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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

Holography System PRISM: (a) set-up picture; (b) operation scheme.
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sensors-15-12594-f018: Holography System PRISM: (a) set-up picture; (b) operation scheme.

Mentions: A Precise Real-Time Instrument for Surface Measurement (PRISM) holography system (Hytec, Los Alamos, NM, USA), presented in Figure 18, was used for the determination and oscillation analysis of the cantilever resonant frequency. The PRISM allows completing and processing experimental measurements in less than 5 min as well as is capable of determining displacements of less than 20 nm [16].


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)

Holography System PRISM: (a) set-up picture; (b) operation scheme.
© Copyright Policy
Related In: Results  -  Collection

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

sensors-15-12594-f018: Holography System PRISM: (a) set-up picture; (b) operation scheme.
Mentions: A Precise Real-Time Instrument for Surface Measurement (PRISM) holography system (Hytec, Los Alamos, NM, USA), presented in Figure 18, was used for the determination and oscillation analysis of the cantilever resonant frequency. The PRISM allows completing and processing experimental measurements in less than 5 min as well as is capable of determining displacements of less than 20 nm [16].

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