某V型柴油机曲轴疲劳寿命仿真  

Simulation of Fatigue Life of a V Diesel Engine Crankshaft

作　　者：冯国胜 商海昆 胡春萍[2] 李鹏飞 

机构地区：[1]石家庄铁道大学机械工程学院,河北石家庄050043 [2]河北华北柴油机有限责任公司,河北石家庄050081

出　　处：《图学学报》2017年第6期820-825,共6页Journal of Graphics

基　　金：河北省工程机械动力与传动控制重点实验室项目(PTC1602)

摘　　要：为了对某V型柴油机将最大爆发压力由15.5 MPa提升至16.5 MPa后曲轴的强度及疲劳寿命进行预测,首先在ADAMS/Engine中根据发动机模型及参数建立了发动机动力学模型,获取曲柄销处的载荷时程数据,然后建立了最大爆发压力为15.5 MPa和16.5 MPa一缸点火及二缸点火共4个工况有限元模型,由各工况的应力结果结合材料的S-N曲线及载荷时程曲线,计算得到各工况曲轴的疲劳寿命。计算结果表明,曲轴在各工况下其最大应力小于材料弯曲疲劳极限,应力集中处主要出现在连杆轴颈过渡圆角处,各工况下曲轴寿命高于1 000小时。In order to make the life prediction of the crankshaft strength and fatigue life when the maximum explosion pressure of a V diesel engine change from 15.5 MPa to 16.5 MPa. First we establish the dynamics model of engine in the ADAMS/engine based on engine model and parameters, and obtain the load time history data of the crank pin point, then we establish four cylinder ignition conditions finite element model of the first cylinder and the second cylinder when the maximum explosion pressure change from 15.5 MPa to 16.5 MPa. Then we calculate and get the each working condition fatigue life of the crankshaft according to the stress of all working conditions, the material s-n curve and the load time history curve. Calculation results show that the crankshaft maximum stress is less than the material fatigue limit in various operating conditions, and the stress concentration place mainly happens in the transition fillet of the connecting rod and journal, and the crankshaft life is over 1 000 hours in various working conditions.

关 键 词：内燃机 曲轴 有限元法 强度 疲劳寿命 

分 类 号：TK413.3[动力工程及工程热物理—动力机械及工程]