H∞ mixed sensitivity designing for displacement regulation of airborne variable displacement pump supplying

As a supplying component of airborne hydraulic power actuator, the stability and accuracy of flow discharged by pump supplying directly impact the working stability of the whole hydraulic system loop. A robust controller of airborne pump supplying displacement regulation is designed by using H_∞ mixed sensitivity control algorithm in this paper. It is aimed at the characters of sensitivity function and complementary sensitivity function, based on the requirement of frequency-domain of displacement regulation loop, achieved satisfactory closed-loop control performance by selecting suitable weight function. The impacts originated from disturbance and parameters uncertainty in the model were depressed. The desired frequency-domain performance could directly achieved by using the control algorithm, it is useful for practicing. The simulation and test show that the controller present in this paper demonstrate a better robustness and effectiveness on disturbance depression and parameter variation. It is a development direction on pump supplying intelligent control.