OtimizaÃÃo multiobjetivo da confiabilidade via sistemas multiagentes baseado em colÃnia de formigas

AUTOR(ES)
DATA DE PUBLICAÇÃO

2008

RESUMO

This dissertation presents the modeling, implementation and results of a multiagent system based on ant colony metaheuristic to solve multiobjectve problems on reliability engineering area. We will consider redundancy allocation and periodic tests policy problems. High reliability and low associated costs are objectives of all systems projects. Meanwhile, in general, these are opposite objectives. So, find an optimal solution for both, is a impossible task. In fact, adopting a multiobjective approach we may find a group of optimal solutions that complains the system constraints. One way, between many others, to raise a system reliability is by redundancy allocation. But this increase will cause higher costs. So, the objective is to find the optimal equipment number for each subsystems, in way to satisfy the costs and reliability constraints. The way to get the periodic tests interval had been so much discussed on recent academic works. The search is for a high reliability level that is reached by applying a certain interval of tests but if the test frequency is so high, it will increase a lot the costs, and that could not compensate the reliability raise associated. In application examples, are consider both no repairable systems, that are no possibility to maintain, and repairable systems, that after a breakdown may return to normal operation by a procedure that is not a complete substitution. There are application examples for redundancy allocation problems and a periodic tests policy problem for security systems of a nuclear power plant

ASSUNTO(S)

sistema multiagente engenharia de producao engenharia de produÃÃo engenharia de confiabilidade

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