摘要
在考虑曲轴轴颈和轴承变形及其表面粗糙度的基础上,采用有限元法和有限差分法相结合计算油膜特性,在分析的过程中采用基于模态压缩法的多体动力学和前两种方法耦合.得到了700～1,500,r/min范围内的5个转速不同曲轴转角下的主轴承最小油膜厚度、最大油膜压力和某个转角下的轴承油膜压力分布和机油填充率.同时也得到了10,μm～40,μm范围内的初始轴系间隙下最大油膜压力、最小油膜厚度和最大摩擦损失变化趋势.结果表明,最小油膜厚度和最大油膜压力出现在不同的曲轴转角,主轴承上的油膜压力的分布与机油的填充率有关.随着初始轴系间隙从10,μm增加到40,μm,最大摩擦损失一直在减小,且这个过程轴承最大摩擦损失减少了大约4,kW.
On the basis of considering the deformation and surface roughness of the crankshaft and bearing, the finite element method （FEM） and finite difference method （FDM） are combined to analyze the oil film characteristics. In the course of the analysis, the multi-body dynamic （MBD） method based on component mode synthesis is combined with the two former methods. The minimum film thickness and the maximum film pressure of different main bearings at different crank angles are analyzed in the speed region of 700 r/min--1 500 r/min, and the oil film pressure distribu- tion and oil filling rate at certain crank angle are obtained. At the same time, the trend of the maximum film pressure, the minimum film thickness and the friction loss can also be obtained with the initial clearances changing from 10 μm to 40 μm. The results show that the minimum film thickness and maximum film pressure occur at different crank an- gles. There is an important relationship between the distribution of film pressure and the oil filling rate. With the increase of initial clearances from 10 μm to 40 μm, the maximum friction loss decreases by about 4 kW.
出处
《天津大学学报》
EI
CAS
CSCD
北大核心
2011年第9期791-797,共7页
Journal of Tianjin University(Science and Technology)
基金
国家自然科学基金资助项目(50975192)
高等学校博士点专项科研基金资助项目(20090032110001)
教育部博士点基金资助项目(20090032110001)
关键词
柴油机
轴系
油膜压力
最小油膜厚度
摩擦损失
diesel engine
shafting
oil film pressure
minimum oil film thickness
friction loss
