振动压实系统的非线性动力学分析

Non-linear Dynamic Analysis of Vibration Compaction System

在周期载荷作用下由于振动摩擦作用,物料发生弹塑性变形,从而振动压实系统的弹性恢复力与位移呈现滞回特性。滞回圈的变化趋势反映了物料的变形过程及压实效果,系统的激振力、物料的刚度及阻尼的变化均对滞回圈产生直接或间接的影响;为了深入研究振动压实系统的非线性动力学问题,本文建立具有分段曲线的二自由度系统模型,采用数值方法求解该模型,同时利用仿真分析激振力等参数对滞回圈的影响,并且分析表明在特定参数下系统产生混沌现象。

Materials present plastic deformation under cyclical loading because of the influence of vibration friction, and the resilience vs the displacement show the hysteresis trait in a vibration compaction system. The change trend of hysteresis loops reflects the deforming and the compaction effect of materials. Hysteresis loops are affected directly or indirectly by exciting force and the rigidity and damp of materials. To study the non-linear dynamic characteristic of a vibration compaction system, we first build up a double DOF model, then it is solved numerically with segmental curve, Finally, we analyse the effect of exciting force on hysteresis loops by simulation. The result shows that the system present chaotic phenomena under the specific parameters.