Prog. Theor. Phys. Vol. 73 No. 3 (1985) pp. 638-648
Random Frequency Modulation of a Forced Nonlinear Oscillator
Research Institute for Fundamental Physics, Kyoto University, Kyoto 606
(Received August 25, 1984)
A phase model of a randomly frequency-modulated limit cycle oscillator with external periodic force is studied. Our numerical analysis reveals the following: (1) The spectrum always shows an infinitely sharp peak at the external frequency; (2) for sufficiently slow modulation, a marked intensity drop occurs near the central peak; (3) for sufficiently fast modulation, this spectral dip disappears and at the same time the line component comes to share a dominant part of the total intensity. These features are interpreted qualitatively.
DOI : 10.1143/PTP.73.638
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