Journal
JOURNAL OF INTELLIGENT MATERIAL SYSTEMS AND STRUCTURES
Volume 28, Issue 3, Pages 323-338Publisher
SAGE PUBLICATIONS LTD
DOI: 10.1177/1045389X16642302
Keywords
piezoelectric energy harvesting; multi-directional energy harvesting; 1:2 internal resonance; energy interchange; dynamic magnifier
Categories
Funding
- NSF [CMMI-1130724]
- Directorate For Engineering
- Div Of Civil, Mechanical, & Manufact Inn [1130724] Funding Source: National Science Foundation
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Piezoelectric cantilevers are widely used in vibration energy harvesting. Simple cantilever-based harvesters are mostly unidirectional. In this article, we develop a cantilever-pendulum system that can harvest vibratory energy of excitations from an arbitrary direction. The new design consists of a traditional piezoelectric cantilever with a pendulum attached to the tip. It is shown analytically and experimentally that with proper parametric combination this system can induce modal energy interchange between beam vibration and pendulum motions due to 1:2 internal resonance, which ultimately yields multi-directional energy harvesting by a single cantilever. The underlying mechanisms of this design are analyzed in detail.
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