Results 221 to 230 of about 22,436 (254)
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Proceedings of the 2004 IEEE International Frequency Control Symposium and Exposition, 2004., 2005
The input electric impedance, Z/sub /spl omega//, for a three-layer (electrode/piezoelectric film/electrode) and a four layer (electrode/piezoelectric film/electrode/substrate) thin film bulk acoustic wave resonator, is derived by a one-dimensional transfer matrix method to describe the thin film resonator behavior, especially the effect of electrode ...
null Qingming Chen +2 more
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The input electric impedance, Z/sub /spl omega//, for a three-layer (electrode/piezoelectric film/electrode) and a four layer (electrode/piezoelectric film/electrode/substrate) thin film bulk acoustic wave resonator, is derived by a one-dimensional transfer matrix method to describe the thin film resonator behavior, especially the effect of electrode ...
null Qingming Chen +2 more
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Smart Structures and Systems, 2014
This paper presents a linear computational homogenization framework to evaluate the effective (or generalized) electromechanical coupling coefficient (EMCC) of adaptive structures with piezoelectric structural fiber (PSF) composite elements. The PSF consists of a silicon carbide (SiC) or carbon core fiber as reinforcement to a fragile piezo-ceramic ...
Yao Koutsawa +3 more
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This paper presents a linear computational homogenization framework to evaluate the effective (or generalized) electromechanical coupling coefficient (EMCC) of adaptive structures with piezoelectric structural fiber (PSF) composite elements. The PSF consists of a silicon carbide (SiC) or carbon core fiber as reinforcement to a fragile piezo-ceramic ...
Yao Koutsawa +3 more
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Applied Physics Letters, 2007
Electromechanical coupling coefficient directly reflects the electromechanical energy conversion capability of a piezoelectric device. We show theoretically that the kerf filler in the ultrasonic array transducer can degrade this coupling coefficient.
Jungsoon Kim, Moojoon Kim, Wenwu Cao
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Electromechanical coupling coefficient directly reflects the electromechanical energy conversion capability of a piezoelectric device. We show theoretically that the kerf filler in the ultrasonic array transducer can degrade this coupling coefficient.
Jungsoon Kim, Moojoon Kim, Wenwu Cao
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Ultrasonics, 2000
An approximate formula has been developed to determine the electromechanical coupling coefficient of the piezoelectric film in a four-layer composite resonator, which includes two electrodes. In this formula, the coupling coefficient can be calculated from the distribution of the effective coupling coefficients, k2eff, which are given by the modal ...
, Zhang, , Wang, , Cheeke
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An approximate formula has been developed to determine the electromechanical coupling coefficient of the piezoelectric film in a four-layer composite resonator, which includes two electrodes. In this formula, the coupling coefficient can be calculated from the distribution of the effective coupling coefficients, k2eff, which are given by the modal ...
, Zhang, , Wang, , Cheeke
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Ferroelectrics Letters Section, 2009
PZT-cement composites were produced using PZT ceramic of different particle size (3.8 μ m to 620 μ m). The effect of PZT particle size on the electromechanical coupling coefficient (Kt) of the composites was then investigated. The results showed that the particle size of PZT used to produce the composite has a noticeable effect on the Kt values.
A. CHAIPANICH, N. JAITANONG
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PZT-cement composites were produced using PZT ceramic of different particle size (3.8 μ m to 620 μ m). The effect of PZT particle size on the electromechanical coupling coefficient (Kt) of the composites was then investigated. The results showed that the particle size of PZT used to produce the composite has a noticeable effect on the Kt values.
A. CHAIPANICH, N. JAITANONG
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Journal of Vibration and Control, 2020
Smart sandwich cantilevers with aluminum faces and single and double cores, formed by assembled shear-mode piezoceramic patches with same poling, are experimentally and numerically assessed for the first time. To measure the electromechanical coupling efficiency of such vibrating smart structures, the so-called modal effective electromechanical ...
Pelin Berik, Ayech Benjeddou
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Smart sandwich cantilevers with aluminum faces and single and double cores, formed by assembled shear-mode piezoceramic patches with same poling, are experimentally and numerically assessed for the first time. To measure the electromechanical coupling efficiency of such vibrating smart structures, the so-called modal effective electromechanical ...
Pelin Berik, Ayech Benjeddou
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Advanced Materials Research, 2012
Electromechanical coupling coefficient of cement-based piezoelectric composites affected by pozzolanic materials and poling field are investigated. Specimens, through a pressure approach, are manufactured by combining PZT powders and cement-based binder with the same volume fraction.
Dung Hung Lin +3 more
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Electromechanical coupling coefficient of cement-based piezoelectric composites affected by pozzolanic materials and poling field are investigated. Specimens, through a pressure approach, are manufactured by combining PZT powders and cement-based binder with the same volume fraction.
Dung Hung Lin +3 more
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Approximate Evaluations of the Modal Effective Electromechanical Coupling Coefficient
2009This contribution reviews and derives, in a unified manner using energy concepts, available formulas in the smart structures literature for the approximate evaluation of the modal effective electromechanical coupling coefficient (EMCC). A new approximate formula is then proposed; it has the advantage to use only short-circuit and open-circuit elastic ...
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The European Physical Journal Plus, 2019
The electromechanical coupling factor (K2) presents a key parameter in acoustic devices that reflects the influence of piezoelectricity on the phase velocity of elastic waves. The higher this coefficient, the stronger the dependence of the characteristics of wave propagation on the electric-system parameters.
Cherif Othmani +3 more
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The electromechanical coupling factor (K2) presents a key parameter in acoustic devices that reflects the influence of piezoelectricity on the phase velocity of elastic waves. The higher this coefficient, the stronger the dependence of the characteristics of wave propagation on the electric-system parameters.
Cherif Othmani +3 more
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Physical Review B, 2006
We investigate the influence of the direct and converse piezoelectric effect, i.e., electromechanical coupling (EC), on the strain and the built-in electric field in hexagonal group-III nitride heterostructures under hydrostatic pressure. Particularly, we derive the analytic formulas for pressure dependences of the strain tensor components and the ...
S. P. Łepkowski, J. A. Majewski
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We investigate the influence of the direct and converse piezoelectric effect, i.e., electromechanical coupling (EC), on the strain and the built-in electric field in hexagonal group-III nitride heterostructures under hydrostatic pressure. Particularly, we derive the analytic formulas for pressure dependences of the strain tensor components and the ...
S. P. Łepkowski, J. A. Majewski
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