• Title/Summary/Keyword: piezoelectric transducer

Search Result 391, Processing Time 0.029 seconds

Equivalent Circuit Modeling of Wideband Underwater Acoustic Piezoelectric Vibrator (광대역 수중 음향 압전 진동체의 등가회로 모델링)

  • 조치영;김원호;윤형규
    • Journal of KSNVE
    • /
    • v.6 no.5
    • /
    • pp.645-652
    • /
    • 1996
  • In this paper an identification method is presented to obtain the equivalent electric circuit model of a wideband underwater acoustic piezoelectric vibrator. Unknown parameters involved in the equivalent circuit are indentified using the measured electrical admittances in air. The proposed method is applied to an example transducer. The validity of equivalent circuit model is demonstrated by the comparison between the experimental measurements and analytical calculations of TVR(transmitting voltage response) in water.

  • PDF

An automatic calibration technique for piezoelectric pressure sensors (압전형 압력센서의 교정기법 자동화)

  • Choi, Ju-Ho;Lyou, Joon
    • Journal of Institute of Control, Robotics and Systems
    • /
    • v.3 no.4
    • /
    • pp.357-362
    • /
    • 1997
  • This paper suggests an automatic calibration technique for piezoelectric low pressure transducer measuring a pressure blow 500psi. The present calibration system embedded with error correction algorithm generates it's best you don't cut parts of wards like so dynamic pressure and compensates offset voltage and pressure error. It is shown via experimental results that the instrumentation accuracy has been improved and mean time between calibrations has been shortened.

  • PDF

Vibration Characteristics of Langevin-Type Piezoelectric Torsional Transducers (랑주방형 압전 비틀림 변환기의 진동특성)

  • Kwon, Oh-Soo;Kim, Jin-Oh
    • Proceedings of the KSME Conference
    • /
    • 2000.11a
    • /
    • pp.612-617
    • /
    • 2000
  • The vibrational characteristics of Langevin-type piezoelectric torsional transducers have been studied theoretically and experimentally in this paper. The differential equations of piezoelectric torsional motion have been derived in terms of the circumferential displacement and the electric potential. Solutions of the boundary-value problem have yielded the natural frequencies and mode shapes of the transducers. The theoretical solutions have been verified by comparing the numerical results with experimental ones.

  • PDF

Radial Vibration of Cylindrical Piezoelectric Transducers (원통형 압전 변환기의 반경방향 진동 특성)

  • 김진오;정형곤
    • Proceedings of the Korean Society for Noise and Vibration Engineering Conference
    • /
    • 2001.11b
    • /
    • pp.1138-1143
    • /
    • 2001
  • The paper deals with a theoretical study on the radial vibration of cylindrical piezoelectric transducers. The differential equations of piezoelectric radial motion have been derived in terms of the radial displacement and electrical potential. Applying mechanical and electrical boundary conditions has yielded the characteristic equations of natural vibration. Numerical results of the fundamental natural frequency have been compared with experimental observations for the transducers of several sizes, and have shown a good agreement.

  • PDF

A Study on the Transducer Calibration for Acoustic Emission Measurement (AE 측정을 위한 탐촉자의 보정에 대한 고찰)

  • 김교원
    • The Journal of Engineering Geology
    • /
    • v.6 no.2
    • /
    • pp.53-58
    • /
    • 1996
  • In order to investigate the source mechanism of micro cracks through acoustic emission measurement induced by rock fracture, careful calibration of the entire linkage of the detecting system, from the transducers to transient recorder, is an essential requirement prior to testing. Transducers and digitiging system are generally the weakest links in the measurement system because they must translate mechanical motions into digital electric signals. In this study, PAC piezoelectric pressure transducers are calibrated with a standard NBS conical shaped displacement transducer and a DG piezoelectric displacement transducer. The NBS and PAC transducers are insensitive to changes in horizontal impingement angle but sensitive to changes in incident angle. The ray path along the logitudinal axis of the tranducer produced a maximum response while the ray path perpendicular to the transducer axis gave a minimum. And a difference in individual transducers factor for a peak-to-peak amplitude of PAC transducers was within 40%. An average PAC transducer coefficient was determined as 77mv/pm by an absolute calibration test using NBS transducer.

  • PDF

A Study of a Wideband Acoustic Transducer for Underwater Communication Using 1-3 Type Piezoelectric Transducer (1-3형 압전 복합체를 이용한 광대역 수중 통신용 음향 트랜스듀서에 관한 연구)

  • Lee, Kyung-Woo;So, Hyoung-Jong;Lim, Sil-Mook;Kim, Won-Ho;Cho, Wun-Hyun
    • Journal of Ocean Engineering and Technology
    • /
    • v.22 no.2
    • /
    • pp.65-71
    • /
    • 2008
  • Recently, many researches in relation to data transmission with faster speed and greater volume, many researches have been carried out on sonar systems for underwater communication. According to these researches, an acoustic transducer for underwater communication requires wide bandwidth properties. In domestic researches for underwater communication sonar, an operating frequency in the range of $20{\sim}40\;kHz$ is used. In this paper, we propose anon-resonance type acoustic transducer for underwater communication. The TVR (transmitting voltage response) characteristics increased linearly as the frequency increased, and the RVS (receiving voltage sensitivity) characteristics were constant as the frequency increased. Traditional techniques for wide bandwidth transducershave a limit and a transmission loss difference at lower and higher frequency operating ranges. In this paper, the new transducer proposed decreased the transmission loss under some conditions. It was optimized with the FE analysis tool (ATILA) and evaluated using the TVR and the RVS characteristics in the range of $10{\sim}90\;kHz$. The value of TVR was 138 dB at 20 kHz and 148 dB at 40 kHz, and the differences was 12 dB. The value of RVS was $195{\pm}2\;dB$ and nearly constant. From theseresults, it is certain that the developed transducers can be used for an underwater communication network in the 1.3 km range with both a 20 kHz bandwidth and 30 kHz center frequency.

Three Dimensional Finite Element Analysis for Piezoelectric Transformer

  • Joo, Hyun-Woo;Lee, Chang-Hwan;Jung, Hyun-Kyo
    • KIEE International Transaction on Electrical Machinery and Energy Conversion Systems
    • /
    • v.11B no.3
    • /
    • pp.98-103
    • /
    • 2001
  • This paper presents the numerical analysis of piezoelectric devices using three-dimensional finite element analysis. The characteristic of piezoelectric transducer, such as mechanical displacement and electrical are analyzed and the validity is confirmed by experiments Applying the finite element routine to a piezoelectric transformer, the resonance features electrical impedance. the ratio of step-up voltage and vibration mode of piezoelectric transformer are calculated numerically By using three-dimensional finite element method effects of width variation to resonance features, electrical input impedance and the voltage step-up ratio for a piezoelectric transformer, can be considered in design procedure.

Electromechanical analysis of 2-2 cement-based piezoelectric transducers in series electrically

  • Wang, Jianjun;Shi, Zhifei
    • Smart Structures and Systems
    • /
    • v.14 no.3
    • /
    • pp.267-284
    • /
    • 2014
  • This paper aims to present the analytical solutions of 2-2 cement based piezoelectric transducers in series electrically based on the theory of piezo-elastic dynamics. The solutions of two different kinds of 2-2 cement based piezoelectric transducers under external harmonic load are obtained by using the displacement method. The effects of electrical connection of piezoelectric layers, loading frequency, thickness and distance of piezoelectric layers on the characteristics of the transducers are discussed. Comparisons with other related experimental investigations are also given, and good agreement is found. The proposed 2-2 cement based piezoelectric transducers have a great potential application in monitoring structural health in civil engineering and capturing mechanical energy or monitoring train-running safety in railway system and traffic safety in road system.

Piezoelectric Thin Films for Microtransducer (마이크로 트랜스듀서를 위한 압전 박막 소재 기술 동향)

  • Jung, Soo Young;Baek, Seung-Hyub
    • Ceramist
    • /
    • v.22 no.1
    • /
    • pp.82-95
    • /
    • 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.

Multi-directionally Movable Lambda Shape Transducer for Ultrasonic Motor (초음파 모터용 람다형 다방향 변환자)

  • Do, Young-Soo;Nam, Hyo-Duk;Kim, Young-Duk
    • Journal of the Korean Institute of Electrical and Electronic Material Engineers
    • /
    • v.21 no.2
    • /
    • pp.131-136
    • /
    • 2008
  • The transducer for multi-directionally movable ultrasonic motor having lambda shaped vibrators has been proposed and designed. The two branches cross at a right angle with each other at the tip. FEM analyses of lambda shaped transducer were carried out to find vibration modes for ultrasonic motor. The lambda shaped transducer has one symmetric mode and two anti-symmetric modes. The symmetric mode generates the normal direction motion of the tip. The lateral and vertical direction motion of the tip are excited by two anti-symmetric modes. The normal and lateral direction motions made an lateral elliptic trajectory. And the normal and vertical direction motions made an vertical elliptic trajectory normal to previous one. The transducer with 1 mm in thickness and 25 mm in length has been fabricated and evaluated. The resonance frequencies of the transducer was 32 kHz and 103 kHz. The tangential and vertical vibration displacement of the transducer having the lateral elliptic trajectory were $1.5{\mu}m\;and\;1.1{\mu}m$, respectively at the driving voltage of 100 Vpp and frequency of 32 kHz and 103 kHz. And the tangential and vertical vibration displacement of the transducer having the vertical elliptic trajectory were $0.4{\mu}m\;and\;0.2{\mu}m$, respectively at the same driving condition.