| 变工况下的发动机连杆动态应力与疲劳损伤分析 |
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| 引用本文： | 骆清国,王旭东,张更云,杨良平,冉光政.变工况下的发动机连杆动态应力与疲劳损伤分析[J].车用发动机,2012(4):53-57. |
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| 作者姓名： | 骆清国 王旭东 张更云 杨良平 冉光政 |
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| 作者单位： | 装甲兵工程学院机械工程系 |
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| 基金项目： | 军队科研计划项目(2010ZB13) |
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| 摘 要： | 以发动机曲柄连杆机构为研究对象,基于柔性多体动力学理论,建立了活塞、连杆、曲轴和飞轮的刚柔耦合动力学模型,分别计算了发动机稳态工况与变工况下的连杆应力,并对连杆危险节点的应力时间历程进行了雨流计数和疲劳损伤计算。结果表明,发动机在变工况运行时,连杆危险节点应力变化幅值相对稳态工况增大,加速了连杆的疲劳破坏。
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| 关 键 词： | 变工况 连杆 耦合 动态应力 疲劳损伤 |
Dynamic Stress and Fatigue Damage Analysis of Engine Connecting Rod under Variable Conditions |
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| LUO Qing-guo,WANG Xu-dong,ZHANG Geng-yun, YANG Liang-ping,RAN Guang-zheng.Dynamic Stress and Fatigue Damage Analysis of Engine Connecting Rod under Variable Conditions[J].Vehicle Engine,2012(4):53-57. |
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| Authors: | LUO Qing-guo WANG Xu-dong ZHANG Geng-yun YANG Liang-ping RAN Guang-zheng |
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| Institution: | (Department of Mechanical Engineering,Academy of Armored Force Engineering,Beijing 100072,China) |
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| Abstract: | Based on the flexible multibody dynamics theory,the rigid-flexible coupling model of piston,connecting rod,crankshaft and flywheel was built for the crank arm and connecting rod mechanism.The stresses of connecting rod were calculated under steady and variable operating conditions and were analyzed by the rain-flow count and the fatigue damage calculation in dangerous node of connecting rod.The results indicate that the stress amplitude of dangerous node for connecting rod under variable conditions is larger than that of steady conditions,which speeds up the fatigue damage of connecting rod. |
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| Keywords: | variable conditions connecting rod coupling dynamic stress fatigue damage |
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