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On controlling pH

On controlling pH

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The paper summarises a recent investigation to find out what contribution could be made to pH regulation by modern algorithms for online estimation and/or adaptive control. Topics discussed include a mathematical model to account for nonlinearity; full-scale trials using selftuning controllers; a specially developed nonlinear estimator; use of resulting estimates to drive a suboptimal ‘cautious’ control law; and a specialpurpose CAD package. It is concluded that pH regulation is amenable to good engineering practice, and that whether or not this should include modern algorithms is a problem-specific question which can be answered using the CAD package.

References

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      • Proudfoot, C.G.: `Industrial implementation of on-line computer control of pH', 1983, DPhil thesis, University of Oxford.
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      • O.L.R. Jacobs , M.S. Briggs . Monte Carlo comparisons of estimators for pH nonlinearity. Trans. Inst. Meas. & Control , 6 , 287 - 292
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      • O.L.R. Jacobs . Recursive estimation for nonlinear Wiener systems by online implementation of Bayes rule. Trans. Inst. Meas. & Control , 5 , 245 - 250
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      • Hewkin, P.F.: `The control of pH using modern algorithms and online computers', 1979, D.Phil, thesis, University of Oxford.
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      • Jacobs, O.L.R., Badran, W.A.: `A computer package for designing pH regulation systems', Report 1506/3, 1983.
    17. 17)
      • Jacobs, O.L.R., Badran, W.A.: `CAD of pH control systems', 11.2/D/2, 9th IFAC congress, 1984, Budapest.
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