Abstract
Energy harvesting using piezoelectric devices has received considerable attention in the past few years. The most commonly used devices have been cantilevered bimorphs with a large proof mass attached to it. The goal of this paper is to discuss the effects of varying geometry to enhance the average strain through a material via shape optimization into triangular type geometries from a quantitative point of view, while studying the internal strain energy and the stress distribution over the surface when a cantilevered device is loaded. When a triangular cantilever is compared to a rectangular counterpart with the same volume, the stress over its surface is linear, as it has a more constant radius of curvature, and its loading capacity effectively doubles. These concepts are explored numerically using ANSYS. The concept of internal strain energy per unit area over the length span of the beam is used to evaluate the amount of average energy stored in the material over the surface, and shows that regardless of geometry, the value is strictly a function of volume of the device. The linear stress distribution over the length of triangular beams, and their relations with the volume when compared to a rectangular cantilever is the standout property that would allow much more reliable operation of cantilevered brittle piezoelectric ceramic devices.
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References
Sodano HA, Inman DJ, Park G (2004) A review of power harvesting from vibration using piezoelectric materials. The Shock Vib Dig 36:197–205
Cook-Chennault KA, Thambi N, Sastry AM (2008) Powering MEMS portable devices – a review of non-regenerative and regenerative power supply systems with special emphasis on piezoelectric energy harvesting systems. Smart Mater Struct 17:043001
Priya S (2007) Advances in energy harvesting using low profile piezoelectric transducers. J Electroceram 19:167–184
Beeby SP, Tudor MJ, White NM (2006) Energy harvesting vibration sources for microsystems applications. Meas Sci Technol 17:R175–R195
Roundy S, Wright PK, Rabaey J (2003) A study of low level vibrations as a power source for wireless sensor nodes. Comput Commun 26:1131–1144
Roundy S, Wright PK, Rabaey JM (2004) Energy scavenging for wireless sensor networks: with special focus on vibrations. Kluwer, Boston
Ikeda TO (1990) Fundamentals of piezoelectricity. Oxford University Press, New York
Roundy S, Leland ES, Baker J, Carleton E, Reilly E, Lai E, Otis B, Rabaey JM, Wright PK, Sundararajan V (2005) Improving power output for vibration-based energy scavengers. Pervas Comput IEEE 4:28–36
Goldschmidtboeing F, Woias P (2008) Characterization of different beam shapes for piezoelectric energy harvesting. J Micromech Microeng 18:104013
Benasciutti D, Moro L, Zelenika S, Brusa E (2009) Vibration energy scavenging via piezoelectric bimorphs of optimized shapes. Microsyst Technol 16:657–668
Park JH, Kang J, Ahn H, Kim SB, Liu D, Kim DJ (2010) Analysis of stress distribution in piezoelectric MEMS energy harvester using shaped cantilever structure. Ferroelectrics 409:55–61
Paquin S, St-Amant Y (2010) Improving the performance of a piezoelectric energy harvester using a variable thickness beam. Smart Mater Struct 19:105020
Park J, Lee S, Kwak BM (2012) Design optimization of piezoelectric energy harvester subject to tip excitation. J Mech Sci Technol 26:137–143
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© 2014 The Society for Experimental Mechanics
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Siddiqui, N.A., Kim, SB., Kim, DJ., Overfelt, R.A., Prorok, B.C. (2014). Shape Optimization of Cantilevered Piezoelectric Devices. In: Shaw III, G., Prorok, B., Starman, L., Furlong, C. (eds) MEMS and Nanotechnology, Volume 5. Conference Proceedings of the Society for Experimental Mechanics Series. Springer, Cham. https://doi.org/10.1007/978-3-319-00780-9_5
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DOI: https://doi.org/10.1007/978-3-319-00780-9_5
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