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- Title
Modeling and Vibro-acoustic Characterization of Elastic Plate-Irregular Hexahedral Acoustic Cavity Coupling Systems.
- Authors
Jinlong, Liao; Haichao, Zhu; Jiuxiao, Hou; Suwei, Yuan
- Abstract
Purpose: Modeling of elastic plate-irregular hexahedral acoustic cavity coupling systems is a common structural–acoustic coupling problem in which accurate vibro-acoustic characterization is essential for noise control. Methods: This paper proposes a semi-analysis method. First, the irregular hexahedral acoustic cavity was mapped to the regular acoustic cavity and the Lagrangian functions of the elastic plate system and the acoustic field system were obtained according to the energy principle. Then, the kinetic equation of the coupling system was built using the Rayleigh–Ritz method. The relationship between the acoustic pressure mode amplitude vector and the structural mode amplitude vector was established based on the kinetics equation. The acoustic potential energy was then expressed as a quadratic form of the structural mode amplitude vector, and the acoustic radiation mode of the elastic plate-irregular hexahedral acoustic cavity coupling system was derived. Results: Taking the elastic plate-irregular hexahedral acoustic cavity coupling system as an example, the accuracy of the proposed method was verified by comparing the free and forced vibration results calculated with calculation examples and finite element method. On that basis, the coupling mechanisms of weak and strong coupling systems were discussed. In addition, the effects of cavity depth and plate thickness on the natural characteristics and the effects of wall impedance on the forced response were analyzed, and the acoustic radiation mode characteristics of the elastic plate-irregular hexahedral acoustic cavity coupling system were investigated in depth. Conclusion: This research provided a theoretical reference for the active structural acoustic control of elastic plate-irregular hexahedral acoustic cavity coupling systems.
- Subjects
ACOUSTIC couplers; ACOUSTIC radiation; SOUND pressure; ACOUSTIC field; RAYLEIGH-Ritz method; LAGRANGIAN functions; QUADRATIC forms
- Publication
Journal of Vibration Engineering & Technologies, 2023, Vol 11, Issue 8, p3797
- ISSN
2523-3920
- Publication type
Article
- DOI
10.1007/s42417-022-00783-7