Abstract
This work entails an analysis of secondary resonances in the parametrically damped van der Pol equation, with and without external excitation. A potential application of this system is a vertical-axis wind-turbine blade, which can have cyclic damping, aeroelastic self-excitation, and direct excitation. We analyze the system using the method of multiple scales and numerical solutions. For the case without external excitation, the analysis reveals nonresonant phase drift (quasiperiodic responses) and subharmonic resonance with possible phase drift or phase locking (periodic responses). The case of external excitation consists of a constant load and a harmonic load with the same frequency as the parametric term. Hard excitation is treated for nonresonant conditions and secondary resonances. Subharmonic and superharmonic resonances show possible phase drift and phase locking. Primary resonance is observed but not analyzed here.
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The datasets generated during and/or analyzed during the current study are available from the corresponding author on reasonable request.
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This work is based on a project supported by the National Science Foundation, under grant CMMI-1435126. Any opinions, findings, and conclusions or recommendations expressed in this material are those of the author(s) and do not necessarily reflect the views of the National Science Foundation.
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Afzali, F., Kharazmi, E. & Feeny, B.F. Resonances of a forced van der Pol equation with parametric damping. Nonlinear Dyn 111, 5269–5285 (2023). https://doi.org/10.1007/s11071-022-08026-w
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DOI: https://doi.org/10.1007/s11071-022-08026-w