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

doi:10.16183/j.cnki.jsjtu.2022.357

Abstract

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

CLC Number:

TK421.9

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.

Figures/Tables 11

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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