基于模拟退火算法的五缸往复泵曲柄相位布置方案优化

Simulated annealing algorithm-based optimization of crank phase arrangement of quintuple-cylinder reciprocating pump

为改善往复泵曲轴受力,提高其工作性能,通过对往复泵曲轴受力及强度分析,以曲轴曲柄5个不同初始相位角为设计变量,以曲轴危险截面所受最大弯矩最小为优化目标,建立往复泵曲柄相位布置方案优化模型.基于模拟退火算法对往复泵曲轴的曲柄相位布置方案进行优化,最终得到2种曲柄相位优化布置,并对优化后的曲轴进行受力及强度仿真分析.结果表明:优化后的曲柄相位布置方案使得曲轴所受最大弯矩及弯扭组合应力最小,最优布置方案与最差布置方案相比,有效改善了曲轴受力;曲柄相位布置方案优化模型的建立方法同样适用于多缸(五缸、七缸及九缸)单/双作用往复泵,具有通用性;模拟退火算法可以快速优化曲柄相位布置方案,该算法可求得整体最优解,可靠性高,为类似曲轴的曲柄相位布置方案优化提供了新方法.

In order to improve the force distribution on the crankshaft of reciprocating pump and enhance the crankshaft performance,an optimization model of the crank phase arrangement of a reciprocating pump was established based on an analysis of the force and strength of the pump crankshaft.In the model,five initial phase angles of the crank were used as design variables and the maximum bending moment of the critical sections of the crankshaft was the objective function to be minimized.Based on the simulated annealing algorithm,the crank phase arrangement was optimized and two arrangements were obtained.Furthermore,the stress and strength simulation analysis were carried out for the optimized crankshaft.The results show that the optimized crank phase arrangement allows the crankshaft to have the smallest maximum bending moment and the lowest combined bending and torsion stress.Compared with the worst arrangement,the optimal arrangement has effectively alleviated the stress of crankshaft.The method for establishing optimization model of crank phase arrangement herein is universal and applicable to the crankshaft with even more liquid cylinders(five,seven and nine cy-linders)in single or double action reciprocating pumps.The simulated annealing algorithm can optimize crank phase arrangements quickly,but also can obtain the global optimal solution and subjects to a high reliability.It provides a new approach for crank phase arrangement optimization of similar crankshafts.