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Hier finden Sie wissenschaftliche Publikationen aus den FraunhoferInstituten. A Nonlinear Broadband Electromagnetic Vibration Energy Harvester Based on DoubleClamped Beam
 Energies 12 (2019), Nr.14, Art.2710, 12 S. ISSN: 19961073 

 Englisch 
 Zeitschriftenaufsatz, Elektronische Publikation 
 Fraunhofer ENAS () 
Abstract
The performance of vibration energy harvesters is usually restricted by their frequency bandwidth. The doubleclamped beam with strong natural nonlinearity is a simple way that can effectively expand the frequency bandwidth of the vibration energy harvester. In this article, a nonlinear electromagnetic vibration energy harvester with monostable doubleclamped beam was proposed. A systematic analysis was conducted and a distributed parameter analytical model was established. On this basis, the output performance was estimated by the analytical model. It was found that the nonlinearity of the doubleclamped beam had little influence on the maximum output, while broadening the frequency bandwidth. In addition, the resonant frequency, the frequency bandwidth, and the maximum output all increased following the increase of excitation level. Furthermore, the resonant frequency varies with the load changes, due to the electromagnetic damping, so the maximum output power should be gained at its optimum load and frequency. To experimentally verify the established analytical model, an electromagnetic vibration energy harvester demonstrator was built. The prediction by the analytical model was confirmed by the experiment. As a result, the opencircuit voltage, the average power and the frequency bandwidth of the electromagnetic vibration energy harvester can reach up to 3.6 V, 1.78 mW, and 11 Hz, respectively, under only 1 G acceleration, which shows a prospect for the application of the electromagnetic vibration energy harvester based on a doubleclamped beam.