电流变弹性体夹层结构梁动力学特性分析

Dynamic Analysis of Sandwich Beams Filled with ER Elastomers

将电流变弹性体材料等效为粘弹性阻尼材料,运用夹层梁理论和广义Hamilton原理,建立了电流变弹性体夹层结构梁的动力学模型,并对其动力学特性进行仿真分析.仿真结果表明,随着外加电场强度的增加,电流变弹性体夹层结构梁的刚度和模态损耗因子得到提高,系统的振动也会减小;增加电流变弹性体夹层的厚度,能降低系统的固有频率,但同时也可以提高模态损耗因子.表明电流变弹性体夹层结构梁具有与电流变液夹层梁相似的动力学特性,在外加电场的作用下,能增大结构的阻尼损耗,有效抑制系统的振动.

Considered electrorheological （ER） elastomers as the visco-elasticity material, a dynamic model of a sandwich beam filled with ER elastomers is developed based on Hamilton＇s principle and sandwich beam＇s theory. Then its dynamic characteristics are analyzed and simulated. Results show that natural fre- quencies of the ER elastomers sandwich beam increase and vibration amplitudes of the beam decrease as the intensity of applied electric field increases, when the thickness of the ER elastomers layer is increased, nat- ural frequencies of the beam decrease and loss factors increase. Those indicate that the dynamic character- istic of ER elastomers sandwich beams is similar to that of ER fluids sandwich beam, which increases the damping loss factors of the structure and efficiently controls the vibration amplitudes of the system are with an additional electric field.