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With the rapid development of the hydraulic drive system , especially construction machinery , hydraulic system , the hydraulic pump as a hydraulic power source . The performance and reliability of the hydraulic pump greatly affects the performance and reliability of the entire hydraulic system . High-speed , high pressure is the development direction of axial hydraulic pump for the hydraulic pump , the design work for a very high demand . Domestic piston pump, especially the twin axial piston pump is widely used in engineering machinery research started late , mastered the core technology , high-performance pumps are mostly dependent on imported products . This also restricts the development of the domestic construction machinery manufacturers , research key double axial piston pump technology has important practical significance . First, the paper analyzes the main factors of the double axial piston pump works and the impact of the flow characteristics of its output . Control valve kinematics and dynamics model , and is directly related to the flow characteristics of the valve plate orifice flow area of ??mathematical models , which laid the foundation for the subsequent double axial piston pump simulation model . Secondly, the establishment of a macro - flow and micro- leakage model twin axial piston pump flow characteristics . Based multidisciplinary simulation software SimulationX build a simulation model of the double axial piston pump , the pump flow , pressure pulsation rate , and the pressure in the course of their work flow (P? Q) characteristic curve obtained by simulation . And , on this basis , to obtain the piston pumps each of the major leakage characteristics of the kinematic pair , to thereby obtain a complete piston pump flow characteristics . Finally, the solution in the actual experiment encountered P ? Q feature exists the problem of the hysteresis loop . Through theoretical analysis and modeling and simulation to identify the main reason for this phenomenon , making the physical transformation after the experiment to verify the correctness of the theoretical analysis and modeling and simulation .
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