柴油机活塞缸套摩擦副润滑和多柔体动力学耦合特性

doi:10.16183/j.cnki.jsjtu.2022.357

上海交通大学学报 ›› 2024, Vol. 58 ›› Issue (3): 324-332.doi: 10.16183/j.cnki.jsjtu.2022.357

柴油机活塞缸套摩擦副润滑和多柔体动力学耦合特性

翟旭茂¹, 田新伟¹, 张传斌², 李玉娟¹, 刘硕², 崔毅²()

1.潍柴动力股份有限公司,山东潍坊 261061
2.上海交通大学动力机械与工程教育部重点实验室,上海 200240

收稿日期:2022-09-13 修回日期:2022-11-14 接受日期:2022-11-21 出版日期:2024-03-28 发布日期:2024-03-28
通讯作者: 崔毅,研究员,博士生导师,电话(Tel.):021-34206861;E-mail: ycui@sjtu.edu.cn.
作者简介:翟旭茂(1986-),硕士,高级工程师,从事柴油机润滑动力学及NVH开发研究.
基金资助:
国家自然科学基金(52171315)

Coupling Characteristics of Lubrication and Flexible Multibody Dynamics of Piston-Liner Pairs in Diesel Engines

ZHAI Xumao¹, TIAN Xinwei¹, ZHANG Chuanbin², LI Yujuan¹, LIU Shuo², CUI Yi²()

1. Weichai Power Co., Ltd., Weifang 261061, Shandong, China
2. Key Laboratory for Power Machinery and Engineering of the Ministry of Education, Shanghai Jiao Tong University, Shanghai 200240, China

Received:2022-09-13 Revised:2022-11-14 Accepted:2022-11-21 Online:2024-03-28 Published:2024-03-28

摘要/Abstract

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23.6 μm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%.

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

Abstract:

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 23.6 μm 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.

Key words: piston-liner pairs, tribo-dynamics, flexible multibody system, finite element method, diesel engines

中图分类号:

TK421.9

翟旭茂, 田新伟, 张传斌, 李玉娟, 刘硕, 崔毅. 柴油机活塞缸套摩擦副润滑和多柔体动力学耦合特性[J]. 上海交通大学学报, 2024, 58(3): 324-332.

ZHAI Xumao, TIAN Xinwei, ZHANG Chuanbin, LI Yujuan, LIU Shuo, CUI Yi. Coupling Characteristics of Lubrication and Flexible Multibody Dynamics of Piston-Liner Pairs in Diesel Engines[J]. Journal of Shanghai Jiao Tong University, 2024, 58(3): 324-332.

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参考文献 18

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参数	取值
标定转速/(r·min^-1)	2 600
标定功率/kW	140
缸径/mm	105
缸套弹性模量/GPa	117
缸套泊松比	0.26
活塞弹性模量/GPa	79
活塞泊松比	0.32
连杆长度/mm	190
曲柄半径/mm	59
活塞和缸套间名义径向间隙/μm	50
活塞缸套综合表面粗糙度/μm	5.07
润滑油动力黏度/(Pa·s)	0.008
微凸体接触摩擦因数	0.12
弹性系数	1.198×10^-4

柴油机活塞缸套摩擦副润滑和多柔体动力学耦合特性

Coupling Characteristics of Lubrication and Flexible Multibody Dynamics of Piston-Liner Pairs in Diesel Engines

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