具有电磁约束阻尼层梁的振动主动控制研究计算(英文)

Active Vibration Control of Beam Using Electro-magnetic Constrained Layer Damping

本文研究了具有电磁约束阻尼层(EMCLD)梁的振动主动控制,电磁约束阻尼层是由电磁层、永磁层和粘弹性阻尼层三部分构成,它利用电磁层和永磁层之间的电磁力作为作动力,对系统的振动进行控制,具有作动方式合理、响应快,耗能低等优点。本文对EMCLD进行建模并计算其电磁力,基于Hamilton原理推导出具有 EMCLD梁的振动控制微分方程,采用速度比例反馈进行振动控制的数值仿真和试验,理论分析和试验结果表明电磁约束阻尼层是一种有效的控制结构振动的方法。

This paper investigates vibration control of beam through electro-magnetic constrained layer damping （EMCLD） which consists of electromagnet layer, permanent magnet layer and viscoelastic damping layer. When the coil of the electromagnet is electrified with proper control strategy, the electromagnet can exert magnetic force opposite to the direction of structural deformation so that the structural vibration is attenuated. A mathematical model is developed based on the equivalent current method to calculate the electromagnetic control force produced by EMCLD. The governing equations of the system are obtained using Hamilton＇s Principle and then reduced with the assumed-mode method. A simulation on vibration control of a cantilever beam is conducted under the velocity proportional feedback to demonstrate the energy dissipation capability of EMCLD, and the beam system with the same parameter is experimented. The results of experiment and simulation are compared and the results show that the EMCLD is an effective means for suppressing modal vibration. The results also indicate that the beam system has better control performance for larger control current. The EMCLD method presented in this paper provides an applicable and efficient tool for the vibration control of structures.