基于磁致变刚度的微振动隔振器动态特性研究

Study on dynamic performance of micro vibration isolator based on magnetic field-dependent stiffness

磁敏弹性体是智能材料家族中的新成员,其储能模量(刚度)可由外加磁场控制,利用磁敏弹性体的这一特性,以其作为变刚度元件设计了面向精密设备的磁致变刚度微振动隔振器。采用扫频与定频试验探讨了微振动隔振器动态隔振特性。结果表明,在励磁电流激励的磁场控制下,磁敏弹性体刚度随激励磁场实时变化,导致系统产生移频效应,使隔振器在宽频范围内具有良好的隔振效果,尤其共振区的隔振效果最佳。

Magneto-sensitive elastomer is a new member of smart material family,of which the storage modulus(stiffness)can be controlled by an external magnetic field.Due to properties of the magneto-sensitive elastomer,a magneto-induced variable stiffness micro-vibration isolator was designed for precision equipment using the magneto-sensitive elastomer as variable stiffness element.The dynamic vibration isolation performance of the micro-vibration isolator was discussed by using sweep and fixed frequency tests.Through experimental research,the stiffness of the magneto-sensitive elastomer changes in real time with the excitation magnetic field under the control of the magnetic field excited by the excitation current,and the system frequency shift effect will be produced.The results show that the vibration isolator has a good vibration isolation effect in a wide frequency range,especially in resonance zone.