Limits...
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

Dependence of the cantilever rebound amplitudes ymax on the support position x/l at fixed time moments T after rebound.
© Copyright Policy
Related In: Results  -  Collection

License
getmorefigures.php?uid=PMC4507603&req=5

sensors-15-12594-f010: Dependence of the cantilever rebound amplitudes ymax on the support position x/l at fixed time moments T after rebound.

Mentions: The position of the immovable support could be changed by shifting it in the direction of the cantilever axis. By placing the immovable support in certain fixed positions, related to the nodal point positions of the higher vibration modes of the cantilever, the amplitudes of these vibration modes can be markedly increased. Figure 10 presents the cantilever vibration momentum T curves after a collision with the support in the third mode nodal point x/l = 0.87, where x is the distance of the support from the fixed end of the cantilever and l is the length of the cantilever.


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)

Dependence of the cantilever rebound amplitudes ymax on the support position x/l at fixed time moments T after rebound.
© Copyright Policy
Related In: Results  -  Collection

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

sensors-15-12594-f010: Dependence of the cantilever rebound amplitudes ymax on the support position x/l at fixed time moments T after rebound.
Mentions: The position of the immovable support could be changed by shifting it in the direction of the cantilever axis. By placing the immovable support in certain fixed positions, related to the nodal point positions of the higher vibration modes of the cantilever, the amplitudes of these vibration modes can be markedly increased. Figure 10 presents the cantilever vibration momentum T curves after a collision with the support in the third mode nodal point x/l = 0.87, where x is the distance of the support from the fixed end of the cantilever and l is the length of the cantilever.

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