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Abstract: Ultrasonic guided waves have been successfully applied in nondestructive evaluation (NDE) and structural health monitoring (SHM) of pressure vessels and pipelines due to their advantages, such as long detection range and high inspection efficiency. Compared with other ultrasonic guided wave actuators, magnetostrictive transducers are more cost-effective, involve simpler fabrication process, and have higher possible transduction efficiency. The normal mode expansion (NME) method is adopted to analyze the forced response and perturbation analysis of elastic hollow cylinders with respect to magnetostrictive loadings, including partial loading, axial array loading, and circular array loading. The phase velocity and frequency spectra of axisymmetric/non-axisymmetric guided waves excited by magnetostrictive transducers are analyzed. The theoretically predicted trends are verified by finite element numerical simulations and experiments.

Using the Normal Mode Expansion method, this manuscript (MS) analyzed the forced response and perturbation analysis of elastic hollow cylinders with respect to magnetostrictive loading. Finite element simulations and experiments verified the theoretical results. Some interesting results were found, such as "Magnetostrictive partial loading is able to excite guided wave modes in the same family, but has poor phase velocity and frequency selectivity."

弹性空心圆柱体中对称与非对称导波的磁致伸缩换能器激励

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