Abstract
ABSTRACTPneumatic servo system is widely utilized in many industries, which has huge potential to replace hydraulic and electromechanical system due to its low-cost, high power quality ratio and quick response. There have been considerable control methods proposed to complete pneumatic position servo control. However, these methods still have some inevitable problems which remain to be settled. In this paper, a position feedback dynamic surface control is applied to the pneumatic system based on our pneumatic actuator model in order to provide a new idea for pneumatic position control. Considering model uncertainties, external force disturbance and noise interference, a modified dynamic surface controller is developed to overcome their negative effects. Besides, the stability of the pneumatic system with the modified controller is proved by Lyapunov's stability theorem. Moreover, the results of simulation and pneumatic experiment also verify that the dynamic surface controller is more advantageous than the traditional PID controller in pneumatic position servo control.
Highlights
With high dynamic performance, low pollution, safety and strong environmental adaptability, the servo pneumatic systems are widely used in the industrial automation field
To test the effect of the dynamic surface control (DSC) controller, a simulation experiment is designed to compare the performance between the traditional PID controller and DSC controller when a reference sine signal, a step signal and a ramp signal are input into the system
An modified dynamic surface controller (MDSC) based on position feedback is developed to try to accomplish pneumatic position servo control
Summary
Low pollution, safety and strong environmental adaptability, the servo pneumatic systems are widely used in the industrial automation field. Smoothness and rapidity of the pneumatic system, many engineers and scholars have proposed considerable researches on pneumatic position servo system to find the appropriate and high-performance control method. A fuzzy logic controller was implemented for controlling pneumatic servo systems actuated by pneumatic muscle (Sándor, Szabolcs, & József, 2017). Based on the theories about the pneumatic system, a proper mathematic model on pneumatic position servo system is put forward in this paper. The feasibility of the mathematical model and these designed controllers can be proved by the following actual pneumatic experiments. From the results of the experiment, it is obvious that compared to the traditional PID algorithm, the DSC method has better control performance and stronger robustness
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