值影响因素的分析表明,减小支承角可增加易损件位移响应最值,降低其加速度响应最值,延长响应周期;随着频率比的增加,易损件位移和加速度响应的最值减小;随着初始速度的增加,易损件位移、加速度响应最值上升明显;对于加速度响应最值,系统阻尼比存在最佳值。结论为使斜支承系统获得理想的减振和抗跌落冲击性能,需综合考虑各相关参数。

The work aims to study the drop shock characteristics of the system＇s quick-wear parts based on the double-degree-of-freedom model of tilted support system. With respect to the dimensionless drop shock dynamic equations of the system, the dynamic response of quick-wear parts＇ drop shock was obtained in the method of Runge-Kutta numerical analysis. Based on the numerical analysis, the effects of the support angle, the frequency ratio, the drop shock initial velocity and the damping ratio, etc. on the displacement and acceleration shock of quick-wear parts were analyzed. The analysis of the influencing factors on the peaks of displacement and acceleration shock of quick-wear parts demonstrated that, with the support angle decreasing, the displacement response peak increased; and the response period extended as the acceleration response peak decreased. With the increase of frequency ratio, the displacement shock peak and acceleration shock peak of quick-wear parts were reduced; with the initial velocity increasing, the displacement shock and acceleration shock peaks of quick-wear parts rose remarkably; furthermore, the optimal damping ratio of the system existed for the acceleration shock peak. To enable the tilted support spring system to obtain ideal vibration reduction and drop shock resistance characteristics, all relevant parameters should be comprehensively considered.