基于遗传算法的液压自伺服摆动缸结构优化与动态特性分析

Structure Optimization and Dynamic Characteristics Analysis of Hydraulic Self-servo Swing Cylinder Based on Genetic Algorithm

根据液压系统固有频率公式对液压自伺服摆动缸进行动态特性分析,通过分析影响其动态特性的四个参数得出,在一定条件下,欲提高液压自伺服摆动缸的动态特性,必须对其进行结构优化以便获得尽可能大的工作腔每弧度排量。在此基础上,提出了一种利用遗传算法对液压自伺服摆动缸结构进行优化的方法。为提高液压自伺服摆动缸的动态特性,建立了其三大状态方程及Simulink模型,分析了液压自伺服摆动缸系统固有频率式中4个参数对其动态特性的影响,并利用遗传算法获得了其结构参数最优解,将最优解与初始值分别代入Simulink模型进行仿真,仿真结果表明:利用液压自伺服摆动缸系统固有频率公式来研究其动态响应特性是正确可行的,该系统固有频率公式也可以应用于其他液压系统动态响应特性分析;利用遗传算法对液压自伺服摆动缸进行结构参数优化,与优化之前相比,优化之后系统整体的动态响应速度有了明显的提升。

The dynamic characteristics of hydraulic self-servo swing cylinder according to the natural frequency formula of hydraulic system were analyzed. It was concluded that its structure had to be optimized so as to obtain as larger the displacement per radian in working chamber as possible under certain conditions with the purpose of improve the dynamic characteristics of hydraulic self-servo swing cylinder by analyzing the four parameters that affected the dynamic characteristics. Based on that,a structure optimization method of the hydraulic self-servo swing cylinder by using genetic algorithm was proposed. In order to improve the dynamic characteristics of hydraulic self-servo swing cylinder,three equations of state and Simulink model were established,the effect of the four parameters in natural frequency equation of hydraulic self-servo swing cylinder on its dynamic characteristics was analyzed,and the optimal solution and initial value were substituted separately to the Simulink model and analyzed. Simulation results show that: it is right and feasible to study its dynamic response characteristics by using the natural frequency formula of cylinder system,and the system natural frequency formula can also be applied to analyze the dynamic response characteristics of other hydraulic system. As compared with no optimization,the overall system dynamic response speed is significantly improved after using genetic algorithm to optimize the structure parameters of hydraulic self-servo swing cylinder.