Angular Displacement Control Technology of Variable Displacement Hydraulic Motor Rotary Drive System
Variable displacement hydraulic motor rotary drive system has the advantages of high efficiency,fast response,high load matching and low power demand,which can greatly improve the efficiency of aircraft hydraulic rotary drive system.In order to realize accurate control of the variable displacement hydraulic motor rotary drive system,it is necessary to carry out research on angular displacement control technology.The mathematical model and AMESim simulation model of the system are established,and the motion characteristics and frequency domain control characteristics of the system are analyzed.A three-closed loop cascade control scheme consisting of displacement loop,speed loop and angular displacement loop is proposed,and the influence of different control parameters on the control characteristics of the system is studied.The research results show that the double closed-loop control can't meet the stability conditions of the rotary drive system,and the introduction of negative feedback of rotational speed in the three closed-loop control overcomes the positive feedback effect of angular displacement on rotational speed in the double closed-loop control,increases the damping of the displacement loop,and realizes the stable control of the system.At the same time,a prototype is developed and tested.The test data show that the three-closed loop cascade control scheme can realize high-precision displacement control of the rotary drive system.It provides a reference for the application of variable motor in the aircraft hydraulic rotary drive system.
variable displacement hydraulic motorrotary driveself-adaptive power regulationangular displacement controlthree-closed loop cascade control
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