• Journal of the Korean Institute of Electrical and Electronic Material Engineers
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• v.13 no.1
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• pp.39-46
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• 2000

An analysis of the free vibration for the metal-piezoceramic laminated thin plates is described. The purpose of this study is to develop a equivalent method for the free vibration analysis of metal-piezoce-ramic laminated thin plate which are not sysmmetric about the adhered layer and the piezoelectric effect. In order to confirm the validity of the vibration analysis, double Fourier sine series is used as a modal displacement function of a metal-piezoceramic laminated thin plate and applied to the free vibration analysis of the plate under various boundary conditions.

• Proceedings of the Korean Society for Noise and Vibration Engineering Conference
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• 1997.04a
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• pp.418-422
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• 1997

A numerical computation and experimental test have been performed for the investigation of dynamic behavior of composite beams with bonded piezo ceramics. The present finite element method based on layerwise approach can effectively evaluate the characteristics of the composite beams with bonded piezo ceramics. The natural frequencies and damping values were measured by fitting the frequency response function obtained from FFT analyzer. The frequency-dependent damping properties of composite material were measured to utilize them for the finite element analysis of the composite beams with bonded piezo ceramics. The experimental results are in good agreement with those of finite element analysis.

• Ceramist
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• v.22 no.1
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• pp.82-95
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• 2019

Piezoelectric materials can directly convert mechanical energy to electrical one, and vice versa. Research on piezoelectric materials and devices has a long history, and now many relevant products are available in a wide range of applications such as medical, military, industrial, home appliance, and mobile electronics. One of the major research trends now is not only to further improve the physical properties of the piezoelectric materials, but also to reduce the size of the piezoelectric devices. This review focuses on the development of piezoelectric thin films that can enhance the performance of microtransducers.

• Proceedings of the KIEE Conference
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• 1997.07d
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• pp.1510-1512
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• 1997

Piezoelectric characteristics of lead zirconate(PZ)-lead titanate(PT)-lead manganese antimony(PMS) ceramics with the various changes of calcination temperature in PMS were prepared. The range of their sintering temperature was from $1100^{\circ}C$ to $1250^{\circ}C$. The electro-mechanical properties of PZ-PT-PMS ceramics such as piezoelectric constant, electro-mechanical coupling coefficient, and mechanical quality factor are measured as a function of the calcination temperature of PMS. As increasing the calcination temperature of PMS mechanical quality factor is increased.

• Proceedings of the KIEE Conference
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• 1994.07b
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• pp.1283-1285
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• 1994

A three-layered piezoelectric ceramic transducer is fabricated with three piezoelectric ceramic disk transducers and two sheets of thin insulator. Its equvalent circuit is derived from the Mason's model of a thickness-driven piezoelectric transducer. We applied the electric input near its fundamental resonant frequency to the center transducer and connect the output voltages across the left and right transducers in series to the resistor load. Then we investigate the load characteristics at resonant frequencies under various resistor loads and the frequency characteristics near the resonant frequency under no load. Moreover, symbolic expressions for input impedances, voltage ratios, resonant frequencies, and bandwidths have been derived. The values calculated from those symbolic expressions are shown to agree well with the measurement values.

• Journal of the Korean Institute of Electrical and Electronic Material Engineers
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• v.22 no.5
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• pp.405-410
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• 2009

The conventional ultrasonic nozzle produces a mist by applying an ultrasonic vibration into a non-flowering liquid. In this paper, we first present a novel designed nozzle type sprayer that is able to apply an ultrasonic vibration directly to the moving liquid and generate a mist instantly. For the novel nozzle, a ring-type actuator of the novel nozzle was designed and built using the PZW-PMN-PZT ceramics. This paper will describe a variety of physical, mechanical, and electrical characteristics of the ultrasonic nozzle. The characteristics of the mist particles was also measured as the amount of the outflow liquid was varied.

• 전기의세계
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• v.27 no.3
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• pp.43-46
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• 1978

The prezoelectric ceramic specimen compoxed of PbO, ZrO$_{2}$, TiO$_{2}$ were prepared in this Lab, and showed properties of dielectric constant .epsilon.$^{33}$ /.epsilon.$_{0}$ 487 at 1kHz, electromechanical coefficient Kr 0.524. As the characteristics of piezoelectric HF filter used these piezoelectric specimen were the resonant point 6.7 MHz, effective bandwidth 690KHz, it was exellant. Since a LC resonant filter can be replaced bt this piezoelectric HG filter, it will greatly contribute to compose a compact circuit. If the resont point can be controlled, this piezoelectric HF filter practically.

• Proceedings of the Korean Institute of Electrical and Electronic Material Engineers Conference
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• 1999.05a
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• pp.625-629
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• 1999

In this study, in order to develop high sensitivity and low noise acoustic emission sensor, we manufactured the Pb(Zr, Ti)O$_3$ ceramics with the addition of WO$_3$ wt% to search for its required characteristics. Dielectric constant was increased as a function of the increase of WO$_3$ wt%. The Pb(Zr, Ti)O$_3$ (EC-65) ceramics added with 0.1lwt% WO$_3$ showed excellent dielectric constant and piezoelectric constants of 1931 and 199.55$\times$10$^{-12}$ (C/N), respectively. Accordingly It was shown as the composition ceramics suitable for AE sensor.

• The Journal of the Acoustical Society of Korea
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• v.31 no.8
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• pp.569-579
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• 2012

Typical Tonpilz type underwater acoustic transducers making use of piezoelectric ceramics detect the magnitude of an acoustic pressure, a scalar quantity, and convert this pressure into a proportional output voltage. The scalar sensor has no directional sensitivity. In this paper, we have proposed a new vector sensor based on the Tonpilz transducer structure, which is sensitive to both the magnitude and the azimuthal direction of an acoustic wave. Validity of this new design has been confirmed with analytic equations and finite element analyses.

• Proceedings of the Korean Institute of Electrical and Electronic Material Engineers Conference
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• 1999.11a
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• pp.256-259
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• 1999

The purpose of this study is to develop the material for multiayer piezoelectric ceramic transformer because multiayer piezoelectric transformer must need low sintering temperature. So that PMN-PSN-PZT family ceramics were added with glass brit(SiO$_2$ $.$ PbO). The dielectric and piezoelectric properties were increased with increasing it until the amounts of additive 0.8wt%. Sintering temperature were low about 100[$^{\circ}C$]. Accordingly, This material could be used to multiayer piezoelectric transformer .