桥式起重机箱型主梁的改进遗传算法优化设计

在遗传算法原理的基础上,首先对遗传算法中的选择算子进行改进优化,将优胜劣汰的思想融入到遗传算法中,从而保障最优基因能迅速地遗传到后代,加速收敛。然后通过时刻改变惩罚项和障碍项动态调整适应度函数,避免算法止于局部最优。最后,将改进的遗传算法应用于桥式起重机箱形主梁的优化设计中。

Optimized Design for Box Girder of Bridge Crane Based on Improved Genetic Algorithms

Based on the principle of genetic algorithms, this paper first improves and optimizes the selection operator of genetic algorithm, bringing the principles of “survival of the fittest” into the frame of the genetic algorithms, thus faster transmission of the elitist genes into the later generations and the increase of the convergence speed is guaranteed; and then the dynamic change of fitness function is realized through the dynamic changes of barrier items and penalty items, so as to achieve the global convergence of the algorithm. Finally, the improved genetic algorithm is applied to the optimized design of the box girder of bridge crane.