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Smart Structures and Systems Volume 35, Number 1, January 2025 , pages 1-13 DOI: https://doi.org/10.12989/sss.2025.35.1.001 |
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Multi-mode vibration control of substation steel pipe lightning rods by multi-mode TMDs |
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Junchen Ye, Huawei Niu, Jinlin Chen, Fengli Yang, Guo Huang, Zhengqing Chen, Guowen Ran, Linwei Ding, Hong Tang and Xi Zhang
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| Abstract | ||
| A novel multi-mode eddy current tuned mass damper (TMD) is proposed and designed to effectively control windinduced vibrations of substation lightning rod structures. The TMD eliminates the need for springs and utilizes the resonant characteristics of a cantilever beam and a single pendulum, enhancing spatial efficiency. Rigorous validation through on-site measurements confirms the vibration reduction performance of the TMD. The modal damping ratios of the top ten modes for steel pipe structure of the substation lightning rod generally remain below 3‰. The multi-mode TMD significantly reduces the root-mean-square (RMS) acceleration response of the original lightning rod structure by 50%, and increases the modal damping ratio of each target mode by 5‰ on average. The additional modal damping of the fourth mode reaches 1%. The state space equation of the TMD-structure model is established, and the TMD design steps considering the additional mass of the device are proposed based on the complex mode analysis. The optimization of the TMD parameters (mass ratio, frequency ratio and damping ratio) is performed to minimize the response of the structure under wind excitation. With the increase of mass ratio, mode order and structure damping ratio, the optimal frequency ratio decreases, but the optimal damping ratio increases. It is necessary to set the corresponding optimal frequency ratio and optimal damping ratio by global optimization to ensure the optimal damping effect of TMD. | ||
| Key Words | ||
| field measurement; lightning rod; modal damping ratio; TMD; vibration control | ||
| Address | ||
| (1) Junchen Ye, Huawei Niu, Jinlin Chen, Zhengqing Chen: State Key Laboratory of Bridge Engineering Safety and Resilience, Changsha, Hunan, 410082, China; (2) Junchen Ye, Huawei Niu, Jinlin Chen, Zhengqing Chen: Key Laboratory for Bridge and Wind Engineering of Hunan Province, Hunan University, Changsha 410082, China; (3) Fengli Yang, Guo Huang: China Electric Power Research Institute, Beijing, 100055, China; (4) Guowen Ran, Linwei Ding, Hong Tang, Xi Zhang: Central China Branch of Guangdong Energy Group Guizhou Co., Ltd, Changsha, Hunan, 410000, China. | ||