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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.
스피커를 이용한 400km/h급 고속철도 소음저감용 방음벽 상단장치의 음향성능 시험방법에 관한 연구
윤제원(Je-Won Yoon),김영찬(Young-Chan Kim),장강석(Kang-Seok Jang),엄기영(Ki-Young Eum),장승호(Seung-Ho Jang) 한국소음진동공학회 2014 한국소음진동공학회 학술대회논문집 Vol.2014 No.4
For the purpose of the acoustic performance evaluation of noise reduction device(NRD) installed at the top of noise barrier for further decreasing of noise level of 400km/h class high-speed railroad(HEMU), the acoustic performance test method using speaker instead of really running railway vehicle was suggested in this paper. For this, noise source location and frequency spectrum of HEMU was analyzed through the field noise test. These data were used for the determination of speakers installation positions and frequency correction values applied to the speaker noise source. And, 400 meters long NRD was installed at the site where HEMU will be running at a speed of 400km/h. Finally, the outdoor speaker test with and without NRD showed that this NRD could decrease noise level even more than 3dB(A). In the future, the acoustic performance results of NRD conducted with speaker test will be compared with that of field test for HEMU running at a speed of 400km/h.
축소모형 방음벽 상단장치의 성능예측 및 평가에 관한 연구
윤제원(Je-Won Yoon),김영찬(Young-Chan Kim),장강석(Kang-Seok Jang),홍병국(Byung-Kook Hong) 한국철도학회 2011 한국철도학회 학술발표대회논문집 Vol.2011 No.10
The purpose of this study is to set up an acoustic prediction technique and to perform the IL test of scale down noise reducing device for the development of the noise reducing device as the development of 400km/h class high speed train. First of all the IL prediction of noise reducing device was performed with the 2D BEM method. And the noise test of scale down noise reducing device in anechoic chamber was performed for the verification of acoustic prediction technique and IL performance evaluation. As the results the acoustic prediction technique for the development of noise reducing device was verified because the averaged IL difference between prediction and test is in 2dB(A). And the measured IL value of noise reducing device is less than 2dB(A) and additional IL with polyester absorption material is increased about 0.5dB(A).
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.