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arXiv · 2003.03838

Amplitude hysteresis and the synchronization region: Prediction of vortex-induced vibration using a freely forced van der Pol oscillator

Øyvind Mortveit Ellingsen·Xavier Amandolese
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Abstract

Vortex-induced vibration is a nonlinear phenomenon that can damage buildings or produce energy. Here, the range of synchronization between fluid and structure is an important parameter. Using a coupled van der Pol and linear oscillator system, we derived an analytic, closed-form expression for the synchronization range as a function of fluid shedding frequency, or lock-in as it's also called. Our new definition is an improvement to an earlier synchronization definition as it includes the effect of dissipation; without it hysteresis is missing. The fluid speed range with hysteresis is found to be non-monotonic with forcing strength while the region of absolute synchronization increases monotonically. Our proposed synchronization definition can be a useful tool when designing structural dampers or energy harvesters but is a general solution for all systems that can be modeled with similarly coupled equations.

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Øyvind Mortveit Ellingsen, Xavier Amandolese. 2020-03-08. Amplitude hysteresis and the synchronization region: Prediction of vortex-induced vibration using a freely forced van der Pol oscillator. https://arxiv.org/abs/2003.03838

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