Nonlinear Model-based Control of PWM Ram-air Servo System and Analysis of Robust Stability

The model of ram-air servo system was built, and a control methodology that enabled nonlinear model-based control of pulse width modulated the servo system was proposed. Because of the high nonlinear characteristics exhibited by pneumatic actuators due to the compressibility of air, the complicity of friction and the nonlinearity of valves, the controller was designed, and the problem of robust strict-sense Hurwitz stability was considered. Finally, the proposed method was verified through simulation and the performance was evaluated by experiments.