含MR阻尼器的简支梁振动响应分析

Vibration response analysis of simply supported beam with MR damper

基于由粘性阻尼和回滞阻尼组成的阻尼模型,对磁流变(MR)流体的动力学特性进行了研究.应用迭代摄动法讨论了含有MR阻尼器的振动系统的非线性频谱并且给出了带有MR流体阻尼器梁结构的计算结果,并应用Newm ark数值积分方法分析了带有MR阻尼器梁结构的多自由度振动系统在不同磁场强度和激励频率作用下的位移响应情况.结果表明,系统的刚度和响应的变化可以通过外加磁场强度来控制,随着磁场强度的增加,响应幅值减小,结构的刚度变大.

Using the viscous and bilinear hysteresis damping model, its dynamical properties of mag- neto- rheological （MR） fluid is analyzed. The nonlinear frequency spectrum by iterative perturbation method for vibration system with MR damper was discusses and the numerical results of a beam structure with MR damper are given. The displacement simulation of the response of the vibration system with an MR damper has been given under different strength of applied external magnetic field and under excitation with different frequencies. The Newmark method is also used to perform the numerical integration with the same parameters as that of the SDOF system. It is reached as a conclusion that the stiffness and response of vibration system can be changed by control of strength of electric field, the resonance amplitude decrease as the strength of the applied electric field to the MR damper increase and the stiffness of vibration system increase as the strength of the applied electric field to the MR damper increase.