In many practical engineering design problems, the form of objective function is not given explicitly in terms of design variables. Given the value of design variables, under this circumstance, the value of objective function is obtained by some analysis such as structural analysis, fluidmechanic analysis, thermodynamic analysis, and so on. Usually, these analyses are considerably time consuming to obtain a value of objective function.
In order to make the number of analyses as few as possible, approximate optimization methods using computational intelligence have been developed. In those methods, optimization is performed in parallel with predicting the form of objective function. In this paper, radial basis function networks (RBFN) are employed in predicting the form of objective function, and genetic algorithms (GA) in searching the optimal value of the predicted objective function. One of the most important tasks in this approach is to allocate sample data moderately in order to make the number of experiments as small as possible. The effectiveness of the suggested method will be shown through some numerical examples along with an application to seismic design in reinforcement of cable-stayed bridges.
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