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RISS 인기검색어
- 검색키워드
- 저자 : 김종년(Kim Jong-Nyeun) (검색결과 6 건)
- 무료
- 기관 내 무료
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김종년(Kim Jong-Nyeun),유동호(Yoo Dong-Ho),박경환(Park Kyung-Hwan) 한국철도학회 1998 한국철도학회 학술발표대회논문집 Vol.- No.-
In this paper, the interior noise reduction for subway railroad vehicles was studied by improving transmission loss of carbody panels and side doors, and on-line tests were conducted to examine the exterior noise levels at various running conditions. Also the transmission loss for design candidates of the carbody specimen was measured in two reverberation rooms. From the results of the tests, side door gap is the most dominant factor affecting the interior noise level of subway railroad cars with a sliding typed side door. The next one is revealed to transmission loss of a floor panel. To improve the transmission loss of the carbody, many activities were conducted such as, treatment of resilient and sound-absorbing materials and reducing the gap of the side door by adopting a brush and rubber, etc. The estimated interior noise level for modified car which is designed with improved carbody panels is lower than original car by about 5㏈.
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난간 벽이 있는 고가선로를 운행하는 열차의 외부소음 해석
김종년(Kim Jong Nyeun),박희준(Park Hee Jun) 한국철도학회 2006 한국철도학회 학술발표대회논문집 Vol.- No.-
The dominant contributors to the wayside noise are wheel/rail interaction noise and propulsion noise when railway vehicles are running on the open ground. Although there are no big obstacles between source and receiver position for the running on typical open section track, parapet walls should be considered to estimate external noise when running on the elevated track. In that case the sound from the train can not directly be propagated and is therefore diffracted to the receiver position. Simple diffraction formulas have not fully described such complicated diffraction of the reflected noise in space between railway car and infrastructure. In this paper, simple modeling method using "virtual source" has been proposed to overcome the gap between the diffraction theory and practical situation. Virtual source can be defined a sound source positioned between railway car and parapet wall. Its source strength can be easily calculated by other commercial software using ray tracing technique. Reasonable agreement is achieved through the experimental validation of the proposed modeling method.
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철도차량용 방진고무의 동특성 평가 및 상구조 차음 성능 증대를 위한 적용
이태욱(Lee Tae Wook),김종년(Kim Jong Nyeun),이화수(Lee Hwa Soo) 한국철도학회 2004 한국철도학회 학술발표대회논문집 Vol.- No.-
Floating floor structure, which is mainly adopted for reducing interior noise of railway vehicle, is known that it is superior to single wall in respect of sound transmission loss. The dynamic characteristic of the support in the floating floor that is one of the important design variables in floating floor structure can change the sound and vibration insulation properties of it. From excitation test, the dynamic stiffness and loss factor of the support are evaluated. They are used as input parameter for analyzing the sound transmission loss of floating floor. Predicted transmission loss is compared with the prototype-car test results.
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이화수(Lee Hwa-Soo),김종년(Kim Jong-Nyeun) 한국철도학회 2005 한국철도학회 학술발표대회논문집 Vol.- No.-
The dominant noise sources of Diesel Multiple Units are powerpack, which is composed of engine, transmission and cooling system, noise and wheel-rail rolling noise. The interior noise of a running vehicle is determined by structure-borne noise and air-borne noise from these noise sources. The contributions of interior noise from each noise source are calculated by air-borne transfer functions and structure-borne transfer functions of noise sources. In this paper, source separation technique is proposed to determine these transfer functions from the results of stationary and running tests of existing vehicle. With this technique, it is possible to get hold of contributions of interior noise from noise sources of running vehicle. This source separation technique makes it possible to take efficient measures for reduction of interior noise at the early car-development stage.
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철도차량 부유상구조의 Floor support 재질이 차량 실내소음에 미치는 영향에 관한 연구
손병구(Son Byoung-Gu),김종년(Kim Jong-Nyeun),우관제(Woo Kwan-je) 한국철도학회 2008 한국철도학회 학술발표대회논문집 Vol.- No.-
To reduce interior noise of running vehicles, a floating floor construction has been widely used in recent railway industry. Among the key factors of the floating floor design, dynamic stiffness is of most important in acoustical point of view. Sometimes hard rubber type supports have often been selected due to the other design constraints such as heavy load condition, durability of rubber element and its cost etc., even though it seems like the softer support, the better isolation of noise and vibration. In this paper two representative floor supports have been considered to evaluate their effectiveness in interior noise contribution: one is a soft rubber and another is a relatively hard one. From the measured dynamic stiffness of the specimens, equivalent stiffness of actual floating floor has been derived to use in the analytical models. Calculated air-borne and structure-borne noise insulation properties of the floating floors have been compared with experiments in prototype car. In full car model interior noise levels of running vehicles have been predicted to quantify the effectiveness of the two different floating support materials and verified through the measured inside noise levels of actual train as well. By comparison with difference of running noise levels two materials for floor support can be investigated quantitatively so that it could be applied in floating floor design.
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시험적인 통계적 에너지 기법(ESEA)을 적용한 진동 전달 특성 연구
이화수(Lee Hwa-Soo),우관제(Woo Kwan-Je),김종년(Kim Jong-Nyeun),이태욱(Lee Tae-Wook) 한국철도학회 2002 한국철도학회 학술발표대회논문집 Vol.- No.-
Vibrational characteristics of coupled beam & plate system are considered on simple system, which consists of plates(2-subsystem) and beams(4-subsystem), using experimental statistical energy analysis(ESEA). First, damping and coupling loss factors of the system are determined by power injection method (PIM). Then, energy distribution of all the subsystem is estimated from the power balance equation. Finally, these quantities are compared with measured energy. The correlation of measured and estimated results for the sample problem is reasonably good.
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