Dynamic Characteristics and Functional Complex Analysis of Double Axial Piston Pumps
In response to the difficulty of power distribution and composite control mode switching for the digital variable displacement double axial piston pumps,initially,a mathematical model of the variable mechanism is established,based on its mechanical-hydraulic servo variable principle,and an analysis of the factors influencing the pump frequency response is conducted.Subsequently,mathematical models for modified cross-power control,load-sensitive control,and pressure cut-off control of the double axial piston pumps are formulated.The efficacy of the modified cross-power control is validated by simulation analysis.On this basis,a composite control strategy integrating power,flow,and pressure control,based on the minimum value of the control signal,is proposed.Finally,a mechanical-hydraulic simulation model of the double-pump system is constructed using the AMESim platform.The results confirm that increasing the valve flow coefficient,spool end face area,decreasing the spring stiffness,variable plunger area,and swashplate swing radius could improve the frequency response of the variable pump.Furthermore,the modified cross-power control strategy is shown to expand the variable working area of the pump by approximately 15％and augment the range of electric motor power distribution among the double pumps.
万方数据
维普
