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A Study on the Awareness of Noise Pollution by Seoul Citizens - Focusing on Road Traffic Noise - (서울시민의 소음공해 인식에 대한 연구 - 도로 교통소음을 중심으로-)

  • 이효수;정인희;김동수;김흥식
    • Proceedings of the Korean Society for Noise and Vibration Engineering Conference
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    • pp.394-401
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    • 1996
  • Noise pollution, especially road traffic noise has become a major problem in Seoul. However, although noise can be sensed directly, it is considered somewhat less important compared to other environmental pollutions. In this study, we chose nine districts in Seoul and distributed a questionnaire composed of 23 questions in related to the awareness of noise pollution for 950 people living in Seoul. The results were analyzed according to district area, age, occupation, and were compared to the actual noise level measured by the Seoul Metropolitan Government. The analysis of the questionnaire show that road traffic noise is considered to be the main source of noise pollution in Seoul. People think that the individual and the Seoul Metropolitan Government are most responsible for the noise reduction in Seoul, but replies only little effort is put into when asked whether one has made any personal effort to reduce noise. We have concluded that noise pollution is not considered a hazardous problem to most Seoul citizens, and that most of them seem to be used to it. Yet, specific noise reduction policies, especially road traffic noise, are expected to take effect as quality of life is pursued due to economic enhancement.

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A Study on the Awareness of Noise Pollution by Seoul Citizens - Focusing on Road Traffic Noise - (서울시민의 소음공해 인식에 대한 연구-도로교통소음을 중심으로-)

  • 이효수;정인희;김동수;김흥식
    • Journal of KSNVE
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    • v.7 no.3
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    • pp.521-529
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    • 1997
  • Noise pollution, especially road traffic noise-in terms of population exposure-has become a major problem in Seoul. However, although noise can be sensed directly, it is considered somewhat less important compared to other environmental pollutions. In this study, we chose nine districts in Seoul and distributed a questionnaire containing 23 questions in related to the awareness of noise pollution for 950 people living in Seoul. The results were analyzed according to the citizens' awareness on the whole, age, occupation, and were compared to the actual noise level measured by the Seoul Metropolitan Government. The analysis of the questionnarie show that road traffic noise is considered to be the main source of noise pollution in Seoul. People think that the individual and the Seoul Metropolitan Government are most responsible for the noise reduction in Seoul, but replies only little effort is put into when asked whether one has made any personal effort to reduce noise. We have concluded that noise pollution is not considered a hazardous problem to most Seoul citizens, and that most of them seem to be used to it. Yet, specific noise reduction policies, especially road traffic noise, are expected to take effect as quality of life is pursued due to economic enhancement.

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A Study on the Evaluation Unit of a Military Aircraft Noise (군용항공기 소음평가 단위에 관한 연구)

  • Lee, Jun-Ho
    • Transactions of the Korean Society for Noise and Vibration Engineering
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    • v.15 no.5
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    • pp.550-557
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    • 2005
  • Korean 'Law of Aviation' and 'Test Method of Measuring Noise and Vibration' designate to use WECPNL metric based on $L_{max}$ measurement for the accessment of aircraft noise in Korea. However, time duration of noise event can not be considered in $L_{max}$ metric in principle, compensation on the duration has been utilized. A study was done recently to evaluate appropriate duration compensation for the accessment of military aircraft noise under current metric of WECPNL and $L_{max}$. This study was carried out to evaluate what metric is the most appropriate to express aircraft noise including time duration of single noise event, computing and comparing noise exposure with 1 second noise measurement data of military aircraft in $L_{max}$, $L_{Aeq,\;T}$ and SEL. This study shows SEL is the most appropriate noise metric for the evaluation of noise exposure with time duration such as aircraft noise without compensation. It is suggested to use SEL noise metric instead of $L_{max}$ noise metric with duration compensation for the aircraft noise accessment either military aircraft or civilian aircraft.

Installation Effect on Noise Reducer for Railway Traffic Noise (철도환경소음을 줄이기 위한 소음감소기의 설치제안)

  • Kim, Jeung-T.;Hong, Yoon-H.
    • Journal of the Korean Society for Railway
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    • v.10 no.3
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    • pp.278-283
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    • 2007
  • Community noise, especially a rail traffic noise has been serious social issues in Korea. Our society needs practical tools to reduce noise levels for public who live near the railway lines. This paper proposes a noise reducer for railway traffic noise. At the beginning, various types of reducers are discussed, with the advantages and disadvantages with respect to acoustical phenomena. Then, the acoustic effects are discussed based on an insertion loss measurement. After several types of reduces are installed at fields, the noise level is monitored with and without the reducer. The result shows that the proper selection of reducers affects the noise level by 6 dB. The statistics of the mean and a standard deviation turns out to be 3.2 dB and 0.8 dB, respectively. Noise reducers are strongly recommended for the place where apartments are densely constructed alone the railway. Installation of noise reducers seems to be an effective and practical solution for the community traffic noise reduction.

A Study on Suitability of Road Traffic Noise Map for Environmental Noise Impact Assessment (환경소음 영향평가 시 도로교통 소음지도의 적용성 검토 연구)

  • Kim, Ji-Yoon;Park, Sang-Kyu
    • Proceedings of the Korean Society for Noise and Vibration Engineering Conference
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    • pp.311-316
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    • 2008
  • It is needed to assess the impact of the road traffic noise for city planning. In Korea, the current noise impact assessment h3s not yet considered the impacts of the multiple reflection, the deflection and the ground attenuation caused by buildings and other obstacles. A noise map is useful tool to solve this problems. But before everything else, suitability of noise map must be assessed for variety of geometry conditions. In this study, we assessed suitability of road traffic noise map by compared measured noise levels with predicted noise levels from each road traffic noise map for Site A, B and C.

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The Study of Reduction Technologies of Tire Cavity Resonance Noise (타이어 공명 소음(Tire Cavity Resonance Noise) 저감에 관한 연구)

  • Bang, M.J.;Choi, S.I.;Choo, K.C.;Lee, H.J.;Son, C.E.
    • Proceedings of the Korean Society for Noise and Vibration Engineering Conference
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    • pp.596-599
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    • 2008
  • Traditionally, tire made a role of function, which is supporting vehicle load, making brake, transferring traction, etc. But tire is a part of vehicle design, nowadays. In accordance with this market trend, customers need a wide tread design tire (i.e. low series tire). Generally low Series Tire means stiffer than general tire. That brings out increasing road noise. (Especially tire cavity resonance noise) Tire noise is divided in structure home noise and air borne noise. Tire cavity resonance noise (structure home noise) come from vibration between tire and vehicle. In the study, we investigated that tire cavity resonance noise is affected by stiffness of tread and sidewall.

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A Study on a Method to Apply to Domestic Railway Vehicles in Prediction of Railway Noise Using a Noise Map (소음지도를 이용한 철도소음 예측 시 국내 철도차량 적용 방안 연구)

  • Park, Chan-Youn;Park, In-Sun;Oh, Jong-Hwa;Park, Sang-Kyu
    • Proceedings of the Korean Society for Noise and Vibration Engineering Conference
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    • pp.882-888
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    • 2008
  • The increase in logistics and the emergence of high speed vehicles are aggravating the noise problem, and disturbing large numbers of people. Therefore, growing attention is being paid to the creation and utilization of a noise map in order to grasp and predict the influence of noise, and to establish a policy that effectively reduces noise. However, so far there has been little progress in developing a predictive formula for railway noise, and a noise prediction program suitable for the domestic environment. Therefore, there is a need for a method to apply the overseas prediction formula to domestic railway vehicles. This study evaluated the prediction method, the result of which is similar to that of a real measurement, using a noise map. It also employed a commercial software program, SoundPlan, to predict noise.

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Assessment of Can Factory working noise and its reduction (산업현장의 소음.진동 원인분석 및 저감방안 연구)

  • Chun, Hyung-Jun;Ko, Sun-Hee;Chang, Seo-Il
    • Proceedings of the Korean Society for Noise and Vibration Engineering Conference
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    • pp.212-216
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    • 2006
  • The purpose of this study is to obtain an effective enclosing method for noise reduction of press machine operating in a manufacturing company located in Korea. Noise level of the machine is about $90{\sim}105dB$ which is higher than legal standards by industrial safety and health law. This study has predicted the level of noise reduction according to a step by step prevention plan by considering the characteristics of the cause of noise, the permitted limit of noise levels, problems and economical efficiency attendant upon the noise prevention measures. The predicted level of noise at the plant in accordance with the first step is $71.5{\sim}89.5dB(A)$, and can satisfy the permitted limit of noise in a time period of the day. Based on these results, enclosing method adequate for the selected plant's noise characteristics were suggested.

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A Perceptually Motivated Active Noise Control Design and Its Psychoacoustic Analysis

  • Bao, Hua;Panahi, Issa M.S.
    • ETRI Journal
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    • v.35 no.5
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    • pp.859-868
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    • 2013
  • The active noise control (ANC) technique attenuates acoustic noise in a flexible and effective way. Traditional ANC design aims to minimize the residual noise energy, which is indiscriminative in the frequency domain. However, human hearing perception exhibits selective sensitivity for different frequency ranges. In this paper, we aim to improve the noise attenuation performance in perceptual perspective by incorporating noise weighting into ANC design. We also introduce psychoacoustic analysis to evaluate the sound quality of the residual noise by using a predictive pleasantness model, which combines four psychoacoustic parameters: loudness, sharpness, roughness, and tonality. Simulations on synthetic random noise and realistic noise show that our method improves the sound quality and that ITU-R 468 noise weighting even performs better than A-weighting.

A Study on the Construction of 3D Noise Map for Ulsan-City (울산시 소음예측지도 작성에 관한 연구)

  • Lee, Chang-Myung;Song, Chang-Seob
    • Proceedings of the Korean Society for Noise and Vibration Engineering Conference
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    • pp.144-145
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    • 2010
  • 3-D noise map of Mugue Dong of the Ulsan City has been constructed. Comparing with the measured noise level, the predicted noise level has been confirmed for its accuracy. Correction factors for better prediction result using the constructed noise map have been investigated proving that its method is useful. The procedure of noise map construction method has also been introduced using RLS-90, Cadna A.

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