Abstract
A multimodal vibration energy harvesting in a periodic system is proposed. The multimodal approach and the nonlinearity are implemented in order to improve the performances of the studied device. The periodic system, based on electromagnetic transduction, consists of two weakly coupled magnets mechanically guided by two elastic beams. The quasi-periodic system is obtained by varying the mass of one of the moving magnets which leads to the vibration energy localization in regions close to the imperfections. This phenomenon is exploited to maximize the harvested energy. The mechanical nonlinearity is introduced by considering large displacements of the beams. The system is modeled by two coupled forced Duffing equations. The governing equations are solved using finite difference method combined with arc-length method. It is shown that the introduction of the nonlinearity leads to the enlargement of the bandwidth and the increase of the amplitude of the vibration.
Highlights
Over the past few years, the diversity of ambient sources of energy arouses researchers to make its scavenging a major challenge [1]
Various techniques based on different conversion mechanisms have been developed [2]. The evolution in this domain is continuous, most devices operate on a narrow frequency band, which limits their application in areas where energy prevails over a large frequency band [1, 3]
The frequency responses of the two dofs are obtained by solving the system of equations using the finite difference method
Summary
It is composed of two weakly coupled magnets guided by elastic beams. Copper coils are wrapped around the moving magnets. A current is induced in coils when magnets oscillate around their equilibrium positions (Lenz’ low). This current will be exploited to harvest energy
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