Journal of Jilin University(Engineering and Technology Edition) ›› 2021, Vol. 51 ›› Issue (6): 1967-1974.doi: 10.13229/j.cnki.jdxbgxb20200559

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Reliability analysis of piston pump under random flow rate

Zun-ling DU(),Yi-min ZHANG()   

  1. School of Mechanical Engineering，Shenyang University of Technology，Shenyang 110870，China
  • Received:2020-07-24 Online:2021-11-01 Published:2021-11-15
  • Contact: Yi-min ZHANG E-mail:dzl2022@163.com;zhangyimin@syuct.edu.cn

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Abstract:

In this paper, the average clearance leakage flow of the whole piston pump is derived by analyzing the clearance leakage flow of each friction pair of the piston pump, and the total leakage flow and volumetric efficiency model are established. The flow of the piston pump is random due to the random uncertainty of the size tolerance and the operating conditions during the manufacturing and operation of the piston pump. The volumetric efficiency which is closely related to the random flow is selected as the reliability criterion, and a practical reliability and sensitivity analysis method for the flow characteristics of the piston pump was proposed. The accuracy of the proposed method was verified by Monte-Carlo stochastic numerical simulation. The results show that the volumetric efficiency reliability of piston pump increases with the tilt angle of swash plate and rotation speed, and decreases with the increase of oil discharge pressure. The sensitivity of the of the basic random variables to the influence of the reliability is obviously different, and the slipper pair clearance is the most sensitive to the influence of reliability in many clearances of friction pairs.

Key words: hydraulic transmission and control, piston pump, reliability analysis, random flow rate, advanced first-order second moment

CLC Number: 

  • TH322

Fig.1

Schematic diagram of structure and clearance leakage flows of the swash plate axial piston pump"

Fig.2

Flow chart of reliability analysis of piston pump"

Table 1

Probability distribution information ofbasic random variable of piston pump"

随机变量分布类型均值变异系数
δss/m正态分布1.5×10-50.005
δsp/m正态分布1.5×10-50.005
δpc/m正态分布1.5×10-50.005
δcv/m正态分布1.5×10-50.005
dp/m正态分布0.016 70.005
Rp/m正态分布0.030 650.005
γ/（°）正态分布17.50.05
μ/（Pa?s）正态分布0.0280.05
pd/Pa正态分布21×1060.05

Fig.3

Curve of volumetric efficiency of piston pumpat different rotational speeds"

Fig.4

Curve of volumetric efficiency of pistonpump at different pressures"

Fig.5

Reliability curve of axial piston pump"

Fig.6

Reliability surface of axial piston pump"

Fig.7

Dimensionless mean sensitivity ofaxial piston pump"

Fig.8

Dimensionless variance sensitivity ofaxial piston pump"

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