scholarly journals Electromechanical and Dynamic Characterization of In-House-Fabricated Amplified Piezo Actuator

2012 ◽  
Vol 2012 ◽  
pp. 1-8 ◽  
Author(s):  
P. K. Panda ◽  
B. Sahoo ◽  
S. Raja ◽  
Vijaya Kumar M. P. ◽  
V. Shankar
Keyword(s):  
Numerical Modeling ◽  
Amplification Factor ◽  
Piezo Actuator ◽  
Empirical Equations ◽  
Dynamic Characterization ◽  
Frequency Range ◽  
Maximum Displacement ◽  
Abaqus Software

A diamond-shaped amplified piezo actuator (APA) fabricated using six multilayered piezo stacks with maximum displacement of 173 μm at 175 V and the amplification factor of 4.3. The dynamic characterization of the actuator was carried out at different frequencies (100 Hz–1 kHz) and at different AC voltages (20 V–40 V). The actuator response over this frequency range was found neat, without attenuation of the signal. Numerical modeling of multilayered stack actuator was carried out using empirical equations, and the electromechanical analysis was carried out using ABAQUS software. The block force of the APA was 81 N, calculated by electromechanical analysis. This is similar to that calculated by dynamic characterization method.

scholarly journals Dynamic Characterization of Rubber O-Rings: Squeeze and Size Effects

2017 ◽  
Vol 2017 ◽  
pp. 1-12 ◽  
Author(s):  
Farid Al-Bender ◽  
Federico Colombo ◽  
Dominiek Reynaerts ◽  
Rodrigo Villavicencio ◽  
Tobias Waumans
Keyword(s):  
High Speed ◽  
Dynamic Characterization ◽  
Frequency Range ◽  
Damping Coefficients ◽  
Rubber Compounds ◽  
Frequency Independent ◽  
Stiffness And Damping ◽  
Gas Bearing ◽  
General Size

This paper concerns the dynamic characterization of rubber O-rings used to introduce damping in high speed gas bearing systems. O-shaped rubber rings composed of high temperature rubber compounds are characterized in terms of stiffness and damping coefficients in the frequency range 100–800 Hz. Simple formulas with frequency independent coefficients were identified to express the viscoelastic properties of the O-rings. The formulas proposed approximate the stiffness and damping coefficients of O-rings of general size.

Simulation and Dynamic Characterization of a 3-Layer Piezo-Actuated Valveless Micropump System

2010 ◽  
Author(s):  
Hamid SadAbadi ◽  
Arvind Chandrasekaran ◽  
Muthukuraman Packirisamy ◽  
Rolf Wuthrich
Keyword(s):  
Natural Frequencies ◽  
Dynamic Properties ◽  
Simulation Method ◽  
Piezo Actuator ◽  
Dynamic Characterization ◽  
Actuation Frequency ◽  
Valveless Micropump ◽  
Actuation System ◽  
Output Flow

In order to design the valveless micropump with a Piezo actuator, it is essential to understand the dynamic properties of the actuating system. Besides several other considerations in designing of microfluidic systems, the efficiency of valveless micropumps also strongly depends on parameters of the actuation system including the actuation frequency. Cleary, higher displacement of the diaphragm results in higher output flow rate of the pump. Thus, studying the dynamic behavior of the actuation system forms one of the important considerations for the design of micropumps. Three different models of the actuating system for the fabricated micropump system are proposed with different boundary conditions and are simulated by finite element method using ANSYS. Comparison of the experimental results and the simulation results of the natural frequencies of the system shows that the proposed simulation method can also be now used as a tool to optimize the design of the actuation system in terms of natural frequency of the system.

scholarly journals Structural and dynamic characterization of the C-terminal tail of ErbB2: disordered but not random

2021 ◽  
Author(s):  
L. Pinet ◽  
Y.-H. Wang ◽  
C. Deville ◽  
E. Lescop ◽  
F. Guerlesquin ◽  
...  
Keyword(s):  
Dynamic Characterization

Electrical characterization of aluminous cement at the early age in the 10 Hz–1 GHz frequency range

2000 ◽  
Vol 30 (7) ◽  
pp. 1057-1062 ◽  
Author(s):  
Youssef El Hafiane ◽  
Agnès Smith ◽  
Jean Pierre Bonnet ◽  
Pierre Abelard ◽  
Philippe Blanchart
Keyword(s):  
Electrical Characterization ◽  
Early Age ◽  
Frequency Range ◽  
Aluminous Cement

Dynamic characterization of small lead-acid cells

2001 ◽  
Vol 96 (1) ◽  
pp. 151-159 ◽  
Author(s):  
Alvin Salkind ◽  
Terrill Atwater ◽  
Pritpal Singh ◽  
Sudarshan Nelatury ◽  
Sangeetha Damodar ◽  
...  
Keyword(s):  
Dynamic Characterization ◽  
Lead Acid

Thermorheological Characterization of Elastoviscoplastic Carbopol Ultrez 20 Gel

2015 ◽  
Vol 137 (3) ◽  
Author(s):  
M. A. Hassan ◽  
Manabendra Pathak ◽  
Mohd. Kaleem Khan
Keyword(s):  
Experimental Investigation ◽  
Yield Stress ◽  
Elastic Properties ◽  
Viscous Dissipation ◽  
Power Law ◽  
Effect Of Temperature ◽  
Rheological Parameters ◽  
Frequency Range ◽  
Power Law Index

The temperature and concentration play an important role on rheological parameters of the gel. In this work, an experimental investigation of thermorheological properties of aqueous gel Carbopol Ultrez 20 for various concentrations and temperatures has been presented. Both controlled stress ramps and controlled stress oscillatory sweeps were performed for obtaining the rheological data to find out the effect of temperature and concentration. The hysteresis or thixotropic seemed to have negligible effect. Yield stress, consistency factor, and power law index were found to vary with temperature as well as concentration. With gel concentration, the elastic effect was found to increase whereas viscous dissipation effect was found to decrease. Further, the change in elastic properties was insignificant with temperature in higher frequency range of oscillatory stress sweeps.

scholarly journals Dynamic Characterization of Cercal Mechanosensory Hairs of Crickets

Insects ◽  
2012 ◽  
Vol 3 (4) ◽  
pp. 1028-1038
Author(s):  
Joel M. Book ◽  
Samuel F. Asokanthan
Keyword(s):  
Dynamic Characterization

Dynamic Characterization of Viscoelastic Materials

2004 ◽  
Author(s):  
Eduardo Romann Martini ◽  
Andrea Tonoli ◽  
Nicola Amati ◽  
Andrea Guala
Keyword(s):  
Dynamic Characterization ◽  
Viscoelastic Materials
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