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Mathematical Problems in Engineering
Volume 2014 (2014), Article ID 352981, 10 pages
http://dx.doi.org/10.1155/2014/352981
Research Article

Dynamic Pressure Gradient Model of Axial Piston Pump and Parameters Optimization

1School of Automation and Electrical Engineering, Beihang University, Beijing 100191, China
2Science and Technology on Aircraft Control Laboratory, Beihang University, Beijing 100191, China

Received 21 October 2013; Revised 5 January 2014; Accepted 6 January 2014; Published 12 February 2014

Academic Editor: Evangelos J. Sapountzakis

Copyright © 2014 Shi Jian et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

The unsteady pressure gradient can cause flow noise in prepressure rising of piston pump, and the fluid shock comes up due to the large pressure difference of the piston chamber and discharge port in valve plate. The flow fluctuation control is the optimization objective in previous study, which cannot ensure the steady pressure gradient. Our study is to stabilize the pressure gradient in prepressure rising and control the pressure of piston chamber approaching to the pressure in discharge port after prepressure rising. The models for nonoil shock and dynamic pressure of piston chamber in prepressure rising are established. The parameters of prepressure rising angle, cross angle, wrap angle of V-groove, vertex angle of V-groove, and opening angle of V-groove were optimized, based on which the pressure of the piston chamber approached the pressure in discharge port after prepressure rising, and the pressure gradient is more steady compared to the original parameters. The max pressure gradient decreased by 70.8% and the flow fluctuation declined by 21.4%, which showed the effectivness of optimization.