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이종주(Jongju Yi),박경훈(Kyunghyon Pak),정우진(Woojin Jung),서영수(Youngsoo Seo) 한국소음진동공학회 2014 한국소음진동공학회 학술대회논문집 Vol.2014 No.4
This study is on the experiment of the pipe noise due to the internal fluid. The straight pipe, the 90<SUP>0</SUP> mitred pipe, rounded 90<SUP>0</SUP> and 135<SUP>0</SUP> pipe were tested and measured the vibration and noise. In the experiment, the vibration and noise level of the straight pipe and rounded pipes show that the vibration and noise level are almost same. The 90<SUP>0</SUP> mitred pipe shows the high vibration and noise level. In the prediction of noise due to the internal flow, the use of pipe surface vibration and radiation efficiency shows good agreement with experiment result.
수중실험을 통한 원통구조물의 3차원 수중방사소음 패턴 산출기법 분석
이종주(Jongju Yi),강명환(Myunghwan Kang),한승진(Seungjin Han),정현주(Hyunjoo Jeong),오준석(Junseok Oh),배수룡(Sooryong Bae),정우진(Woojin Jung),서영수(Young Soo Seo) 한국소음진동공학회 2014 한국소음진동공학회 논문집 Vol.24 No.11
In this study for the prediction of 3D underwater radiated noise pattern, a comparison between the proposed method(DHIE, Discrete Helmholtz Integral Equation) and the 3D underwater radiated noise calculation results using the measurement of near-field acoustic pressure data is performed. The near-field acoustic pressure in water is measured for the calculation of the far-field radiated noise pattern and the far-field acoustic power. Also the vibration field of the underwater structure is measured in simultaneously. Using the total far-field acoustic power and the vibration field on the surface of the structure, the proposed method(DHIE) can predict the underwater radiated noise pattern of the far-field The predicted results show the reasonable agreement within about 5dB comparing with the experiment result.
배관 표면진동과 방사효율을 이용한 배관 소음예측기법 연구
이종주(Jongju Yi),박경훈(Kyunghoon Park),정우진(Woojin Jung),서영수(Youngsoo Seo) 한국소음진동공학회 2014 한국소음진동공학회 논문집 Vol.24 No.10
This study is on the experiment and prediction of the pipe noise due to the internal fluid. The vibration of pipe external surface and noise in air were measured according to the internal fluid velocity and pipe type. In the experiment, the vibration and noise level of the straight pipe and rounded pipes show that the vibration and noise level are almost same. The 900 mitred pipe shows the high vibration and noise level. In the prediction of noise due to the internal flow, the method using the pipe surface vibration and radiation efficiency shows good agreement with experimental result.
초음속 유동내 원형 2차분사 제트 주변에서의 표면 열전달 현상 연구
이종주(Jongju Yi),유만선(Mansun Yu),조형희(Hyunghee Cho) 한국추진공학회 2007 한국추진공학회지 Vol.11 No.2
Convective heat transfer coefficient was measured around a circular secondary jet ejected into the supersonic flow field. The wall temperature measurement around a injection nozzle was conducted using infra-red camera. The constant heat flux is applied to the wall around a secondary nozzle. According to jet to freestream momentum ratio, the injection flow penetrates into the supersonic flow field. The measured temperature is used to calculate the convective heat transfer coefficient.
수중반사파 환경에서의 근접음장 홀로그래피 적용에 대한 오차 고찰
이종주(Jongju Yi),강명환(Myunghwan Kang),한승진(Seungjin Han),정현주(Hyunjoo Jeong),배수룡(Sooryong Bae),정우진(Woojin Jung) 한국소음진동공학회 2014 한국소음진동공학회 논문집 Vol.24 No.12
Nowadays, it is required for naval ships to estimate 3D underwater radiated noise pattern in all direction at peak frequencies of hull vibration for the reduction of being detected and doing the effective operation. For this purpose, the numerical method has to be developed to calculate 3D underwater radiated noise pattern with experimental data. It is very difficult to obtain the experimental data for the real ship. Alternative to get the experimental results is to use NAH(near-field acoustic holography) in acoustic tank with experimental model. Application of NAH in acoustic tank for the experimental model needs some investigation of reflection wave from the wall of the acoustic tank and unmeasured zone of the experimental model due to the supporting structure for it. In this study, the effect of reflection wave in the acoustic tank and unmeasured area of the experimental model when using the NAH was investigated with experiment and numerical model. From these, it is known for the error due to reflection wave can be reduced when the distance between the measurement plane and source is being shorten. Also, unmeasured area of the experimental model gives rise to some error in the estimation of the far-field acoustic pressure.