Finite Element Analysis of Lead-Free Ceramic Based Cymbal Transducer for Energy Harvesting

Biologically inspired droplet interface bilayers have found applications in the development of hair cell sensors and other mechanotransduction applications. In this research, the flexoelectric capability of the droplet bilayers under external excitation is explored for energy harvesting. Traditionally, membrane capacitance models are being used for inferring the magnitude of the membrane deflection which do not account for the relation between the applied force or deflection and the deflection of the interfacial membrane and time dependent variations. In this work, the dynamic behavior of the droplets under external excitation has been modeled using nonlinear finite element analysis. A flexoelectric model including mechanical, electrical, and chemical sensitivities has been developed and coupled with the calculated bilayer deformations to predict the mechanotransductive response of the droplets under excitation. Using the developed framework, the possibilities of energy harvesting for different droplet configurations have been investigated and reported.

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Adhesion Strength of BNT Films Hydrothermally Deposited on Titanium Substrates

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.123-125.399 ◽

2010 ◽

Vol 123-125 ◽

pp. 399-402

Author(s):

Fang Chao Xu ◽

Kazuhiro Kusukawa

Keyword(s):

Finite Element Analysis ◽

Finite Element ◽

Adhesion Strength ◽

Pure Titanium ◽

Tensile Tests ◽

Film Deposition ◽

Lead Free ◽

Element Analysis ◽

Substrate Strain ◽

Titanium Substrates

Lead-free piezoelectric (Bi1/2Na1/2)TiO3 (BNT) films were deposited on 1 mm thick pure titanium(Ti) substrates by a hydrothermal method. Tensile tests were performed to quantitatively assess the adhesion strength between BNT films and Ti substrates. Ti substrates were pretreated by chemical polish and mechanical polish respectively prior to BNT film deposition. In the tensile test, the behavior of BNT film exfoliation was investigated by the replica method. The critical Ti substrate strain inducing BNT film exfoliation was determined by the aid of finite element analysis (FEM). In this study, the results revealed that BNT film exfoliations were caused by the strain of Ti substrate, and the mechanical polish pretreatment improved the adhesion of BNT film to Ti substrate.

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Development of a hybrid vibration converter for real vibration source / Entwicklung eines Hybrid-Vibrationswandlers für eine echte Schwingungsquelle

tm - Technisches Messen ◽

10.1515/teme-2019-0050 ◽

2019 ◽

Vol 86 (s1) ◽

pp. 57-61 ◽

Cited By ~ 1

Author(s):

Sonia Bradai ◽

Slim Naifar ◽

Olfa Kanoun

Keyword(s):

Magnetic Field ◽

Finite Element Analysis ◽

Finite Element ◽

Energy Harvesting ◽

Resonant Frequency ◽

Ambient Vibration ◽

Vibration Source ◽

Frequency Bandwidth ◽

Element Analysis ◽

The Magnetic Field

AbstractHarvesting energy from ambient vibration sources is challenging due to its low characteristic amplitude and frequencies. In this purpose, this work presents a compact hybrid vibration converter based on electromagnetic and magnetoelectric principles working for a frequency bandwidth and under real vibration source properties. The combination of especially these two principles is mainly due to the fact that both converters can use the same changes of the magnetic field for energy harvesting. The converter was investigated using finite element analysis and validated experimentally. Results have shown that a frequency bandwidth up to 12 Hz with a characteristic resonant frequency at 24 Hz and a power density of 0.11mW/cm3 can be reached.

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