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| Applicability of bridge vibration energy harvester based on nonlinear energy sink |
| YANG Xingsen1, LI Zhaoyu2, WANG Shaohua2, DOU Yinling1,3, ZHAN Yulin1, ZHAO Renda1 |
1.School of Civil Engineering, Southwest Jiaotong University, Chengdu 610031, China;
2.Department of Mechanical Engineering, The University of Auckland, Auckland 1010, New Zealand;
3.MOE Key Lab of High-speed Railway Engineering, Southwest Jiaotong University, Chengdu 610031, China |
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Abstract As a classical vibration control technology, nonlinear energy sink (NES) has been innovatively combined with approaches to harvest vibration energy in recent years, and a series of research efforts had been made. For health monitoring system of bridges, energy supplying of the sensors has always been a problem needed improving. Exploring the applicability of vibration energy harvester based on nonlinear energy sink to bridges, which is of great theoretical and practical significance. Taking a simply supported railway girder bridge as example, this work investigates the applicability of vibration energy harvester based on the nonlinear energy sink to the bridge. Firstly, mechanical properties and parameters of the NES are characterized. Subsequently, dynamic responses and energy harvesting effect of the NES under different initial excitation conditions are evaluated using the vertical coupling dynamics theory of vehicle-track-bridge and the finite element method. The results show that the NES with weak linear stiffness and strong nonlinear stiffness installed on the bridge is sensitive to initial displacement, and targeted energy transfer (TET) is excited only if initial displacement reaches a certain threshold. Moreover, TET cannot be excited when initial energy input cannot surpass the critical threshold, so the energy harvesting efficiency is poor. Based on the results of numerical analysis, the proposed NES can take full advantage of nonlinear characteristics under appropriate vibration excitation of the bridge, so as to obtain excellent energy harvesting efficiency.
Keywords: bridge vibration; nonlinear energy sink; piezoelectric vibration energy harvesting; targeted energy transfer
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Received: 24 June 2021
Published: 15 October 2022
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