一种新颖超磁致伸缩作动器的隔振模型

根据超磁致伸缩材料的本构方程分析了超磁致伸缩作动器输出位移的组成,以此为根据建立了基于超磁致伸缩作动器的单层单自由度隔振平台数学模型.该模型以平台在激振力作用下产生的振动位移为系统干扰输入;根据此模型分析了基于超磁致伸缩作动器的隔振原理;在频域内推导出了系统隔振能力与激振力频率及作动器最大输出位移之间的数学关系,然后在时域内采用自适应LMS(Least Mean Square)算法在Matalb环境下进行仿真.仿真结果与理论分析均表明,隔振平台的隔振能力与激振力频率的平方以及作动器最大输出位移成正比,从而为合理设计隔振平台用超磁致伸缩作动器提供了理论依据.该模型不仅可用于分析基于磁致伸缩作动器的隔振原理,对其它作动器的隔振原理也适用. 

Novel model of active vibration isolation based on giant magnetostrictive actuator

Through analyzing the constitutive relation of the giant magnetostrictive material,the main controllable factor constituting the output displacement for giant magntostrictive actuator was discussed.Upon which to investigate the key factors of single layer and one degree of freedom isolation platform based on giant magntostrictive actuator,a model with the displacement responding to acting force of the platform as its reference input was presented.Through analyzing the vibration isolation principle with the model,the conclusion was drawn that both acting force frequency and the maximum displacement of actuator are crucial to the effect of the system,in that the system vibration isolation capacity is direct ratio to the square of acting force frequency and maximum displacement of actuator.In time-domain,simulations based on Matlab platform with adaptive LMS(least mean square) algorithm were carried out to verify the conclusion.Thus it is theoretically instructive to design a vibration isolation system with giant magnetostrictive actuator,and the model is suitable to the system with giant magnetostrictive actuators as well to the system with other kinds of actuators.