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Sensors  2014 

Efficiency Enhancement of a Cantilever-Based Vibration Energy Harvester

DOI: 10.3390/s140100188

Keywords: energy harvesting, TPMS, piezoceramic, vibration, harmonic excitation energy, damping, FEA

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Abstract:

Extracting energy from ambient vibration to power wireless sensor nodes has been an attractive area of research, particularly in the automotive monitoring field. This article reports the design, analysis and testing of a vibration energy harvesting device based on a miniature asymmetric air-spaced cantilever. The developed design offers high power density, and delivers electric power that is sufficient to support most wireless sensor nodes for structural health monitoring (SHM) applications. The optimized design underwent three evolutionary steps, starting from a simple cantilever design, going through an air-spaced cantilever, and ending up with an optimized air-spaced geometry with boosted power density level. Finite Element Analysis (FEA) was used as an initial tool to compare the three geometries’ stiffness (K), output open-circuit voltage (V ave), and average normal strain in the piezoelectric transducer (ε ave) that directly affect its output voltage. Experimental tests were also carried out in order to examine the energy harvesting level in each of the three designs. The experimental results show how to boost the power output level in a thin air-spaced cantilever beam for energy within the same space envelope. The developed thin air-spaced cantilever (8.37 cm 3), has a maximum power output of 2.05 mW (H = 29.29 μJ/cycle).

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