EXPERIMENTAL DETERMINATION OF OPEN-LOOP FREQUENCY RESPONSE CHARACTERISTICS OF DLG-6 CLASS STEAM GENERATOR SYSTEM
1963
Banham, J. W. | Zavod, P. H.
Open loop frequency response measurements were made of the elements comprising the DLG-6 Class main boiler and its several controls. Bode diagrams were curve fitted and the approximate transfer functions obtained in mathematical form. Results were analyzed both for agreement of open loop transfer functions with continuity of energy and mass theory, and for closed loop conformance with stability criteria. Data indicated that steam boiler systems do not lend themselves readily to high performance control, principally due to large phase lags inherent in the process at low frequencies. The chief offenders in this regard are the forced draft blowers, the heat sink, and the additional integrations in the controllers themselves.
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