圆柱形颗粒阻尼器耗能特性的离散元计算

Discrete element calculation of Energy dissipation characteristics of Cylindrical Particle damper

本文采用离散单元法建立圆柱型颗粒阻尼器的仿真模型,研究垂直振动边界条件驱动下由颗粒体产生的损耗功率,结果表明颗粒的填充率、简谐振动的频率与幅值均会影响着颗粒阻尼器的损耗功率,并且在高填充率范围内存在一个填充率的最优值。当简谐振动的频率固定时,只有当简谐振动的幅值超过某个临界点后,颗粒阻尼器才体现出耗能能力并且损耗功率随着位移幅值的增大而增大,在低频段具有强耗能特性。

In this paper,the discrete element method is used to study the energy dissipation characteristics of cylindrical particle dampers in simple harmonic vibration.The resuls show that the filling rate of particles,the frequency and amplitude of simple harmonic vibration will affect the loss power of particle dampers.The loss of power at high filling rate is generally larger than the low filling rate and there is an optimal value of filling rate.The loss power generated by particles has an ampitude critical point,before the critical point,the particle daping does not lose energy,after the critial point,the loss power increases with the increase of the displacement amplitude,and has strong energy dissipation characteristics in the low frequency band.