刚度和质量驱动的预紧组合框架式液压机多目标优化设计

Multi-objective Optimization Design of Heavy Forge Framed Hydraulic Press Driven by Stiffness and Mass

为了满足液压机高刚度、轻量化的性能要求,提出刚度和质量驱动的液压机多目标优化设计方法。通过对98MN数控等温锻造液压机结构分析,抽取影响液压机刚度和质量的关键因素;运用正交试验设计方法进行试验,提取刚度和强度与关键因素之间的关系数据。采用一阶响应面建模方法建立上横梁、下横梁刚度和主要部件强度的数学模型,并用统计误差分析方法验证模型的有效性。根据部件结构,建立液压机整机质量的数学模型。进而建立以提高刚度和减轻质量为目标的液压机优化模型。运用非支配解排序遗传优化算法,对液压机上梁刚度与整机质量进行多目标优化,得到Pareto优化解集,可使98MN数控等温锻造液压机刚度提高5%、质量减轻10%。

In order to satisfy the performance requirement of high stiffness and light weight of the NC isothermal hydraulic press, a design method of multi-objective optimization driven by stiffness and mass is proposed. Through analyzing the structure of 98 MN hydraulic press, key factors affecting the stiffness and mass are extracted. Data of relationship between stiffness / strength and key factors are obtained by orthogonal experiment in ABAQUS. The mathematical models of stiffness of upper beam and lower beam and strength of main components are constructed by use of first order response surface modeling method. Validity of these models is verified by analysis of variance. Mathematical models of mass of complete hydraulic press are established. The goal of high stiffness and light weight is reached by using the multi-objective genetic algorithms optimization method. The Pareto optimal solution set is obtained. Through optimization, the stiffness of 98 MN hydraulic press is increased by 5% and its mass is decreased by 10% in comparison to the original design.