基于AFSA-GA串行算法的桥式起重机主梁轻量化设计

Lightweight design of main beam for bridge crane based on AFSA-GA serial algorithm

针对传统设计中因采用理论与经验相结合的方法而导致的桥式起重机主梁设计周期长、截面尺寸大、材料利用率低及设计成本与制造成本高等问题,提出以优势互补为理念的串行算法,即采用2种算法循环执行多次,直到满足输出要求。充分利用遗传算法(genetic algorithm,GA)全局快速收敛,人工鱼群算法(artificial fish swarm algorithm,AFSA)在小变量范围中求解精度较高、稳定性好等优势,通过在AFSA中增加缩小变量范围模块来构建AFSA-GA串行算法。选用3种类型测试函数对AFSA-GA进行可行性验证,并将AFSA-GA应用于50 t/22.5 m的桥式起重机主梁轻量化设计,以验证该串行算法的实用性。结果表明AFSA-GA在求解精度、收敛速度、鲁棒性方面满足工程实际要求,且具有适用性。工程实证表明AFSA-GA串行算法可应用于桥式起重机主梁轻量化设计,可达到缩短设计周期、减小截面尺寸及提高材料利用率的目的。

The main beam of bridge crane often adopts the method of combining theory and experience in traditional design,which results in the problems of long design period,large section size of main beam and low utilization rate of materials,and also causes the problem of high design cost and manufacturing cost of bridge crane.In view of the above problems,a serial the algorithm based on the concept of complementary advantages is put forward,which uses two algorithms to recycle multiple times,until the output meets the requirements.By making full use of advantages of the global fast convergence of genetic algorithm (GA) and the high solving precision and good stability of artificial fish swarm algorithm (AFSA) in the small variable range,the AFSA-GA serial algorithm was built by adding a module to narrow the scope of variables in AFSA.Three types of test functions were used to verify the feasibility of AFSA-GA,and the AFSA-GA was applied to the lightweight design of main beam for 50 t/22.5 m bridge crane to verify the practicability of the serial algorithm.The results showed that the AFSA-GA serial algorithm satisfied the practical requirements in terms of solving precision, convergence speed and robustness and had applicability.The engineering verification proves that the AFSA-GA serial algorithm can be applied to the lightweight design of the main beam for bridge crane, which can shorten the design period,reduce the section size and improve the material utilization rate.