Use of Angularity on Piezoelectric Crystal to Create Frequency Phase Shift for a Wide-Band Energy Harvester
Written by Sohrab MirzaAbedini
Abstract
Purpose
Piezoelectric materials, when positioned angularly with respect to their crystallographic axis, exhibit a fascinating phenomenon: the creation of a frequency phase shift (FPS) during resonance. Traditionally, FPS arises due to changes in shape and material properties, causing the resonance frequency point to shift. However, present research has revealed an unexplored avenue: when a piezoelectric crystal vibrates along an axis that deviates from the normal poling axis, it manifests FPS phenomena. This unique behavior can be harnessed for a wide-bandwidth energy harvester—a novel application that has not been investigated by other researchers.
Methods
Rather than delving into the theoretical nature of FPS, this study focuses on practical implementation of this phenomenon. Clear mathematical assumptions, coupled with experimental validation, confirm the significant impact of angular position on piezoelectric crystals. Overall, 3 methods of mathematical modeling (with explicit formulas in the appendix), experimental setup and finite element method (FEM) have been used in this study.
Results and Conclusions
The results from all the three methods for solving flexural motion demonstrate how power output depends on the angular position of the model and the dimensional variations of the beam and the piezoelectric material. The newly designed energy harvester produces 5 μWatt of power in both analytical and experimental approaches, under an acceleration of
. Operating within a 20 Hz bandwidth for half-power level and utilizing two perpendicular beams, this design ensures that power output remains nonzero regardless of changes in the assembly’s direction of excitation.
you can access this research by following the link below:
Use of Angularity on Piezoelectric Crystal to Create Frequency Phase Shift for a Wide-Band Energy Harvester
DOI:
https://doi.org/10.1007/s42417-024-01355-7
If you have any question regarding this research you can reach out to me through this website's contact form.
You can Also access the open access of this reseach following this link:
Analysis of angular position, dimension and material of a cantilever piezoelectric energy harvester
Written by Sohrab MirzaAbedini
Abstract
The performance of an angular vibrating single piezoelectric cantilever beam energy harvester in a flexural mode was analyzed. In this research the approaches of theory, finite element, and experiment have been undertaken to study the effects of angular position, mechanical properties, and dimensions on the output power and resonance frequency of a piezoelectric cantilever beam. The phase shift is an important phenomenon observed in this system because of the angular position of the beam about its longitudinal axis. Frequency shift due to the angular position is usually observed in experiments. However, it has not been studied theoretically until now. The angular position not only affects the resonance frequency but also the amount of output power from the lead zirconate titanate ceramic bonded on it. Furthermore, beam and piezoelectric dimensions have a major effect on power output and resonance frequency. Another aspect considered in this research is the effect of materials on power and frequency which have been studied for aluminum, copper, and steel.
links to the paper
https://doi.org/10.1080/00150193.2018.1528940
request a free full text here:
to cite this paper:
download the citations or the full text from here: downloads
or access it through: