ADJUSTING THE RESONANT FREQUENCY OF A CANTILEVER PIEZOELECTRIC HARVESTER
Journal Title: Jurnalul Stiintific TURBO - Year 2018, Vol 5, Issue 2
Abstract
The paper presents the methods employed for adjusting the resonant frequency of a piezoelectric harvester in cantilever construction, in order to meet the resonance condition with the vibration source. Operating at resonance is the foremost requirement for obtaining maximum electrical response. A sharp voltage peak occurs at that frequency, significant electric power being obtained in a tight frequency range. The frequency can be changed in various ways, such as: modifying the length subjected to vibrations by changing clamp position, using a more elastic or stiffer fastening, adding a proof mass, electric loads, etc. The aim of this work is to modify the fundamental frequency of the piezoelectric transducer so as to match the frequency of the test vibrating engine measured at ~190 Hz. A FEM simulation has been realized in COMSOL Multiphysics, to have an idea beforehand of what we can expect. The experimental tests have shown a close similitude with the simulation results, thus validating the finite element method model. The desired frequency was eventually obtained, the structure resonating with source vibrations.
Authors and Affiliations
Claudia BORZEA, Daniel Comeaga
Keywords
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