摘要
为研究四冲程车用柴油机活塞-缸套摩擦副的动力学及润滑特性,提出了一种新的活塞-缸套摩擦动力学耦合模型.模型中采用绝对节点坐标公式(ANCF)描述活塞-连杆-曲轴多柔体动力系统,采用平均雷诺方程和微凸体接触理论描述混合润滑模型,基于商用软件结合二次开发程序实现仿真计算.对活塞缸套摩擦副的润滑动力学计算分析表明,由于缸内压力和活塞敲击作用,缸套会产生最大值为23.6μm的瞬时变形.与刚体模型相比,考虑部件的弹性变形不仅会使活塞横向位移增加40%,还会使得活塞润滑域出现油膜压力的局部集中.另外,柔体模型的循环平均功耗更小,与刚体模型相比相差17.7%.
In this paper,a new piston-liner tribo-dynamic coupling model is proposed to study the dynamics and lubrication characteristics of the piston-liner friction pair of four-stroke vehicle diesel engines.In the model,the piston-rod-crankshaft flexible multibody dynamic system is described by absolute nodal coordinate formulation(ANCF),and the lubrication behavior is described by the averaged Reynolds equation and the Greenwood-Tripp asperity contact theory.The simulation is realized based on commercial software combined with self-developed codes.The results show that the liner has a maximum transient deformation of 23.6μm due to cylinder pressure and piston knocking behavior.Compared with the rigid model,the proposed model considering the elastic deformation increases lateral displacement of piston by 40%with oil film pressure concentration in lubrication domain.In addition,the friction power loss of flexible model in one cycle is smaller and 17.7%lower than that of rigid model.
作者
翟旭茂
田新伟
张传斌
李玉娟
刘硕
崔毅
ZHAI Xumao;TIAN Xinwei;ZHANG Chuanbin;LI Yujuan;LIU Shuo;CUI Yi(Weichai Power Co.,Ltd.,Weifang 261061,Shandong,China;Key Laboratory for Power Machinery and Engineering of the Ministry of Education,Shanghai Jiao Tong University,Shanghai 200240,China)
出处
《上海交通大学学报》
EI
CAS
CSCD
北大核心
2024年第3期324-332,共9页
Journal of Shanghai Jiaotong University
基金
国家自然科学基金(52171315)资助项目。
关键词
活塞-缸套摩擦副
润滑动力学
多柔体系统
有限元法
柴油机
piston-liner pairs
tribo-dynamics
flexible multibody system
finite element method
diesel engines
