基于Isight的液压机下横梁筋板布置位置优化设计

Optimization Design of Connecting Location of Stiffener for Hydraulic Press’s Beam Based on Isight

液压机下横梁是关系到整机几何刚度和制品成型精度的重要零件。为了获得材料最优布置的箱梁结构形式,对横向筋板厚度不同情况下的筋板布置位置进行优化,利用有限元分析与灵敏度分析获得参数化模型,结合最优拉丁超立方设计建立基于径向基神经网络的近似优化模型,用序列二次规划法(NLPQL)求解。结果表明,横向筋板厚度对梁的刚度性能影响最大,当厚度从小到大变化时,筋板的最优位置布置由中间相对集中方式逐渐往均匀分布方式变化。不同厚度的横向筋板对应有着不同的最优布置方式。在保持原刚度不下降的前提下,可将质量减小约12%。

The base cross beam of the hydraulic press has a dominant effect on the stiffness of the frame rigidity and the forming precision of products. To obtain the optimal layout of the beam structure, the connecting location of stiffener is optimized under the different thickness of transverse stiffener. Its parametric model is built by using the finite element method and sensitivity analysis. The approximate model based on RBF is established by using the Opt LHD method, then, this model for optimization is solved by NLPQL algorithm. The results show that the thickness of the transverse stiffener has great influence on the stiffness of the beam. With its thickness change, the optimal location changes from the relative concentration in the middle to a uniform distribution. In the new design schemes, the mass of beam can be dropped down to 12%, its original stiffness is not changed.