J0420201 円周方向に等間隔に設置された圧電式トランスデューサで励起される円周Lamb波の共鳴を利用した肉厚測定法 : 管軸方向に減肉分布を有する場合([J042-02]超音波計測・解析法の新展開(2),機械材料・材料加工部門)

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  • J0420201 Wall thinning measurement using resonant phenomena of the circumferential Lamb waves generated by plural transducers located evenly on pipe : Confirmation for axially distributing defects

抄録

Piezoelectric ring-shaped sensor (PeRS) has been widely used for guided wave inspection of piping. The PeRS is normally consisted of plural transducer elements located along circumference at regular interval. Due to the structure, in addition to the axially propagating torsional mode guided waves, circumferential (C-) Lamb waves have also been generated as spurious waves at the same time. Especially in the resonant conditions determined by both the specific frequencies and locations of sensor elements, the C-Lamb waves are dominantly and preferentially generated as actual spurious signals that may distort axially propagating waves. In this paper, this troublesome phenomenon is used not for the axially propagating guided waves but usefully for the measurements of wall thicknesses. The Principle, the verification and the accuracy of the measurements were shown.

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  • 年次大会

    年次大会 2014 (0), _J0420201--_J0420201-, 2014

    一般社団法人 日本機械学会

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