Stress isolation PZT-Air composites

Sherrit, Stewart; Wiederick, H. D.; Mukherjee, B. K.; Prasad, S. E.

doi:10.1080/00150199208009072

Cited by 6 publications

(4 citation statements)

References 9 publications

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“…The impedance equation of the LE mode resonator as a function of frequency is given as equation ( 8), where g 33 is the piezoelectric voltage constant along the thickness direction. f p has the same meaning as that of the TE mode resonator [9,21]. In this case, the unknown complex parameters were s D 33 and g 33 because ε T 33 was already determined using the LTE mode resonator.…”

Section: Length Extensional (Le) Mode Resonatormentioning

confidence: 99%

“…As the most common method, the iterative calculation method was described by Smits to provide accurate and useful results [11,18]. On the other hand, this method requires judicious choices of the measured admittance or impedance points [19][20][21]. Alemany suggested an iterative and automatic method for improving Smits' method, and determined the complex properties of modified lead titanate (PZ34) and lead zirconate titanate (PZ27) [19,20].…”

Section: Introductionmentioning

confidence: 99%

“…Alemany suggested an iterative and automatic method for improving Smits' method, and determined the complex properties of modified lead titanate (PZ34) and lead zirconate titanate (PZ27) [19,20]. In addition, Kwok evaluated the performance of a range of characterization methods and compared the calculation results of five different methods: the IEEE standard [9], methods reported by Smits [11,18] and Sherrit [12,21], the piezoelectric resonance analysis program (PRAP) and a nonlinear regression method [22]. Among these methods, the nonlinear regression procedure according to the Gauss-Newton method produced the most accurate results with less computation time.…”

Section: Introductionmentioning

confidence: 99%

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Determination of the complex material constants of PMN–28%PT piezoelectric single crystals

Joh

Kim

Roh

2013

Smart Mater. Struct.

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The accurate characterization of piezoelectric crystals should include the loss properties of the materials, which are represented as the imaginary parts of the material constants. The full complex properties of PMN-PT single crystals have never been evaluated. This paper proposes an automated iterative method to determine the complex material constants of PMN-28%PT single crystals. The PMN-28%PT single crystals were grown using the Bridgman method and were poled along the [001] direction to have 4mm effective symmetry. Five different resonators suitable for 4mm symmetry were used to analyze the impedance and admittance spectra of the distinctive resonant modes. The complex material constants were determined by the nonlinear regression of the impedance and admittance spectrum equations for each resonator through the iteration process to fit the measured spectra of the corresponding modes. The efficacy of the characterization method and the accuracy of the complex material constants determined using this method were verified by a comparison of the immittance spectra from the measurements with those from the calculation using the complex constants.

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Section: Length Extensional (Le) Mode Resonatormentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Determination of the complex material constants of PMN–28%PT piezoelectric single crystals

Joh

Kim

Roh

2013

Smart Mater. Struct.

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“…Several authors [11][12][13][14] developed methods for the complex characterization of piezoceramics from complex impedance (or its reciprocal, the complex admittance) measurements at resonance, whose validity has been analysed elsewhere [15,16]. Alemany et al developed an automatic iterative method, applied in a first publication [17] to four modes of resonance used in the Standards: (1) the length extensional mode of a thickness poled rectangular bar; (2) the length extensional mode of long rods or rectangular bars, length poled; (3) the thickness extensional mode of a thin plate or disc, thickness poled and (4) the thickness shear mode of an in-plane poled thin plate.…”

Section: Introductionmentioning

confidence: 99%

A non-Standard shear resonator for the matrix characterization of piezoceramics and its validation study by finite element analysis

Pardo¹,

Algueró²,

Brebøl³

2007

J. Phys. D: Appl. Phys.

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Standard shear samples used for piezoceramic characterization lead to underestimation of the piezoelectric shear coefficients due to its dynamical clamping at resonance. This work presents the application of Alemany et al.´s automatic iterative method to the resonance of a non-Standard shear sample, in order to determine the related complex parameters of piezoceramics, thus including losses, from impedance measurements. The matrix of dielectric, elastic and piezoelectric complex parameters that fully characterize a piezoceramic, a 6mm symmetry material, can be obtained from such shear data combined with the application of the method to three other electromechanical resonances, namely: the length extensional mode of long rods or rectangular bars, length poled; the thickness extensional mode of a thin plate or disk, thickness poled, and the radial mode of a thin disk, thickness poled. Shear results are here obtained for non-Standard samples of a commercial Navy type II piezoceramic, solving the underestimation of the coefficients in the Standard shear sample and allowing the improvement of the previously reported characteristic matrix from Standard samples. Three-dimensional Finite Element Analysis (FEA) modelling of the resonances of the three material samples used in the matrix characterization was here accomplished using the improved matrix of dielectric elastic and piezoelectric material coefficients including all losses. The comparison of the experimental resonance spectra of this piezoceramic samples and the FEA results obtained for the elastically, dielectrically and piezoelectrically homogeneous items modelled is here presented and discussed.

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Vibration Control in Ship Structures

Koko

Akpan

Berry

et al. 2002

Encyclopedia of Smart Materials

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The dominant sources of noise radiation in water are from ship engines and machinery—the propeller cavitation noise, the noise radiation from propeller blades, and the hydrodynamic pressure fluctuations induced by turbulent water flow along the ship's hull. At speeds below propeller cavitation inception, a ship's acoustic signature is generally dominated by structurally transmitted noise from onboard machinery. Reduction or control of ship noise has traditionally been implemented by passive means, such as by the use of vibration isolation mounts, flexible pipe‐work, and interior acoustic absorbing materials. However, these passive noise control techniques are effective mostly for attenuating high‐frequency noise; they are generally ineffective for controlling low‐frequency noise. There are, on the other hand, active noise control methods that have been proven to be effective in controlling low‐frequency and tonal noise. These active control methods could be used instead of, or in combination with, passive techniques, for controlling or reducing ship noise. Active noise control (ANC) involves the reduction or elimination of noise by modification of the dynamic properties of a system or by noise cancellation through linear superposition of a secondary noise field of equal but opposite strength. An active noise control system will typically consist of all or some of the following ingredients: sensors, actuators, and controllers.

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Stress isolation PZT-Air composites

Cited by 6 publications

References 9 publications

Determination of the complex material constants of PMN–28%PT piezoelectric single crystals

Determination of the complex material constants of PMN–28%PT piezoelectric single crystals

A non-Standard shear resonator for the matrix characterization of piezoceramics and its validation study by finite element analysis

Vibration Control in Ship Structures

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