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Vol. 192, Issue 9, September 2015, pp. 37-43




Experimental and Modelling Study of a Piezoelectric Energy Harvester
Unimorph Cantilever Arrays

Almuatasim Alomari and Ashok Batra

Department of Physics, Chemistry and Mathematics (Materials Science Group) College of Engineering, Technology,
and Physical Sciences Alabama A&M University Normal, Alabama 35762 USA

Received: 8 August 2015 /Accepted: 10 September 2015 /Published: 30 September 2015

Digital Sensors and Sensor Sysstems


Abstract: The electrical output parameters and mode shapes of multiple piezoelectric unimorph cantilever beams (UCBs) with same thickness and different length reported and examined. Connecting arrays of 5 commercial unimorph beams made of polyvinylidene difluoride (PVDF) in series showed widening in the bandwidth and increasing in the power magnitude of energy harvester comparing to single unimorph beam. The output power was increased from 2 W to 5 W and the bandwidth was widened from (47, 55) Hz to (22, 88) Hz. Finite element analysis (FEA) was used to investigate about the first fifth mode shapes of the suggested system using COMSOL multi-physics, with a good agreement between model and experiment.


Keywords: Piezoelectric, Unimorph, PVDF, Mode shapes, Modelling, FEA, COMSOL.


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