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Abstract: A high noise level is one of the prominent shortcomings of an axial piston pump which is widely used in industrial and mobile applications. In this paper, a simulation model of an axial piston pump is developed based on a single piston chamber model, for capturing the dynamic characteristics of the discharge flow rate. The compressibility of fluid and main leakages across different friction pairs are considered. The simulation model is validated by a comparison of discharge flow ripple with the measured results using the secondary source method. The main cause of flow ripple is identified by a comparison of the frequency spectrums of actual and kinematic flow ripples. Flow rates with different index angles are analyzed in time and frequency domains. The findings show that an index angle of 20° is the most effective in reducing the flow ripple of a tandem axial piston pump, because the frequency contents at odd harmonics can be cancelled out. A sensitivity analysis is conducted at different pressure levels, speeds, and displacement angles, which reveals that with an index angle of 20°, the sensitivity of flow ripple can be reduced by almost 50% over a wide variety of working conditions.

The authors derived a simulation model of an axial piston pump to express its flow rate ripple, taking the fluid compressibility and main leakages across different friction pairs into consideration. Based on the results using the simulation model they claimed that the best index angle is 20° for a tandem axial piston pump utilizing nine pistons within one rotating group.

转位角对串联式轴向柱塞泵流量脉动的影响

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