考虑冲压成形工艺的耐撞性分析及稳健性优化设计

发布时间：2018-01-01 10:04

本文关键词：考虑冲压成形工艺的耐撞性分析及稳健性优化设计　出处：《湖南大学》2015年硕士论文　论文类型：学位论文

【摘要】：冲压成形工艺所引起的冲压效应和几何效应对碰撞仿真精度有着重要的影响。为了提高碰撞仿真精度,论文分析了冲压效应和几何效应分别对碰撞结果的影响,并构建一种考虑冲压成形工艺的碰撞问题多目标稳健性优化设计方法。论文的主要研究内容如下:以帽型梁为研究对象,分析圆角大小和不同拉延系数下的回弹变形对碰撞的影响,结果表明,圆角大小和回弹变形都对碰撞吸能和峰值碰撞力有影响。将冲压效应引入到碰撞分析模型中,分析对比考虑冲压效应、只考虑等效塑性应变、只考虑厚度信息和理想模型四种碰撞分析情况。结果表明,厚度减薄会导致峰值碰撞力和吸能减小,等效塑性应变正好相反,考虑冲压效应可以提高碰撞仿真的精度。以零件的峰值碰撞力和吸能为评价指标,采取正交试验设计方法,筛选出弹性模量、屈服极限和冲压仿真速度三个对碰撞分析影响大的噪声因素。优化设计变量选取冲压工艺参数和帽型梁截面尺寸参数。以帽型梁成形质量和耐撞性能为目标,将田口设计方法、拉丁方试验设计方法和Kriging模型相结合,构造基于Dual-Kriging多目标稳健性优化模型,采用多目标遗传算法对该模型进行优化求解,并获得非劣最优解集。根据实际设计要求选择一组合适的设计变量作为最优结果。结果表明,帽型梁碰撞性能和冲压成形质量的稳健性得到了的提高。本文在碰撞稳健性优化模型中考虑冲压成形工艺因素的影响,有效的提高了碰撞仿真分析的精度,对碰撞稳健性优化具有较好的理论指导意义,为工程设计分析提供了一定的参考。
[Abstract]:The stamping effect and geometric effect caused by stamping process have an important influence on the impact simulation accuracy. In order to improve the impact simulation accuracy, the impact of stamping effect and geometric effect on the impact results are analyzed in this paper. A multi-objective robust optimal design method considering stamping process is constructed. The main contents of this paper are as follows: the cap beam is taken as the research object. The effect of springback deformation on collision under different drawing coefficients and angle size is analyzed, and the results show that. The impact energy absorption and peak impact force are affected by the angle size and springback deformation. The punching effect is introduced into the collision analysis model, and the punching effect is considered comparatively, and only the equivalent plastic strain is considered. Considering only the thickness information and the four kinds of impact analysis of ideal model, the results show that thickness thinning will lead to the decrease of peak collision force and energy absorption, and the equivalent plastic strain is just the opposite. Considering the stamping effect, the accuracy of impact simulation can be improved. Taking the peak impact force and energy absorption of the part as the evaluation index, the elastic modulus is screened by orthogonal test design method. The yield limit and stamping simulation speed have great influence on the impact analysis. The parameters of stamping process and section size of cap beam are selected as the optimum design variables. The forming quality and crashworthiness of cap beam are taken as the target. Taguchi design method, Latin square test design method and Kriging model are combined to construct a multi-objective robust optimization model based on Dual-Kriging. The multi-objective genetic algorithm is used to optimize the model, and the set of non-inferior optimal solutions is obtained. According to the actual design requirements, a set of suitable design variables are selected as the optimal results. The impact performance of cap beam and the robustness of stamping quality have been improved. In this paper, the impact robustness optimization model takes into account the impact of stamping process factors, which effectively improves the accuracy of impact simulation analysis. It has good theoretical significance for collision robustness optimization and provides a certain reference for engineering design analysis.
【学位授予单位】：湖南大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TG386

【参考文献】