Journal
SENSORS AND ACTUATORS A-PHYSICAL
Volume 188, Issue -, Pages 427-433Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.sna.2012.03.026
Keywords
Energy harvesting; Shell structure; Fabric; Wearable platform; Biomechanical energy; Human motion
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This paper discusses a flexible energy harvester that consists of a polyvinylidene fluoride film attached to a curved substrate in a shell shape for harvesting energy from human motion. The proposed harvester effectively converts mechanical energy into electrical energy during the fast state transition of the shell structure. The results of an experiment demonstrated that shell structures with various curvatures produce high output potential and consequently offer high output power in comparison to a simple flat structure. The single shell structure generates an output power of 0.87 mW at a folding angle of 80 degrees and a folding and unfolding frequency of 3.3 Hz. In addition, fabric with embedded piezoelectric shell structures was designed as an energy harvester in a wearable platform. The fabric, worn on the elbow joints and fingers, generates a high output power of 0.21 mW in spite of slow and irregular motion. (C) 2012 Elsevier B.V. All rights reserved.
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