scholarly journals Output of MEMS Piezoelectric Energy Harvester of Double-Clamped Beams with Different Width Shapes

Materials ◽  
2020 ◽  
Vol 13 (10) ◽  
pp. 2330 ◽  
Author(s):  
Lei Jin ◽  
Shiqiao Gao ◽  
Xiyang Zhang ◽  
Qinghe Wu
Keyword(s):  
Theoretical Analysis ◽  
Energy Harvester ◽  
Experimental Results ◽  
Beam Shape ◽  
Microelectromechanical System ◽  
Micro Scale ◽  
Piezoelectric Energy ◽  
Clamped Beams ◽  
Different Shapes ◽  
Good Agreement

For a microelectromechanical system (MEMS) piezoelectric energy harvester consisting of double-clamped beams, the effects of both beam shape and electrode arrangement on the voltage outputs are analyzed. For two kinds of harvester structures including millimeter-scale and micro-scale, and different shapes including rectangular, segmentally trapezoidal and concave parabolic are taken into account. Corresponding electric outputs are calculated and tested. Their results are in good agreement with each other. The experimental results validate the theoretical analysis.

PHOTOINDUCED NONLINEAR OCTUPOLAR POLARIZATION: TRANSIENT AND PERMANENT REGIMES

1996 ◽  
Vol 05 (04) ◽  
pp. 653-670 ◽  
Author(s):  
CÉLINE FIORINI ◽  
JEAN-MICHEL NUNZI ◽  
FABRICE CHARRA ◽  
IFOR D.W. SAMUEL ◽  
JOSEPH ZYSS
Keyword(s):  
Theoretical Analysis ◽  
Second Harmonic ◽  
Experimental Results ◽  
Polar Field ◽  
Rotational Spectrum ◽  
Dual Frequency ◽  
One Dimensional ◽  
Ethyl Violet ◽  
Disperse Red 1 ◽  
Good Agreement

An original poling method using purely optical means and based on a dual-frequency interference process is presented. We show that the coherent superposition of two beams at fundamental and second-harmonic frequencies results in a polar field with an irreducible rotational spectrum containing both a vector and an octupolar component. This enables the method to be applied even to molecules without a permanent dipole such as octupolar molecules. After a theoretical analysis of the process, we describe different experiments aiming at light-induced noncentrosymmetry performed respectively on one-dimensional Disperse Red 1 and octupolar Ethyl Violet molecules. Macroscopic octupolar patterning of the induced order is demonstrated in both transient and permanent regimes. Experimental results show good agreement with theory.

scholarly journals A Multi-Mode Broadband Vibration Energy Harvester Composed of Symmetrically Distributed U-Shaped Cantilever Beams

Micromachines ◽  
2021 ◽  
Vol 12 (2) ◽  
pp. 203
Author(s):  
Xiaohua Huang ◽  
Cheng Zhang ◽  
Keren Dai
Keyword(s):  
Energy Harvester ◽  
Low Frequency ◽  
Experimental Results ◽  
Vibration Energy ◽  
Cantilever Beams ◽  
Resonant Frequencies ◽  
Promising Alternative ◽  
Piezoelectric Energy ◽  
Straight Beam ◽  
Resonance Frequencies

Using the piezoelectric effect to harvest energy from surrounding vibrations is a promising alternative solution for powering small electronic devices such as wireless sensors and portable devices. A conventional piezoelectric energy harvester (PEH) can only efficiently collect energy within a small range around the resonance frequency. To realize broadband vibration energy harvesting, the idea of multiple-degrees-of-freedom (DOF) PEH to realize multiple resonant frequencies within a certain range has been recently proposed and some preliminary research has validated its feasibility. Therefore, this paper proposed a multi-DOF wideband PEH based on the frequency interval shortening mechanism to realize five resonance frequencies close enough to each other. The PEH consists of five tip masses, two U-shaped cantilever beams and a straight beam, and tuning of the resonance frequencies is realized by specific parameter design. The electrical characteristics of the PEH are analyzed by simulation and experiment, validating that the PEH can effectively expand the operating bandwidth and collect vibration energy in the low frequency. Experimental results show that the PEH has five low-frequency resonant frequencies, which are 13, 15, 18, 21 and 24 Hz; under the action of 0.5 g acceleration, the maximum output power is 52.2, 49.4, 61.3, 39.2 and 32.1 μW, respectively. In view of the difference between the simulation and the experimental results, this paper conducted an error analysis and revealed that the material parameters and parasitic capacitance are important factors that affect the simulation results. Based on the analysis, the simulation is improved for better agreement with experiments.

The Separation of Light Gaseous Isotopes by Mass Diffusion Columns II

1964 ◽  
Vol 19 (6) ◽  
pp. 747-755
Author(s):  
W. J. De Wet ◽  
J. Los
Keyword(s):  
Theoretical Analysis ◽  
Mass Diffusion ◽  
Experimental Results ◽  
The Other ◽  
Countercurrent Flow ◽  
Gas Solubility ◽  
Flow Rates ◽  
Mixing Effects ◽  
Other Hand ◽  
Good Agreement

The design of mass diffusion columns operated with partition membranes, for the separation of light gaseous isotopes, is discussed. A theoretical analysis of experimental results obtained indicates that a good agreement between experimental results and theory is only obtained at low column pressures and moderate countercurrent flow rates. At fairly low countercurrent flow rates mixing effects due to viscous dragging and gas solubility by the condensate appear to be considerable whereas excessively high countercurrent flow rates, on the other hand, also seem undesirable. Some suggestions are proposed to obviate impairing effects at least to some extent.

Cumulative Fatigue Damage Under Stress-Controlled Conditions

1971 ◽  
Vol 93 (4) ◽  
pp. 691-698 ◽  
Author(s):  
Thang Bui Quoc ◽  
J. Dubuc ◽  
A. Bazergui ◽  
A. Biron
Keyword(s):  
Theoretical Analysis ◽  
Fatigue Damage ◽  
Experimental Results ◽  
Published Data ◽  
Mean Stress ◽  
Remaining Life ◽  
Random Loading ◽  
Controlled Conditions ◽  
Cumulative Fatigue Damage ◽  
Good Agreement

A theoretical analysis of uniaxial cumulative fatigue damage is presented together with a large number of experimental results on unnotched specimens of A-201 and A-517 steels. The theory developed permits the prediction of fatigue curves for stress-controlled conditions with zero or positive mean stress as well as the evaluation of the damage accumulated during a fatigue test and hence the prediction of the remaining life of a specimen. Theory is in good agreement with the experimental results as well as with published data on other materials. The development may be extended to other types of tests such as strain-controlled or random loading conditions.

scholarly journals Fabrication and characterization of a piezoelectric energy harvester with clamped-clamped beams

AIP Advances ◽  
2018 ◽  
Vol 8 (5) ◽  
pp. 055028 ◽  
Author(s):  
Yan Cui ◽  
Menglin Yu ◽  
Shiqiao Gao ◽  
Xiangxin Kong ◽  
Wang Gu ◽  
...  
Keyword(s):  
Energy Harvester ◽  
Piezoelectric Energy ◽  
Clamped Beams ◽  
Fabrication And Characterization

A Microstrip Stepped-Impedance Resonator Bandpass Filter Based on Inductive Coupling

Frequenz ◽  
2019 ◽  
Vol 73 (1-2) ◽  
pp. 7-11
Author(s):  
X. C. Zhang ◽  
X. Chen ◽  
L. Sun ◽  
Y. S. Huang ◽  
X. F. Gao
Keyword(s):  
Theoretical Analysis ◽  
Bandpass Filter ◽  
Higher Order ◽  
Experimental Results ◽  
Inductive Coupling ◽  
Successful Design ◽  
Stepped Impedance Resonator ◽  
Good Agreement

Abstract A simple and successful design for a microstrip stepped-impedance resonator (SIR) bandpass filter (BPF) based on inductive coupling is presented. It is well known that SIRs are used to shift or suppress the higher order frequencies. In order to achieve compact circuit size, a perceptual stepped-impedance resonator is utilized. Based on theoretical analysis, this resonator can shift the spurious frequency to 3.8f0. The experimental results show good agreement with theory and simulations.

Effects of changing the M2+ cation on the crystal structure and optical properties of divalent samarium-doped MAl2Si2O8 (M = Ca, Sr, Ba)

RSC Advances ◽  
2015 ◽  
Vol 5 (25) ◽  
pp. 19734-19742 ◽  
Author(s):  
Ling Li ◽  
Xiaoguang Liu
Keyword(s):  
Crystal Structure ◽  
Optical Properties ◽  
Theoretical Analysis ◽  
Experimental Results ◽  
Photoluminescence Properties ◽  
Good Agreement

The photoluminescence properties and theoretical analysis of Sm2+ doped MAl2Si2O8 (M = Ca, Sr, Ba) were reported. The theoretical analysis is in good agreement with our experimental results.

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