双层圆柱壳的声散射:层厚对导波的影响

Q1 Arts and Humanities

Acta Acustica united with Acustica Pub Date : 2019-11-01 DOI:10.3813/aaa.919402

Y. Khandouch, E. Aassif, S. Agounad

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引用次数: 0

摘要

本文主要研究了双层不锈钢-铜和铜-不锈钢圆柱壳在水中充入空气后的声散射特性。本文的目的是揭示构成壳层的物理和几何特性对散射现象的影响。本工作的目的是在壳体总厚度固定的情况下，研究层厚对导波的影响。选取模态识别平面对散射现象进行分析。我们研究了导波的共振轨迹，特别是曲线的变化。对不同导波的共振轨迹进行了研究和比较，发现导波的共振轨迹出现了形状变化、逐渐偏离或两者兼有的现象，导波的截止频率降低后出现了向高值和向低值滑动的现象。导波之间的相互作用还表现为散射现象。然后将双层圆柱壳的结果与单层不锈钢和铜圆柱壳的结果进行了比较。然后，对A1波的截止频率进行了简化，提取了不同可能的中间半径值，从而完成了这项工作。在这一部分中，为了理解所观察到的现象，介绍了其他双层圆柱壳的例子。对所得结果进行了分析和研究。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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Acoustic Scattering from Bi-Layered Cylindrical Shells: Influence of the Layers Thicknesses on the Guided Waves

The current work focuses on the study of acoustic scattering from bi-layered stainless steel-copper and copper-stainless steel cylindrical shells filled with air and immersed in water. This paper is interested in revealing the effects of physical and geometrical characteristics of the layers constituting the shells on the scattering phenomenon. The object of this work, is to study the influence of the layers thicknesses on guided waves, the overall thickness of the shells is fixed. The plane of modal identification was chosen to analyze the scattering phenomenon. We investigate the resonance trajectories of the guided waves, especially the curves change. The investigation and comparison made on resonance trajectories, show a shape change, a gradual deviation, or both, appear on the resonance trajectories of different guided waves, for the reduced cutoff frequencies of guided waves a sliding to higher and lower value are noticed. The interaction between guided waves is also manifested in the scattering phenomenon. The findings for the bi-layered cylindrical shells are then compared with those obtained for the mono-layered stainless steel and copper cylindrical shells. Then, this work is completed by an investigation on the reduced cut-off frequencies of the A1 wave, that have been extracted for different possible values of the intermediary radius. In this part, to understand the observed phenomena, other examples of bi-layered cylindrical shells are introduced. The obtained results are analyzed and investigated.

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来源期刊

Acta Acustica united with Acustica 物理-声学

CiteScore

2.60

自引率

0.00%

发文量

审稿时长

6.8 months

期刊介绍： Cessation. Acta Acustica united with Acustica (Acta Acust united Ac), was published together with the European Acoustics Association (EAA). It was an international, peer-reviewed journal on acoustics. It published original articles on all subjects in the field of acoustics, such as • General Linear Acoustics, • Nonlinear Acoustics, Macrosonics, • Aeroacoustics, • Atmospheric Sound, • Underwater Sound, • Ultrasonics, • Physical Acoustics, • Structural Acoustics, • Noise Control, • Active Control, • Environmental Noise, • Building Acoustics, • Room Acoustics, • Acoustic Materials and Metamaterials, • Audio Signal Processing and Transducers, • Computational and Numerical Acoustics, • Hearing, Audiology and Psychoacoustics, • Speech, • Musical Acoustics, • Virtual Acoustics, • Auditory Quality of Systems, • Animal Bioacoustics, • History of Acoustics.