中文摘要：

一个优化方法为冷段形成钛合金飞机皮肤决定过程参数并且减少 springback 被介绍。在优化模型，压力差别的数学明确的表达作为 springback 的度的指示物被开发而不是含蓄的 springback 分析。明确的有限元素方法(女性) 被用来分析形成的过程并且为计算压力指示物的数量提供压力分发。另外，多岛基因算法(MGA ) 被采用寻求最佳的装载条件。案例研究被执行表明建议方法的潜力。结果证明进程参数的优化设计有效地减少 springback 的数量并且改进部分形状精确性。它为在段形成飞机皮肤控制 springback 提供一个指南。

英文摘要：

An optimization method was presented for cold stretch forming of titanium-alloy aircraft skin to determine process parameters and to reduce springback.In the optimization model,a mathematical formulation of stress difference was developed as an indicator of the degree of springback instead of implicit springback analysis.Explicit finite element method（FEM）was used to analyze the forming process and to provide the stress distribution for calculating the amount of the stress indicator.In addition,multi-island genetic algorithm（MGA）was employed to seek the optimal loading condition.A case study was performed to demonstrate the potential of the suggested method.The results show that the optimization design of process parameters effectively reduces the amount of springback and improves the part shape accuracy.It provides a guideline for controlling springback in stretch forming of aircraft skin.