磁流变弹性体变刚度隔振系统的设计与仿真分析

摘要

Magnetorheological elastomers (MRE) are accompanied with the advantages in magneto-rheological fluid and elastomer and the shear modulus can be controlled by external magnetic field, so that it has extensive potential application in vibration control. The stiffness of vibration isolator in existing vibration isolation system is generally fixed and that will limit the effect of vibration isolation system. When the vibration has lower frequency, the isolation performance is quite poor especially in the case of sympathetic vibration. This paper proposes to apply the MRE isolator with adjustable stiffness in vibration isolation systems to control the shear modulus of the MRE by changing the coil current in vibration isolator, thus to adjust the stiffness of isolation system and enable the vibration isolation system to obtain a wider frequency range. The designed structure of the vibration isolator demonstrates its effectiveness by simulation analyses of the effects of vibration isolation system based on the software SimuLink.%磁流变弹性体兼有磁流变液和弹性体的优点,其剪切模量可由外加磁场控制,在振动控制等方面具有广阔的应用前景.现有的隔振系统中隔振器刚度一般都是固定值,这使系统的隔振效果有局限性,对较低频率振动,尤其是共振时的隔离效果很差.提出了将可调刚度的磁流变弹性体隔振器用于隔振系统中,通过改变隔振器的线圈电流大小来控制磁流变弹性体的剪切模量,进而调整隔振系统的刚度,使系统获得更宽的隔振频率范围.设计了隔振器的结构,基于SimuLink软件对系统的隔振效果进行仿真分析,表明了设计的有效性.