PG-EAM - Programa de Pós-Graduação em Engenharia Aeronáutica e Mecânica
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Dissertação de Mestrado 2013

Minimax approach applied to topology optimization of structures subjected to multiple load cases

Autor

Rafael Santos Iwamura

Orientador

Área de Concentração

Mecânica dos Sólidos e Estruturas

Data de Defesa

25/11/2013

Número da Tese

65669

Resumo

This work investigates a topology optimization strategy for structures under multiple load cases. Typically compliance is calculated for each of the load cases in analysis and minimization is computed for a weighted average of the compliances, resulting in time consuming algorithms. A way to increase convergence speed is updating density on the element level. Instead of having an averaged compliance for the whole structure, it is proposed to compute it individually for every element. All load cases are analyzed, however only the ones of the maximum compliances are considered for sensitivity analysis. Thus compliance gradient is function of a few load cases at each element, reducing the processing time without significant weight penalty. The efficiency of the proposed technique is exemplified and compared to the one of a classical approach of multiple load case problem, solved using optimality criteria.

Palavras-chave

Topologia Otimização Estruturas Matemática Engenharia estrutural