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11 April 2017 Bandwidth improvement by a novel piece-wise generator design with extended nonlinearities
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Incorporating nonlinearities into the structures is extensively studied as an effective approach to increase the operation band of the vibration generators. Two well-known ways of obtaining nonlinearities are utilizing magnetic interaction or pre-stress effect, which brings considerable complexities for modeling and design, thus hindering the applications of the nonlinear approach. The piece-wise generator presents a simple realization of nonlinearities with good robustness. However, the available nonlinearities are limited to the combination of two linear segments of stiffness, which restricts the performance of the harvesting device. In this paper, a new piece-wise generator is proposed with more possible nonlinearities realization while keeping the advantages of simplicity and robustness. A prolonged curve fixture is introduced instead of the stopper configuration in the normal piece-wise generator, making the stiffness nonlinearity with more choice by selecting different curves of the fixture. Experimental and theoretical results show that the proposed generator possesses much better performance than the regular piece-wise generator with effectively enhanced bandwidth and resembled peak power.
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Weiqun Liu, Congzhi Liu, Qiao Zhu, Bingyu Ren, and Guangdi Hu "Bandwidth improvement by a novel piece-wise generator design with extended nonlinearities", Proc. SPIE 10164, Active and Passive Smart Structures and Integrated Systems 2017, 101642S (11 April 2017);

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