Test study on vibration reduction performance of tuned liquid damper with built-in rotatable baffles

ZHANG Lanfang1, XIE Zhuangning1, ZHOU Zijie1, PENG Zhaocai2

Journal of Vibration and Shock ›› 2023, Vol. 42 ›› Issue (19) : 64-69.

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PDF(1957 KB)
Journal of Vibration and Shock ›› 2023, Vol. 42 ›› Issue (19) : 64-69.

Test study on vibration reduction performance of tuned liquid damper with built-in rotatable baffles

  • ZHANG Lanfang1, XIE Zhuangning1, ZHOU Zijie1, PENG Zhaocai2
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Abstract

The performance of tuned liquid damper (TLD) with rotatable baffles is investigated using shaking table tests. The measured response of wave height is decoupled and then the modal frequency and damping ratio are identified by different parameter identification methods. The influence of baffle location and angle () between the baffle and the direction of fluid sloshing on TLD performance is considered. The results show that the modal frequency and corresponding modal response of TLD decrease with the increase of due to the influence of the added mass and energy dissipation of the baffles, but the influence of the added mass on the frequency is not enough to cause the TLD’s mistuning. When  is less than 60°, the damping ratio increases monotonically with the change of  up to about 8%. When  is greater than 60°, the damping effect generated by the baffles reduces the first-order modal response and makes the sloshing in the form of the high-order mode, resulting in a significant increase of the sloshing frequency. This result is essentially different from the existing finding that the modal frequency of TLD increases gradually with the increase of , which means that the tuning of TLD cannot be realized by changing . However, changing  can easily adjust the damping ratio of TLD to achieve the optimal value required for the vibration control.

Key words

tuned liquid damper / rotatable baffle / shaking table test / mode decoupling / performance parameter.

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ZHANG Lanfang1, XIE Zhuangning1, ZHOU Zijie1, PENG Zhaocai2. Test study on vibration reduction performance of tuned liquid damper with built-in rotatable baffles[J]. Journal of Vibration and Shock, 2023, 42(19): 64-69

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