摘要
基于多体动力学有关理论,计入影响滑动轴承弹流动压润滑的有关因素,构建连杆轴承仿真计算模型,采用有限元法对二冲程船用柴油机额定工况下的连杆大端和小端轴承的润滑状况进行研究。根据在一个工作循环内的计算结果可以发现:小端轴承即十字头轴承始终承受压应力,而大端轴承短时间内存在拉应力,垂向载荷方向改变;载荷的最大值皆发生在缸内气体压力最大的时刻;小端轴承高油压区域十分集中,其轴心运动轨迹存在于下半部较小的范围内;大端轴承轴心轨迹主要存在于上半部的右半部分; 2个轴承的平均油膜压力分布皆较为集中;连杆两轴承的油膜最小厚度皆大于3μm,能满足流体动压润滑的要求。
Based on the theory of multi-body dynamics,by considering the factors affecting the elasto-hydrodynamic lubrication of journal bearing,the simulation calculation model of connecting rod bearings was built,and the lubrication status of the connecting rod bearings of the two stroke marine diesel engine under rated working condition was analyzed by using finite element method.The results of one working cycle show that the small end bearing is always subjected to compression,the big end bearing is in tension in a short time,and the vertical load direction changes.The maximum value of the load of the connecting rod bearing appears at the time of maximum pressure in the cylinder.The orbit path of the small end bearing is always located in the smaller range of the lower half area,and the high oil pressure area is relatively concentrated.The orbit path of the big end bearing exists mainly in the upper right part of the shell.The distribution of the average oil film pressure of the two bearings is more concentrated.The minimum oil film thickness of the two bearings under the rated condition is above 3 μm,which can meet the requirements of hydrodynamic lubrication.
作者
武起立
周瑞平
陈天佑
董长清
张桂臣
WU Qili;ZHOU Ruiping;CHEN Tianyou;DONG Changqing;ZHANG Guichen(Merchant Marine College,Shanghai Maritime University,Shanghai 201306,China;School of Energy and Power Engineering,Wuhan University of Technology,Wuhan Hubei 430063,China)
出处
《润滑与密封》
CAS
CSCD
北大核心
2019年第2期103-108,共6页
Lubrication Engineering
关键词
船用柴油机
弹流润滑
连杆轴承
轴心轨迹
marine engine
elasto-hydrodynamic lubrication
connecting rod bearings
orbit path
