10 April 2013 Shear mode energy harvesting of piezoelectric sandwich beam
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Piezoelectric materials due to their high electromechanical coupling properties are good candidates for energy harvesting applications by transforming mechanical energy to electrical power. The piezoelectric coupling coefficient of each material is dependent on its operating mode and higher coupling coefficient means higher efficiency in energy harvesting. In most of the piezoelectric materials, the d15 piezoelectric strain coefficient is the highest coefficient compared to the d33 and d31 coefficients. However complicated fabrication and evaluation of energy harvesting devices operating in the shear mode has slow down the research in this area. The shear piezoelectric effect can be induced during the steady state response of a thick cantilever composite beam due to the effect of shear force through the thickness. Here, a model based on the Timoshenko beam theory is developed to estimate the electric power output in a cantilever beam with a piezoelectric core subjected to the base excitation. The governing electromechanical equations as well as the output voltage and power frequency responses are derived for the piezoelectric sandwich beam. This model is applicable to different geometries and piezoelectric compositions in order to design an optimal shear energy harvester. At the end, the performance of this type of shear energy harvesters is compared to the typical cantilever bimorph energy harvesting beams with the same piezoelectric volume.
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Mohammad H. Malakooti, Mohammad H. Malakooti, Henry A. Sodano, Henry A. Sodano, } "Shear mode energy harvesting of piezoelectric sandwich beam", Proc. SPIE 8688, Active and Passive Smart Structures and Integrated Systems 2013, 86881R (10 April 2013); doi: 10.1117/12.2009883; https://doi.org/10.1117/12.2009883

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