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| Frequency Identification Method of Underwater Acoustic-solid Coupling System Based on Acoustic Scattering Wave |
| Received:April 23, 2024 Revised:May 02, 2024 |
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| DOI：10.7643/issn.1672-9242.2024.08.016 |
| KeyWord:acoustic scattered wave Hilbert-Huang transform system frequency identification empirical mode decomposition (EMD) acoustic-solid coupling |
| Author | Institution |
| XIAO Wei |
Institute of Systems Engineering, China Academy of Engineering Physics, Sichuan Mianyang , China |
| LI Shangming |
Institute of Systems Engineering, China Academy of Engineering Physics, Sichuan Mianyang , China;Shock and Vibration of Engineering Materials and Structures Key Laboratory of Sichuan Province, Sichuan Mianyang , China |
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| Abstract: |
| The work aims to propose a natural frequency identification method based on submerged structural scattered sound pressure response to meet the requirement of natural frequency identification of submerged acoustic-structure coupling systems. The time-domain scattered sound pressure of the structure submerged in infinite water was calculated by the finite element method, and the characteristic frequency of each modal component in the acoustic scattered wave was identified by Hilbert-Huang transform. In view of the existence of false modes and mode aliasing in the empirical mode decomposition (EMD) step of the traditional HHT method, the correlation coefficient test method was applied to eliminate false mode components, and the combination of spectrum analysis and filtering technology was used to avoid the influence of mode aliasing, which improved the accuracy of HHT method in identifying the natural frequencies of submerged structures. Based on the method, the natural frequency of the system such as submerged cylindrical shell and slab was identified, which verified the accuracy of the method. The identification results show that the proposed method can effectively identify the main natural frequencies of the acoustic-solid coupling system. |
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