DocumentCode :
1427780
Title :
Digital adaptive control system employing a normalised performance index
Author :
Nightingale, J.M.
Volume :
111
Issue :
1
fYear :
1964
fDate :
1/1/1964 12:00:00 AM
Firstpage :
165
Lastpage :
172
Abstract :
An analysis is presented of a sampled-data parameter-adaptive control system. The accuracy in the region of optimum is seen to be adversely affected by fluctuations in the measured performance index owing to short-term smoothing. A normalised performance index is proposed to reduce these fluctuations. This index is largely insensitive to fluctuations in the control-system input. Its use also ensures that the gain of the parameter-adjusting loop does not depend on the amplitude of the control-system input. The parameter-adjusting loop, a stepping system, is incorporated in a digital computer. Provision is made for a dead space in the parameter loop to reduce the likelihood of false steps near the optimum parameter setting. A steady-state solution of the parameter loop equations indicates the dependence of parameter loop accuracy on step length, dead space and the variance of the performance-index fluctuation.
Keywords :
automatic control; computer applications;
fLanguage :
English
Journal_Title :
Electrical Engineers, Proceedings of the Institution of
Publisher :
iet
ISSN :
0020-3270
Type :
jour
DOI :
10.1049/piee.1964.0027
Filename :
5250270
Link To Document :
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