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弹流润滑条件下柴油机曲轴的非线性损伤评估

Shenggang GUO,Xinwei TIAN,Junhong ZHANG

Internal Combustion Engine & PowerPlant（2018）

Cited 1|Views4
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Abstract
建立曲轴-轴承系统的动力学模型,考虑非线性弹簧和弹流润滑2种轴承支撑模型,分析典型工况下的曲轴应力分布;提取疲劳危险点应力时间历程,分析应力变化与曲轴振动的关系,并利用非线性损伤模型进行曲轴寿命预测.结果表明:油膜压力对曲轴整体应力分布规律影响不大,但对局部应力峰值有明显影响;第7主轴颈圆角是曲轴的疲劳危险点,该点载荷主要受曲轴扭振的影响,将扭矩引入损伤模型,进行曲轴寿命校核.
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