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Omnidirectional Lamb waves by axisymmetrically-configured magnetostrictive patch transducer.

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    A novel magnetostrictive patch transducer (MPT) generates omnidirectional Lamb waves in plates. The study details its mechanism, finding optimal wave generation when wavelength is two-thirds of the patch diameter.

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    Area of Science:

    • Materials Science
    • Acoustics
    • Solid Mechanics

    Background:

    • Magnetostrictive patch transducers (MPTs) are established for wave transduction.
    • Previous research has not reported omnidirectional Lamb wave generation in plates using MPTs.

    Purpose of the Study:

    • To introduce a novel MPT design for omnidirectional Lamb wave generation.
    • To investigate the underlying mechanism and frequency characteristics of Lamb wave generation by the proposed MPT.

    Main Methods:

    • Development of an axisymmetrically-configured MPT with a specific coil and magnet arrangement.
    • Experimental confirmation of the omnidirectivity of the generated Lamb waves.
    • Analysis of Lamb wave generation efficiency and frequency dependence.

    Main Results:

    • The proposed MPT successfully generates omnidirectional Lamb waves in a plate.
    • Optimal Lamb wave generation occurs when the wavelength is approximately two-thirds of the magnetostrictive patch diameter.
    • The second radial extensional vibration mode of the MPT patch is identified as the primary mode for Lamb wave generation.

    Conclusions:

    • The novel MPT design enables efficient omnidirectional Lamb wave generation.
    • The relationship between wavelength and patch diameter is critical for efficient wave generation.
    • Understanding the vibration modes of the MPT provides insight into Lamb wave generation mechanisms.