Abstract
The torsional guided wave magnetostrictive transducer (MsT) based on the reversed Wiedemann effect has received much attention because of its high energy conversion efficiency and easy implementation of bias magnetic field. However, the coil is wound on the magnetostrictive patch which leads to the reduced coupling efficiency. And the coil winding process for MsT is also time-consuming. This paper proposes a new design of torsional guided wave MsT with circumferential alternating permanent magnet array. The permanent magnets with axial direction magnetization are alternately arranged along the circumference of the pipe. The meander coil is placed between the permanent magnet array and the pipe. On this basis, a magnetic circuit device is applied to increase the amplitude and uniformity of the bias magnetic field, making the transducer to achieve larger energy conversion efficiency. It has been proved experimentally that the designed MsT can generate T (0,1) guided wave with stronger energy. The amplitude of the guided wave signal increases by 2.8 times with the same excitation conditions. Moreover, the transducer has a wide bandwidth. Its center frequency corresponds to the wavelength λ, and the magnetostrictive patch width is about 0.5 λ or 1.5 λ. In conclusion, the proposed transducer has higher energy conversion efficiency and is also easier to design and install, making it more suitable for the health monitoring of large industrial equipment.
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The datasets used or analyzed during the current study are available from the corresponding author on reasonable request.
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Acknowledgements
This work was supported by the Pre-research Project for Civil Aerospace Technology (No.JZKGJ20190004); the National Natural Science Foundation of China (No. 51977044); and the National Natural Science Foundation of China (No.51807052). The authors are grateful for the financial support.
Funding
(1) Pre-research Project for Civil Aerospace Technology (No.JZKGJ20190004).
(2) National Natural Science Foundation of China (No. 51977044).
(3) National Natural Science Foundation of China (No.51807052).
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CL: got the data, analyzed the data and wrote the main manuscript text. RY: got and analyzed the experimental data. JG, SW and XZ: revised the manuscript critically for important intellectual content. All authors reviewed the manuscript.
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Li, C., Yang, R., Gu, J. et al. Optimized Design of Torsional Guided wave Magnetostrictive Patch Transducer Based on Reversed Wiedemann Effect. J Nondestruct Eval 42, 26 (2023). https://doi.org/10.1007/s10921-023-00935-z
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DOI: https://doi.org/10.1007/s10921-023-00935-z