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• W2074429249 abstract "The inefficiency in converting low frequency vibration (6~240 Hz) to electrical energy remains a key issue for miniaturized vibration energy harvesting devices. To address this subject, this paper reports on the novel, three-dimensional micro-fabrication of spring elements within such devices, in order to achieve resonances and maximum energy conversion within these common frequencies. The process, known as projection microstereolithography, is exploited to fabricate polymer-based springs direct from computer-aided designs using digital masks and ultraviolet-curable resins. Using this process, a micro-spring structure is fabricated consisting of a two-by-two array of three-dimensional, constant-pitch helical coils made from 1,6-hexanediol diacrylate. Integrating the spring structure into an electromagnetic device, with a magnetic load mass of 1.236 grams, the resonance is measured at 61 Hz, which is within 2% of the theoretical model. The device provides a maximum normalized power output of 9.14 μW/G (<mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML><mml:mi>G</mml:mi><mml:mo>=</mml:mo><mml:mn>9.81</mml:mn></mml:math> ms −2 ) and an open circuit normalized voltage output of 621 mV/G. To the best of the authors knowledge, notable features of this work include the lowest Young’s modulus (530 MPa), density (1.011 g/cm 3 ), and “largest feature size” (3.4 mm) for a spring element in a vibration energy harvesting device with sub-100 Hz resonance." @default.
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• W2074429249 date "2012-05-21" @default.
• W2074429249 modified "2023-10-16" @default.
• W2074429249 title "Microstereolithography of Three-Dimensional Polymeric Springs for Vibration Energy Harvesting" @default.
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• W2074429249 doi "https://doi.org/10.1155/2012/741835" @default.
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