A new theoretical model for high-order harmonics of SH0 mode ultrasonic guided waves based on magnetostrictive mechanism

IF 3.8 2区物理与天体物理 Q1 ACOUSTICS Ultrasonics Pub Date : 2024-09-30 DOI:10.1016/j.ultras.2024.107480

Huan Wang , Xiucheng Liu , Bin Wu , Xiang Gao , Yao Liu , Cunfu He

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Abstract

In recent years, it was found that magnetostrictive ultrasonic guided wave transducers experimentally excited nonlinear harmonic components under a certain combination of dynamic and static magnetic fields. However, a satisfactory model for the relevant excitation mechanisms is not available. In this study, a new magnetostrictive guided wave excitation model was established and the causes for harmonics generation were analyzed. In addition, the calculation results of the model were obtained under different magnetic field parameters. We firstly changed the calculation conditions of magnetostrictive strain in the model and then theoretically calculated the odd and even harmonics of SH₀ mode ultrasonic guided waves for the first time. Furthermore, the accuracy of the model was experimentally verified. By changing the strength ratio of the dynamic magnetic field to the static magnetic field (H_D/H_S), the excitation amplitudes of odd and even harmonics could be regulated with a magnetostrictive sensor. As the ratio of H_D/H_S increased, the normalized amplitude of the second harmonic firstly increased and then decreased, whereas the normalized amplitude of the third harmonic showed an exponential growth with different curvatures. This study enriched the theory of magnetostrictive guided wave excitation and provided a theoretical basis for the applications of magnetostrictive sensors.

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基于磁致伸缩机制的 SH0 模式超声导波高阶谐波新理论模型。

近年来，人们发现磁致伸缩超声导波换能器在一定的动静态磁场组合下会激发非线性谐波成分。然而，目前还没有一个令人满意的相关激励机制模型。本研究建立了一个新的磁致伸缩导波激励模型，并分析了谐波产生的原因。此外，还获得了该模型在不同磁场参数下的计算结果。我们首先改变了模型中磁致伸缩应变的计算条件，然后首次从理论上计算了 SH0 模式超声导波的奇次谐波和偶次谐波。此外，还通过实验验证了模型的准确性。通过改变动态磁场与静态磁场的强度比（HD/HS），可以利用磁致伸缩传感器调节奇次谐波和偶次谐波的激励幅值。随着 HD/HS 比值的增大，二次谐波的归一化振幅先增大后减小，而三次谐波的归一化振幅则呈现出不同曲率的指数增长。这项研究丰富了磁致伸缩导波激励理论，为磁致伸缩传感器的应用提供了理论依据。

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来源期刊

Ultrasonics 医学-核医学

CiteScore

7.60

自引率

19.00%

发文量

186

审稿时长

3.9 months

期刊介绍： Ultrasonics is the only internationally established journal which covers the entire field of ultrasound research and technology and all its many applications. Ultrasonics contains a variety of sections to keep readers fully informed and up-to-date on the whole spectrum of research and development throughout the world. Ultrasonics publishes papers of exceptional quality and of relevance to both academia and industry. Manuscripts in which ultrasonics is a central issue and not simply an incidental tool or minor issue, are welcomed. As well as top quality original research papers and review articles by world renowned experts, Ultrasonics also regularly features short communications, a calendar of forthcoming events and special issues dedicated to topical subjects.