• Proceedings of the Korean Society of Computer Information Conference
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• 2022.01a
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• pp.123-126
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• 2022

본 논문에서는 철도 교량 운행 상황을 가정하는 모형 철도를 사용하여 실제 철도 교량에서 발생할 수 있는 소음, 진동등 위험 요소로 분류될 수 있는 데이터들을 수집하고 수집된 데이터들을 활용하여 실시간으로 위험 요소로부터 발생할 수 있는 위험 상황들을 분류하고 적절한 조치들을 상황에 맞게 취할 수 있도록 한다.

• Journal of the Korean Society for Railway
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• v.16 no.5
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• pp.358-364
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• 2013

In the second part of the paper, a design strategy for an apartment complex constructed at a railway depot is proposed for vibration reduction purposes. Various design parameters such as the vehicle operating speeds, artificial land behavior, housing support structure, and apartment sub-structures are individually examined to reduce the transmission of vibrations through building structures. Building construction on an artificial land should be subjected to regulations that require the application of a vibration reduction scheme based on the mechanics that govern the vibration transmission phenomena. The implementation of these parameters at an early design stage will provide a quiet living environment for residents who may be exposed to excessive noise and vibration.

• Journal of the Korean Society for Railway
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• v.11 no.2
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• pp.176-181
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• 2008

This paper presents results from experimental analysis of a friction-driven wheel responsible for generating wheel squeal noise. Squeal noise generating mechanism has been examined under the laboratory condition by the model rig on a small scale. Creep characteristics and squeal noise were observed by changing the possible variables, such as relative velocities and friction coefficients in time- and frequency-domain.

• Journal of the Korean Society for Railway
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• v.10 no.3 s.40
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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.

• Journal of the Korean Society for Railway
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• v.12 no.4
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• pp.465-471
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• 2009

In this paper, a relationship between the noise and vibration of a high-speed train's wheelset is examined by using time-varying frequency analysis with random data analysis which together contributes to a reduction in the number of experimental running. The noise and vibration of the wheelset is mainly caused by an interaction between the wheel and railway which shows in non-stationary characteristics. For the analysis, they are measured by some microphones and accelerometers, and those signals are post-processed by time-varying frequency analysis with random data analysis. From the analysis, their methods are useful for analyzing the noise and vibration of high-speed train's wheelset.

• Journal of KSNVE
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• v.10 no.4
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• pp.559-564
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• 2000

• Journal of KSNVE
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• v.9 no.3
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• pp.425-430
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• 1999

• Journal of KSNVE
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• v.3 no.2
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• pp.103-111
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• 1993

본 글에서는 건설기술자의 입장에서, 고속철도에서 발생하는 진동현상 및 그 대책에 대해 개략적으로 살펴보았다. 불행히도 현재까지 고속철도 진동에 관한 국내 연구는 거의 전무한 실정이어서, 여기서 제시된 대부분의 자료는 현재 고속 철도가 운행되고 있는 선진외국에서 수행한 연구결과를 인용한 것이다. 그러나 진동 문제는 열차 고속화를 추진함에 있어서 반드시 해결해야 될 주요과제의 한 분임을 감안하여, 공단에서는 열차가 350 km/h까지 주행시 고속철도에서 발생하는 진동을 예측하고, 이에 대한 대책을 강구하기 위한 연구를 적극적으로 추진하고 있으며, 진동문제외에 소음, 승차감, 탈선계수, 공기동력학 등 고속철도 및 일반철도의 고속 화와 관련된 제반연구를 단계적으로 추진하고 있다. 이러한 기회를 통하여 독자들에 게 고속철도에 관한 지대한 관심을 가지고, 다방면에서의 기술협조 및 정보교환을 간곡히 요청하는 바이다.

• Journal of the Korean Society for Railway
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• v.16 no.3
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• pp.175-182
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• 2013

Rolling noise is an important source of noise from railways; it is caused by wheel and rail vibrations induced by acoustic roughness at the wheel/rail contact. To reduce rolling noise, it is necessary to have a reliable prediction model that can be used to investigate the effects of various parameters related to the rolling noise. This paper deals with modeling rolling noise from wheel and rail vibrations. In this study, the track is modeled as a discretely supported beam by regarding concrete slab tracks, and the wheel vibration is simulated by using the finite element method. The vertical and lateral wheel/rail contact forces are modeled using the linearized Hertzian contact theory, and then the vibration responses of the wheel and rail are calculated to predict the radiated noise. To validate the proposed model, a field measurement was carried out for a test vehicle. It was found that the predicted result agrees well with the measured one, showing similar behavior in the frequency range between 200 and 4000 Hz where the rolling noise is prominent.

• Proceedings of the Acoustical Society of Korea Conference
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• autumn
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• pp.247-250
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• 2000

본 논문에서는 최근 공력소음 및 소음제어 분야의 연구 동향을 정리하고, 이에 대한 미래의 가능성을 진단해 본다. 공력소음공학은 학문적 관심과 실용적 응용성을 동시에 만족시키면서, 이러한 목적을 달성하기 위해 수치적 혹은 실험적인 여러 가지 방법들을 다양하게 채용하고 있는 학제적 (interdisciplinary) 연구 분야이다. 자동차 냉각팬 소음, 헬리콥터 소음, HRSG 소음, 고속 철도 소음, 원심 압축기 소음, 수중 추진기 소음, 전산공력음향학, 능동 소음 제어, 충격파-와동 간섭 소음 등 현재 연구되어지고 있는 문제들을 간략하게 조명하면서, 환경 과학과 인간 공학으로서의 이 분야가 지닌 미래의 무한한 잠재력을 고찰한다.