Jincheng Nanjing Electrical and Hydraulic Engineering Research Center

Nanjing, China

Jincheng Nanjing Electrical and Hydraulic Engineering Research Center

Nanjing, China

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Hao Z.,Beihang University | Zeng S.,Beihang University | Guo J.,Beihang University | Ma J.,Beihang University | Li Q.,Jincheng Nanjing Electrical and Hydraulic Engineering Research Center
Beijing Hangkong Hangtian Daxue Xuebao/Journal of Beijing University of Aeronautics and Astronautics | Year: 2016

Keys of quantitative reliability design lie in the establishment of the quantitative reliability model. Current modeling methods mainly rely on design staff's knowledge on product failure rules, including failure modes, environmental disturbances, failure mechanisms, etc. However, the inherent finiteness and imperfection of knowledge are bound to bring both model error and input uncertainties to the quantitative reliability model. To address this problem, we proposed a knowledge-and-data integrated Bayesian modeling method to develop the quantitative reliability model, quantifying the model error and input uncertainties. First of all, the tasks of the knowledge-and-data integrated modeling of the quantitative reliability model were explained, and the corresponding framework was established. Then the principle of Bayesian integration of knowledge and data was clarified. After that, the general method of Bayesian integration of knowledge and data was proposed, and two specific Bayesian integration methods for both performance fluctuation and degradation data were addressed respectively. Finally, the effectiveness and feasibility of the proposed method were illustrated by a case of an airborne axial piston pump. © 2016, Beijing University of Aeronautics and Astronautics (BUAA). All right reserved.


Ma J.,Beihang University | Chen J.,Beihang University | Li J.,Xi'an Jiaotong University | Li Q.,Jincheng Nanjing Electrical and Hydraulic Engineering Research Center | Ren C.,Jincheng Nanjing Electrical and Hydraulic Engineering Research Center
Tribology International | Year: 2015

The paper presents a method on the basis of Elasto Hydrodynamic Lubrication (EHL) model to analyze the wear behavior of swash plate/slipper pair. Based on the analysis of film thickness, the associated internal factors affecting the wear behavior are identified by considering comprehensively parameters of structure, working conditions and material properties. The comparison of the wear masses of theoretical analysis and wear tests verifies the proposed method. The relationships between wear rate of the friction pair and associated parameters are analyzed. Research results can be utilized to compile the accelerated test load spectrum and contribute to optimizing the pump design. © 2015 Elsevier Ltd. All rights reserved.


Ma J.,Beihang University | Li Q.,Jincheng Nanjing Electrical and Hydraulic Engineering Research Center | Ren C.,Jincheng Nanjing Electrical and Hydraulic Engineering Research Center | Chen J.,Beihang University
Beijing Hangkong Hangtian Daxue Xuebao/Journal of Beijing University of Aeronautics and Astronautics | Year: 2015

Wear of swash plate-slipper moving pair (slipper pair) of hydraulic axial piston pump results in increasing leakage, declining efficiency, and finally shorting the lifetime. An accelerated lifetime test method was presented based on the elasto hydrodynamic lubrication (EHL) wear model. As the most important factor effecting on wear process, oil film thickness of slipper pair was primarily analyzed. Running parameters (temperature/rotation speed/pressure) were integrated and considered when analyzing the wear, and the intrinsic factors affecting the wear process of sliding pair were revealed. An axial piston pump is selected as the study case. Firstly, under two different running conditions, wear amounts of slipper pair were analyzed and the analysis results were compared with long term test results, which verify the accuracy of analysis results of wear amounts and the feasibility of the method and mode. Then, based on the proposed method and wear analysis model, the relative relationship between medium temperature (viscosity), output pressure, rotate speed and wear ratio of slipper pair were analyzed comparatively. Finally, discussions about the accelerated means of piston pump when executing an wear accelerated lifetime test and the effects of working condition on acceleration ratio were given. Research result can be utilized to create the load spectrum of accelerated wear test of piston pump, and is also useful to do optimization for reducing wear of piston pump. ©, 2015, Beijing University of Aeronautics and Astronautics (BUAA). All right reserved.

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