挤压式MRE阻尼器减振特性的实验研究

摘要

This paper is devoted to a better insight into the vibration reduction characteristics of a self-designed MRE damper in a squeeze operation mode.The research involves designing an experiment test platform;and testing and analyzing the vibration reduction effect of the damper under the condition of inputting different control current (0～2.0 A) and exciting frequency (90～170 Hz).Experimental results show that when the control current is applied in the resonant area, the MRE damper could provide an effective reduction in the vibration isolation coefficient and the vibration amplitude;when current is applied, the whole vibration isolation coefficient decreases with the increase of the control current if the excitation frequency is less than the resonance frequency while the whole vibration isolation coefficient increases with the current increase if the excitation frequency is larger than the resonance frequency;and when no current is applied, an increase in the excitation frequency is accompanied by an initial increase and a subsequent decrease in the amplitude peaks, with different degrees of the amplitudes reduction.The MRE damper demonstrates a better magnetic control performance and frequency shift damping effect in a wider excitation frequency range.%为了获得自主设计挤压式MRE阻尼器的减振效果,搭建实验测试平台,在分别输入不同控制电流(0～2.0 A)和激振频率(90～170 Hz)的条件下,测试和分析该阻尼器的减振性能.结果表明:在共振区域施加控制电流时,该MRE阻尼器能有效降低隔振系数和振动幅值.施加电流时,若激振频率小于共振频率,则整体的隔振系数随着控制电流的增大而减小;若激振频率大于共振频率,则整体的隔振系数随着电流的增大而增大.不施加电流时,随着激振频率的增大,振幅峰值均呈现先增大后减小的趋势,且振幅均有不同程度的降低.该MRE阻尼器在较宽的激振频段内具有较好的磁控性能和移频减振作用.