Electronic Science and Technology ›› 2019, Vol. 32 ›› Issue (3): 6-9.doi: 10.16180/j.cnki.issn1007-7820.2019.03.002

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Modeling Identification for High Order Process with Time-delay in the Frequency Domain

SHAN Yongming1,WANG Yagang1,WANG Kai1,2   

  1. 1. School of Optical-Electrical and Computer Engineering,University of Shanghai for Science and Technology,Shanghai 200093,China
    2. Shanghai Publishing and Printing College,University of Shanghai for Science and Technology,Shanghai 200093,China
  • Received:2018-03-18 Online:2019-03-15 Published:2019-03-01
  • Supported by:
    National Natural Science Foundation of China(61074087)


For the high order process with time-delay in industrial control systems, the second-order plus pure lag model was used to identify the frequency domain because it was difficult to design the controller. By sampling the input and output data of the object, the frequency response was analyzed and the important frequency segments were determined. Several important frequency response points were selected, and the system model parameters were estimated by the amplitude-frequency characteristics to achieve model reduction. The simulation results of MATLAB showed that the proposed method was suitable for a wide range of high-order time-delay objects and had good accuracy and robustness.

Key words: second-order plus pure lag model, frequency domain identification, frequency response, amplitude-frequency characteristic, model reduction, MATLAB simulation

CLC Number: 

  • TP273