• Proceedings of the Korean Society for Noise and Vibration Engineering Conference
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• 1998.04a
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• pp.64-68
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• 1998

본 연구의 목적은 수도권 지하철차량의 소음과 진동에 방음차륜(또는 탄성차륜)이 어느 정도의 효과를 가져오는가를 평가하기 위한 것이다. 실차시험을 통하여 일체차륜이 장착된 차량과 방음차륜이 장착된 차량의 차내소음 및 차체진동을 비교하여 보았다. 그 결과 방음차륜은 지하철차량의 소음과 진동에 효과가 있음을 알 수 있었다. 그러나 실제 적용은 소음과 진동 이외에도 여러 가지 측면에서의 검토가 이루어져야만 가능할 것이다.

• Journal of the Korean Society for Railway
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• v.10 no.6
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• pp.678-684
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• 2007

This research has defined the factors of noise in cars during subway train services, which is surfacing as a new environmental trouble. It shows additional accomplishment of a discerning analysis on the standard of noise regulation as well as its seriousness. According to the Enforcement Regulations for Noise and Vibration under the Ministry of Environment and its standard noise regulation figure 70dB, we divided two groups of which train noise figures are over and under 70dB respectively, and used their 359 results about noise, geometric structures and operation elements, for this analysis. The results and suggestions are following. First of all, when we discern the seriousness of noise in a train, the track type has mattered in geometric structure and the velocity in operation elements. Therefore, when we construct subway from now on, we should take the track type in consideration and establish plans to keep proper speed in respect of operation. Secondly, the established discernment model in this research can be used in making alternative plans or improvement of subway trains hereafter, showing relatively high accuracy of estimation. Consequently, the readjustment of geometric structure and operation elements is needed, not to make it over the regulation standard of noise in case the noise in train is serious. The discriminant model of this research can be used as elementary material for comfortable and safe subway trains, making the estimation of noise seriousness possible.

• Journal of the korean Society of Automotive Engineers
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• v.7 no.4
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• pp.41-48
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• 1985

자동차 태수의 급격한 증가 및 일상생활에 있어서의 자동차 사용할 때간 증대는 곧 개개인의 생 활공간에 대한 자동차의 점유비율이 높아가고 있음을 입증한다. 따라서 거주성, 안락감, 쾌적성 등 종합적 주거환경에 관한 고객의 요구 역시 높은 수준으로 만족되어야 한다. 그러나 연비, 생 산성향상 등 경제적 측면의 요구에 부합하기 위한 자량의 경량화, 소형화 추세는 위에서 언급된 차내 주거환경을 저해하는 여러 가지 난제를 안겨주고 있다. 특히 안락감, 쾌적성의 저해는 가 장 직접적으로 나타나는 문제이며, 이는 차체의 진동입력에 대한 감수성 증대와 진동전달계류의 단서화에 따른 절연능력의 저하에 기인하는 것으로 보인다. 더구나 이와같은 진동문제는 대부분 차내소음을 유발시키며 넓은 주파수범위(홍80-120Hz)에 걸쳐 이들 두가지가 서로 달성되는 경우 가 많기 때문에 대적성의 저해요인으로 가장 크게 주목되고 있다. 자동차 진동 소음의 저감을 위한 노력은 실험적, 이론적 해석방법의 진보에 힘입어 꾸준한 소모로 실현되고 있으며 발생기구, 전달계류, 응답계류을 통틀어 부분적 또는 종체적인 연구가 계속되고 있다. 이와같은 세가지 계류중 전달계류은 발생기구와 응답계류 각각의 특성에 대하여 상호보완적인 역할을 수행해야 하기 때문에 항시 까다로운 요구조건을 안락시키도록 연구되어야 한다. 본고에서는 진동 소음의 전달계류중 가장 중요한 위치를 차지하고 있는 방진고무의 기본적역할 및 이들의 동력학적 측 면에서의 응용원리에 대해 검토하고 최근 급변하는 신기술동향에 대해 소개하고자 한다.

• Proceedings of the Korean Society of Precision Engineering Conference
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• 2005.06a
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• pp.341-344
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• 2005

High-speed trains with maximum speed of 300km/h, named KTX, have started revenue services since April 2004. Because of the geographical features of Korea a large portion of the 'Kyung-Bu' line is comprised of tunnels, which may cause excessive noise in a vehicle. The KTX interior noise follows in tunnel structure and the place where the quality appears different, the quality against hereupon from the commerce vehicle from the research which it sees it executes and comparison to analyze.

• Journal of the Korean Society for Railway
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• v.4 no.2
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• pp.71-77
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• 2001

Standardization EMU in comparison with the existing EMU has been largely changed the material and section profile of the structure as the Aluminium made. This study is analytically predicted the influence of inner noise in tunnel running when the above change is made.

• Proceedings of the Korean Society of Precision Engineering Conference
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• 2007.06a
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• pp.591-592
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• 2007

• Proceedings of the KSR Conference
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• 2000.11a
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• pp.133-141
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• 2000

Standardization EMU in comparison with the existing EMU has been largely changed the material and section profile of the structure as the Aluminium made. This study is analytically predicted the influence of inner noise in tunnel running when the above change is made.

• Journal of KSNVE
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• v.10 no.4
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• pp.629-635
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• 2000

Wheel /rail interaction has been known as a major source of railway noise. In this paper, a low noise wheel structure is developed and its effect on noise reduction is investigated. The developed low noise wheel employees a rubber material inserted into a steel rim or mounted on the wheel surface. Since the low noise wheel has low stiffness and high damping ratio compared to a solid wheel, the measurement results show that it reduces the rolling and squeal noise. It turns out that the proposed wheel could reduce interior noise level by 4∼5dB(A) and vehicle vibration level by 7∼10 dB. Although the proposed structure seems to be promising in noise reduction of railway vehicles, the low noise wheel is to be verified in endurance and cost effect.

• Journal of the Korean Society for Railway
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• v.10 no.5
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• pp.480-486
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• 2007

The subway is a necessary public transportation in big cities, which many citizens are using now. However, the demands for subway inner circumstance by citizens are growing recently. Among them, the noise problem is the hot issue to be solved. So, in this study we classified the characteristics of subway noise using the classification and regression trees (CART) based on noise level data in line No. 5 in Seoul. After that We developed the models for effect of subway noise and analyzed the characteristics through it. The result of this study is that we need to consider the type of geometry design and operational factors when the problem of subway noise improves, because the factors which weigh with subway noise are different by type of geometry and operational part.

• Proceedings of the KSR Conference
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• 2007.11a
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• pp.899-902
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• 2007

The KTX train which brings April 2004 high-speed railroad commerce operation time is operated currently Kyungbu line Seoul-Gwangmyeong-Daejeon-Dongdaegu-Pusan and Honam line Youngsan-Gwangmyeong-Seodaejeon-Kwangju/Mokpo. The high-speed railroad opening to traffic after KTX train interior noise follows in railway line quality change and it is changing together. From the research which it sees until opening to traffic after present time of the KTX vehicle it executed an interior noise quality change from Kyungbu line.