Abstract
The signal compression method, which was proposed and named by this author, was applied for a measurement of impulse response and Bode diagram of a model flow control system. This method uses special computer generated test signal, which can be compressed to an impulse-like signal by the computer manipulation. The test signal is applied to the unknown system, whose response can be compressed to the impulse response of the system. This method can improve S/N ratio immensely compared with conventional system identification methods.
The model control system consists of a blower, an air flow pipe, a valve, an orifice, a flow signal transmitter and a PI controller. The open-loop and closed-loop response of this system were measured by the signal compression method. The closed-loop characteristics were calculated from measured open-loop response, and showed good agreement with measured closed-loop respone. Discussions are made about the possibility of applying this method to the measurement of industrial control system characteristics.
