劣性遺伝子的補修法を用いたGAによる積層円筒座屈強度最大化の設計信頼性向上

概要

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Genetic algorithms are applied to obtain the optimal stacking sequences for maximizations of buckling load of composite cylinders. In this problem, three rules for empirical stacking are implemented as constraints. The first is that the laminates have to be balanced. The second is that more than 4 contiguous plies of the same orientation is not allowed. The third is that difference of fiber orientations between adjacent plies must not exceed 45 degree. The difficulty of handling constraints in genetic optimizations are handled by adoption of a new repair system. The new repair system operates when the chromosome violating the constraints is decoded to a stacking sequence. This repair system does not alter genes of the chromosome but changes decoding rules to introduce the constraints. This is similar to recessive genes in biology. By using this repair system, a chromosome of {2 2 2 1 1 1 0 0 0} is decoded to [90/90/90/45/90/-45/-45/0/45] s. Design reliability of the genetic algorithm with the new repair system are examined in detail by comparing the reliability with a penalty method. As a result, the genetic algorithm with the repair system is shown to provide higher design reliability.
1999-03-25