Motion control of a multi-layer multi-modal platform structure with a tuned liquid damper

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Journal of Vibration and Shock ›› 2023, Vol. 42 ›› Issue (14) : 30-39.

DOU Peng1，WANG Zhidong1，LING Hongjie2，XU Xiaosen2

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Abstract

Based on the two-way fluid structure coupling theory, the numerical model of tuned liquid damper (TLD) and multi-layer multi-modal platform structure was established in this paper. The effects of TLD damping frequency and installation height on the first two resonant modes of multi-layer structure were systematically studied. The damping force has been quantified by numerical method. Combined with the phase delay relationship of sloshing wave and platform motion, the damping characteristics of TLD on multi-layer multi-modal platform structure were analyzed. The results show that the control effect of different installation positions of TLD is related to the maximum vibration mode of the corresponding mode of the structure. The damping frequency band of TLD can be widened by the frequency doubling excitation generated in the sloshing process. In addition, keeping the mass ratio of 2% unchanged, the multi-TLD system has a more stable vibration reduction effect on the multi-layer structure without local negative excitation. The average vibration reduction ratio at the two resonance points is better than that of other schemes.

Key words

tuned liquid damper (TLD) / fluid solid coupling / numerical simulation / multi-layer platform structure

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DOU Peng1，WANG Zhidong1，LING Hongjie2，XU Xiaosen2. Motion control of a multi-layer multi-modal platform structure with a tuned liquid damper[J]. Journal of Vibration and Shock, 2023, 42(14): 30-39

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