故障模式下斜盘式轴向柱塞泵的流体振动传递路径分析

轴向柱塞泵是液压系统中的核心元件,其性能直接决定了整个系统的安全性和可靠性。而轴向柱塞泵故障也时常发生,最为常见的是三大摩擦副及轴承的失效故障。常常出现压力脉动、流量不达标、油液泄漏量大、壳体振动异常等多征兆问题,致使工作人员对其故障的溯源难以精准判别。但是轴向柱塞泵发生故障时壳体的异常振动对于各故障模式下其表现出来的时/频域曲线均不一致,所以本文对轴向柱塞泵正常及各种故障模式下进行流体振动产生机理及传递规律分析;建立柱塞泵流体振动传递路径模型及振动微分方程;利用MATLAB求解得到柱塞泵各模式下前、中、后壳体振动响应时/频域曲线,并提取典型故障特征信号。为轴向柱塞泵各故障模式下诊断提供理论依据。

Analysis on transfer path of fluid vibration of swash plate axial plunger pump under failure mode

Axial plunger pump is considered as the core component of hydraulic system, and its performance directly determines the safety and reliability. The complicated symptoms, such as pressure pulsation, substandard flow rate, large amount of oil leakage, abnormal shell vibration and so on caused by the faults of three friction pairs and bearing can improved the difficulties of accurately identifying the source of the faults for the researcher. However, the abnormal vibration time frequency curve of the shell in the different fault modes of axial plunger pump is inconsistent. Therefore, this paper analyzes the generation mechanism and transfer law of fluid vibration in the normal and various fault modes of axial plunger pump. The fluid vibration transfer path model and vibration differential equation of axial plunger pump are established. The vibration response curves in time/frequency domain of the front, middle and rear shell under various modes are presented by MATLAB, and typical fault characteristic signals are extracted. This paper provides theoretical basis for diagnosis of axial plunger pump in various fault modes.