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Received January 26, 2001
Accepted June 26, 2001
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Process Identification for an SOPDT Model Using Rectangular Pulse Input
Dept. of Chem. Eng., Pusan National University, Pusan 609-735, Korea 1Dept. of Chem. Eng., Dong-A University, Pusan 604-714, Korea
Korean Journal of Chemical Engineering, September 2001, 18(5), 586-592(7), 10.1007/BF02706372
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Abstract
A new method of process identification for a second-order-plus-dead-time model is proposed and tested with two example systems. In the activation of the example processes for the identification, a rectangular pulse input is applied to open loop systems. The model parameters are estimated by minimizing sum of modeling errors with the least squares method. The estimation performance is examined by comparing the output pulse responses from the example system and the estimated model. The performance comparison of the proposed method and two existing techniques indicates that satisfactory parameter estimation is available from the proposed procedure. In addition, the role of sampling time and the shape of input pulse is evaluated and it is found that the sampling time of less than 0.01 minute gives good estimation while the shape of input pulse does not affect the estimation performance. Finally, the robustness of the estimation in noisy process is proved from the investigation of the performance in the processes having various levels of noise.
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References
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Huang CT, Huang MF, Ind. Eng. Chem. Res., 32, 228 (1993)
Hwang C, Guo TY, Int. J. Control, 39, 807 (1984)
Johansson R, IEEE Trans. Signal Process., 42, 887 (1994)
Kuznetsov AG, Bowyer RO, Clark DW, Int. J. Control, 72(7), 629 (1999)
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Sagara S, Zhao ZY, Int. J. Control, 50, 457 (1989)
Sarara S, Yang ZJ, Kiyoshi W, Int. J. Control, 53, 391 (1991)
Soderstrom T, Fan H, Carlsson B, Bigi S, IEEE Auto. Control, 42, 659 (1997)
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Sung SW, Lee IB, Lee J, Automatica, 34(4), 513 (1998)
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Whitfield AH, Messali N, Int. J. Control, 45, 1431 (1987)
