Smart Structures and Systems

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Pedestrian- and wind-induced bi-directional compound vibration control using multiple adaptive-passive TMD-TLD system

  • Liangkun Wang (State Key Laboratory of Disaster Reduction in Civil Engineering, Tongji University) ;
  • Ying Zhou (State Key Laboratory of Disaster Reduction in Civil Engineering, Tongji University) ;
  • Weixing Shi (State Key Laboratory of Disaster Reduction in Civil Engineering, Tongji University)
  • Received : 2023.08.18
  • Accepted : 2024.08.05
  • Published : 2024.06.25
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Abstract

To control vertical and lateral compound vibration simultaneously using an integrated smart controller, passive tuned mass damper (TMD) and tuned liquid damper (TLD) are updated and combined to an adaptive-passive TMD-TLD (AP-TMD-TLD) system. As for the vertical AP-TMD part on top of the vertical spring, it can retune itself through varying the level of liquid in the tank to adjust its mass, while the lateral AP-TLD part at the bottom of the vertical spring can retune itself by changing the level of liquid. Further, for multimodal response control, the multiple AP-TMD-TLD (MAP-TMD-TLD) system is proposed as well. Each AP-TMD-TLD in the system can identify the structural vertical and lateral modal frequencies through the wavelet-transform (WT) based algorithm and retune its vertical and lateral natural frequencies both through adjusting the level of liquid in the AP-TMD and AP-TLD parts respectively. A cantilever cable-stayed landscape bridge which is sensitive to both human-induced and wind-induced vibrations is presented as a case study. For comparison, initial parameters of MAP-TMD-TLD are mistuned. Results show that the presented system can retune its vertical and lateral frequencies precisely, while the retuned system has a better bi-directional compound control effect than the mistuned system before the retuning operation and can improve the serviceability significantly.

Keywords

Acknowledgement

The authors are grateful for the financial support received from the National Natural Science Foundation of China (Grant no. 52308526, 52025083), National Key Research and Development Program of China (Grant no. 2022YFF0608903), and this study is also sponsored by Shanghai Pujiang Program (22PJ1413600), supported by the Fundamental Research Funds for the Central Universities (22120220573, 0200121005/174), and Scientific Research Fund of Institute of Engineering Mechanics, China Earthquake Administration (Grant No. 2023D02).

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