基于分层优化策略的柴油机连杆优化设计  

Optimized Design of Diesel Engine Connecting Rod Based on Hierarchical Optimization Strategy

作　　者：平思亮 王兴 白羽 PING Siliang;WANG Xing;BAI Yu(Department of Electromechanical and Vehicle Engineering,Taiyuan University,Taiyuan 030032,China;College of Transportation,Inner Mongolia University,Huhhot 010021,China)

机构地区：[1]太原学院机电与车辆工程系,山西太原030032 [2]内蒙古大学交通学院,内蒙古呼和浩特010021

出　　处：《汽车实用技术》2024年第18期43-49,共7页Automobile Applied Technology

基　　金：山西省教育厅教改项目(J20231430)。

摘　　要：由于柴油机连杆在高速运动过程中受力复杂,因此连杆优化一直面临着单目标、多约束、多参数的优化问题,导致计算复杂、不易收敛。文中基于有限元法和结构优化理论,建立了某柴油机连杆的仿真模型,分别采用分层优化方法和直接优化方法对该连杆进行了优化设计。研究结果表明,相比于传统直接优化方法,分层优化方法每层目标函数收敛性较好,计算效率提高48%,优化后连杆减重11.74%,最大应力下降13.6%、最大变形降低9%。研究为发动机连杆设计及优化提出了新的思路,可为复杂机械结构优化设计提供借鉴。Because the diesel engine connecting rod is subjected to complex forces during high-speed movement,the optimization of the connecting rod has been facing a single-objective,multi-constraint and multi-parameter optimization problem,which leads to complex calculations and is not easy to converge.Based on the finite element method and structural optimization theory,the simulation model of a diesel engine connecting rod is established in the paper,and the connecting rod is optimized by using the hierarchical optimization method and direct optimization method respectively.The results show that compared with the traditional direct optimization method,the hierarchical optimization method is better convergence of the objective function of each layer,48%improvement of the computational efficiency,11.74%weight reduction of the connecting rod after optimization,13.6%decrease of the maximum stress,and 9%decrease of the maximum deformation.The study puts forward a new idea for the design and optimization of engine connecting rods,which can provide a useful reference for the optimization design of complex mechanical structures.

关 键 词：柴油机连杆 分层优化 有限元分析 参数化建模 

分 类 号：TH122[机械工程—机械设计及理论]