中文摘要：

扩展的调谐质量阻尼器（ETMD）是一种新型的振动控制方法,其参数的取值影响减振控制效果。引入减振效果衡量系数R,在区间（0,1）之内R的取值越大表明ETMD的减振效果越明显,如果R取负值则表明ETMD系统不仅没有减振效果、反而增大了结构的反应。据此分析得出影响ETMD减振系统振动控制效果的3个参数,得到各参数与减振效果衡量系数的曲线图,研究了各参数的相互联系对减振效果的影响。建立海洋平台的有限元模型,选择合适ETMD的系统参数,在地震载荷作用下进行振动控制效果仿真,获取有ETMD减振系统和无ETMD减振系统情况下,海洋平台有限元模型节点的位移时程曲线。有限元分析表明,ETMD减振系统能够有效控制海洋平台在地震载荷作用下的振动。

英文摘要：

The system of Extended Tuned Mass Damper （ETMD） is a new controlling method. The parameter value of the ETMD system has influence on the effect of vibration control. In this paper, the authors introduce a parameter, coefficient R, to measure the effect of reducing vibration. The bigger R is evaluated between zero and one, the more apparently the system of ETMD reduces the vibration. If R is negative, the system of ETMD has no influence on the effect of reducing vibration; reversely it enhances the response of structures. Three parameters are derived based on the R. The factors of controlling vibration are analyzed in ETMD system and graphs of coefficient R are made. It is analyzed that the relation among parameters are how to affect the vibration. The finite-element model of offshore platform is established. Vibration control effect for offshore platform is analyzed finitely under the promptings of earthquake loadings. In order to compare ETMD system＇s control effect with No-ETMD system＇s, the time-history curve of finite point vibration displacement is obtained by using measurable parameter of ETMD system. The simulation shows that the ETMD system has marked effect for vibration control of offshore platforms.