Coupled evolution of piston asperity and cylinder bore contour of piston/cylinder pair in axial piston pump  

作　　者：Fei LYU Junhui ZHANG Shoujun ZHAO Kun LI Bing XU Weidi HUANG Haogong XU Xiaochen HUANG 

机构地区：[1]State Key Laboratory of Fluid Power and Mechatronic Systems,Zhejiang University,Hangzhou 310027,China [2]Beijing Institute of Precision Mechatronics and Controls,Beijing 100076,China [3]Qing’an Group Co.,Ltd.,Xi’an 710077,China

出　　处：《Chinese Journal of Aeronautics》2023年第8期395-407,共13页中国航空学报（英文版）

基　　金：financially supported by the National Key Research and Development Program of China(No.2018YFB2001101);the National Outstanding Youth Science Foundation of China(No.51922093);the National Natural Science Foundation of China(No.51890882).

摘　　要：The wear condition of the piston/cylinder pair is crucial to the performance and reliability of the axial piston pump.The hard piston surface,the soft cylinder bore surface,and the interface oil film affects each other during the wear process.Specifically,in the mixed lubrication region,the geometry of the hard piston surface asperity directly affects the wear of soft cylinder bore surface,while the asperities may deform or even degrade when penetrating and sliding against the cylinder bore.So far,there is no suitable method to simulate their coupled evolution.This paper proposed a wear process simulation model considering the real-time interaction between the elasto-plastic deformation of the piston surface asperity,the wear contour of the cylinder bore,and the lubrication condition of the interface.An offline library of the elasto-plastic constitutive behavior of the asperity based on the finite element method(FEM)is established as a part of the simulation model to precisely analyze the deformation and degradation of the asperity and quickly invoke them in the numerical wear process simulation.The simulation and experimental results show that the piston asperity and the cylinder bore contour converge to a steady state after running-in for about 0.5 h.The distribution of the simulated asperity degradation and wear depth is also verified by the experiment.

关 键 词：ASPERITY CONTOUR Coupled evolution Piston/cylinder pair Wear process 

分 类 号：TH137.51[机械工程—机械制造及自动化]