Nonlinear Compound Control of Pneumatic Servo Loading System

The pneumatic servo system is suitable for servo loading test of a momentary expansion mechanism with its compressibility and easy realization of high speed. By analyzing the strong nonlinear and dynamic uncertainties in the pneumatic servo system, a nonlinear composite control strategy is proposed. Different control methods are designed for different features. Through the linearization of feedback, the output control is divided into two parts - the linear part and the nonlinear part. The linear control component is designed by the pole placement principle to ensure the stability of the system. The linear matrix inequality is solved by Maltab LMI toolbox. Based on the lack of robustness of the system, the Lyapunov re-design method is used to design the nonlinear control components to ensure the robustness of the system. The ITAE optimization algorithm is used to solve the system to ensure the tracking accuracy and fastness. The composite control method is used to improve the adverse effects of nonlinear and dynamic uncertainties on the performance of the system, and the effect of the system is improved by the combination of theoretical analysis, digital simulation and experimental comparison. Dynamic performance and control quality.