The Journal of the Acoustical Society of Korea (한국음향학회지)

The Acoustical Society of Korea (한국음향학회)
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Estimation of Characteristics Change on Transverse Mode PZT Vibrator Under Space Environment

우주환경하에서 횡진동 모드 PZT진동자의 특성변화 예측

  • Received : 2012.06.27
  • Accepted : 2012.08.11
  • Published : 2012.11.30
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Abstract

The temperature dependence of the characteristics in a PZT-5 piezoelectric ceramic vibrator with the transverse mode was investigated in the range of $-100^{\circ}C$ to $90^{\circ}C$ using a thermal vacuum chamber to utilize the vibrator in aerospace industries. As the results, at room temperature, the resonant and anti-resonant frequencies had the minimum value, whereas, the dielectric constant increased linearly from about 2500 to 7500 in the given temperature range. The mechanical loss decreased linearly from 0.08 to 0.03. Through the regression analysis, the temperature dependence functions of the characteristics were derived to linear and square regression functions. Applying the functions, the input admittance characteristics of the piezoelectric vibrator were calculated, and the results showed good agreement with measured ones. It can be confirmed that this method is useful to estimate the characteristics change of the piezoelectric vibrator caused by the temperature change under the space environment.

횡진동 모드 압전진동자의 우주-항공산업에의 적극적인 활용을 위하여 우주환경을 모사한 열진공 챔버를 사용하여 $-100^{\circ}C{\sim}90^{\circ}C$의 범위에서 PZT-5계열의 압전세라믹 진동자의 온도변화에 따른 특성변화를 조사하였다. 그 결과 공진 및 반공진주파수는 상온일 때를 중심으로 온도의 변화에 따라 증가하였고 유전상수의 경우 주어진 온도 범위에서 2500~7500의 범위에서 선형적으로 증가하였다. 기계적 손실은 0.08~0.03의 범위에서 선형적으로 감소하는 경향을 보였다. 이들에 대한 회귀분석을 통하여 1차원 및 2차원 회귀함수를 이용하여 압전진동자의 각 특성에 대한 온도의존함수들을 도출하였다. 이들 함수를 적용하여 구한 횡모드 압전 진동자의 입력어드미턴스의 계산결과는 측정결과와 좋은 일치를 보이고 있었으며 우주환경에서의 온도에 따른 특성변화 예측에 유효함을 확인할 수 있었다.

Keywords

References

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