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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

Amplitude-frequency response characteristics for the optimally configured cantilever without the support and with support located at x/l~0.78 and x/l~0.87.
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sensors-15-12594-f017: Amplitude-frequency response characteristics for the optimally configured cantilever without the support and with support located at x/l~0.78 and x/l~0.87.

Mentions: Next, amplitude-frequency characteristics for the optimally configured cantilever (Figure 17) were obtained. For the unsupported cantilever the first resonant frequency was registered at 58 Hz, the second at 396 Hz and the third one at 1336 Hz (the vibration amplitude of the first resonance was the highest for the unsupported cantilever). In case of the support introduced at x/l = 0.78, the second resonance was noted at 395 Hz and the third at 1249 Hz (the amplitude of the second resonance was the highest). As the support was shifted to x/l = 0.87, the second resonance was registered at 350 Hz, the third at 1325 Hz. A natural cantilever clamp resonance was registered again (at ~126 Hz) and excluded from further investigation.


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)

Amplitude-frequency response characteristics for the optimally configured cantilever without the support and with support located at x/l~0.78 and x/l~0.87.
© Copyright Policy
Related In: Results  -  Collection

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

sensors-15-12594-f017: Amplitude-frequency response characteristics for the optimally configured cantilever without the support and with support located at x/l~0.78 and x/l~0.87.
Mentions: Next, amplitude-frequency characteristics for the optimally configured cantilever (Figure 17) were obtained. For the unsupported cantilever the first resonant frequency was registered at 58 Hz, the second at 396 Hz and the third one at 1336 Hz (the vibration amplitude of the first resonance was the highest for the unsupported cantilever). In case of the support introduced at x/l = 0.78, the second resonance was noted at 395 Hz and the third at 1249 Hz (the amplitude of the second resonance was the highest). As the support was shifted to x/l = 0.87, the second resonance was registered at 350 Hz, the third at 1325 Hz. A natural cantilever clamp resonance was registered again (at ~126 Hz) and excluded from further investigation.

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