中文摘要：

针对传统发动机存在效率低和污染严重等问题,本文基于灵敏度分析,对GCHE连杆模型进行结构优化设计,以获得满足各项设计要求前提下的最小体积,并对所选取的设计变量进行灵敏度分析,以检验所选设计变量的合理性。首先基于Isight软件中的实验设计模块,按正交数组的实验设计方法对设计变量进行灵敏度分析,剔除对输出响应贡献率小于5%的设计变量;其次再基于Isight软件中的优化算法模块,采用梯度优化算法中的序列二次规划法对连杆进行结构优化,以获得最小体积。优化结果表明,按筛选后的设计变量进行优化设计,优化结果体积减小20.73%,优化效果明显,经分析验证满足设计要求,优化结果合理。基于灵敏度分析的GCHE连杆结构优化设计能得到设计变量对输出响应的贡献率,便于剔除贡献率较低的设计变量,简化优化过程,得到最佳优化结果。该研究具有重要的研究意义和应用前景。

英文摘要：

Aiming at the problems of low efficiency and serious pollution of traditional engine,based on the sensitivity analysis,this paper aims at optimizing the structural design of GCHE＇s connecting rod model to get the minimum volume under the design requirements.And testing the sensitivity of selected design variables to examine the rationality.First based on the model of DOE in Isight software,it analyzes the sensitivity of design variables in Orthogonal Arrays and eliminate variables whose contribution are less than 5% to the outcome.And then based on the model of Optimization in Isight software and the algorithm of Sequential Quadratic Programming（NLPQL）,it optimizes the structure of connecting rod in order to get the minimum volume.The optimization results show that according to the chosen variables to optimize,the volume of connecting rod decrease obviously by 20.73%,the outcome is reasonable and suitable for requirements.Optimal design of the GCHE＇s connecting rod based on sensitivity analysis can get the design variables＇ contribution to outcome.Consequently,we can eliminate the design variables with less contribution in order to simplify the optimization process and get the best results.The study has important significance and application prospect.