Browsing by Author "Mota Soares, C.M."
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- Multiobjective optimization of viscoelastic laminated sandwich structures using the Direct MultiSearch methodPublication . Madeira, JFA; Araújo, A.L.; Mota Soares, C.M.; Mota Soares, C.A.A multiobjective approach for optimization of passive damping for vibration reduction in sandwich structures is presented in this paper. Constrained optimization is conducted for maximization of modal loss factors and minimization of weight of sandwich beams and plates with elastic laminated constraining layers and a viscoelastic core, with layer thickness and material and laminate layer ply orientation angles as design variables. The problem is solved using the Direct MultiSearch (DMS) solver for derivative-free multiobjective optimization and solutions are compared with alternative ones obtained using genetic algorithms.
- Optimal design for active damping in sandwich structures using the Direct MultiSearch methodPublication . Araújo, Aurélio L.; Madeira, JFA; Mota Soares, C.M.; Mota Soares, Carlos AlbertoThis paper addresses the problem of optimal positioning of surface bonded piezoelectric patches in sandwich plates with viscoelastic core and laminated face layers. The objective is to maximize a set of modal loss factors for a given frequency range using multiobjective topology optimization. Active damping is introduced through co-located negative velocity feedback control. The multiobjective topology optimization problem is solved using the Direct MultiSearch Method. An application to a simply supported sandwich plate is presented with results for the maximization of the first six modal loss factors. The influence of the finite element mesh is analyzed and the results are, to some extent, compared with those obtained using alternative single objective optimization.