System modeling and controller design using time series data

This paper described a method to estimate the transfer function of the system by applying DFT(Discrete Fourier Transform) to obtained time series data, and also presented a controller design method. Major parameters included in output signal were estimated using DFT. In addition, using the estimated parameters, we estimated the transfer function of the system and designed a controller. A system model was formulated by applying the proposed method to a DC motor system, and a controller was designed using the model. When the designed controller was applied, it improved the damping characteristic and overshoot of the system markedly and this confirmed the validity and reliability of the proposed method.