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Structural Engineering and Mechanics Volume 65, Number 4, February25 2018 , pages 359-368 DOI: https://doi.org/10.12989/sem.2018.65.4.359 |
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Substructure/fluid subdomain coupling method for large vibroacoustic problems |
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Rabii El Maani, Abdelkhalak El Hami and Bouchaib Radi
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| Abstract | ||
| Dynamic analysis of complex and large structures may be costly from a numerical point of view. For coupled vibroacoustic finite element models, the importance of reducing the size becomes obvious because the fluid degrees of freedom must be added to the structural ones. In this paper, a component mode synthesis method is proposed for large vibroacoustic interaction problems. This method couples fluid subdomains and dynamical substructuring of Craig and Bampton type. The acoustic formulation is written in terms of the velocity potential, which implies several advantages: coupled algebraic systems remain symmetric, and a potential formulation allows a direct extension of Craig and Bampton\'s method to acoustics. Those properties make the proposed method easy to implement in an existing finite element code because the local numerical treatment of substructures and fluid subdomains is undifferentiated. Test cases are then presented for axisymmetric geometries. Numerical results tend to prove the validity and the efficiency of the proposed method. | ||
| Key Words | ||
| component mode synthesis; substructure; subdomain; vibroacoustic; finite element; fluid-structure interaction | ||
| Address | ||
| Rabii El Maani: 1) LMN, INSA de Rouen, Avenue de l\' Universite, 76800 Saint Etienne de Rouvray, France 2) LIMII, FST Settat, route de Casablanca, Settat, Maroc Abdelkhalak El Hami: LMN, INSA de Rouen, Avenue de l\' Universite, 76800 Saint Etienne de Rouvray, France Bouchaib Radi: LIMII, FST Settat, route de Casablanca, Settat, Maroc | ||