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In this paper, we demonstrate a novel robust miniature three-axis vibrational energy-harvester using a mechanical-piezoelectric configuration. Using the configuration, the harvester employs Newton’s law of inertia and the piezoelectric effect to convert either the $x$ -axis or $y$ -axis in-plane and $z$ -axis out-of-plane ambient vibrations into piezoelectric voltage-responses. Under the $x$ -axis...
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