ETMD减振系统及其在海洋平台振动控制中的应用

扩展调谐质量阻尼器(ETMD)减振系统是TMD减振系统的延伸,是利用装置内部设备进行装置振动被动控制的技术.理论分析表明,随着ETMD与剩余平台质量比和频率比的增加,振动控制的频率使用范围扩大,共振的频带缩小.有限元分析结果表明,ETMD减振系统在频率接近激励的激振频率时,有较大的振动位移,可以更多地吸收海洋平台的振动能量;质量比在3.75到5之间时具有比较好的减振效果;频率比在0.3到0.35、0.35到0.5两个区间具有比较好的减振效果.当频率比在0.5到2之间时,系统总体振动都比较小.仿真研究同时表明,在传统导管架平台上ET-MD减振系统也具有良好的减振效果.

Extended turned mass damper (ETMD) and its application in the vibration control of offshore platforms

ETMD vibration control system is an extension of turned mass damper (TMD). It uses the equipments on the structure to control the vibration of the structure. The theoretical analysis shows that the usable frequency range of the vibration control system increases and the resonant frequency band decreases with the increases of the mass ratio and the frequency ratio of ETMD to residual structure. The simulation result using finite element method shows that, when the frequency of ETMD is near excitation frequency, ETMD vibration control system can generates greater displacement and therefore it can absorb the more vibration energy of offshore platform; it has better vibration control effect on the platform when the mass ratio is between 3.75 and 5.00 ; it has also better vibration control effect on the platform when the frequency ratio is in [0.30,0.35] and (0.35,5.00); when the frequency ratio is between 0.5 and 2.0, the whole system, including the platform and the ETMD, has a little vibration response. The simulation result shows that the ETMD has a good vibration control effect on traditional jacket platform.