• Proceedings of the Korean Society for Noise and Vibration Engineering Conference
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• 2013.10a
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• pp.397-398
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• 2013

• Journal of KSNVE
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• v.6 no.1
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• pp.20-23
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• 1996

우리나라와 일본의 건축음향 및 소음.진동분야의 상호 발전을 도모하고 관련 전문가의 교류 및 협력을 목적으로 한국소음진동공학회, 대한거축학회 및 일본음향학회가 공동 주최하고 대한주택공사와 삼성건설이 후원한 한.일 건축음향 및 소음.진동 세미나가 1995년 12월 8-9일 이틀간 삼성건설 국제회의실에서 개최되었다. 첫째날에는 일본 비도건설의 염용정순과 녹도건설의 안등계이 "일본에 있어서의 연구시설 동향"에 대한 특별강연이 있었으며, 두번째날에는 한국측에서 4편, 일본측에서 6편 등 총 10편의 논문이 발표되었다. 본 세미나에는 우리나라의 학계, 산업계 및 연구기관의 관련 전문가 약 90여명, 일본측에서는 일본음향학회 건축소음분과위원회 암뢰소웅 위원장과 소음.진동분과위원회 고목흥일 위원장 및 회원 13명이 참석하였으며, 논문이 발표될 때마다 열띤 토론이 전개되었다. 이 글에서는 본 세미나에서 발표된 논문들을 요약 정리한 것이다.약 정리한 것이다.

• Transactions of the Korean Society for Noise and Vibration Engineering
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• v.26 no.2
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• pp.141-147
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• 2016

Underwater cavitation is one of the most important issues because it causes not only vibration and erosion of submerged bodies but also significant flow noise problems. In this paper, flow noise due to cavitation flows around the NACA66 MOD hydrofoil is numerically investigated. The cavitation flow simulation is conducted using the Reynolds-Averaged Navier-Stokes equations based on finite difference methods. To capture the cavitation phenomena accurately and effectively, the homogeneous mixture model with the Merkle's cavitation model is applied. The predicted results are compared with available experimental data in terms of pressure coefficients and volume fraction, which confirms the validity of numerical results. Based on flow field analysis results, hydro-acoustic noise field due to the cavitation flow is predicted using the Ffowcs-Williams and Hawkings equation derived from the Lighthill's acoustic analogy. The typical lift dipole propagation patterns are identified.

• Proceedings of the Korean Society for Noise and Vibration Engineering Conference
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• 2006.11a
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• pp.5-10
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• 2006

This study aims to propose appropriate evaluating method of noise emission from water supply and drain installations in apartment bathroom. Because KS(Korean Standard) about water installations noise in apartment bathroom only are establishing the measurement procedure of it, Evaluation and rating procedure is necessary to improve the sound insulation performance of the apartment and to reduce the apartment dweller's unsatisfaction with the noise. Thus, this study reviewed the standards and evaluating methods about the water supply and drain installations noise of many other country. We measured the noise emission from the installations in many apartment bathroom, and then we calculated the noises to dB(A), N, NC evaluated numbers. We analyze the coefficient of the corelation among the evaluated numbers to induce the appropriate method. As a result, the dB(A) method is most easy to evaluateing and very high corelated wth N and N index, So the dB(A) method is suitable to be adopted KS evaluating procedure of noise emission from water installations in apartment bathroom.

• Transactions of the Korean Society for Noise and Vibration Engineering
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• v.22 no.7
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• pp.676-684
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• 2012

Numerical analysis was performed to investigate the heavy-weight impact noise of apartment houses. The FEM is practical method for prediction of low-frequency indoor noise. The results of numerical analysis, the shape of the acoustic modes in room-2 are similar to that of acoustic pressure field at the fundamental frequency of acoustic modes. And the acoustic pressure was amplified at the natural frequency of the acoustic modes and structural modes. The numerical analysis result of sound pressure level at 63 Hz and 125 Hz octave-band center frequency are similar to the test results, but at 250 Hz and 500 Hz have some errors. Considering most of bang-machine force spectrum exists below 100 Hz, the noise at 250 Hz and 500 Hz are not important for heavy-weight impact noise. Thus, the FEM numerical analysis method for heavy-weight impact noise can apply to estimate heavy-weight impact noise for various building systems.

• Journal of the Society of Naval Architects of Korea
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• v.44 no.4
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• pp.408-416
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• 2007

This paper summarizes an experimental study on the marine propeller BPF noise. The main objective of this study is to show the worthiness of the noise measurement at the MOERI middle size cavitation tunnel and to acquire useful propeller noise data. Background noise of MOERI(Maritime and Ocean Engineering Research Institute) cavitation tunnel is experimentally analyzed. Experiment carried out in the MOERI cavitation tunnel with wake screen or dummy body, which is simulated the wake. Propeller BPF noise is measured under various operating conditions. In order to secure the reliance of measured propeller noise dada, background noise of each operating conditions are measured and analyzed. The noise characteristics are analyzed according to the operating condition.

• Proceedings of the Korean Society for Noise and Vibration Engineering Conference
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• 2009.10a
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• pp.716-722
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• 2009

4000MW급 유연탄발전소는 기존 500MW급 4기의 발전설비 운영조건에서 지역공동체는 긍정적이었으나, 500MW급의 증설 호기가 늘어나면서 지역 공동체는 발전소 증설과 관련하여 기존 동쪽 부지 경계지역의 소음환경에 대하여 부정적인 문제를 제기하였다. 2000MW급 증설이 진행되어온 4000MW급 발전소의 다양한 소음원에 의한 소음파워 증대와 증가방출 과도소음 에 대하여 고저가 다양한 주변지역에 미치는 영향음 평가하고자 3차원 모델링기법을 적용한다. 기존호기를 비롯한 전체의 발전소 전면부 소음원응 비교 시험결과 증가방출 소음 파워가 기존 설계의 변경 제작되어 기존호기에 비해 20~30dBA 높아져 동시 방출사 주변지역에 과도하게 영향을 미치는 상태였으며 500MW급 4기를 추가 증설에 따라 일상소음원에 의한 소음 영향도 증설전 대비 2~3dBA 증가된 것으로 평가되었다. 따라서 증설호기의 과도 소음원 제거 방안으로 대가 방출증가가 회수되도록 증설호기의 증가방출설비를 개선하였고, 증설에 의하여 증가된 소음 영향음 저감하고자 기존 경계지역에 미치는 소음원음 고려하여 방음벽음 설치한 결과 47 ~ 49dBA를 나타내고 인근 주거건물의 전면부 소음은 43dBA이었다.

• Rubber Technology
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• v.17 no.1_2
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• pp.34-50
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• 2016

• The Journal of the Acoustical Society of Korea
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• v.9 no.3
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• pp.66-74
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• 1990

• The Journal of the Acoustical Society of Korea
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• v.12 no.6
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• pp.77-84
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• 1993