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Journal of Vibration Testing and System Dynamics 2(1) (2018) 1--8 | DOI:10.5890/JVTSD.2018.03.001

Amine Bichri$^{1}$, Jarir Mahfoud$^{2}$, Mohamed Belhaq$^{3}$

$^{1}$ Faculty of Science and Technology-Errachidia, Errachidia, Morocco

$^{2}$ INSA-Lyon, LaMCoS UMR5259, Lyon, France

$^{3}$ University Hassan II-Casablanca, Casablanca, Morocco

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Abstract

The effects of combined DC and fast AC electromagnetic actuations on the dynamic behavior of an excited cantilever beam is studied considering a single mode approximation. Analytical investigation is performed to extract the equation of motion describing the slow dynamic of the system. The influence of the fast AC actuation and the air gap on the nonlinear behavior of the system is examined. It is shown that the nonlinear characteristic of the system can be controlled by appropriately tuning the AC actuation or the air gap. This can be useful in certain engineering applications where the operating frequency range includes one or several critical frequencies that should be avoided.

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