An efficient hybrid algorithm for the optimization of problems with several local minima

The problem of design optimization is of high industrial interest, and has been extensively studied for years, with excellent results. However, there is the well-known issue of a reasonable balance between the compu- tational e ort usually required by stochastic methods, and the fact that deterministic optimizers, even though much more e cient, are not guaranteed to localize a good minimum, as they can remain trapped in the rst found local one. To overcome these problems, the authors developed a hybrid strategy, which gave good results in terms of speed and reliability of the obtained optima, especially when the objective function is obtained through a nite element analysis, due, for example, to the absence of an analytical solution of the problem, and the direct use of a stochastic method would be unfeasible for practical purposes, because of the intolerable processing time required