Search

The design of a compound control is presented for the servo system of hydraulic flight motion simulator, which suffers from highly nonlinear dynamics, large parameter time-variation and severe load coupling among channels. The compound control is composed of a robust feedback controller and a feedforward compensator. The design aim is to achieve high tracking performance even in the presence of considerable uncertainty, external disturbance and load coupling among channels. Toward this aim the feedback controller for rejecting perturbation and disturbance is designed by using μ synthesis optimization technique and the feedforward compensator for compensating time lag of dynamic system is established based on the basic idea of zero phase error tracking. To validate the proposed control strategy, simulations and experiments are implemented, and show that the resulting system is highly robust against model perturbation and possesses excellent capability of suppressing the load coupling and improving the tracking performance.

The extra torque of electrohydraulic load simulator loading system affects its performance seriously. To eliminate the extra torque, the pressure servo valve control load simulator is proposed. This article establishes the electro-hydraulic load simulator mathematical model based on flow servo valve and pressure servo valve, analyzes the mechanism of overcoming extra torque load and simulation, provides the evidence of designing and selecting servo valve used in the passive electro-hydraulic load simulator to overcome the extra torque and improve system performance.