Investigation of the dynamic behavior of slender beams coupled by magnetic forces

Resumo

© "Advances in Acoustics, Noise and Vibration - 2021" Proceedings of the 27th International Congress on Sound and Vibration, ICSV 2021. All rights reserved.Over the last decades, the development of novel permanent magnets, especially those having rare earth metals in their composition, has led to a great improvement in their performance, as compared to conventional ferrite permanent magnets. Therefore, there has been an increasing demand for these magnets in many (including new) application fields. In particular, the strong magnetic forces exerted between magnets can be explored as a means of promoting contactless mechanical coupling between separate parts and structural components. In this context, this paper investigates the dynamic behavior of a multiphysics system composed of two parallel cantilever beams at the extremity of which cubic permanent magnets are attached. Given the nonlinear nature of the magnetic forces, the main interest is to characterize the dynamic phenomena induced by the magnetic coupling. The study also encompasses analyses of the influence of the gaps between the two magnets and the relative orientation of their polarization axes. For this purpose, an elasto-magnetic structural model is developed, accounting for the flexibility and mass distributions of the beams and also the magnetic interactions. Upon resolution of the equations of motion, this model is used to perform a number of numerical simulations, the results of which are presented and discussed.

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