一种异形支架结构的多目标优化设计方法  

Multi-Objective Optimization Design Method for a Irregular Bracket Structure

作　　者：冯凯 王军 林君哲[2] 韩清凯[2] FENG Kai;WANG Jun;LIN Jun-zhe;HAN Qing-kai(AECC Shenyang Engine Research Institute,Liaoning Shenyang 110015,China;School of Mechanical Engineering and Automation,Northeastern University,Liaoning Shenyang 110819,China)

机构地区：[1]中国航发沈阳发动机研究所,辽宁沈阳110015 [2]东北大学机械工程与自动化学院,辽宁沈阳110819

出　　处：《机械设计与制造》2024年第1期250-255,共6页Machinery Design & Manufacture

基　　金：国家自然科学基金面上项目(12072069);辽宁省医工交叉联合基金(2021-YGJC-10)。

摘　　要：以航空发动机润滑油箱在机匣上安装时所采用的成附件安装结构支架为典型代表,具有复杂结构形式的异形支架,要求具有相对较高的刚度和较轻的质量,为此,建立了综合正交试验方法、有限元分析方法和神经网络拟合方法相结合的一种结构动力学特性的优化设计方法,对于具有复杂结构形式的支架结构具有较高的优化设计效率。应用正交试验方法,在支架样件模型的设计变量的可行域内合理地选择零件的解集,使该解集能充分反映优化的目标变量与设计变量之间的关系;使用有限元参数化仿真方法,对选择出的样件模型进行参数化仿真计算,得到解集中每个样件模型对应的优化的目标变量值;基于神经网络拟合方法,基于参数化仿真得到的数据,构建出设计变量与优化目标变量之间的数学模型,并使用多目标优化算法NSGA-Ⅱ进行迭代求解,得到最终优化设计结果;优化样件与初始样件的固有频率相对变化率与仿真计算值基本一致,可以验证支架结构多目标优化设计方法的准确性和有效性。In aeroengine lubricating oil tank adopted when installed on the casing as the typical representative of stents,forms of special shape bracket with complex structure,with relatively high stiffness and light quality,therefore,this paper established a comprehensive orthogonal test method,the finite element analysis method,the neural network fitting method with the combina-tion of a structural dynamics optimization design method,It has high optimization design efficiency for the structure with com-plex structure.Using the orthogonal test method,the solution set of the components is reasonably selected in the feasible domain of the design variables of the scaffold sample model,so that the solution set can fully reflect the relationship between the optimized objective variables and the design variables.Using the finite element parameterized simulation method,the selected sample model was simulated by parameterized calculation,and the optimized target variable value of each sample model in the solution set was obtained.Based on the neural network fitting method and the data obtained from the parametric simulation,the mathematical model between the design variables and the optimization objective variables was constructed,and the multi-objective optimization algorithm NSGA-Ⅱwas used for iterative solution,and the final optimization design result was obtained.The relative change rate of natural frequencies of the optimized samples and the initial samples is basically consistent with the simulation value,which can verify the accuracy and effectiveness of the multi-objective optimization design method of the scaffold structure.

关 键 词：成附件安装结构 正交试验方法 多目标优化设计 有限元分析 

分 类 号：TH16[机械工程—机械制造及自动化] TH12