Study on Fluid System for Dynamic Control of Huge Structure

结构的减噪减振已成为更为重要的课题，例如多层建筑等陆地结构因风、地震、交通等外界干扰而产生的减振需求，以及船舶等海洋结构物因发动机、波浪等激振源而产生的减振需求。研究了巨型结构的动力控制问题。控制系统由调谐阻尼器和激振器组成。采用调谐质量阻尼器和调谐液体阻尼器作为调谐阻尼器。这种带有调谐阻尼器和执行器的控制系统称为混合阻尼器。利用结构模型进行了实验研究，并与数值模拟结果进行了比较，得到以下结论：(1)实验结果与数值模拟结果吻合较好。(2)证实了混合振动控制和本文方法的有效性。(3)本系统所需的控制力和功率远小于传统的主动质量阻尼器系统所需的控制力和功率。(4)调谐液体阻尼器利用U形储罐中的流体，不需要特殊的机构来支撑大质量，结果表明，液体阻尼器作为混合减振系统的调谐阻尼器具有良好的减振性能。

The demand for the reduction of such noise and vibration of structures has become more important subject, for example, that of land structures like multistoried building due to the external disturbances such as wind, earthquake, traffic, etc., or that of marine structures like ships and floating structures due to vibration generating sources such as engine, wave and so forth. A dynamic control of the huge structure is studied. The control system consists of a tuned damper and a vibration actuater. A tuned mass damper and a tuned liquid damper are used as the tuned damper. The control system accompanied with the tuned damper and the actuater is called as a hybrid vibration damper. Experimental studies are carried out using structural models and compared with the results of numerical simulation.The abtained conclusions are as follows :(1) The results of the experiment agree well with those of the numerical simulation.(2) The validity of the hybrid vibration control and the present method is confirmed.(3) The required control force and power of the present system are much smaller than those required for a conventional active mass damper system.(4) Since the tuned liquid damper make use of the fluid in a U-shaped tank, a special mechanism to support the huge mass is not required, It is confirmed that the liquid damper has good features as a tuned damper for the hybrid vibration control system applied to hage structures.