The Characteristic Analysis of a Piezoelectric Actuator for Valveless Micropumps

2006 ◽  
Vol 326-328 ◽  
pp. 1511-1514
Author(s):  
Sung Hyuk Lee ◽  
Seok Heo ◽  
Cheol Woong Kim ◽  
Kwang Joon Yoon
Keyword(s):  
Theoretical Model ◽  
Piezoelectric Actuator ◽  
Bonding Layer ◽  
Finite Element Analyses ◽  
Characteristic Analysis ◽  
Design And Optimization ◽  
Simulation Based ◽  
Piezoelectric Disk ◽  
Theoretical Results ◽  
Good Agreement

The behavior of a circular piezoelectric actuator for volumetric micropump has been investigated by using theoretical and finite element analyses. A modified theoretical model was developed to predict the behavior of a piezoelectric actuator induced by the applied voltage. The theoretical results for the diaphragm deflection were in good agreement with the results from numerical simulation. Based on the theoretical analysis, the effects of several important parameters on actuation performance have been investigated. These parameters include the dimensions and mechanical properties of the piezoelectric disk, bonding layer and elastic diaphragm materials. Consequently, it is thought that above theoretical model might be employed as a tool for design and optimization of the piezoelectric actuator for micropump application.

Thermocouple Response Characteristics in Deflagrating Low-Conductivity Materials

1971 ◽  
Vol 93 (1) ◽  
pp. 77-84 ◽  
Author(s):  
Nam P. Suh ◽  
C. L. Tsai
Keyword(s):  
Theoretical Model ◽  
Gas Phase ◽  
Wire Diameter ◽  
Solid Propellants ◽  
Optimum Ratio ◽  
Response Characteristics ◽  
Bead Diameter ◽  
Double Base ◽  
Theoretical Results ◽  
Good Agreement

The transient thermocouple response characteristics in deflagrating low-conductivity materials with high temperature gradients were investigated theoretically and experimentally. The theoretical model considers the thermocouple bead and lead wires separately, and the two resulting partial differential equations are solved simultaneously by a finite difference technique. The experimental results are obtained by embedding various size thermocouple wires in double-base solid propellants and consequently measuring the temperature profiles and the surface temperatures. The theoretical model is used to predict the experimentally measured temperatures. There is good agreement. The experimentally measured values are smaller than the correct surface temperature, corresponding to the model prediction for zero wire diameter, by at least 20 percent even when 1/2-mil thermocouple wire is used. Both the experimental and theoretical results show a plateau when the thermocouple bead emerges from the solid into the gas phase. The theoretical results also show that there is an optimum ratio of. the thermocouple bead diameter to the wire diameter, which is found to be close to three

TWO- AND THREE-PHOTON NONLINEAR ABSORPTION IN As2Se3 CHALCOGENIDE GLASS: THEORY AND EXPERIMENT

2004 ◽  
Vol 13 (01) ◽  
pp. 7-16 ◽  
Author(s):  
F. SANCHEZ ◽  
G. BOUDEBS ◽  
S. CHERUKULAPPURATH ◽  
H. LEBLOND ◽  
J. TROLES ◽  
...  
Keyword(s):  
Photon Absorption ◽  
Nonlinear Material ◽  
Closed Form Expression ◽  
Two Photon Absorption ◽  
Two Photon ◽  
Simulation Based ◽  
Transmission Measurements ◽  
Two Photon Absorption Coefficient ◽  
Theoretical Results ◽  
Good Agreement

The absorption of a monochromatic plane wave in a medium exhibiting linear, two- and three-photon absorption is investigated theoretically. An approximate closed-form expression is derived for the optical intensity. An effective two-photon absorption coefficient is then defined. Using the theoretical results, the absorption coefficients from transmission measurements are determined. Experiment is done in a highly absorbing nonlinear material such as As 2 Se 3 to illustrate our theoretical results. Good agreement is found between experimental data and numerical simulation based on our model. Measurements of nonlinear coefficients characterizing the two- and three-photon absorption are given.

Deflection and Force Experimental Verification of a Semicircular Polymeric Piezoelectric Actuator

1991 ◽  
Author(s):  
Diann Brei ◽  
James Blechschmidt
Keyword(s):  
Theoretical Model ◽  
Piezoelectric Actuator ◽  
Experimental Verification ◽  
Measurement Techniques ◽  
Theoretical Models ◽  
Bonding Layer ◽  
Step Process ◽  
Manufacturing Technique ◽  
New Methods ◽  
Deflection Voltage

Abstract This paper describes a manufacturing technique used to produce semicircular piezoelectric prototypes and the measurement techniques and results for three types of experiments performed to confirm the theoretical models. Since the microactuator design was new, unique and new methods of manufacturing had to be developed. This technique is a four step process that produces a prototype with a thin bonding layer with no bubbles. This prototype was tested and evaluated using three experiments: deflection-voltage, force-voltage, and force-deflection experiments. These experiments verified the theoretical model are correct.

Self-Compression and Diamond Nucleation In Irradiated Carbon Onions - A Theoretical Model

1998 ◽  
Vol 540 ◽  
Author(s):  
M. Zaiser
Keyword(s):  
Theoretical Model ◽  
Diamond Formation ◽  
Diamond Nucleation ◽  
Diamond Crystals ◽  
Carbon Onions ◽  
Experimental Findings ◽  
Theoretical Results ◽  
Good Agreement

AbstractThe nucleation of small diamond crystals during irradiation of spherical graphitic particles (’bucky onions’) is discussed. A mechanism for irradiation-induced self-compression of such ’onions’ is proposed. It is demonstrated that this may yield pressures which are sufficiently high for diamond formation. The theoretical results are in good agreement with experimental findings.

scholarly journals The κ-statistics approach to epidemiology

2020 ◽  
Author(s):  
Giorgio Kaniadakis ◽  
Mauro M. Baldi ◽  
Thomas S. Deisboeck ◽  
Giulia Grisolia ◽  
Dionissios T. Hristopulos ◽  
...  
Keyword(s):  
Theoretical Model ◽  
Statistical Approach ◽  
Weibull Model ◽  
Distribution Functions ◽  
Statistical Distributions ◽  
Systematic Analysis ◽  
Epidemiological Analysis ◽  
Theoretical Predictions ◽  
Theoretical Results ◽  
Good Agreement

Abstract A great variety of complex physical, natural and artificial systems are governed by statistical distributions, which often follow a standard exponential function in the bulk, while their tail obeys the Pareto power law. The recently introduced κ-statistics framework predicts distribution functions with this feature. A growing number of applications in different fields of investigation are beginning to prove the relevance and effectiveness of κ-statistics in fitting empirical data. In this paper, we use κ-statistics to formulate a statistical approach for epidemiological analysis. We validate the theoretical results by fitting the derived κ-Weibull distributions with data from the plague pandemic of 1417 in Florence as well as data from the COVID-19 pandemic in China over the entire cycle that concludes in April 16, 2020. As further validation of the proposed approach we present a more systematic analysis of COVID-19 data from countries such as Germany, Italy, Spain and United Kingdom, obtaining very good agreement between theoretical predictions and empirical observations. For these countries we also study the entire first cycle of the pandemic which extends until the end of July 2020. The fact that both the data of the Florence plague and those of the Covid-19 pandemic are successfully described by the same theoretical model, even though the two events are caused by different diseases and they are separated by more than 600 years, is evidence that the κ-Weibull model has universal features.

scholarly journals The κ-statistics approach to epidemiology

2020 ◽  
Vol 10 (1) ◽  
Author(s):  
Giorgio Kaniadakis ◽  
Mauro M. Baldi ◽  
Thomas S. Deisboeck ◽  
Giulia Grisolia ◽  
Dionissios T. Hristopulos ◽  
...  
Keyword(s):  
Theoretical Model ◽  
Statistical Approach ◽  
Weibull Model ◽  
Distribution Functions ◽  
Statistical Distributions ◽  
Systematic Analysis ◽  
Epidemiological Analysis ◽  
Theoretical Predictions ◽  
Theoretical Results ◽  
Good Agreement

AbstractA great variety of complex physical, natural and artificial systems are governed by statistical distributions, which often follow a standard exponential function in the bulk, while their tail obeys the Pareto power law. The recently introduced $$\kappa $$ κ -statistics framework predicts distribution functions with this feature. A growing number of applications in different fields of investigation are beginning to prove the relevance and effectiveness of $$\kappa $$ κ -statistics in fitting empirical data. In this paper, we use $$\kappa $$ κ -statistics to formulate a statistical approach for epidemiological analysis. We validate the theoretical results by fitting the derived $$\kappa $$ κ -Weibull distributions with data from the plague pandemic of 1417 in Florence as well as data from the COVID-19 pandemic in China over the entire cycle that concludes in April 16, 2020. As further validation of the proposed approach we present a more systematic analysis of COVID-19 data from countries such as Germany, Italy, Spain and United Kingdom, obtaining very good agreement between theoretical predictions and empirical observations. For these countries we also study the entire first cycle of the pandemic which extends until the end of July 2020. The fact that both the data of the Florence plague and those of the Covid-19 pandemic are successfully described by the same theoretical model, even though the two events are caused by different diseases and they are separated by more than 600 years, is evidence that the $$\kappa $$ κ -Weibull model has universal features.

Analysis of Swimming Properties and Design of Spiral-Type Magnetic Micromachine

2000 ◽  
Vol 12 (2) ◽  
pp. 165-171 ◽  
Author(s):  
Masahiko Sendoh ◽  
◽  
Noriyuki Ajiro ◽  
Kazushi Ishiyama ◽  
Mitsuteru Inoue ◽  
...  
Keyword(s):  
Flow Field ◽  
Optimum Design ◽  
Finite Volume ◽  
Operational Environment ◽  
Simulation Based ◽  
Blade Shape ◽  
Machine Structure ◽  
Spiral Type ◽  
Theoretical Results ◽  
Good Agreement

The swimming properties of spiral-type magnetic micromachines were analyzed theoretically by 2-dimensional finite volume. Good agreement between experimental and theoretical results was obtained. Swimming properties of micromachines depend strongly on the operational environment, including the flow field and machine structure. We analyzed the effect of machine shape on swimming properties. The optimum design of the blade shape was obtained by simulation. Based on optimum design, the micromachine was fabricated by stereolithography. Machine swimming agreed well with results.

scholarly journals Optimization of Thick Film Resistors for Low Drift

1980 ◽  
Vol 7 (1-3) ◽  
pp. 87-91 ◽  
Author(s):  
Gunnar Björklund ◽  
Lars Linde
Keyword(s):  
Theoretical Model ◽  
Thick Film ◽  
Transition Zone ◽  
Experimental Results ◽  
Film Resistor ◽  
Theoretical Predictions ◽  
Thick Film Resistor ◽  
Theoretical Results ◽  
Low Drift ◽  
Good Agreement

In order to minimize drift in a thick film resistor both printing and trimming parameters have to be optimized carefully.With the aid of a linear theoretical model it is shown how the resistance drift in the bulk transition zone and terminals of the resistor can be calculated for both trimmed and untrimmed resistors.The theoretical results are used for optimization of laser trimmed high ohmic resistors. The experimental results are in good agreement with the theoretical predictions and confirm that thick film resistors can be optimized for low drift.

Rigidity Analysis and Optimization of Warren Beams in Torsion

1977 ◽  
Vol 99 (1) ◽  
pp. 269-273
Author(s):  
R. C. Bahi ◽  
S. Chandra ◽  
P. C. Pandey
Keyword(s):  
Theoretical Model ◽  
Experimental Investigations ◽  
Rigidity Analysis ◽  
Static Performance ◽  
Weight Criterion ◽  
Experimental Values ◽  
Theoretical Results ◽  
Good Agreement

This paper reports analytical and experimental investigations on the static performance of warren beams in torsion. The theoretical results have been found to be in good agreement with the experimental values. The proposed theoretical model has further been used to obtain optimized proportions for the warren beams in terms of stiffness/weight criterion.

scholarly journals Акустические колебания алюминиевых мембран при лазерном возбуждении по термоупругому механизму

2020 ◽  
Vol 46 (10) ◽  
pp. 18
Author(s):  
А.Л. Глазов ◽  
К.Л. Муратиков
Keyword(s):  
Laser Radiation ◽  
Theoretical Model ◽  
Photoacoustic Signal ◽  
Frequency Range ◽  
Surface Absorption ◽  
Membrane Vibrations ◽  
Theoretical Results ◽  
Good Agreement

A theoretical model of the formation of a photoacoustic signal from metal membranes by laser radiation is proposed taking into account the excitation of defective states in them. The theoretical results obtained are compared for aluminum membranes with a thickness of 197 μm in the frequency range from 20 Hz to 7 kHz when they are excited by laser radiation with a wavelength of 660 nm. It is shown that the proposed theoretical model ensures good agreement between the experimental and theoretical results for membrane vibrations with a purely surface absorption of laser radiation.

Sign in / Sign up

Export Citation Format

Share Document