Study on Fluid System for Dynamic Control of Huge Structure

降低结构的这种噪声和振动的需求已经成为更重要的课题，例如，由于诸如风、地震、交通等的外部干扰，或者由于诸如发动机、波浪等的振动产生源而引起的诸如船舶和浮式结构的海洋结构的振动。研究了大型结构的动力控制问题。控制系统由调谐阻尼器和振动作动器组成。调谐质量阻尼器和调谐液体阻尼器被用作调谐阻尼器。由调谐阻尼器和作动器组成的控制系统称为混合型减振器。利用结构模型进行了试验研究，并与数值模拟结果进行了比较，得出以下结论：（1）试验结果与数值模拟结果吻合较好。(2)验证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比传统的主动质量阻尼器系统所需的控制力和功率小得多。(4)由于调谐液体阻尼器利用的是U形贮箱中的流体，因此不需要特殊的机构来支撑巨大的质量，证实了液体阻尼器作为调谐阻尼器应用于大型结构的混合振动控制系统具有良好的特性。

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.