等代参数法预测颗粒夹击过程中的能量损耗

Equivalent parameter,method for predicting energy dissipation in particle clamping

带颗粒减振剂的碰撞阻尼以微细颗粒塑性变形的方式将振动能量永久消耗掉。为了定量地研究这种新型碰撞阻尼中的能耗情况,提出使用等代参数法利用已有的两球碰撞模型进行快速预测单个碰撞周期中颗粒夹击过程中的能量损耗。采用有限元方法对带颗粒夹击的两球碰撞过程模拟分析的结果与等代参数法预测的结果吻合较好。应用等代参数法的进一步的计算结果表明,在相同初始条件下带颗粒的夹击碰撞过程比不带颗粒的碰撞消耗能量更多,这一结果揭示了带颗粒减振剂的碰撞阻尼的性能优于传统的碰撞阻尼的原因,与已有的实验结果相吻合。最后通过有限元方法分析了颗粒与球直径比、颗粒材料、夹击颗粒数等参数对带颗粒夹击的两球碰撞过程的能量损耗的影响进行了讨论,进一步论证了等代参数法预测颗粒夹击过程中的能量损耗的合理性。研究结果可以用于带颗粒减振剂的碰撞阻尼系统的阻尼特性分析和整体仿真研究。

Impact damping with fine particles as damping agent （IDFPDA） exhausts vibration energy by means of the plastic deformation of fine particles. In order to quantitatively study energy dissipation due to the impact damping, equivalent parameters were used in the existing model of impact between two balls to rapidly predict the energy dissipation in particle clamping within a single impact period. The results of FE analysis for the impact between two balls covered with fine particles agreed well with those with the equivalent parameter method. The further results with the equivalent parameter method showed that the energy dissipation in particle cl^tmping is more than that in collision without particles under the same initial conditions, it was revealed that the performance of IDFPDA is better than that of the conventional impact damping and its resuks agree well with the existing experimental ones. By means of FE analysis, the effects of parameters including diameter ratio of particle to ball, particle material and particle amount in collision area on the energy dissipation of impact between two bails with fine particles were discussed, and the rationality of the equivalent parameter method was demonstrated. The study provided a useful tool to predict and simulate the damping feature of IDFPDA.