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장승호(Seungho Jang),고효인(Hyoin Koh),박병주(Byoungju Park) 한국철도학회 2013 한국철도학회 학술발표대회논문집 Vol.2013 No.5
철도소음으로 인한 환경공해 문제를 예방하고 대책을 수립하기 위해서는 정확한 소음 예측 모델이 필요하다. 국내에서는 총합 소음도의 거리별 경험식에 기초한 철도소음 예측모델이 이용되고 있으나 다소 많은 오차를 내고 있어 개선이 요구된다. 본 논문에서는 소음원의 옥타브 밴드 주파수별 음향 파워와 지형 특성을 고려한 소음 전파 모델을 이용한 철도소음 예측모델을 제안하였다. 본 예측모델은 높이별로 위치한 소음원 음향 파워와 속도 계수, 궤도 및 교량 조건에 따른 보정값으로 구성되었다. 본 모델과 기존 모델로 예측한 속도별 소음도를 비교하였다. In order to solve the problem due to the railway noise, an accurate noise prediction model is required. Domestic prediction model based on the overall sound pressure level has resulted in relatively large errors. In this paper, a noise prediction model considering the octave band source powers and the various ground effects has been proposed. In the model the sources are presumed as being located at different heights and the speed parameters, correction values for the track and bridge condition are utilized. The noise levels at different running speeds predicted by the present model are compared with the existing model.
유원희(Wonhee You),고효인(Hyoin Koh),박준혁(Joonhyuk Park),조준호,양칠식(Chilsik Yang) 대한기계학회 2008 대한기계학회 춘추학술대회 Vol.2008 No.11
The subway noise in curved line is affected not only by rail condition but also wheel condition and dynamic characteristics. The railway curving noise can be divided into 2 categories. The first is noise depending on the vehicle speed, and the second is the one independent on vehicle speed. In this study the noises were reviewed by using eigen-mode of wheel and waterfall plot which shows noise level in time-frequency domain. And also those were reviewed in viewpoint of stick-slip noise and wheel flange contact noise.
박준혁(Joonhyuk Park),고효인(Hyoin Koh),허현무(Hyunmoo Hur),유원희(Wonhee You),김남포(Nampo Kim) 대한기계학회 2009 대한기계학회 춘추학술대회 Vol.2009 No.11
Unstable vibrations of railway vehicle wheels generate the curve squeal noise in tight curve. This squeal noise has to be reduced in order to increase the service quality of railway system by eliminating the main factors that make the wheel unstable. In this paper, main parameters which affect the stability of railway vehicle wheel are introduced and the stability analysis is carried out using those parameters in frequency domain. Time domain analysis is also performed. In the time domain analysis, using a conventional Korean subway vehicle model, transient time response of a wheel is analyzed when the vehicle is running in curved track. Finally, the results are compared and discussed.