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| Acoustic-vibration modeling and mechanism of finite cylindrical shell-flow field partially coupled system |
| GUO Wenjie, YANG Zhou |
| School of Transportation Engineering，East China Jiaotong University， Nanchang 330013, China |
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Abstract The partial coupling systems of cylindrical shells and fluid fields are widely used in engineering practice, their vibroacoustic performance is related to the structural safety and functionality. In addition, since the free surface reflects sound waves and the fluid loads are discontinuous in the circumferential distribution of the structures, they also contain abundant academic content. Therefore, the vibrational study of a partially coupled system is carried out in this paper. Firstly, the mathematical and physical models of the systems are established by using two different coordinate systems of sound field and structure. Afterwards, by using Galerkin method to deal with the velocity continuous condition on the acoustic-structure coupling surface, the matrix relation of the coefficient vector of the sound field and the displacement field is obtained, and then the vibration quantity can be solved theoretically. By Comparing with the results of simulation, the accuracy of the present method is verified, and it also has the advantages of wide application and less computation. In addition, the present method is extended to deal with the internal fluid field. Meanwhile, the similarities and differences of the free vibration characteristics between the partially fluid-filled case and the partially submerged case are compared, and the cause of their formation is revealed from the mathematical mechanism.
Key words: partially submerged cylindrical shell; partially fluid-filled cylindrical shell; two different coordinate systems; Galerkin method; acoustic-structure coupled vibration
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Received: 19 April 2021
Published: 15 August 2022
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