Journal
COMMUNICATIONS IN NONLINEAR SCIENCE AND NUMERICAL SIMULATION
Volume 55, Issue -, Pages 146-156Publisher
ELSEVIER
DOI: 10.1016/j.cnsns.2017.05.027
Keywords
Nonlinear string vibration; Mathieu-Duffing equation; Parametric resonance; Jump phenomenon
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In this paper, vibrations of thin stretched strings carrying an alternating electric current in a non-uniform magnetic field are described by nonlinear equations. Within the frame of a simplified model, we studied the combined effect of geometric nonlinearity and Joule heating acting opposite to each other. An equation including Joule heating only shows unlimited growth in oscillation amplitude near resonant frequencies. Nevertheless, a single mode approximation resulting in Mathieu-Duffing ' s equation shows a double resonance with bounded oscillation amplitude. At zero external force, the response frequency of steady-state oscillations is equal to parametric modulation frequency in an interval near the resonant frequency; otherwise, the response frequency equals the natural frequency of the oscillator. (C) 2017ElsevierB. V. Allrightsreserved.
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