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Performance Enhancement of Piezoelectric Energy Harvesters Using Multilayer and Multistep Beam Configurations

Sriramdas, Rammohan and Chiplunkar, Sanketh and Cuduvally, Ramya M and Pratap, Rudra (2015) Performance Enhancement of Piezoelectric Energy Harvesters Using Multilayer and Multistep Beam Configurations. In: IEEE SENSORS JOURNAL, 15 (6). pp. 3338-3348.

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Official URL: http://dx.doi.org/10.1109/JSEN.2014.2387882


Low-power requirements of contemporary sensing technology attract research on alternate power sources that can replace batteries. Energy harvesters absorb ambient energy and function as power sources for sensors and other low-power devices. Piezoelectric bimorphs have been demonstrating the preeminence in converting the mechanical energy in ambient vibrations into electrical energy. Improving the performance of these harvesters is pivotal as the energy in ambient vibrations is innately low. In this paper, we focus on enhancing the performance of piezoelectric harvesters through a multilayer and, in particular, a multistep configuration. Partial coverage of piezoelectric material in steps along the length of a cantilever beam results in a multistep piezoelectric energy harvester. We also discuss obtaining an approximate deformation curve for the beam with multiple steps in a computationally efficient manner. We find that the power generated by a multistep beam is almost 90% more than that by a multilayer harvester made out of the same volume of polyvinylidinefluoride ( PVDF), further corroborated experimentally. Improvements observed in the power generated prove to be a boon for weakly coupled low profile piezoelectric materials. Thus, in spite of the weak piezoelectric coupling observed in PVDF, its energy harvesting capability can be improved significantly using it in a multistep piezoelectric beam configuration.

Item Type: Journal Article
Additional Information: Copy right for this article belongs to the IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC, 445 HOES LANE, PISCATAWAY, NJ 08855-4141 USA
Keywords: Energy harvesting; multilayer beam; multistep beam; piezoelectric coupling; PVDF harvesters
Department/Centre: Division of Mechanical Sciences > Mechanical Engineering
Division of Interdisciplinary Sciences > Centre for Nano Science and Engineering
Date Deposited: 29 May 2015 05:34
Last Modified: 29 May 2015 05:34
URI: http://eprints.iisc.ac.in/id/eprint/51597

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