磁控摩擦阻尼器对信号塔的地震反应控制

摘要

针对常摩擦阻尼器摩擦力恒定的问题，设计一种新型筒式磁控变摩擦阻尼器，并建立磁控变摩擦阻尼器的力学模型。以机场信号塔结构为工程背景，将信号塔的三维空间有限元模型简化为二维串联多自由度模型；采用LQG主动控制算法和界限Hrovat半主动控制策略对磁控变摩擦阻尼器实施控制；讨论常摩擦阻尼器被动控制和磁控摩擦阻尼器半主动控制对地震作用下信号塔结构振动响应的控制效果。计算结果显示，磁控摩擦阻尼器的半主动控制取得明显优于常摩擦阻尼器被动控制的减振效果，在实际工程中有着良好的应用前景。%To cope with the issue of constant slip force of passive friction dampers, a new type barrel electromagnet friction damper was designed. The mechanical models of the passive friction damper and the magnetic friction damper were introduced respectively. With the airport signal tower structure as the research background, a three-dimensional finite element static model was established by means of ANSYS. Then, based on some assumptions, the three-dimensional model was simplified to a series of two-dimensional lumped mass dynamic models. The vibration control effects of the passive friction damper and the magnetic friction damper for the airport signal tower under the earthquake were discussed. Results of this study show that the semi-active control of the magnetic friction damper performs much better than the passive control of the passive friction damper. It may have a good prospect in actual engineering application.