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Taming chaos by weak harmonic perturbations has been a hot topic in recent years. This paper clarifies the mechanism for taming chaos theoretically. The model we consider in this paper is a forced Rayleigh oscillator with a diode. To simplify analyses, we consider the degenerate case, where the diode in the circuit operates as a switch. In this case, the governing equation of the circuit is represented by a constrained equation, and the Poincar\'e map is derived rigorously as a one-dimensional map. By the analysis of the Poincar\'e map, we clarify that taming chaos occurs by a saddle-node bifurcation.
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Tamura et al. (1999) studied this question.
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