15 March 2018 Internal resonance of T-shaped structure for energy harvesting with magnetic nonlinearity
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This paper describes the finite element modeling and experimental testing of a magnetic T-shaped piezoelectric energy harvester that activates the internal resonance phenomena to increase voltage output and frequency bandwidth. The harvester consists of two magnets and two coupled beams, a cantilever piezoelectric beam attached to a clamped-clamped beam. A finite-element model is used to obtain the global mode shapes and natural frequencies of the system. We controlled the distance between the two magnets to achieve a nonlinear phenomenon of internal resonance of the structure, where the 2:1 ratio is satisfied between the modal natural frequencies. The T-shaped structure is combined with the magnetic nonlinearity such that a large, distinct internal resonance can occur at much lower excitation levels compared to a T-shaped structure without magnetic nonlinearity. Presented experimental results validate the benefits of the T-shaped structure nonlinearity when combined with a magnetic nonlinearity to achieve higher bandwidth and large responses, which can improve the energy conversion efficiency of the vibration energy harvester.
Conference Presentation
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Alwathiqbellah Ibrahim, Alwathiqbellah Ibrahim, Wei Yang, Wei Yang, Shahrzad Towfighian, Shahrzad Towfighian, } "Internal resonance of T-shaped structure for energy harvesting with magnetic nonlinearity", Proc. SPIE 10595, Active and Passive Smart Structures and Integrated Systems XII, 105952E (15 March 2018); doi: 10.1117/12.2302518; https://doi.org/10.1117/12.2302518

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