Study on Fluid System for Dynamic Control of Huge Structure

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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.