Direct digital control is applied to a pilot-scale triple heat exchanger employing two single-board microcomputers, one for control and the other for data acquisition. Comparison is made on the performance of six control algorithms for the control of the heat exchanger. In particular, the branched predictive controller and the variable precompensator based on inverse Nyquist array method are selected for single-variable and two-variable controls of the pilot plant, respectively.
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References
1.
Ahson, S.I. and Nicholson, H.1976. 'Improvement of turbo-alternator response using the inverse Nyquist array method', Int J Control, 23(5), 657—672.
2.
Bellutrutti, J.J. and MacFarlane, A.G.J.1971. 'Characteristic loci techniques in multivariable control system design', Proc IEE, 118(9), 1291-1297.
3.
Chiu, P.C. and Fung, E.H.K.1982. 'Temperature transients in a triple heat exchanger', accepted for publication in Proc I Mech E, Part C, Mechanical EngineeringScience.
4.
Cohen, G.H. and Coon, G.A.1953. 'Theoretical consideration of retarded control ', Trans ASME, 75, 827—834.
5.
Fallside, F. and Seraji, H.1971. 'Direct design procedure for multivariable feedback systems ', Proc IEE, 118(6), 797-801.
6.
Gayler, J.R. et al. 1977. 'Multivariable control of a mixing process , in Digital computer applications to process control, Van Nauta Lemke, IF AC andNorth-Holland Publishing Company , 471-477.
7.
Gilles, G. and Nougaret, M.1972. 'Optimal control of a pilot heat exchanger', Fifth IFAC World Congress, Paris, Paper No 36—3.
8.
Hawkins, D.J.1972. 'Pseudodiagonalisation and the inverse Nyquist array method ', Proc IEE, 119(3), 337-342.
9.
Jacob, D. and Donaghey, L.F.1977. 'Microcomputer implementation of direct digital control algorithms for thermal process control applications', Journal of Dynamic Systems, Measurement and Control, Trans ASME, 99(4), 232-240.
10.
McMorran, P.O.1970 'Design of gas-turbine controller using the inverse Nyquist method', Proc IEE, 117(10), 2050—2056,
11.
Rosenbrock, H.H.1969. 'Design of multivariable control systems using the inverse Nyquist array', Proc IEE, 116(11), 1929—1936.
12.
Uronen, P. and Yliniemi, L.1977. 'Experimental comparison and application of different DDC algorithms', in Digital computer applications to process control, Van Nauta Lemke, IFAC and North-Holland Publishing Company, 457—464.
13.
Ziegler, J.G. and Nichols, N.B.1942. 'Optimum settings for automatic controllers', Trans ASME, 64(8), 759-768.
