The Experts below are selected from a list of 45 Experts worldwide ranked by ideXlab platform
Lei Zuo - One of the best experts on this subject based on the ideXlab platform.
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An efficient vibration energy harvester with a multi-mode Dynamic Magnifier
Smart Materials and Structures, 2012Co-Authors: Wanlu Zhou, Gopinath Reddy Penamalli, Lei ZuoAbstract:A novel piezoelectric energy harvester with a multi-mode Dynamic Magnifier, which is capable of significantly increasing the bandwidth and the energy harvested from the ambient vibration, is proposed and investigated in this paper. The design comprises a multi-mode intermediate beam with a tip mass, called a ‘Dynamic Magnifier’, and an ‘energy harvesting beam’ with a tip mass. The piezoelectric film is adhered to the harvesting beam to harvest the vibration energy. By properly designing the parameters, such as the length, width and thickness of the two beams and the weight of the two tip masses, we can magnify the motion virtually in all the resonance frequencies of the energy harvesting beam, in a similar way as designing a new beam-type tuned mass damper (TMD) to damp the resonance frequencies of all the modes of the primary beam. Theoretical analysis, finite element simulation, and the experiment study are carried out. The results show that voltage produced by the harvesting beam is amplified for efficient energy harvesting over a broader frequency range, while the peaks of the first three modes of the primary beam can be effectively mitigated simultaneously. The experiment demonstrates 25.5 times more energy harvesting capacity than the conventional cantilever type harvester in the frequency range 3–300 Hz, and 100–1000 times more energy around all the first three resonances of the harvesting beam.
Wanlu Zhou - One of the best experts on this subject based on the ideXlab platform.
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An efficient vibration energy harvester with a multi-mode Dynamic Magnifier
Smart Materials and Structures, 2012Co-Authors: Wanlu Zhou, Gopinath Reddy Penamalli, Lei ZuoAbstract:A novel piezoelectric energy harvester with a multi-mode Dynamic Magnifier, which is capable of significantly increasing the bandwidth and the energy harvested from the ambient vibration, is proposed and investigated in this paper. The design comprises a multi-mode intermediate beam with a tip mass, called a ‘Dynamic Magnifier’, and an ‘energy harvesting beam’ with a tip mass. The piezoelectric film is adhered to the harvesting beam to harvest the vibration energy. By properly designing the parameters, such as the length, width and thickness of the two beams and the weight of the two tip masses, we can magnify the motion virtually in all the resonance frequencies of the energy harvesting beam, in a similar way as designing a new beam-type tuned mass damper (TMD) to damp the resonance frequencies of all the modes of the primary beam. Theoretical analysis, finite element simulation, and the experiment study are carried out. The results show that voltage produced by the harvesting beam is amplified for efficient energy harvesting over a broader frequency range, while the peaks of the first three modes of the primary beam can be effectively mitigated simultaneously. The experiment demonstrates 25.5 times more energy harvesting capacity than the conventional cantilever type harvester in the frequency range 3–300 Hz, and 100–1000 times more energy around all the first three resonances of the harvesting beam.
Gopinath Reddy Penamalli - One of the best experts on this subject based on the ideXlab platform.
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An efficient vibration energy harvester with a multi-mode Dynamic Magnifier
Smart Materials and Structures, 2012Co-Authors: Wanlu Zhou, Gopinath Reddy Penamalli, Lei ZuoAbstract:A novel piezoelectric energy harvester with a multi-mode Dynamic Magnifier, which is capable of significantly increasing the bandwidth and the energy harvested from the ambient vibration, is proposed and investigated in this paper. The design comprises a multi-mode intermediate beam with a tip mass, called a ‘Dynamic Magnifier’, and an ‘energy harvesting beam’ with a tip mass. The piezoelectric film is adhered to the harvesting beam to harvest the vibration energy. By properly designing the parameters, such as the length, width and thickness of the two beams and the weight of the two tip masses, we can magnify the motion virtually in all the resonance frequencies of the energy harvesting beam, in a similar way as designing a new beam-type tuned mass damper (TMD) to damp the resonance frequencies of all the modes of the primary beam. Theoretical analysis, finite element simulation, and the experiment study are carried out. The results show that voltage produced by the harvesting beam is amplified for efficient energy harvesting over a broader frequency range, while the peaks of the first three modes of the primary beam can be effectively mitigated simultaneously. The experiment demonstrates 25.5 times more energy harvesting capacity than the conventional cantilever type harvester in the frequency range 3–300 Hz, and 100–1000 times more energy around all the first three resonances of the harvesting beam.
Jae Yeong Park - One of the best experts on this subject based on the ideXlab platform.
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low frequency vibration energy harvester using stopper engaged Dynamic Magnifier for increased power and wide bandwidth
Journal of Electrical Engineering & Technology, 2016Co-Authors: Miah A Halim, Dae Heum Kim, Jae Yeong ParkAbstract:We present a piezoelectric energy harvester with stopper-engaged Dynamic Magnifier which is capable of significantly increasing the operating bandwidth and the energy (power) harvested from a broad range of low frequency vibrations (<30 Hz). It uses a mass-loaded polymer beam (primary spring-mass system) that works as a Dynamic Magnifier for another mass-loaded piezoelectric beam (secondary spring-mass system) clamped on primary mass, constituting a two-degree-of-freedom (2-DOF) system. Use of polymer (polycarbonate) as the primary beam allows the harvester not only to respond to low frequency vibrations but also generates high impulsive force while the primary mass engages the base stopper. Upon excitation, the Dynamic Magnifier causes mechanical impact on the base stopper and transfers a secondary shock (in the form of impulsive force) to the energy harvesting element resulting in an increased strain in it and triggers nonlinear frequency up-conversion mechanism. Therefore, it generates almost four times larger average power and exhibits over 250% wider half-power bandwidth than those of its conventional 2-DOF counterpart (without stopper). Experimental results indicate that the proposed device is highly applicable to vibration energy harvesting in automobiles.
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piezoceramic based wideband energy harvester using impact enhanced Dynamic Magnifier for low frequency vibration
Ceramics International, 2015Co-Authors: Miah A Halim, Jae Yeong ParkAbstract:Piezoceramic materials (such as PZT) have excellent piezoelectric properties and have been extensively used in vibration energy harvesting. Conventional piezoceramic-based energy harvesters (SDOF systems) are only efficient near their 1st resonance, and their 2nd resonance is generally ignored due to the higher frequency and comparatively lower response level. A properly designed Dynamic Magnifier can be used in a 2-DOF system to increase the effective bandwidth of the device by reducing the frequency gap between the 1st and 2nd resonances. The output is therefore improved by increasing the strain produced in the piezoelectric cantilever. Nevertheless, such a device cannot effectively harvest energy from vibrations at a frequency below 30 Hz. We present a piezoceramic-based wideband low-frequency vibration energy harvester that exploits the mechanical impact of the mass of a flexible Dynamic Magnifier on a harvester base stopper. This mechanical impact delivers a large secondary force to a piezoceramic cantilevered secondary beam, resulting in an increased strain and also triggering a non-linear frequency up-conversion mechanism that increases both the output power and the bandwidth of the operating frequency. A prototype energy harvester with a mass ratio of μ=5.8 and a stopper distance of d=0.5 mm generated a peak power with a maximum of 449 μW delivered to an optimal load of 30 kΩ at a frequency of 17 Hz, and the half-power bandwidth was found to be 15 Hz (from 9 Hz to 24 Hz) at 1 g of acceleration, indicating that the device is capable of efficiently harvesting energy from a broad range of low-frequency random vibrations as well as shocks.
Francois Costa - One of the best experts on this subject based on the ideXlab platform.
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modeling of piezoelectric energy harvester with multi mode Dynamic Magnifier with matrix representation
International Journal of Applied Electromagnetics and Mechanics, 2013Co-Authors: Dejan Vasic, Francois CostaAbstract:A piezoelectric energy harvester with a multi-mode Dynamic Magnifier is proposed and modeled in this paper. The Dynamic Magnifier consists of an intermediate beam with a tip mass, which is placed between the fixed end of the energy harvesting beam and the vibrating base structure. The piezoelectric element is bounded to the harvesting beam to harvest the vibration energy. With proper choice of the design parameters of the Magnifier, the harvested electric power can be significantly increased due to the bandwidth extension, which enables energy harvesting from the ambient vibration in a larger range of frequency. Theoretical analysis is carried out with 4 × 4 chain matrix representation. Numerical examples are presented to illustrate the merits of the Dynamic Magnifier in comparison with the conventional piezoelectric energy harvesters. The results show that electric power produced by the harvesting beam is amplified for efficient energy harvesting over a broader frequency range.
