• 제목/요약/키워드: Acoustical measurement

검색결과 387건 처리시간 0.026초

전달손실계수 측정 시스템에 대하여 (On the Transmission Loss Measurement System)

  • 류윤선;김윤석
    • 한국소음진동공학회:학술대회논문집
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    • 한국소음진동공학회 2002년도 추계학술대회논문집
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    • pp.166-171
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    • 2002
  • The transmission loss coefficient is very important acoustic property in parallel with absorption and acoustic impedance categorizing the acoustical materials, which can control the acoustical problems. At the same time, the transmission loss coefficient is a key parameter to choose the optimum material for the analysis of acoustical characteristics of material using SEA(Statistical Energy Analysis). In this paper, the transmission loss coefficient measurement system using 4-microphone impedance tube is proposed, based on the idea calculating the full transfer matrix of the acoustical sample to test. The theoretical background and measurement system are introduced, and finally the measurement results are verified.

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전달손실계수 측정시스템에 대하여 (On the Transmission Loss Measurement System)

  • Yunseon RYU;Yoon-Seok KIM;Philippe CALLEC
    • 한국소음진동공학회:학술대회논문집
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    • 한국소음진동공학회 2002년도 추계학술대회논문초록집
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    • pp.323.1-323
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    • 2002
  • The transmission loss coefficient is very important acoustic property in parallel with absorption and acoustic impedance categorizing the acoustical materials, which can control the acoustical problems. At the same time, the transmission loss coefficient is a key parameter to choose the optimum material for the analysis of acoustical characteristics of material using SEA(Statistical Energy Analysis). In this paper, the transmission loss coefficient measurement system usiong 4-microphone impedance tube is proposed, based on the idea calculating the full transger matrix of the acoustical sample to test. The theoretical backgroung and measurement system are introduced, and finally the measurement results are verified.

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전달손실계수 측정 시스템에 대하여(Part II) (On the Transmission Loss Measurement System(Part II))

  • 김윤석;류윤선
    • 한국소음진동공학회:학술대회논문집
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    • 한국소음진동공학회 2003년도 춘계학술대회논문집
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    • pp.658-661
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    • 2003
  • The transmission loss coefficient is very important acoustic property in parallel with absorption and acoustic impedance categorizing the acoustical materials, which can control the acoustical problems. At the same time, the transmission loss coefficient is a key parameter to choose the optimum material for the analysis of acoustical characteristics of material using SEA(Statistical Energy Analysis). In this paper, the transmission loss coefficient measurement system using 4-microphone impedance tube is proposed, based on the idea calculating the full transfer matrix of the acoustical sample to test. The theoretical background and measurement system are introduced, and finally the measurement results are verified.

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세종문화회관 소극장 리모델링을 위한 음향설계 (Acoustical design for remodeling of the Little theatre in Sejong Performing Arts Center)

  • 전진용;이평직;서춘기
    • 한국소음진동공학회:학술대회논문집
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    • 한국소음진동공학회 2007년도 추계학술대회논문집
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    • pp.991-996
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    • 2007
  • The Little theater in Sejong Performing Arts Center is a proscenium theater with 447 seats, which was built in 1978. The remodeling of the theater was decided in 2005 and acoustical design was conducted. Design guidelines were suggested based on the feasibility studies and acoustical measurement results. Target reverberation time was set at 1.2-1.6s with respect to the main performances. For the acoustical design, side balconies were added to increase the level of lateral reflections. Acoustic diffusers were designed and scattering coefficients were measured in a 1:10 reverberation chamber. From the results of computer simulation and a 1:10 scale model measurement, it was indicated that the new space will have RT of 1.2-1.6 s in middle frequencies when fully occupied.

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TL 튜브를 이용한 소음기의 음향 전달 손실 계측법 (Acoustic Transmission Loss Measurement of the Exhaust System with TL Tube)

  • 류윤선;김윤석;이성홍
    • 한국소음진동공학회:학술대회논문집
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    • 한국소음진동공학회 2004년도 춘계학술대회논문집
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    • pp.770-773
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    • 2004
  • The transmission loss coefficient is very important acoustic property in parallel with absorption and acoustic impedance categorizing the acoustical materials, which can control the acoustical problems. At the same time, the transmission loss coefficient is a key parameter to choose the optimum material for the analysis of acoustical characteristics of material using SEA(Statistical Energy Analysis). In this paper, the acoustic transmission loss measurement system using 4-microphone TL tube is applied to the exhaust system, which is one of the most important acoustic control parameters in a car, based on the idea calculating the full transfer matrix. The theoretical background and measurement system are introduced, and finally the measurement results are verified.

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경계 배치법(Boundary Collocation Method)에 의한 근거리 음장 자료로부터 원거리 음장의 예측 ; 최적 측정점 개수의 결정 (Far-Field Sound Field Estimation from Near-Field Sound Field Data Using Boundary Collocation Method ; Decision of Optimum Points of Measurement)

  • 김원호;윤종락
    • 한국음향학회지
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    • 제18권6호
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    • pp.31-37
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    • 1999
  • 본 논문은 근거리 음장 측정 자료로부터 원거리 음장 예측을 위한 기술에 대한 것이다. 음원의 음장 분포 특성은 원거리에서 측정된 자료의 해석으로 이루어지는 것이 일반적 방법이나, 음향수조 또는 무향실과 같은 제한된 공간에서는 근거리 영역에서 측정이 이루어지는 경우가 발생한다. 따라서 근거리 영역에서의 측정으로부터 원거리 음장이 예측되어야 한다. 이 경우 음원을 둘러싼 근거리 음장의 측정점수는 원거리 음장 예측치의 정확도와 자료 처리의 계산량과 상관된다. 기존 연구 결과는 최적측정점수는 음원의 kL에 비례하고 음원의 기하학적 형태 또는 지향특성에 따라 kL의 의존성이 다르게 나타난다고 되어 있으나 정확한 기준이 없다. 따라서 본 논문에서는 최적측정지점수에 대한 기준을 유도하기 위해 Helmholtz 적분식과 Green 함수를 근간으로 한 원거리 음장 예측 기술인 경계배치법(Boundary Collocation Method)을 분석하여 최적측정점수는 kL이 증가함에 따라 0.54kL로 수렴한다는 결과를 얻었다. 기존의 연구 결과 보다 최적측정점수를 1/2 정도로 줄였다.

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