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Appl. Sci. 2018, 8(4), 557; https://doi.org/10.3390/app8040557

Development of Piezoelectric Harvesters with Integrated Trimming Devices

Department of Industrial Engineering, University of Padova, 35131 Padova, Italy
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Received: 12 March 2018 / Revised: 2 April 2018 / Accepted: 2 April 2018 / Published: 4 April 2018
(This article belongs to the Special Issue Piezoelectric Energy Harvesting: Materials, Devices and Application)
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Abstract

Piezoelectric cantilever harvesters have a large power output at their natural frequency, but in some applications the frequency of ambient vibrations is different from the harvester’s frequency and/or ambient vibrations are periodic with some harmonic components. To cope with these operating conditions harvesters with integrated trimming devices (ITDs) are proposed. Some prototypes are developed with the aid of an analytical model and tested with an impulsive method. Results show that a small trimming device can lower the main resonance frequency of a piezoelectric harvester of the same extent as a larger tip mass and, moreover, it generates at high frequency a second resonance peak. A multi-physics numerical finite element (FE) model is developed for predicting the generated power and for performing a stress-strain analysis of harvesters with ITDs. The numerical model is validated on the basis of the experimental results. Several configurations of ITDs are conceived and studied. Numerical results show that the harvesters with ITDs are able to generate relevant power at two frequencies, owing to the particular shape of the modes of vibration. The stress in the harvesters with ITDs is smaller than the stress in the harvester with a tip mass trimmed to the same frequency. View Full-Text
Keywords: harvester; piezoelectric; dynamic vibration absorber; trimming harvester; piezoelectric; dynamic vibration absorber; trimming
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).
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MDPI and ACS Style

Doria, A.; Medè, C.; Fanti, G.; Desideri, D.; Maschio, A.; Moro, F. Development of Piezoelectric Harvesters with Integrated Trimming Devices. Appl. Sci. 2018, 8, 557.

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