A.P. Loh, L.H. Lim, J. Fu, and K.F. Fong (Singapore)
relay feedback, forced and subharmonic oscillations
This paper examines the behaviour of a single loop relay feedback system (RFS) in the presence of an external forcing sinusoid. It is well known that such a closed loop system sometimes undergo a forced oscillation (FO) phe nomenon while at other times, subharmornic oscillations (SO) may be observed. This paper examines the conditions under which each of these can occur.
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