Axial piston pumps are ubiquitous in the hydraulic systems employed on various off-highway machines such as hydraulic excavators or wheel-loaders. These pumps exhibit a fairly slow response to the commanded input resulting in a slow response of the work tool (implement or transmission) as well, which is undesirable to machine operators and also slows down the machine’s productivity. Hence it is very important to understand the factors affecting the dynamic pump response. Much of the earlier work aims at understanding the steady state behavior of the pump control system using linear transfer function analysis. A closed-form solution for the dynamic frequency response has not been reported in previous research. This work presents the analysis of a variable displacement pump with an adjustable swash-plate for the purposes of identifying parameters that contribute to the response characteristics of the pump. The full model of the pump involves a seventh order model including a large number of non-linear terms. Hence a reduced order model has also been derived for calculating the frequency response of the pump in the closed form and it is shown that the design parameters that impact the frequency response most heavily are the actuator area, the swash-plate moment arm, and the flow gain of the four-way valve. As it turns out, an increased frequency response of the pump may be most readily achieved by increasing the charge pressure which in turn reduces the required actuator area and increases the flow gain of the valve.
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ASME 2010 International Mechanical Engineering Congress and Exposition
November 12–18, 2010
Vancouver, British Columbia, Canada
Conference Sponsors:
- ASME
ISBN:
978-0-7918-4450-2
PROCEEDINGS PAPER
The Theoretical Frequency Response of an Over-Center, Pressure-Controlled, Axial Piston Pump Available to Purchase
Viral S. Mehta,
Viral S. Mehta
Caterpillar Inc., Peoria, IL
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Noah D. Manring
Noah D. Manring
University of Missouri - Columbia, Columbia, MO
Search for other works by this author on:
Viral S. Mehta
Caterpillar Inc., Peoria, IL
Noah D. Manring
University of Missouri - Columbia, Columbia, MO
Paper No:
IMECE2010-37391, pp. 1-8; 8 pages
Published Online:
April 30, 2012
Citation
Mehta, VS, & Manring, ND. "The Theoretical Frequency Response of an Over-Center, Pressure-Controlled, Axial Piston Pump." Proceedings of the ASME 2010 International Mechanical Engineering Congress and Exposition. Volume 13: Sound, Vibration and Design. Vancouver, British Columbia, Canada. November 12–18, 2010. pp. 1-8. ASME. https://doi.org/10.1115/IMECE2010-37391
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