Coupling Characteristics of Lubrication and Flexible Multibody Dynamics of Piston-Liner Pairs in Diesel Engines
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...
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Published in | Shànghăi jiāotōng dàxué xuébào Vol. 58; no. 3; pp. 324 - 332 |
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Main Author | |
Format | Journal Article |
Language | Chinese |
Published |
Editorial Office of Journal of Shanghai Jiao Tong University
01.03.2024
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Subjects | |
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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. |
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AbstractList | 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. |
Author | ZHAI Xumao, TIAN Xinwei, ZHANG Chuanbin, LI Yujuan, LIU Shuo, CUI Yi |
Author_xml | – sequence: 1 fullname: ZHAI Xumao, TIAN Xinwei, ZHANG Chuanbin, LI Yujuan, LIU Shuo, CUI Yi organization: 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 |
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SubjectTerms | diesel engines finite element method flexible multibody system piston-liner pairs tribo-dynamics |
Title | Coupling Characteristics of Lubrication and Flexible Multibody Dynamics of Piston-Liner Pairs in Diesel Engines |
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