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基于Ｙａｍａｍｏｔｏ提出的一种新的进化策略，得到一种改进进化方向的遗传算法．该法用于桁架结构遗传设计，不仅能够提高收敛速度，而且提高桁架遗传设计精度，与梯度下降进化方向遗传算法相比，计算时间大大减少．
Based on a new evolution strategy proposed by Yamamoto, a genetic algorithm for improving evolutionary direction is obtained. This method is applied to the genetic design of truss structure, which can not only improve the convergence speed, but also improve the precision of truss genetic design. Compared with the genetic algorithm with gradient descend and evolutionary direction, the method can greatly reduce the computation time.