• 제목, 요약, 키워드: Interior noise

검색결과 521건 처리시간 0.044초

주파수 응답 함수를 이용한 철도차량 실내소음 기여도 분석 및 분포도 측정 (Analysis of Noise Contribution using Frequency Response Function and Measurements of Noise Distribution for Railway Interior Noise)

  • 김재철;유원희
    • 소음진동
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    • v.9 no.5
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    • pp.949-954
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    • 1999
  • Speed-up and mass reduction of railway vehicle usually causes increased of the interior noise. One of the best ways to control the interior noise is to identify the noise level radiated from each of parts in the cabin. In this paper, we describe the method to estimate the interior noise nad evaluate the noise contribution to each of parts. This method is based that the sound pressure can be calculated by using the frequency response function and acceleration. According to analysis of the noise contribution, we validated that the noise radiated from the floor is the higher in the cabin. We also measured the noise distribution for the side and floor by using the microphone array in order to analyze the effect of the noise flowing into the cabin from the outdoors. Finally, we presented the plan of the interior noise reduction based on the noise levels radiated from each of parts.

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기여도 분석에 의한 전기동차 실내소음 저감대책 연구 (A Study on the Interior Noise Reduction of EMU by Contribution Analysis)

  • 문경호;김재철;유원희
    • 한국철도학회:학술대회논문집
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    • pp.218-225
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    • 1999
  • Speed-up and mass reduction of EMU(Electrical multiple unit) causes increase of interior noise. One of the best ways to reduce the interior noise is to identify noise sources. In this study, we evaluated interior noise by contribution analysis. This method is to predict the interior noise contribution of carbody by using transfer function between acceleration and sound pressure. The plan of the interior noise reduction based on the test results was also presented.

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콘크리트 궤도 터널 내 KTX 차량의 실내소음 특성 분석 (Analysis of Interior Noise for KTX in Tunnel with Concrete Track)

  • 김재철;이찬우
    • 한국소음진동공학회:학술대회논문집
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    • pp.25-28
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    • 2005
  • The interior noise of KTX in tunnel is becoming the problem since the commercial operating in April 2004. The major sources of interior noise for High speed train ate known as the aerodynamic noise and rolling noise generally. We measure the noise and vibration inside KTX in tunnel in order to find the cause of the interior noise of KTX. The analysis results show that the interior noise of KTX in tunnel with concrete track is increased sharply by a low frequency below 80Hz that is the natural frequency of the KTX carbody. We know that the booming noise inside KTX in tunnel with concrete track is generated by aerodynamic noise outside ganqway and rolling noise at the carbody natural frequency.

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콘크리트 궤도 터널 내 KTX 차량의 실내소음 특성 분석 (Analysis of Interior Noise of KTX in Tunnel with Concreted Track)

  • 김재철;이찬우
    • 한국소음진동공학회논문집
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    • v.17 no.11
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    • pp.1037-1042
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    • 2007
  • KTX trains show a high interior noise level in tunnel with concreted track at 300 km/h. Generally, the concreted track has higher sound emissions compared with ballasted track due to the reduced absorption and the major sources of interior noise for KTX are known as the aerodynamic noise and rolling noise. Therefore, It is necessary to find out noise source and noise components to affect interior noise in tunnel with concreted track. In this study, we measure the noise and vibration inside KTX in tunnel in order to find the cause of the interior noise of KTX. The analysis results show that the interior noise of KTX in tunnel with concreted track is increased sharply by a low frequency below 80 Hz. We know that the low frequency noise inside KTX in tunnel with concreted track is generated at the natural frequency of carbody by aerodynamic noise outside gangway and rolling noise. In order to reduce the noise level at 80 Hz, modification of mud-flap length between carbodys is suggested and the effect of noise reduction is examined in tunnel with concreted track.

파워트레인에 의한 차량 실내 소음 특성 및 전달 함수 측정 (The Analysis of Vehicle Interior Noise by the Powertrain, and Measurement of Noise Trasnsfer Function using Vibro-Acoustic Reciprocity)

  • 김성종;이상권
    • 한국소음진동공학회:학술대회논문집
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    • pp.501-506
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    • 2007
  • Structure-borne noise is the interior noise that results from the low frequency vibrational energy transmitted through those body and joint parts. The relation between the excitation of powertrain and resultant interior sound must be analyzed in order to identify and predict the structure borne noise. The method of acoustic source excitation is preferred than the method of mechanical force excitation to measure the NTF(noise transfer function). Because acoustical method is more convenient and reliable. In this paper, to analysis and identify vehicle interior noise by powertrain is performed, and the vibro-acoustic transfer function is extracted from experimental measurement. These are important step of TPA(transfer path analysis) to identify effect of interior noise resulted from powertrain running excitation.

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음선추적법과 통계적 에너지 분석법을 이용한 철도차량 실내 소음 해석 (Noise Prediction of Train Using Ray Tracing Method and Statistical Energy Analysis)

  • 박희준
    • 한국철도학회:학술대회논문집
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    • pp.942-946
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    • 2010
  • As the major sources of interior noise of train at running condition are the wheel/rail contact noise, the traction motor's noise and the driving gear's noise and these noise sources are transmitted through the car body, the noises of HVAC and air duct can be ignored. But the interior noise of train at standstill condition is decided by HVAC's noise and noise from the diffuser through the air duct. the interior noise prediction of train at standstill condition should be performed considering the shape of air duct, the air velocity and noise reduction property inside the air duct. But it is hard to estimate the interior noise level by the numerical method. Therefore train maker predict the interior noise level using The commercial noise prediction program. This paper introduce the noise prediction method of the train at standstill condition using the commercial program appling the ray tracing method and statistical energy analysis.

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고속철도의 실내 음질평가와 음질인덱스 개발 (Sound Quality Evaluation and Development of Sound Quality Index for High-Speed Train Interior)

  • 박범;최성훈;박준홍
    • 한국소음진동공학회:학술대회논문집
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    • pp.827-827
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    • 2009
  • Complaints against high-speed train interior noise have been increasing as a number of high-speed train passenger grows bigger. It is very difficult to analyze characteristics of high-speed train interior noise using sound pressure level only. It is requested to consider how the public response change for each high-speed train interior noise. This study presents evaluation of the sound quality for interior noise of KTX-II using Zwicker parameters. Characteristic of loudness and sharpness is different between noise samples depending on operation condition. The noise sample that recorded when the high-speed train passed through tunnel section is more louder and sharper.

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주행중 차실 내부 소음의 평가 (Objective Evaluation of Vehicle Interior Noise in Operation)

  • 정혁;이정권
    • 한국소음진동공학회:학술대회논문집
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    • pp.47-52
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    • 1996
  • Interior noise, engine speed and vehicle speed are measured under road-load condition and interior noise signal is transformed by using the transient signal analysis methods such as the spectrogram and wavelet transform. Using the analyzed results, subjective noise criteria such as the loudness, noisiness and articulation index at each vehicle speed can be estimated and characteristics of interior noise for various running mode can be discussed in the viewpoint of noise quality.

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고속철도 차량의 실내소음 특성 연구 (A Study on Interior Noise Characteristics of High-speed Trains)

  • 노희민;최성훈;김석원;홍석윤
    • 한국철도학회논문집
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    • v.16 no.1
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    • pp.14-19
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    • 2013
  • 고속철도차량의 실내소음은 승객에서 불쾌감, 피로감 및 스트레스를 유발하는 요인으로 이에 대한 지속적인 연구가 필요하다. 특히, 고속철도 차량이 개활지와 터널 등 다양한 주행환경에서 운행되고 있는 우리나라 현실에서는 이러한 환경에서의 실내소음 변화에 대한 구체적인 연구가 필요하다. 따라서, 본 연구에서는 현재 우리나라에 운영되고 있는 고속철도 차량에 대한 실내 소음의 특성을 분석하는 연구를 수행하였다. KTX와 KTX-산천 차량의 실내에 마이크로폰을 설치하여 주행 시 발생하는 실내소음을 분석하였으며, 축상, 대차 및 차체 가속도 센서를 설치하여 구조기인의 원인이 되는 진동을 검토하였다. 본 연구를 통해서 고속철도 차량의 속도에 따른 실내소음의 특성이 도출되었으며, 주행 환경이 실내소음에 미치는 영향을 개활지와 터널주행 시 발생하는 실내소음의 차이를 통해서 검토하였다. 또한, 차체진동과 실내소음에 대한 전달함수분석을 통해서 차체진동이 실내소음에 미치는 영향을 검토하였다.

국내 여객열차 실내소음 평가 (The Evaluation of Interior Noise for Domestic Trains)

  • 문경호;유원희;김재철
    • 한국소음진동공학회:학술대회논문집
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    • pp.1241-1246
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    • 2001
  • In this study, we measured and analyzed the interior noise, the rolling noise and the engine noise at Honam line(Seodaejeon- Jangseong) for passenger and power cars. The noise level is below 69㏈A for Seamaeul PMC(Powered Motor Car) coachs, below 65㏈A for Seamaeul and Mukungwha coachs, over 80㏈A for the driver's room of PMC and DEL (Diesel-Electric Locomotive). We also proposed the criteria of interior noise in free field conditions, below 67㏈A for passenger cars, below 86㏈A for power cars.

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