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환경소음 저감을 위한 디퓨저가 장착된 분출형 소음기의 음향특성
윤제원(Je-Won Yoon),이주원(Joo-Weon Lee),조용성(Yong-Thung Cho) 한국산학기술학회 2024 한국산학기술학회논문지 Vol.25 No.1
This study was undertaken to analyze the noise-reducing performance and back pressure characteristics of a diffuser fitted to a vent silencer used to reduce environmental noise when gas is vented at a power plant under conditions where the critical pressure ratio exceeds the threshold. After constructing an experimental device using an air compressor, the acoustic characteristics of the diffuser were measured and compared with a perforated plate. It was found that when gas was vented and the pressure ratio exceeded the threshold, the noise generated had a high-frequency component of 4~8 kHz and that when it had the same porosity, the noise level was high when the hole diameter was large. In addition, the diffuser had a back pressure of around 1/5 of that of the perforated plate. Therefore, when designing a vent silencer to reduce vent noise, a diffuser silencer with a small hole diameter would be expected to enable more effective noise control. In addition, it was confirmed that the back pressure can be calculated using a simple equation for a perforated plate when the back pressure is relatively large.
400㎞/h급 고속철도 소음저감용 방음벽 상단장치 개발에 관한 연구
윤제원(Je Won Yoon),김영찬(Young Chan Kim),장강석(Kang Seok Jang),홍병국(Byung Kook Hong),엄기영(Young-Ki Eum) 한국소음진동공학회 2013 한국소음진동공학회 학술대회논문집 Vol.2013 No.4
본 연구의 목적은 400㎞/h 급 고속철도 소음저감용 방음벽 상단장치를 개발하기 위함이다. 이를 위해 우선 현장에서의 소음측정을 통한 400㎞/h 급 고속철도(HEMU) 및 300㎞/h 급 KTX의 주파수특성을 분석하였다. 그리고, 해석적 기법(BEM) 및 시작품 제작을 통한 실내실험을 수행하여 3dB(A) 이상의 소음을 저감시킬 수 있는 상단장치를 설계하였다. 마지막으로, 상단장치 시작품을 제작하여 옥외실험에서의 성능시험을 수행하였으며, 고속철도의 주파수특성을 반영한 상단장치 설치 전후의 감음량을 평가하였다.
윤제원(Je-Won Yoon),김영찬(Young-Chan Kim),김금모(Keum-Mo Kim),장강석(Kang-Seok Jang),구본성(Bon-Sung Ku),엄주용(Joo-Yong Eom) 한국소음진동공학회 2011 한국소음진동공학회 학술대회논문집 Vol.2011 No.10
The purpose of this study is to develop an air-passing soundproofing panel with more improved structure to reduce the CO2 emission and installation cost. To reduce the emission of CO2 ; it is suggested to choose low CO2 emission material relative to the aluminum and to reduce the materials by developing a specially designed air-passing soundproofing panel structure. First of all, we performed the flow analysis to predict the wind pressure according to the open angle of the air-passing soundproofing panel and the noise level analysis at the receiver point. To verify the simulation, a prototype of the soundproofing panel was made. The flow test in the wind tunnel and load test were performed. The economic evaluation for the installation of the air-passing soundproofing panel was performed and specifications of the installation was prepared. As the results of this research, it was verified that the wind load was reduced about 40% to that of the conventional one at 25m/s wind speed in the wind tunnel test. By applying the 4m span soundproofing wall with air-passing soundproofing panel and under the cost of 250 thousand won/m2 instead of the conventional 2m span panel, the installation cost will always be lowered than the conventional one in the combination of (60:40~50:50) conventional to air-passing soundproofing panel from the economic evaluation. The 20% reduction of CO2 was found by changing the 50% of aluminum soundproof panel to air-passing soundproofing panel.
윤제원(Je-Won Yoon),김영찬(Young-Chan),심상덕(Sang-Deok Sim),구본성(Bon-Sung Ku),엄주용(Joo-Yong Eom) 한국소음진동공학회 2011 한국소음진동공학회 학술대회논문집 Vol.2011 No.4
The aluminum soundproofing panel used to the traffic noise reduction will judge with the material to improve because the CO2 emission is greater than other soundproofing panel such as plastic soundproofing panel. Also, if the air-passing soundproofing panel which can endure the fast wind velocity will be developed, it judged that it can reached to the target of low CO2 traffic technology development using the reduction of material cost and the lower consumption of steel. The objective of this study is to improve the soundproofing panel and to develop the air-passing soundproofing panel for the replacement of aluminum sound proofing panel which is more emit CO2 than other soundproofing panel. And, we tried to develop the reduction technology of CO2 emission through the development of air-passing soundproofing panel. At first, the flow and noise simulation were conducted for the purpose of the calculation of wind pressure on soundproofing wall and noise exposure level on receiver points according to the open ratio of air-passing soundproofing panel. And the 1<SUP>st</SUP> and 2<SUP>nd</SUP> mockup of air-passing soundproofing panel were made, and the design load test were conducted for these mockup.