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Theoretical and Numerical Studies on in vacuo Structural Admittance of an Infinite, Coated Cylindrical Shell

  • CLASSICAL PROBLEMS OF LINEAR ACOUSTICS AND WAVE THEORY
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Abstract

Studying the interaction of sound with a coated cylindrical shell immersed in water is essential for improving existing underwater target detection and classification algorithms. According to the impedance theory of sound scattering, in vacuo structural admittance describes the relationship between the sonar-induced forces and the resulting vibration on the surface, which can be used to solve the problem of the acoustic scattering and radiation. In this work, we investigate numerically and theoretically the structural admittance of a coated cylindrical shell. Analytical expressions of the structural admittance are derived for different external forces: a plane acoustic wave, a normal point force, and a random noise field. The structural admittance is also numerically evaluated. The results show that the structural admittance is independent of exterior medium and fluid loading. According to the impedance theory of sound scattering, the scattered field of a coated cylindrical shell is calculated by combining the structural-, acoustic-, and internal-admittance matrices. Because of the non-local property of structural surface admittance, we build an algebraic model of a coated object by nonlinear curve fitting and study a local approximation of the structural admittance. We also find that simplifying the large matrices is useful for research on structural vibrations. Thus, this work presents a systematic study of the acoustic scattering characteristics of structural admittance of an infinite, coated cylindrical shell.

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ACKNOWLEDGMENTS

The study was supported by the National Basic Research Program of China (973 Program), project no. 613247.

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Authors and Affiliations

  1. Collaborative Innovation Center for Advanced Ship and Deep-Sea Exploration, Shanghai Jiao Tong University, 200240, Shanghai, China

    Fulin Zhou, Bin Wang, Jun Fan & Zilong Peng

  2. State Key Laboratory of Ocean Engineering, Shanghai Jiao Tong University, 200240, Shanghai, China

    Fulin Zhou, Bin Wang, Jun Fan & Zilong Peng

  3. School of Energy and Power Engineering, Jiangsu University of Science and Technology, 212003, Zhenjiang, China

    Zilong Peng

Authors
  1. Fulin Zhou
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  2. Bin Wang
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  3. Jun Fan
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  4. Zilong Peng
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Correspondence to Fulin Zhou, Bin Wang, Jun Fan or Zilong Peng.

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Fulin Zhou, Wang, B., Fan, J. et al. Theoretical and Numerical Studies on in vacuo Structural Admittance of an Infinite, Coated Cylindrical Shell. Acoust. Phys. 65, 14–22 (2019). https://doi.org/10.1134/S1063771019010184

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  • DOI: https://doi.org/10.1134/S1063771019010184

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