Erosion degradation characteristics of a linear electro-hydrostatic actuator under a high-frequency turbulent flow field  

作　　者：Yuan LI Shaoping WANG Mileta M.TOMOVIC Chao ZHANG 

机构地区：[1]School of Automation Science and Electrical Engineering, Beihang University [2]College of Engineering and Technology, Old Dominion University

出　　处：《Chinese Journal of Aeronautics》2018年第5期914-926,共13页中国航空学报（英文版）

基　　金：supported by the National Natural Science Foundation of China(Nos.51620105010,51675019,51575019);the National Basic Research Program of China(No.2014CB046402);the Program 111 of China

摘　　要：The paper proposes a performance degradation analysis model based on dynamic erosion wear for a novel Linear Electro-Hydrostatic Actuator（LEHA）. Rather than the traditional statistical methods based on degradation data, the method proposed in this paper firstly analyzes the dominant progressive failure mode of the LEHA based on the working principle and working conditions of the LEHA. The Computational Fluid Dynamics（CFD） method, combining the turbulent theory and the micro erosion principle, is used to establish an erosion model of the rectification mechanism. The erosion rates for different port openings, under a time-varying flow field, are obtained. The piecewise linearization method is applied to update the concentration of contaminated particles within the LEHA, in order to gain insight into the erosion degradation process at various stages of degradation. The main contribution of the proposed model is the application of the dynamic concentration of contamination particles in erosion analysis of Electro-Hydraulic Servo Valves（EHSVs）, throttle valves, spool valves, and needle valves. The effects of system parameters and working conditions on component wear are analyzed by simulations. The results of the proposed model match the expected degradation process.The paper proposes a performance degradation analysis model based on dynamic erosion wear for a novel Linear Electro-Hydrostatic Actuator（LEHA）. Rather than the traditional statistical methods based on degradation data, the method proposed in this paper firstly analyzes the dominant progressive failure mode of the LEHA based on the working principle and working conditions of the LEHA. The Computational Fluid Dynamics（CFD） method, combining the turbulent theory and the micro erosion principle, is used to establish an erosion model of the rectification mechanism. The erosion rates for different port openings, under a time-varying flow field, are obtained. The piecewise linearization method is applied to update the concentration of contaminated particles within the LEHA, in order to gain insight into the erosion degradation process at various stages of degradation. The main contribution of the proposed model is the application of the dynamic concentration of contamination particles in erosion analysis of Electro-Hydraulic Servo Valves（EHSVs）, throttle valves, spool valves, and needle valves. The effects of system parameters and working conditions on component wear are analyzed by simulations. The results of the proposed model match the expected degradation process.

关 键 词：Computational fluid dynamics Degradation characteristics Dynamic contaminated particles concentration EROSION Linear Electro-Hydrostatic Actuator Performance degradation 

分 类 号：V24[航空宇航科学与技术—飞行器设计]