DocumentCode :
859705
Title :
A study of asynchronously excited oscillations in nonlinear control systems
Author :
Elgerd, Olle I.
Author_Institution :
University of Florida, Gainesville, FL, USA
Volume :
5
Issue :
3
fYear :
1960
fDate :
8/1/1960 12:00:00 AM
Firstpage :
179
Lastpage :
192
Abstract :
This study was initiated as an effort to explain certain oscillatory phenomena observed in an aircraft and weapon control system operated in a particular mode. The oscillations in question were of the undamped limit-cycle type and their presence could very clearly be correlated with the degree of noise corruption of the signals. It is demonstrated in this paper that certain types of nonlinear systems although being inherently stable may be driven into oscillatory modes not only by random signals but also by any high frequency periodic or nonperiodic signal possessing a certain energy content. It is of interest to note that the tendency for hunting and also the hunt frequency usually are completely independent of the frequency of the excitation signal, i.e., the phenomenon is of asynchronous nature. A general theory, the validity of which has been tested by both analog and digital means, is presented and utilized to demonstrate how this phenomenon may be predicted from information on circuit data.
Keywords :
Aerospace engineering; Aircraft; Circuit testing; Control systems; Frequency; Limit-cycles; Linear systems; Nonlinear control systems; Nonlinear systems; Servomechanisms;
fLanguage :
English
Journal_Title :
Automatic Control, IRE Transactions on
Publisher :
ieee
ISSN :
0096-199X
Type :
jour
DOI :
10.1109/TAC.1960.1105013
Filename :
1105013
Link To Document :
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