电磁颗粒阻尼器减振机理及试验研究

Theoretic and experimental investigation on electromagnetic particle damper

对直流电磁场作用下电磁颗粒阻尼器的减振效果进行了理论分析和试验研究。理论和试验结果表明:在一定振动强度下,可以通过施加直流电磁场的方法,加大颗粒体与振动系统间的动量交换,提高对结构振动的抑制作用;同时增大磁颗粒之间的接触压力,由此加大摩擦力,进而提高阻尼器的摩擦耗能。该方法为扩大颗粒阻尼器的适用范围,对抑制不同强度的振动提供了基础,使颗粒阻尼能够适应不同振动环境的要求。结果说明颗粒阻尼器可以由被动振动控制方法发展为半主动振动控制手段,本文的研究为这一潜在发展提供了有益探索。

In this paper the effect of electromagnetic field on ferromagnetic particle damping properties is experimentally investigated for thorough understanding its vibration suppression performances. It was observed that the electromagnetic field significantly increases the granular damping and the impact between the granular bed and container bottom. This phenomenon can be explained by the theory of interaction between magnetic dipoles. The result suggests that the electromagnetic field could be used to control the energy dissipation performance of a particle damping system in a semi-active way.