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Pre-compression volume on flow ripple reduction of a piston pump


Axial piston pump with pre-compression volume(PCV) has lower flow ripple in large scale of operating condition than the traditional one. However, there is lack of precise simulation model of the axial piston pump with PCV, so the parameters of PCV are difficult to be determined. A finite element simulation model for piston pump with PCV is built by considering the piston movement, the fluid characteristic(including fluid compressibility and viscosity) and the leakage flow rate. Then a test of the pump flow ripple called the secondary source method is implemented to validate the simulation model. Thirdly, by comparing results among the simulation results, test results and results from other publications at the same operating condition, the simulation model is validated and used in optimizing the axial piston pump with PCV. According to the pump flow ripples obtained by the simulation model with different PCV parameters, the flow ripple is the smallest when the PCV angle is 13°, the PCV volume is 1.3×10−4 m3 at such operating condition that the pump suction pressure is 2 MPa, the pump delivery pressure 15 MPa, the pump speed 1 000 r/min, the swash plate angle 13°. At the same time, the flow ripple can be reduced when the pump suction pressure is 2 MPa, the pump delivery pressure is 5 MPa,15 MPa, 22 MPa, pump speed is 400 r/min, 1 000 r/min, 1 500 r/min, the swash plate angle is 11°, 13°, 15° and 17°, respectively. The finite element simulation model proposed provides a method for optimizing the PCV structure and guiding for designing a quieter axial piston pump.

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Corresponding author

Correspondence to Bing Xu.

Additional information

This project is supported by National Key Technology R&D Program of the Eleventh Five-year Plan of China(Grant No. 2011BAF09B03), and National Natural Science Foundation of China(Grant No. 51075360)

XU Bing, born in 1971, is a professor at State Key Lab of Fluid Power and Mechatronic System, Zhejiang University, China. His main research interests include mechachonics engineering, fluid power element and system.

SONG Yuechao, born in 1981, obtained her PhD degree at Zhejiang University, China, in 2013. Her research interests include fluid power element.

YANG Huayong, born in 1961, is currently a professor and a PhD candidate supervisor at State Key Lab of Fluid Power and Mechatronic System, Zhejiang University, China. His main research interests include mechachonics engineering, fluid power transmission and control.

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Xu, B., Song, Y. & Yang, H. Pre-compression volume on flow ripple reduction of a piston pump. Chin. J. Mech. Eng. 26, 1259–1266 (2013).

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Key words

  • pre-compression volume
  • flow ripple
  • operating condition
  • axial piston pump