4.7 Article

Broadband torsional guided wave magnetostrictive patch transducer with circumferential alternating permanent magnet array for structural health monitoring

期刊

ULTRASONICS
卷 125, 期 -, 页码 -

出版社

ELSEVIER
DOI: 10.1016/j.ultras.2022.106805

关键词

Magnetostrictive patch transducer; Alternating permanent magnet array; Torsional guided wave; Frequency sweeping detection; Structural health monitoring

资金

  1. Pre-research Project for Civil Aero-space Technology [JZKGJ20190004]
  2. National Natural Science Foundation of China [51977044]

向作者/读者索取更多资源

This paper proposes a broadband torsional guided wave MPT based on T(0,1) guided waves and verifies its bandwidth and wavelength characteristics through experiments. By using frequency sweeping detection, through-hole defects of different sizes can be quantitatively analyzed, and the remaining service life of the test specimen can be predicted more accurately.
T(0,1) guided wave is non-dispersive and has been widely used in the long distance inspection and condition monitoring. Magnetostrictive patch transducer (MPT) is a new type of EMAT with high energy conversion ef-ficiency, which can be used to generate and receive torsional guided waves in pipe samples. In this paper, a permanent magnet broadband torsional guided wave MPT composed of a linear coil EMAT array is proposed. The MPT was experimentally verified to be broadband and the bandwidth is 230.79 kHz when using a 5 mm wide linear coil. The wavelength corresponding to the center frequency of the transducer is about 0.6 times the width of the coil. Base on the design, through-hole defects with diameters of 3-6 mm in the 2-mm-thick aluminum plate were quantified by frequency sweeping detection, and the relative error is less than 7 %. Compared with the single-frequency guided wave signal reflected by through-hole defects, the variation pattern of the quantitative results using frequency sweeping can contribute to a more accurate prediction of the remaining service life of the test specimen.

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