The Journal of the Acoustical Society of Korea (한국음향학회지)

The Acoustical Society of Korea (한국음향학회)
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Estimation of the thickness of refractory ceramics using the impact-echo method

충격반향기법을 이용한 내화물 두께 추정

  • Received : 2017.03.17
  • Accepted : 2017.07.31
  • Published : 2017.07.31
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Abstract

Generally, the vibration characteristics of refractory ceramics are identified by assuming them as isotropic materials. However, in practice, refractory ceramics exhibit anisotropic properties as they are manufactured by pressing ceramic powders along a particular direction. Therefore, in this research, the frequency responses of a refractory ceramic brick along its width, length, and height directions were acquired using finite element analysis by assuming that the ceramics had tetragonal symmetry in their material properties. The validity of the numerical analysis results was verified by comparing them with those from experimental measurements. Based on the frequency response, the thicknesses of the refractory brick along three different directions were estimated using the impact-echo technique. The maximum difference between the estimated and actual thicknesses was observed to be less than 5 %. This result confirms the effectiveness of the impact-echo technique along with anisotropic property characterization to evaluate the thickness of the refractory ceramic.

일반적으로 내화물의 진동특성은 등방성 재료로 가정한 후 확인한다. 하지만 실제로 내화물은 특정 방향으로 가압 성형하여 제조되기 때문에 이방성 재료특성을 보인다. 따라서 본 연구에서는 내화물을 정방정계 대칭성으로 가정하고, 유한요소프로그램을 이용해 너비, 길이, 높이 방향에 대한 주파수 응답을 얻었다. 해석결과의 타당성은 실제 측정결과의 비교를 통해 검증하였다. 주파수 응답을 기반으로, 충격방향기법을 이용하여 내화벽돌의 세 방향의 두께를 추정하였다. 실험을 통해 찾은 두께와 실제 두께와의 최대 오차율은 5 % 미만으로 확인되었다. 이를 통해 내화물과 같은 이방성 재료 두께 측정 시 충격반향기법의 효용성을 확인하였다.

Keywords

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