Preprint Article Version 1 This version is not peer-reviewed

Development of Piezoelectric Harvesters with Integrated Tuning Devices

Version 1 : Received: 17 January 2018 / Approved: 17 January 2018 / Online: 17 January 2018 (12:41:48 CET)

How to cite: Doria, A.; Medè, C.; Fanti, G.; Desideri, D.; Maschio, A.; Moro, F. Development of Piezoelectric Harvesters with Integrated Tuning Devices. Preprints 2018, 2018010159 (doi: 10.20944/preprints201801.0159.v1). Doria, A.; Medè, C.; Fanti, G.; Desideri, D.; Maschio, A.; Moro, F. Development of Piezoelectric Harvesters with Integrated Tuning Devices. Preprints 2018, 2018010159 (doi: 10.20944/preprints201801.0159.v1).

Abstract

The possibility of improving the performance of a piezoelectric harvester by means of novel tuning devices integrated with the harvester’s structure is investigated. Some prototypes of harvesters with tuning devices are developed by mounting cantilever dynamic absorbers on standard harvesters. A mathematical model is used for predicting the natural frequencies of the coupled system. Tests on prototypes are carried out with an impulsive method. Experimental results show that a small tuning device can lower the main resonance frequency of a piezoelectric harvester of the same extent as a larger tip mass and moreover generates at high frequency a second resonance peak. A multi-physics numerical model is developed for predicting the generated power and for performing stress-strain analysis of harvesters equipped with Integrated Tuning Devices (ITDs). The numerical model is validated on the basis of experimental results. Several configurations of ITDs are conceived and studied. Numerical results show that 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 tuned to the same frequency.

Subject Areas

harvester; piezoelectric; dynamic vibration absorber; tuning

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