Realization of High Performance Tuned Liquid Damper based on Nonlinearity Control and Damping Control

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In this research project, to establish the method of calculation for predicting the performance of various types of Tuned Liquid Dampers (TLDs), the following studies with three types of TLDs were conducted.(1) Deep water type cylindrical damperBasic theory for describing the performance of this type of TLD is first derived and then the case with a single net inserted in the middle of the cylinder is investigated .Finally, the simulation code is developed based on the proposed theory which was verified by the experimental results. In the experiment, open area ratio of the inserted net, mass ratio between TLD and main structure, initial amplitude, liquid depth ratio were selected as design parameters.(2) Rectangular damperStarting from well established theory for rectangular TLD developed by authors, two cases such as the case with multiple nets inserted perpendicular to the bottom wall of a rectangular container and the case with two nets inserted perpendicular to each side wall of a rectangular container were investigated to achieve higher performance of rectangular TLDs. With these two cases, simulation code is developed based on the proposed analytical model, the results of which were compared with experimental results.(3) Variable damping TLDTo develop a variable damping TLD,basic studies were performed with a rectangular TLD with steady inlet and outlet flow. First, to investigate the resonant characteristics of sloshing in a rectangular container with steady inlet and outlet flow, shaking table tests were performed and corresponding nonlinear analysis based on perturbation method is conducted. Succedingly, the difference of the dissipation energy produced by TLDs with and without steady inlet and outlet flow were investigated which gives us the result that TLD with steady inlet and outlet flow yields wider resonant range.