Abstract
In this chapter, we focus on the interaction between fluid and structure and specifically the vibro-acoustic problem which is generally defined as the contact between bodies interacting according to the principles of continuum mechanic. The comprehension of the mechanisms of these interaction has a capital importance in several industrial applications (aerospace, automotive, civil engineering areas as well as in biomechanics ...). When a structure vibrates in the presence of a fluid, there is interaction between the natural waves of each media: the fluid flow generates a structural deformation and/or the movement of a solid causes the displacement of the fluid. These applications require an effective coupling. For the coupling fluid structure finite elements models, the importance of the size reduction becomes obvious because the fluid degrees of freedom will be added to those of the structure. A method of condensation will be used to reduce the matrixes size. One of the principal hypotheses in the use of component mode synthesis method is that the model is deterministic; it is to say that parameters used in the model have a defined and fixed value. In fact, all aspects of an analysis model are uncertain. However, the fluctuations in input parameters generate significant degradation of the quality of the deterministic solution. So it is neither financially feasible nor physically possible to eliminate the dispersion of the input parameters. A numerical vibratory study is leaded on a structure 3D immersed in water taking the acoustic aspect. In this context, we focused very specifically on a deterministic and stochastic analysis through numerical simulations in 3D dynamic fluid-structure interaction problems. The results of the reliability based design optimization (RBDO) study of the marine propeller tend to show the effectiveness of the step followed to condense the system and to take into account the uncertain parameters.
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Radi, B., El Hami, A. (2015). Reliability Analysis of a Vibro-acoustique System: Application to a Marine Propeller. In: Belhaq, M. (eds) Structural Nonlinear Dynamics and Diagnosis. Springer Proceedings in Physics, vol 168. Springer, Cham. https://doi.org/10.1007/978-3-319-19851-4_19
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DOI: https://doi.org/10.1007/978-3-319-19851-4_19
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