基于UG/NX Nastran的发动机连杆三维设计及优化

Three dimensional design and optimization of engine connecting rod based on UG/NX Nastran

连杆是发动机传递动力的重要零件,为了减小其所受惯性力的影响,在保证连杆强度的前提下,对连杆进行轻量化设计非常重要。采用UG软件建立连杆实体模型,应用NX Nastran对连杆两个极限工况进行静力分析。以连杆质量最轻为优化目标进行优化设计,为便于工程实际,对优化后的参数进行了圆整修正和校验,并对优化后的连杆进行线性屈曲稳定性分析。结果表明,优化后的连杆模型质量减轻,最大应力仍符合强度要求,并且稳定性也符合要求。

The connecting rod is an important part of engine to transmit power.In order to reduce the influence of inertia force,it is very important to design lightweight connecting rod on the premise of guaranteeing its strength.The solid model of the connecting rod is established by UG software,and the static analysis of the two extreme working conditions is carried out by NX Nastran.The optimum design is carried out with the lightest weight of the connecting rod as the optimization objective.In order to facilitate the actual situation of the engineering,the optimized parameters are rounded off and calibrated,followed by the linear buckling stability analysis on the optimized connecting rod.The results show that the optimized connecting rod model is lightened while the maximum strength and stability still meet the requirement.