The Influence of Multiple Piezoelectric Effects on Elastic Coefficient of Piezoelectric Ceramics

2011 ◽  
Vol 305 ◽  
pp. 348-352 ◽  
Author(s):  
Zhong Hua Zhang ◽  
Guang Ming Cheng ◽  
Jun Wu Kan ◽  
Ping Zeng ◽  
Jian Ming Wen
Keyword(s):  
Performance Improvement ◽  
Experimental Validation ◽  
Piezoelectric Ceramics ◽  
Elastic Compliance ◽  
Theoretical Research ◽  
New Materials ◽  
Elastic Coefficient ◽  
Compliance Coefficient ◽  
Piezoelectric Effects ◽  
Compliance Coefficients

The development of new materials and the performance improvement of existing materials become an important subject from different aspects. In this paper, based on the theoretical research results of multiple piezoelectric effects, the influence of multiple piezoelectric effects on elastic coefficient of piezoelectric ceramics is studied. Theoretical analysis indicates that it is multiple piezoelectric effects that make piezoelectrics have two kinds of elastic and they result in the decrease of elastic compliance coefficients. Experimental validation is performed through PZT-5. Experimental results show that elastic compliance coefficient grows decreased by 0.912 times.

Influence of Multiple Piezoelectric Effects on Piezoelectric Coefficient of Piezoelectric Ceramics

2011 ◽  
Vol 101-102 ◽  
pp. 922-925 ◽  
Author(s):  
Zhong Hua Zhang ◽  
Guang Ming Cheng ◽  
Jun Wu Kan ◽  
Ping Zeng ◽  
Jian Ming Wen
Keyword(s):  
Boundary Condition ◽  
Theoretical Analysis ◽  
Experimental Validation ◽  
Piezoelectric Coefficient ◽  
Short Circuit ◽  
Piezoelectric Ceramics ◽  
Open Circuit ◽  
Experimental Results ◽  
Experimental Result ◽  
Piezoelectric Effects

In this paper, theoretical analysis is performed on the influence of multiple piezoelectric effects on piezoelectric coefficients. And a kind of classical piezoelectric ceramics was adopted to conduct the experimental validation. The experimental results of short-circuit boundary condition are obtained by the methods that a capacitor whose capacitance is much larger than that of the stack is parallel with PZT-5. Influence results are obtained through comparing them with open-circuit piezoelectric coefficient. Experimental result shows that multiple piezoelectric effects make piezoelectric coefficient of PZT-5 be altered by 18%.

scholarly journals Performance Improvement of a Hydraulic Active/Passive Heave Compensation Winch Using Semi Secondary Motor Control: Experimental and Numerical Verification

Energies ◽  
2020 ◽  
Vol 13 (10) ◽  
pp. 2671
Author(s):  
Geir-Arne Moslått ◽  
Michael Rygaard Hansen ◽  
Damiano Padovani
Keyword(s):  
Performance Improvement ◽  
Experimental Validation ◽  
Control Method ◽  
Feedforward Control ◽  
State Of The Art ◽  
Numerical Verification ◽  
Stability Margins ◽  
Hydrostatic Transmission ◽  
Expected Performance ◽  
Variable Displacement

In this paper, a newly developed controller for active heave compensated offshore cranes is compared with state-of-the-art control methods. The comparison is divided into a numerical part on stability margins as well as operational windows and an experimental validation of the expected performance improvement based on a full-scale testing on site with a crane rated to 250 metric tons. Such a crane represents the typical target for the new control method using a combination of active and passive hydraulic actuation on the main winch. The active hydraulic actuation is a hydrostatic transmission with variable-displacement pumps and variable-displacement motors. The new controller employs feedforward control of the motors’ displacement so that the window of operation is increased and, simultaneously, oscillations in the system are markedly reduced.

First-Principle Calculation of Elastic Compliance Coefficients for BiFeO3

2009 ◽  
Vol 386 (1) ◽  
pp. 133-138 ◽  
Author(s):  
Y. L. Wang ◽  
Z. H. Wu ◽  
Z. C. Deng ◽  
L. Z. Chu ◽  
B. T. Liu ◽  
...  
Keyword(s):  
Elastic Compliance ◽  
First Principle ◽  
Principle Calculation ◽  
First Principle Calculation ◽  
Compliance Coefficients

Investigation on Multi-Piezoelectric Effects from the First Positive Piezoelectric Effect

2014 ◽  
Vol 609-610 ◽  
pp. 1398-1403 ◽  
Author(s):  
Li Ping Shi ◽  
Jie Huang ◽  
Xi Wen Wei ◽  
Yan Bo Wei
Keyword(s):  
Experimental Data ◽  
Boundary Conditions ◽  
Experimental Research ◽  
External Force ◽  
Piezoelectric Effect ◽  
Piezoelectric Ceramics ◽  
Applied Force ◽  
Piezoelectric Effects ◽  
Effect Theory ◽  
Converse Piezoelectric Effect

Based on the traditional piezoelectric effect theory, the process of multi-piezoelectric effects generation is analyzed and the theory of the secondary and tertiary piezoelectric effect is deduced by four kinds of piezoelectric equations. Experimental research is performed through the PZT-5 piezoelectric ceramics stack, the existence of multi-piezoelectric effects is verified and experimental data is obtained under certain boundary conditions. The experimental data results show that if an external force which is applied to the positive piezoelectric effect is 400, the displacement generated by the secondary converse piezoelectric effect is 0.16. Therefore, starting from the first positive piezoelectric effect of the piezoelectric ceramics under applied force, the displacement generated by the secondary converse piezoelectric effect and the voltage generated by the tertiary positive piezoelectric effect are all linear with the applied force.

Elasticity

2004 ◽  
Author(s):  
Robert E. Newnham
Keyword(s):  
High Stress ◽  
Elastic Stiffness ◽  
Elastic Compliance ◽  
Elastic Behavior ◽  
Hooke’S Law ◽  
Stress Levels ◽  
The Face ◽  
Hooke's Law ◽  
Stiff Material ◽  
Compliance Coefficients

All solids change shape under mechanical force. Under small stresses, the strain x is related to stress X by Hooke’s Law (x) = (s)(X), or the converse relationship (X) = (c)(x). The elastic compliance coefficients (s) are generally reported in units of m2/N, and the stiffness coefficients (c) in N/m2. For a fairly stiff material like a metal or a ceramic, c is about 1011 N/m2 = 1012 dynes/cm2 = 100 GPa = 0.145 × 108 PSI. Hooke’s Law is a linear relation between stress and strain, and does not describe the elastic behavior at high stress levels that requires higher order elastic constants (Chapter 14). Irreversible phenomena such as plasticity and fracture occur at still higher stress levels. Two directions are needed to specify stress (the direction of the force and the normal to the face on which the force acts), and two directions are needed to specify strain (the direction of the displacement and the orientation of the measurement axis). Thus there are four directions involved in measuring elastic stiffness, which is therefore a fourth rank tensor: . . . Xij = cijklxkl . . . .

scholarly journals Large scale in silico screening of materials for carbon capture through chemical looping

2017 ◽  
Vol 10 (3) ◽  
pp. 818-831 ◽  
Author(s):  
Cindy Y. Lau ◽  
Matthew T. Dunstan ◽  
Wenting Hu ◽  
Clare P. Grey ◽  
Stuart A. Scott
Keyword(s):  
In Silico ◽  
Carbon Capture ◽  
Large Scale ◽  
Experimental Validation ◽  
Experimental Methodology ◽  
Chemical Looping Combustion ◽  
Chemical Looping ◽  
New Materials ◽  
In Silico Screening

A combined computational and experimental methodology is developed to predict new materials that can reversibly produce oxygen for chemical looping combustion, and then promising candidates are selected for experimental validation of these predictions.

Analytical Solution for Shear Horizontal Wave Propagation in Piezoelectric Coupled Media by Interdigital Transducer

2004 ◽  
Vol 72 (3) ◽  
pp. 341-350 ◽  
Author(s):  
Q. Wang ◽  
S. T. Quek ◽  
V. K. Varadan
Keyword(s):  
Wave Propagation ◽  
Analytical Solution ◽  
Theoretical Research ◽  
Piezoelectric Medium ◽  
Infinite Length ◽  
Shear Horizontal Wave ◽  
Piezoelectric Effects ◽  
Horizontal Wave ◽  
Interdigital Transducer ◽  
Shear Horizontal

An analytical solution for the shear horizontal wave propagation excited by interdigital transducer in a piezoelectric coupled semi-infinite medium is developed. This solution is an extension of earlier work on wave propagation in a piezoelectric coupled plate with finitely long interdigital transducer by fully taking account of piezoelectric effects in analysis. In the current analysis, the mathematical model for a semi-infinite metal substrate bonded by a layer of interdigital transducer with infinite length is first derived. The theoretical solutions are obtained in terms of elliptic integration of the first kind and of the standard integral representation for Legendre polynomial. The essential hypothesis for the derivation of the analysis is investigated. Based on the solution for infinitely long interdigital transducer, an analytical solution for the wave propagation in this semi-infinite piezoelectric medium excited by a finitely long interdigital transducer is obtained through Fourier transform. This theoretical research can be applied to health monitoring of structures by interdigital transducer. It could also be used as a framework for the design of interdigital transducer in wave excitation of smart structures.

scholarly journals Influence of Drop Velocity and Droplet Spacing on the Equilibrium Saturation Level in Binder Jetting

2021 ◽  
Author(s):  
Trenton Colton ◽  
Joseph Liechty ◽  
Alden McLean ◽  
Nathan Crane
Keyword(s):  
Material Properties ◽  
Experimental Validation ◽  
Dimensional Accuracy ◽  
Saturation Level ◽  
New Materials ◽  
Green Strength ◽  
Drop Velocity ◽  
Reduce Development Time ◽  
The Impact ◽  
Binder Jetting

Understanding the equilibrium saturation level is crucial to Binder Jetting (BJ). Saturation level influences dimensional accuracy, print time, green strength, and final material properties. Improved understanding of the saturation level can reduce development time for new materials and improve existing processes in BJ. Attempts have been made to predict saturation levels of parts with simple calculations from droplet primitives and capillary pressure. There is, however, limited experimental validation for these methods and they do not include the impact of drop velocity and droplet spacing. This study incorporates the influences of drop velocity and droplet spacing on the saturation level of the part. Drop primitives of varying droplet velocity and droplet spacing were compared. Results show that velocity impacts the feasible parameter space.

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