内燃机曲柄连杆机构冲击动力学分析
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摘要
基于多体动力学和有限元方法,以柴油机曲柄连杆机构为研究对象,综合考虑机构内部复杂的接触关系、主轴承油膜刚度、轴承间隙以及非线性因素,分别在柴油机额定工况和静止工况下,基于BV043/1985标准对机构进行抗冲击性能评估。结果表明:机构符合BV043/1985标准关于冲击安全级A级设备的相关要求,且在额定工况下的冲击响应高于静止工况;曲轴的冲击响应高于连杆。因此,需重点考虑:主轴承油膜刚度和轴承间隙对机构的冲击性能有较大影响,进行冲击动力学分析时不可忽略。
Based on multi-body system dynamics and FEM,considering complicated contact relationships,oil membrane stiffness of main bearings,bearing gap and some other non-linear factors,the shock response characteristics of the crank and connecting rod mechanism in a diesel engine was analyzed.Its shock-resistance performance was predicted and evaluated under rated condition and static condition respectively on the basis of BV043/1985 standard.The results indicate that the crank and connecting rod mechanism can meet BV043/1985 standard on impact security level of A-grade equipments,and the shock response stress of the mechanism under rated condition was greater than that under static condition,and the shock response stress of the crank was greater than that of the connecting rod.The oil membrane stiffness of main bearings and the bearing gap have a great influence on the shock response stress of the crank and connecting rod.
Based on multi-body system dynamics and FEM,considering complicated contact relationships,oil membrane stiffness of main bearings,bearing gap and some other non-linear factors,the shock response characteristics of the crank and connecting rod mechanism in a diesel engine was analyzed.Its shock-resistance performance was predicted and evaluated under rated condition and static condition respectively on the basis of BV043/1985 standard.The results indicate that the crank and connecting rod mechanism can meet BV043/1985 standard on impact security level of A-grade equipments,and the shock response stress of the mechanism under rated condition was greater than that under static condition,and the shock response stress of the crank was greater than that of the connecting rod.The oil membrane stiffness of main bearings and the bearing gap have a great influence on the shock response stress of the crank and connecting rod.
引文
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[2]林道福,佘永丰,华宏星.带限位器的浮筏隔振系统的冲击响应分析[J].噪声振动控制,2004,24(1):6-9.
[3]汪玉,赵建华,杜俭业,等.基于多体动力学有限元计算的一种舰用柴油机抗冲击性能仿真[J].振动与冲击,2009,28(1):87-90.
[4]计晨,汪玉,杨莉.柴油机主要部件冲击响应时域分析[J].兵工学报,2011,32(4):391-396.
[5]刘少俊,包国治,陈华清,等.12VPA6舰用柴油机曲柄连杆机构冲击响应分析[J].内燃机工程,2007,28(1):39-42.
[6]王杰贤.动力地基与基础[M].北京:科学出版社,2001.
[7]星谷胜(日),常宝琦译.随机振动分析[M].北京:地震出版社,1979.
[8]Lysner J,Kulemeyer R L.Finite dynamic model forinfinitemedia[J].Journal of Engineering Mechanics,ASCE,1969,95:759-877.
[9]汪玉,华宏星.舰艇现代冲击理论及应用[M].北京:科学出版社,2005.
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