A new design to improve bandwidth of piezoelectric energy harvester
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This study proposed a unique wideband energy harvester with a spiral metal plate design which has the potential to harvest vibrational energy over a broad range of ambient frequencies. In this design, metal shim with various length was integrated with piezoceramic rings in a spiral form as the cochlea. Spiral form metal shims with various radius leaves were integrated with piezoelectric ceramic. Each metal leaves has its resonance frequency that is slightly different than its neighboring ones. Parametric studies such as split structure, the radius of the metal shim, brass thickness, and tip mass and clamped area were performed to investigate the energy harvester structure. From the results, the buzzer form energy harvesting unit is designed to split leaf form, resonance frequency shifts to lower frequency. In split structure design for various leaf radius, every leaf keeps their resonance frequencies. This designed structure was resonated on the broader frequency range. Radius difference for neighbor leaves provided wider effective energy harvesting frequency range. Thicker brass shim led to higher stress on piezoelectric ceramic, more significant peak to peak output voltage at own resonance frequency.
KeywordsEnergy harvesting Cochlea resonance frequency Piezoelectric Spiral design Vibration
The authors thank Görkem Hatipoğlu, Ali Bıyıklı, Nebehat Bıyıklı (Nanotech Co.), Hasan Yavuz (Haser Co.), Şevket Tekin (3G Design), and Emre Tüfekçioğlu for their valuable support.
This work was financially supported by The Scientific And Technological Research Council of Turkey (TUBITAK) project number 110M328, Turkish Armed Forces Foundation Company (ASELSAN), Anadolu University Research Project with the number of 1103F068, and Ministry of Turkey Science, Industry and Technology with project number 1436-STZ-2012-1 by the program of SANTEZ.
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