摘要
针对某四缸发动机平衡轴壳体在发动机台架试验时出现断裂的问题,基于建立的平衡轴总成三维模型,对平衡轴总成进行了模态分析,得到了壳体1~6阶模态频率;以多体动力学分析得到的壳体受力作为边界条件,对平衡轴壳体进行了强度及疲劳分析,得到了壳体4种加载工况下的应力分布规律,应力值最大加载工况下壳体的疲劳寿命和安全系数;确定了壳体断裂原因为疲劳失效。基于非支配分类遗传算法的多目标优化方法,以疲劳寿命、安全系数和壳体质量为目标对壳体进行了多目标优化,改进了壳体结构,有效地提高了壳体的疲劳寿命和安全系数,解决了平衡轴壳体的断裂问题。
To solve the fracture problem of four-cylinder engine balance shaft shell during the engine bench test,the modal analysis of the balance shaft assembly based on the three-dimensional modal is carried out and the 1~6 order modal frequencies are obtained.The strength and fatigue analysis of the balance shaft shell based on the force obtained by multi-body dynamics simulation are carried out,the distribution of stress in four loading conditions and the fatigue life,safety coefficient of the shell in the maximum loading condition are acquired,and it is determined that the fracture of the shell is fatigue failure.At last,with the goal of fatigue life,safety coefficient and shell quality,a multi-objective optimization method based on non-dominated sorting genetic algorithm is adopted to optimize the shell structure.The shell structure is improved,the fatigue life and safety coefficient of the shell are increased effectively,and the fracture problem of the balance shaft shell is solved.
作者
祝慧敏
付景顺
乔赫廷
ZHU Hui-min;FU Jing-shun;QIAO He-ting(Shenyang University of Technology,Liaoning Shenyang 110870,China)
出处
《机械设计与制造》
北大核心
2022年第4期253-257,共5页
Machinery Design & Manufacture
基金
国家自然科学基金(51505298)
辽宁省自然科学基金计划重点项目(20170520143)。
关键词
壳体
断裂
模态分析
多体动力学分析
强度分析
疲劳分析
遗传算法
多目标优化
Shell
Fracture
Modal Analysis
Multi-Body Dynamics Simulation
Strength Analysis
Fatigue Analysis
Genetic Algorithm
Multi-Objective Optimization
