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2015 Vol.34, Issue 3 Preview Page
A Study on the Effect of a Gap in Measurement of Underwater Transmission Loss by Pulse Tube

펄스 튜브를 이용한 수중 전달 손실 측정에서간극이 미치는 영향에 대한 고찰

Yun-Ho Seo1*
,
Sang-Ryul Kim1
,
Jae-Seung Kim1
,
Yang-Heon Byun2
,
Youngsoo Seo3
서 윤호1*
,
김 상렬1
,
김 재승1
,
변 양헌2
,
서 영수3
1Korea Institute of Machinery & Materials (KIMM)
1한국기계연구원 음향소음팀
2화승R&A
3국방과학연구소
*교신저자. *Corresponding Author. 
31 May 2015. pp. 192-199
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Abstract

There is a gap between the inner wall of a pulse tube and an underwater acoustic material when the measurement for transmission loss by the pulse tube is carried out. In this paper, the effect, which is caused by the gap, for the measurement of transmission loss is analyzed. Transmission coefficient is derived from the ratio of the pressures between front and rear of the gap. Then, transmission loss for specimen with a gap is obtained by combining the transmission coefficients of the gap and specimen. The results of experiment and simulation for a specimen of stainless steel with 10 mm thickness are compared in order to evaluate the simulation model. Finally, simulations with respect to the gap size and transmission loss of a specimen are performed to analyze and evaluate the effect of the gap in measurement of transmission loss.

Keywords
Underwater acoustic material
Pulse tube
Transmission coefficient
Transmission loss
Gap

펄스 튜브를 이용하여 시편의 전달 손실 성능을 측정할 경우, 시편 설치를 위해 필연적으로 시편과 펄스 튜브 내벽 사이에 간극이 존재한다. 본 논문에서는 이와 같은 간극이 전달 손실 측정 결과에 미치는 영향에 대해 평가했다. 평면파에 대해 일정 폭 및 길이를 갖는 간극 전과 후 음압의 비를 구하여 전달 계수를 유도하고 측정 대상 시편의 전달 계수와 조합하여 간극이 포함된 시편의 전달 손실을 구했다. 이와 같은 해석 모델을 이론해가 존재하는 10 mm 두께의 스테인리스 스틸 시편에 적용하여 시험 결과와 비교함으로서 해석 모델의 적절성을 보였다. 마지막으로 해석 모델을 통하여 간극크기 및 시편 전달 손실 성능에 따라 전달 손실 측정에 미치는 영향을 분석했다.

키워드
수중 음향 재료
펄스 튜브
전달 계수
전달 손실
간극
References
1
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Information
  • Publisher :The Acoustical Society of Korea
  • Publisher(Ko) :한국음향학회
  • Journal Title :The Journal of the Acoustical Society of Korea
  • Journal Title(Ko) :한국음향학회지
  • Volume : 34
  • No :3
  • Pages :192-199
  • Received Date : 2014-09-26
  • Revised Date : 2014-11-09
  • Accepted Date : 2015-04-27
  • DOI :https://doi.org/10.7776/ASK.2015.34.3.192
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