Abstract
In this paper, the authors analysed a cycling phenomenon in an actual control system. As a result of some experiments we came to the conclusion that this phenomenon was caused by a backlash element in the pneumatic controller. Carrying out the analysis of the control system including this nonlinear characteristic by the use of the gain-phase plane, it was found that the cycling frequency and amplitude were in good agreement with the experimental results. The larger the sensitivity of the proportional action controller is, the larger the frequency and the amplitude of the cycling.
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