Fractional Proportional Integral Control for Pneumatic Position Servo Systems

A novel fractional PI^alpha control strategy for pneumatic position servo system is presented in order to solve its strong non-linearity and low natural frequency problem. To demonstrate their better control characteristics, the fractional order control experiments under various conditions, which include step position signal, sine position signal with different frequency and amplitude, variety load etc, are carried out along with a detailed comparative analysis with traditional control. The results show the effectiveness of the proposed scheme and verify their fine control performance for pneumatic position servo system with the nonlinearity and parameter uncertainty.