曲轴轴系的结构强度分析与疲劳寿命估算_朱永梅.docxVIP

Journal of Mechanical Strength2010, 32( 6) : 1018- 1021p 研究简报 p曲轴轴系的结构强度分析与疲劳寿命估算XANALYSIS OF STRUCTURAL STRENGTH AND PREDICTION OF FATIGUE LIFE FOR CRANKSHAFT AND LINK MECHANISM朱永梅XX王明强刘艳梨( 江苏科技大学 机械工程学院, 江苏 镇江 212003)ZHU YongMeiWANG MingQiangLIU YanLi( School of Mechanical Engineering , Jiangsu University of Science and Technology , Zhenjiang Jiangsu 212003, China)摘要 将多柔体动力学方法引入到曲轴计算中, 建立发动机曲轴轴系的动力学仿真模型, 对曲轴轴 系进行刚柔耦 合 多体运动学和动力学仿真, 为下一步疲劳寿命计 算提供可靠的载荷条 件; 然 后, 从曲 轴所受的 载荷中找 出三个 载荷比 较 大的 时刻, 计算得到其相应时刻的应力和应变分布规律, 找出曲轴受力的危险部位, 为曲轴的动态强度分析提 供数据; 最 后, 结合 Ansys 有限元分析软件和柯顿- 多兰( Certon- Dolan) 理论, 估算 连杆疲 劳寿命, 同 时分析多 级载荷 加载次 序对疲 劳 寿命的影响, 为零部件的主动寿命设计提供参考 数据和理论判据。关键词 强度 疲劳寿命 动力学 曲轴轴系 中图分类号 TH123. 3AbstractIntroducing mult-i flexib1e body dynamics to crankshaft computing, a dynamics simulation model of crank and link mechanism of an engine is built. Based on the rigid and flex coupled model, ADAMS( automatic dynamic analysis of mechanical sys- tems) is used to do a kinematics and dynamic simulation to get dynamic loads. It also provides a reliable characteristic for the body v-i bration noise of next step. Then the bigger loads of three moments are identified from all loads. The distribution law of the stress and strain of corresponding moment are achieved and its dangerous parts are found to offer date of dynamic strength analysis. At last, com- bining the Ansys and the theory of Certon-Dolan, the fatigue life of the link is calculated and the affection of loading order of multilevel loads to fatigue life is analyzed in detail, which have provided the referenced data and the theory of criterion for reliability design.Key words Strength; Fatigue life; Dynamics; Crankshaft and link mechanismCorresponding author : ZH U YongMei , E-mail : zymtt @ 163. com, Tel : + 86- 511- Fax : + 86-511-The project supported by the Shipbuilding Industry Defense Technology Pre- research Foundation of China ( No . 07J2. 3. 2) . Manuscript re