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Vol. 95, Issue 8, August 2008, pp.128-133




Model Based Tuning of Controller for an Aerobic System


J.Sumathi,  S.Sundaram*

Department of Electronics and Instrumentation Engineering, SASTRA University

Thanjavur- 613402, India

E-mail: sumathi@eie.sastra.edu, ssundar@sastra.edu



Received: 23 May 2008   /Accepted: 15 August 2008   /Published: 25 August 2008


Abstract: An aerobic system with varying downstream transportation lag was subjected to step response analysis to evaluate a suitable model using a dissolved oxygen sensor. The experimental data fitted a first order plus dead time model (FOPDT) with a maximum error of five percent. The model parameters were used to estimate various controller settings adopting methods such as Skogestad, Z-N, Smith predictor & IMC using MATLAB. A comparison of closed loop response using the estimated controller parameters suggested that IMC controller is best suited for this process.


Keywords: Aerobic process, Transportation lag, Modeling, PID, Smith Predictor, IMC


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