摘要
滑靴磨损是柱塞泵高发故障。针对某型航空发动机燃油柱塞泵滑靴磨损引发的泵流量下降、振动超限故障,给出了一种基于动力学、摩擦学、流体润滑及结构强度多学科框架的故障综合诊断方法,对该型燃油柱塞泵在多个运行工况滑靴的油膜厚度、结构强度及pv值开展计算仿真,分析了各工况与磨损故障的关联机理。研究结果表明:燃油柱塞泵的滑靴结构强度在全工况范围内均满足要求,且在低于4500 r/min转速范围内燃油柱塞泵滑靴副油膜特征良好;但在燃油柱塞泵转速逐渐上升时,滑靴副受到的轴向惯性力和离心力对压紧力贡献占比逐步增加,当转速增加至5000 r/min,支撑力无法有效抵偿外部压紧力,导致滑靴副静压油膜破裂,滑靴与斜盘从流体润滑状态转为边界润滑或直接接触状态;而高转速工况下滑靴副的材料pv值处于超限状态,最终导致磨损失效。
Slipper wear is a common failure in piston pumps.Aimed at the failures of the flow rate decrease and excessive vibration of the pump caused by slipper wear in the fuel piston pump of a certain type of aero-engine,a comprehensive failure diagnosis method is proposed within the framework of multiple disciplines including dynamics,tribology,fluid lubrication,and structural strength.The calculation and simulation of the oil film thickness,structural strength,and pv value of the slipper of this type of fuel piston pump under multiple operating conditions are carried out,and the associated mechanism between each operating condition and the wear failure is analyzed.The research results show that the structural strength of the slipper of the fuel piston pump meets the requirements within the full operating condition range,and the oil film characteristics are favorable when the rotational speed is below 4500 r/min.However,when the rotational speed of the fuel piston pump gradually increases,the proportion of the axial inertial force and centrifugal force acting on the slipper pair in the contribution to the pressing force gradually increases.When the rotational speed increases to 5000 r/min,the supporting force cannot effectively compensate for the external pressing force,resulting in the rupture of the hydrostatic oil film of the slipper pair.The slipper and the swash plate change from the fluid lubrication state to the boundary lubrication state or the direct contact state.Moreover,the pv value of the material of the slipper pair is in an over-limit state under the high rotational speed operating condition,which ultimately leads to wear failure.
作者
龙运伟
邵雪嵩
蒋智宇
赵志杰
符江锋
LONG Yunwei;SHAO Xuesong;JIANG Zhiyu;ZHAO Zhijie;FU Jiangfeng(AECC Guizhou Honglin Aeroengine Control Technology Co.,Ltd.,Guiyang,Guizhou 550025;College of Power and Energy,Northwestern Polytechnical University,Xi'an,Shaanxi 710072)
出处
《液压与气动》
北大核心
2025年第8期43-55,共13页
Chinese Hydraulics & Pneumatics
基金
国家自然科学基金面上项目(52372396)
国防技术基础(JSZL2023213S001)。
关键词
燃油柱塞泵
滑靴副
故障诊断
润滑分析
强度分析
fuel piston pump
slipper pair
failure diagnosis
lubrication analysis
strength analysis
