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Peculiarities of the third natural frequency vibrations of a cantilever for the improvement of energy harvesting.

Ostasevicius V, Janusas G, Milasauskaite I, Zilys M, Kizauskiene L - Sensors (Basel) (2015)

Bottom Line: The results of this research revealed that the voltage generated by any segment of the segmented PVEH prototype excited at the third resonant frequency demonstrated a 3.4-4.8-fold increase in comparison with the non-segmented prototype.Simultaneously, the efficiency of the energy harvester prototype also increased at lower resonant frequencies from 16% to 90%.The insights presented in the paper may serve for the development and fabrication of advanced piezoelectric energy harvesters which would be able to generate a considerably increased amount of electrical energy independently of the frequency of kinematical excitation.

View Article: PubMed Central - PubMed

Affiliation: Institute of Mechatronics, Kaunas University of Technology, Studentu 56-123, Kaunas LT-51368, Lithuania. vytautas.ostasevicius@ktu.lt.

ABSTRACT
This paper focuses on several aspects extending the dynamical efficiency of a cantilever beam vibrating in the third mode. A few ways of producing this mode stimulation, namely vibro-impact or forced excitation, as well as its application for energy harvesting devices are proposed. The paper presents numerical and experimental analyses of novel structural dynamics effects along with an optimal configuration of the cantilever beam. The peculiarities of a cantilever beam vibrating in the third mode are related to the significant increase of the level of deformations capable of extracting significant additional amounts of energy compared to the conventional harvester vibrating in the first mode. Two types of a piezoelectric vibrating energy harvester (PVEH) prototype are analysed in this paper: the first one without electrode segmentation, while the second is segmented using electrode segmentation at the strain nodes of the third vibration mode to achieve effective operation at the third resonant frequency. The results of this research revealed that the voltage generated by any segment of the segmented PVEH prototype excited at the third resonant frequency demonstrated a 3.4-4.8-fold increase in comparison with the non-segmented prototype. Simultaneously, the efficiency of the energy harvester prototype also increased at lower resonant frequencies from 16% to 90%. The insights presented in the paper may serve for the development and fabrication of advanced piezoelectric energy harvesters which would be able to generate a considerably increased amount of electrical energy independently of the frequency of kinematical excitation.

No MeSH data available.


Related in: MedlinePlus

Deformed shape (a) and von Misses stress distribution (b) for the third vibration mode of the energy harvester prototype.
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sensors-15-12594-f002: Deformed shape (a) and von Misses stress distribution (b) for the third vibration mode of the energy harvester prototype.

Mentions: Simulation results are presented in Figure 2. It shows the deformed shape and von Misses stress distribution in the third vibration mode of the PVEH prototype. As has been mentioned in the introductory part, charge cancelation in piezoelectric materials does not appear in the first vibration mode (strain distribution function does not change the sign when the harvester is operating at its first natural frequency), thus higher vibration in the third vibration mode (Figure 2a). As the von Misses stress distribution plot in Figure 2b suggests, the simulated locations of the strain nodes in the third vibration mode are 6 mm and 19 mm from the clamping point, respectively.


Peculiarities of the third natural frequency vibrations of a cantilever for the improvement of energy harvesting.

Ostasevicius V, Janusas G, Milasauskaite I, Zilys M, Kizauskiene L - Sensors (Basel) (2015)

Deformed shape (a) and von Misses stress distribution (b) for the third vibration mode of the energy harvester prototype.
© Copyright Policy
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC4507603&req=5

sensors-15-12594-f002: Deformed shape (a) and von Misses stress distribution (b) for the third vibration mode of the energy harvester prototype.
Mentions: Simulation results are presented in Figure 2. It shows the deformed shape and von Misses stress distribution in the third vibration mode of the PVEH prototype. As has been mentioned in the introductory part, charge cancelation in piezoelectric materials does not appear in the first vibration mode (strain distribution function does not change the sign when the harvester is operating at its first natural frequency), thus higher vibration in the third vibration mode (Figure 2a). As the von Misses stress distribution plot in Figure 2b suggests, the simulated locations of the strain nodes in the third vibration mode are 6 mm and 19 mm from the clamping point, respectively.

Bottom Line: The results of this research revealed that the voltage generated by any segment of the segmented PVEH prototype excited at the third resonant frequency demonstrated a 3.4-4.8-fold increase in comparison with the non-segmented prototype.Simultaneously, the efficiency of the energy harvester prototype also increased at lower resonant frequencies from 16% to 90%.The insights presented in the paper may serve for the development and fabrication of advanced piezoelectric energy harvesters which would be able to generate a considerably increased amount of electrical energy independently of the frequency of kinematical excitation.

View Article: PubMed Central - PubMed

Affiliation: Institute of Mechatronics, Kaunas University of Technology, Studentu 56-123, Kaunas LT-51368, Lithuania. vytautas.ostasevicius@ktu.lt.

ABSTRACT
This paper focuses on several aspects extending the dynamical efficiency of a cantilever beam vibrating in the third mode. A few ways of producing this mode stimulation, namely vibro-impact or forced excitation, as well as its application for energy harvesting devices are proposed. The paper presents numerical and experimental analyses of novel structural dynamics effects along with an optimal configuration of the cantilever beam. The peculiarities of a cantilever beam vibrating in the third mode are related to the significant increase of the level of deformations capable of extracting significant additional amounts of energy compared to the conventional harvester vibrating in the first mode. Two types of a piezoelectric vibrating energy harvester (PVEH) prototype are analysed in this paper: the first one without electrode segmentation, while the second is segmented using electrode segmentation at the strain nodes of the third vibration mode to achieve effective operation at the third resonant frequency. The results of this research revealed that the voltage generated by any segment of the segmented PVEH prototype excited at the third resonant frequency demonstrated a 3.4-4.8-fold increase in comparison with the non-segmented prototype. Simultaneously, the efficiency of the energy harvester prototype also increased at lower resonant frequencies from 16% to 90%. The insights presented in the paper may serve for the development and fabrication of advanced piezoelectric energy harvesters which would be able to generate a considerably increased amount of electrical energy independently of the frequency of kinematical excitation.

No MeSH data available.


Related in: MedlinePlus