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An enhanced performance scythe-shaped bending-torsion coupling wind energy harvester excited by magnetic force

Author

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  • Hou, Chengwei
  • Shan, Xiaobiao
  • Du, Xuteng
  • Chen, Yifeng
  • Zhang, Xiaofan
  • Xie, Tao

Abstract

Piezoelectric energy harvesters leveraging wind energy provide a solution for autonomous power in wireless electronic devices, driving advancements in wireless sensor networks and IoT technologies. This work presents a magnetic-excited scythe-shaped wind energy harvester (S-WEH) inspired by traditional scythes. The piezo oscillator comprises a vertical piezo beam and a horizontal auxiliary beam, mimicking the silhouette of a scythe. The motion of auxiliary beam impacts the piezo beam, inducing torsion during first-order vibration and bending during second-order vibration. Consequently, this work focuses on the influence of the auxiliary beam on the vibration response and power generation performance of the piezo beam. A combination of theoretical modelling and finite element analysis is employed to streamline the complex magnet-solid-electric multi-physics finite element calculations, with the method's validity and applicability validated through experimental results. Findings indicate that, with an auxiliary beam length, La, of 20 mm–50 mm, and a tip mass, ma, of 8.4 g, increasing the length of auxiliary beam reduces the average voltage at the first-order resonance by 83.8 %, but boosts it at the second-order resonance by 166.1 %. Besides, at a wind speed of about 9 m/s, the S-WEH successfully transmitted temperature data to a mobile device after charging a Bluetooth temperature sensor for 5 s.

Suggested Citation

  • Hou, Chengwei & Shan, Xiaobiao & Du, Xuteng & Chen, Yifeng & Zhang, Xiaofan & Xie, Tao, 2025. "An enhanced performance scythe-shaped bending-torsion coupling wind energy harvester excited by magnetic force," Energy, Elsevier, vol. 321(C).
    • Handle: RePEc:eee:energy:v:321:y:2025:i:c:s0360544225011077
    DOI: 10.1016/j.energy.2025.135465
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    References listed on IDEAS

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