基于DMF研究地震作用下MSCSS的控制特性

Exploring Control Characteristics of Mega-Sub Controlled Structural System( MSCSS) under Earthquake Excitation Based on Dynamic Magnification Factor( DMF)

通过对巨子型结构体系(mega-sub controlled structure system,即MSCSS)的动力学方程进行推导,利用拉氏变换得到系统的传递函数,进一步表示出该新型控制结构体系在地震作用下所特有的位移动力放大系数(dynamic magnification factor,即DMF)表达式,以DMF为指标从理论层面揭示MSCSS的频域控制特性及动力响应特征。通过算例基于DMF分析主结构与子结构的参数(质量比、刚度比、附加阻尼比)设置对MSCSS调谐减震性能的影响,为建构不同层数MSCSS及合理的实体模型提供理论依据。

We deduce the dynamic equation of the mega-sub controlled structural system（MSCSS） and use the transfer function derived through the Laplace transform to obtain the expression of the dynamic magnification factor （ DMF） that represents the displacement typical of the MSCSS.Theoretically,we use the DMF as an indicator to re-veal the frequency domain control characteristics of the MSCSS and its dynamic response.The results of numerical a-nalysis based on the DMF,given in Figs.1 through 6,and their analysis show preliminarily that different settings of parameters such as the mass ratio,stiffness ratio and additional damping ratio of the MSCSS under earthquake exci-tation have different effects on its tuned vibration absorption performance.The exploration results provide theoretical bases for setting the parameters of the MSCSS with different layers and establishing its reasonable physical model.