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某V 型柴油机曲轴疲劳寿命仿真

  

  1. 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
  • 出版日期:2017-12-30 发布日期:2018-01-11
  • 基金资助:
    河北省工程机械动力与传动控制重点实验室项目(PTC1602)

Simulation of Fatigue Life of a V Diesel Engine Crankshaft

  1. 1. College of Mechanical Engineering, Shijiazhuang Tiedao University, Shijiazhuang Hebei 050043, China;
    2. Hebei Huabei Diesel Engine Co., Ltd, Shijiazhuang Hebei 050081, China
  • Online:2017-12-30 Published:2018-01-11

PDF (PC)

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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。

关键词: 内燃机, 曲轴, 有限元法, 强度, 疲劳寿命

Abstract: 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.

Key words: internal combustion engine, crankshaft, finite element method, strength, fatigue life