Aircraft Rudder Load Simulation Computer Control System Design And Implementation

This paper discusses how to design and realize the computer control system of simulative aerodynamic loading. Based on the application of modem control in simulative aerodynamics loading and its digitalization, control strategy is selected, controller is designed accordingly and is applied into practice. The main contributions of this paper are as follows: First, a global review on the development of the simulative aerodynamic loading control system is introduced, and then on the basis of its working theory, a mathematical model of the system is constructed. Redundant force, which is produced through position disturbance, is a chief problem facing aerodynamic loading system. So how to eliminate the redundant force by selecting proper control strategy is a main aspect discussed in this paper. By applying the structure invariant theory in the control strategy, an equivalent structure invariant loading system is produced, which proved to be very effective in reducing the redundant force. Related simulations are illustrated in Matlab. In order to improve the performance of the control system, the feedforward- feedback control theory is applied in the control system design. In the feedforward channel, a PID controller is mounted to eliminate the redundant force, while in the main channel a Fuzzy-PID controller is designed to improve the performance of the control system. In particular, the method of Fuzzy-PID controller design is thoroughly discussed. Numeric simulation results were satisfactory which prove the feasibility of the control strategy. Finally, the realization of the whole system is illustrated from the aspects of hardware and software. Problems appearing at work and tackling methods are both presented.