Enhanced energy harvesting performance of the piezoelectric unimorph with perpendicular electrodes

2014 ◽  
Vol 105 (4) ◽  
pp. 043905 ◽  
Author(s):  
Ming Ma ◽  
Song Xia ◽  
Zhenrong Li ◽  
Zhuo Xu ◽  
Xi Yao
Keyword(s):  
Energy Harvesting ◽  
Piezoelectric Unimorph

Optimization of a piezoelectric unimorph for shock and impact energy harvesting

2007 ◽  
Vol 16 (4) ◽  
pp. 1125-1135 ◽  
Author(s):  
Michael Renaud ◽  
Paolo Fiorini ◽  
Chris van Hoof
Keyword(s):  
Energy Harvesting ◽  
Impact Energy ◽  
Piezoelectric Unimorph

Investigation of Energy Harvest Using a Piezoelectric Unimorph Post-Buckled by a Stretching Spring

2014 ◽  
Vol 613 ◽  
pp. 193-199
Author(s):  
Sheng Fu Sun ◽  
Wei Jie Dong ◽  
Yan Cui
Keyword(s):  
Energy Harvesting ◽  
Output Power ◽  
Elastic Energy ◽  
High Efficiency ◽  
Piezoelectric Materials ◽  
Initial Energy ◽  
Open Circuit ◽  
Energy Harvest ◽  
Standard Device ◽  
Piezoelectric Unimorph

Pre-stressed piezoelectric unimorphs show enhanced actuation displacements and high efficiency of energy harvesting compared with conventional unimorphs. A method to increase the amount of stored energy by injecting elastic energy to energy harvesting system consisting of the THUNDER device is described in this paper. A stretching spring is mounted on the two tabs of THUNDER device in order to inject energy to the system. The mechanical stress applied on THUNDER device results in an increase in the initial stored mechanical and elastic energy, which contribute to the improved response of the modified device. In experiment, two different springs were added on the THUNDER device: one's initial length is 17mm with k=45N/m and another is 33mm with k=145N/m. For the THUNDER device with a spring of k=145N/m and a proof mass of 8.2g, the maximum open circuit VRMS was 29.4V, and output power of 4.53mW was obtained by a load resistor of 90 kΩ at vibration frequency of 51Hz. Compared with standard device, the energy density or the output power at resonance frequency increased by 74.4%. The displacement performance of the modified devices was larger than that of the standard device. Through measurements and analysis, after a stretching spring was attached to the THUNDER device, dielectric constant did not change obviously, while d31 increased a lot. We can conclude that the improvement of energy harvesting is mainly due to the increase of d31 and stress distribution in the THUNDER device. Furthermore, the use of an initial energy injection mechanism based on a nonlinear approach can artificially enhance the conversion abilities of piezoelectric materials.

Increasing Energy-harvesting ability of piezoelectric unimorph cantilevers using Spring Supports

2016 ◽  
Vol 68 (11) ◽  
pp. 1262-1266 ◽  
Author(s):  
Kyung Bum Kim ◽  
San Nahm ◽  
Tae Hyun Sung ◽  
Jong Hoo Paik ◽  
Hyoung Jae Kim
Keyword(s):  
Energy Harvesting ◽  
Piezoelectric Unimorph

Modelling and analysis of a piezoelectric unimorph cantilever for energy harvesting application

2020 ◽  
Vol 35 (9-10) ◽  
pp. 675-681 ◽  
Author(s):  
Qingping Wang ◽  
Wei Dai ◽  
Sha Li ◽  
Jin An Sam Oh ◽  
Tian Wu
Keyword(s):  
Energy Harvesting ◽  
Unimorph Cantilever ◽  
Piezoelectric Unimorph

Analysis of magneto rheological elastomers for energy harvesting systems

2020 ◽  
Vol 64 (1-4) ◽  
pp. 439-446
Author(s):  
Gildas Diguet ◽  
Gael Sebald ◽  
Masami Nakano ◽  
Mickaël Lallart ◽  
Jean-Yves Cavaillé
Keyword(s):  
Magnetic Field ◽  
Energy Harvesting ◽  
Shear Strain ◽  
Magnetic Induction ◽  
Magnetic Particles ◽  
Homogeneous Magnetic Field ◽  
Electrical Signal ◽  
Harvesting Systems ◽  
Dc Bias ◽  
Magneto Rheological

Magneto Rheological Elastomers (MREs) are composite materials based on an elastomer filled by magnetic particles. Anisotropic MRE can be easily manufactured by curing the material under homogeneous magnetic field which creates column of particles. The magnetic and elastic properties are actually coupled making these MREs suitable for energy conversion. From these remarkable properties, an energy harvesting device is considered through the application of a DC bias magnetic induction on two MREs as a metal piece is applying an AC shear strain on them. Such strain therefore changes the permeabilities of the elastomers, hence generating an AC magnetic induction which can be converted into AC electrical signal with the help of a coil. The device is simulated with a Finite Element Method software to examine the effect of the MRE parameters, the DC bias magnetic induction and applied shear strain (amplitude and frequency) on the resulting electrical signal.

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