中文摘要：

针对目前液压缸结构设计中主要结构参数依据经验方法确定的不足，以公称压力为600kN、型号为YS41-60的新型单臂开式伺服驱动液压机为应用背景，建立法兰支承液压缸有限元分析模型。以液压缸重量最轻为优化目标，以缸筒外径2rz、缸底厚度t、缸底过渡圆弧半径R1、缸的法兰厚度h、缸法兰处过渡圆弧半径R及法兰部分的外径2r4这6个参数为设计变量，提出了合理的设计参数及应力的约束条件，采用改进遗传算法对油缸的结构参数进行优化，优化后液压缸的重量相对减少了41％，优化效果明显。进一步采用ANSYS软件对优化前后的油缸进行了有限元分析，数值模拟验证了优化结果的正确性。

英文摘要：

Aiming at the shortage of the conventional way determining the principal parameters in structural design of hydraulic cylinder, a finite element model of the hydraulic cylinder supported by a flange was built on a new-style servo open-type hydraulic press YS41-60 with nominal pressure 600 kN. Then using the lightest weight of hydraulic cylinder as the optimal objective and using outside diameter of the cylinder （2r2）, bottom thickness （t）, bottom transition radius （R1）, flange thinness （h）, flange transition radius （R） and outside diameter of the flange （2r4） as the design variables, the reasonable constraints of the design parameters and stress were proposed and the improved genetic algorithm was adopted to optimize the structural parameters of the cylinder. The results indicate that the weight of hydraulic cyl- inder is relatively reduced by 41%, and optimization effect is obvious. Finally, the finite element method was employed to analyze the optimal structure by ANSYS software, and the numerical simulations verified the validity of genetic algorithms.