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Impact of typical steady-state conditions and transient conditions on flow ripple and its test accuracy for axial piston pump

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Abstract

The current research about the flow ripple of axial piston pump mainly focuses on the effect of the structure of parts on the flow ripple. Therein, the structure of parts are usually designed and optimized at rated working conditions. However, the pump usually has to work in large-scale and time-variant working conditions. Therefore, the flow ripple characteristics of pump and analysis for its test accuracy with respect to variant steady-state conditions and transient conditions in a wide range of operating parameters are focused in this paper. First, a simulation model has been constructed, which takes the kinematics of oil film within friction pairs into account for higher accuracy. Afterwards, a test bed which adopts Secondary Source Method is built to verify the model. The simulation and tests results show that the angular position of the piston, corresponding to the position where the peak flow ripple is produced, varies with the different pressure. The pulsating amplitude and pulsation rate of flow ripple increase with the rise of pressure and the variation rate of pressure. For the pump working at a constant speed, the flow pulsation rate decreases dramatically with the increasing speed when the speed is less than 27.78% of the maximum speed, subsequently presents a small decrease tendency with the speed further increasing. With the rise of the variation rate of speed, the pulsating amplitude and pulsation rate of flow ripple increase. As the swash plate angle augments, the pulsating amplitude of flow ripple increases, nevertheless the flow pulsation rate decreases. In contrast with the effect of the variation of pressure, the test accuracy of flow ripple is more sensitive to the variation of speed. It makes the test accuracy above 96.20% available for the pulsating amplitude of pressure deviating within a range of ±6% from the mean pressure. However, with a variation of speed deviating within a range of ±2% from the mean speed, the attainable test accuracy of flow ripple is above 93.07%. The model constructed in this research proposes a method to determine the flow ripple characteristics of pump and its attainable test accuracy under the large-scale and time-variant working conditions. Meanwhile, a discussion about the variation of flow ripple and its obtainable test accuracy with the conditions of the pump working in wide operating ranges is given as well.

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Authors and Affiliations

  1. State Key Laboratory of Fluid Power Transmission and Control, Zhejiang University, Hangzhou, 310027, China

    Bing Xu, Min Hu & Junhui Zhang

Authors
  1. Bing Xu
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  2. Min Hu
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  3. Junhui Zhang
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Corresponding author

Correspondence to Bing Xu.

Additional information

Supported by National Basic Research Program of China (973 Program, Grant No. 2014CB046403), and National Key Technology R&D Program of the Twelfth Five-year Plan of China (Grant No. 2013BAF07B01)

XU Bing, born in 1971, is a professor at State Key Laboratory of Fluid Power Transmission and Control, Zhejiang University, China. His main research interests include mechatronics control, fluid power components and systems.

HU Min, born in 1985, is currently a PhD candidate at State Key Laboratory of Fluid Power Transmission and Control, Zhejiang University, China. His research interests include axial piston pump and energy efficiency.

ZHANG Junhui, born in 1984, obtained his PhD degree from Zhejiang University, China, in 2013. His research interests include axial piston pump and fluid born noise control.

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Xu, B., Hu, M. & Zhang, J. Impact of typical steady-state conditions and transient conditions on flow ripple and its test accuracy for axial piston pump. Chin. J. Mech. Eng. 28, 1012–1022 (2015). https://doi.org/10.3901/CJME.2015.0703.085

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  • DOI: https://doi.org/10.3901/CJME.2015.0703.085

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