Presenting the mathematical model of the variable flow rate axial piston pump with the displacement control valve

Document Type : Original Article

Author

Assistant Professor, Department of Mechanical Engineering, Jundi Shapur University of Technology, Dezful, Iran

10.22034/ijme.2023.398687.1783

Abstract

Nowadays, for optimal control of oil pressure and reduction of energy consumption in hydraulic circuits used in fixed and moving machines, it is necessary to change the displacement volume of the pump proportional to the load on the moving part of the hydraulic actuator. For this purpose, in this paper, a displacement control valve with negative overlap is used in the axial piston pump structure. In order to evaluate the performance of the displacement control valve, the mathematical relations governing the axial piston pump were written in the frequency domain. Examining the presented mathematical model showed that the order of transform function of the axial piston pump in three different working conditions, including increase, decrease, and stabilization of the displacement volume is 7, 5, and 3, respectively. To evaluate the correctness of the presented mathematical model, the design and construction of the hydraulic power transmission system including the axial piston pump, fixed displacement hydraulic motor, and flow control valve without pressure compensator was carried out. The appropriate matching of the frequency response obtained from the experimental results with the results obtained from the mathematical model, especially at low frequencies, confirmed the validity of the presented mathematical model. Further investigations showed that the use of the displacement control valve to change the flow rate of the axial piston pump in three working conditions resulted in the stable operation of the pump in the hydraulic power transmission system.

Keywords

References

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