变密度法在车身焊点布置拓扑优化中的应用

发布时间：2018-04-13 00:37

本文选题：车身 + 焊点布置　；参考：《机械科学与技术》2016年03期

【摘要】：为探索焊点布置对乘用车车身振动特性的影响,将变密度拓扑优化法应用于车身焊点布置的设计中,改善乘用车车身共振问题。首先,确定影响车身低阶模态频率的关键部件,然后将车身结构进行分区,最后应用变密度法对车身关键部件的焊点进行分区拓扑优化。结合乘用车车身焊接工艺,以车身低频固有振动特性为优化目标,以车身焊点体积最少为约束条件,以焊点单元密度为设计变量,对车身结构焊点布置进行拓扑优化。经模态分析,结果表明拓扑优化后车身焊点数目缩减了2.38%,车身的一阶模态频率为27.53 Hz,提高了1.28 Hz。将变密度法应用于乘用车车身焊点布置拓扑优化设计,有助于确定车身焊点的最佳布局,减少结构共振的可能性。
[Abstract]:In order to explore the effect of solder joint arrangement on the vibration characteristics of passenger car body, the variable density topology optimization method is applied to the design of body solder joint layout to improve the resonance problem of passenger car body.Firstly, the key components affecting the low-order modal frequency of the body are determined, then the body structure is partitioned. Finally, the zone topology of the solder joint of the key parts of the body is optimized by using the variable density method.Combined with the welding process of passenger car body, taking the inherent vibration characteristics of vehicle body at low frequency as the optimization objective, taking the minimum volume of the body solder joint as the constraint condition and the density of the solder joint unit as the design variable, the topology optimization of the body structure solder joint arrangement is carried out.The results of modal analysis show that the number of solder joints is reduced by 2.38 after topology optimization, and the first-order modal frequency of the body is 27.53 Hz, which is increased by 1.28 Hz.The application of variable density method to the topology optimization design of passenger car body solder joint arrangement is helpful to determine the optimal layout of body solder joint and reduce the possibility of structural resonance.
【作者单位】：南昌大学机电工程学院;清华大学汽车安全与节能国家重点实验室;奇瑞汽车股份有限公司汽车工程研究院;
【基金】：江西省教育厅青年科学基金项目(GJJ11034) 江西省自然科学基金项目(20142BAB216028)资助
【分类号】：U463.82

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