
A FEM/BEM based topology optimization of submerged bi-material shell structures under harmonic excitations
A topology optimization approach is proposed for the optimal design of bi-material distribution on underwater shell structures. The coupled finite element method (FEM) / boundary element method (BEM) scheme is used for the system response analysis, where the strong interaction between
the structural and the acoustic domain is considered. The design variables are the artificial densities of design material elements in a bi-material model constructed by the solid isotropic material with penalization (SIMP) method, and the minimization of sound power level (SWL) is chosen
to be the design objective. In this study, the adjoint operator method is employed to calculate the sensitivity of the objective function with respect to the design variables. Based on the sensitivity information, the gradient-based optimization solver is finally applied for updating the design
variables during the optimization process. Numerical tests are provided to illustrate the the validity of the proposed optimization procedure. Results show that the heavy fluid feedback has a big impact on the final design, and thus it is necessary to conduct a strong coupling scheme between
the fluid and structures.
Keywords: SIMP; boundary element method; finite element method; topology optimization
Document Type: Research Article
Publication date: 01 December 2018
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