Research on multi-level optimization strategy for the lightweight design of grid-stiffened structures
For the problems of high computational cost and low solving efficiency faced by traditional direct optimization strategy for the lightweight design of grid-stiffened structures in engineering,three multi-level optimization strategies are proposed based on different design variable classification methods,namely two-level optimization strategy,three-level optimization strategy and four-level optimization strategy.Through the examples of direct optimization strategy and three multi-level optimization strategies,four optimization strategies are compared from aspects of optimization effect,rate of convergence and required iterations.The results show that in the lightweight design problem of grid-stiffened structures,the multi-level optimization strategies are more efficient than the direct optimization strategy;and in this example,considering the optimization effect,rate of convergence and the required number of iterations,the two-level optimization strategy classified by size class and shape class parameters has higher practicability.
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