• Title/Summary/Keyword: 터널 소음

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Characteristics Method Analysis of Wind Pressure of Train Running in Tunnel (터널을 주행하는 열차의 풍압에 대한 특성해법 해석)

  • Nam, Seong-Won;Kwon, Hyeok-Bin;Yun, Su-Hwan
    • Journal of the Korean Society for Railway
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    • v.15 no.5
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    • pp.436-441
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    • 2012
  • Pressure waves are generated and propagate in tunnel when train enters a tunnel with high speed. Compression wave due to the entry of train head propagates along the tunnel and is reflected at tunnel exit as expansion wave. While expansion wave due to the entry of train tail propagates along the tunnel and is reflected at tunnel exit as compression wave. These pressure waves are repeatedly propagated and reflected at tunnel entrance and exit. Severe pressure change per second causes ear-discomfort for passengers in cabin and micro pressure wave around tunnel exit. It is necessary to analyze the transient pressure phenomena in tunnel qualitatively and quantitatively, because pressure change rate is considered as one of major design parameters for an optimal tunnel cross sectional area and the repeated fatigue force on car body. In this study, we developed the characteristics method analysis based on fixed mesh system and compared with the results of real train test. The results of simulation agreed with that of experiment.

A study on the improvement of the protective shield construction method and explosion-proof tube performance for tunnel blasting (터널 발파에 대한 방호쉴드 공법 및 방폭튜브 성능 개선 연구)

  • Sang-Hwan Kim;Soo-Jin Lee;Jung-Nam Kwon;Dong-gyun Yoo;Yong-Woo Kim;Kwang-Eun Cho
    • Journal of Korean Tunnelling and Underground Space Association
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    • v.25 no.4
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    • pp.285-303
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    • 2023
  • Interest in building underground spaces is increasing for the creation of downtown infrastructure and efficient space utilization. A representative method of utilizing underground space is a tunnel, and in addition to road tunnels, the construction of utility tunnels such as power conduits and utility conduits is gradually increasing. The current basic tunnel construction method can be divided into NATM (New Austrian Tunnelling Method) and TBM (Tunnel Boring Machine). The NATM is a reliable method, but it is accompanied by vibration and noise due to blasting. In the case of the TBM excavation method, there are disadvantages in terms of construction period and construction cost, but it is possible to improve economic feasibility by introducing appropriate complementary methods. In this study, a blasting method was develop using the NATM after TBM pre-excavation using the protective shield method. This is a method that compensates for the disadvantages of each tunnel construction method, and is expected to reduce construction costs, blasting vibration, and noise. In order to review the performance of the developed method, an experiment was conducted to evaluate the performance of explosion-proof tube to which a protective shield scale model was applied, and the impact of blasting vibration of the protective shield method was analyzed.

건설안전리포트: GS건설 강남순환도시고속도로 6-1공구 -'안전'으로 '재해'라는 암반을 부순다

  • Choe, Jong-Deok
    • The Safety technology
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    • no.158
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    • pp.12-14
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    • 2011
  • 서울 관악구 신림동에 위치한 강남순환도시고속도로 6-1공구, 이곳은 연장 155m의 터널을 뚫는 현장으로, 시공 초기인 현재는 발파작업이 한창 진행되고 있다. 발파작업은 다량의 폭약이 수시로 사용되는 만큼 위험성이 상당히 높은 공정 중 하나다. 하지만 이곳 현장의 모습을 보면 정말 위험공정이 맞나하는 의구심이 들게 된다. 그만큼 안전관리가 철저하다는 얘기다. 수차례에 걸친 시험발파를 통해 진동과 소음을 최소화한 발파작업이 이뤄지고 있으며, 작업 시 대응절차에 나서는 근로자들의 모습도 일사불란하기 그지없다. '안전'으로 터널공사의 새로운 교과서를 만들겠다는 이곳 현장을 찾아가 그들만의 특별한 안전활동을 살펴봤다.

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Characteristics of Cavitation Noise on High-Speed Propellers (고속 프로펠러의 캐비테이션 소음 특성)

  • I.H. Song;J.W. Ahn;K.S. Kim;I.S. Moon
    • Journal of the Society of Naval Architects of Korea
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    • v.37 no.2
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    • pp.22-29
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    • 2000
  • The cavitation noised of high-speed propellers was experimentally studied in KRISO cavitation tunnel. In this paper, a series of cavitation noise tests were carried out for five propellers with various sections and loading distributions. From the experimental results, the noise characteristics of various cavitation pattern and the noise performance of the propellers were analyzed. There can be used for optimum design for high-speed propellers.

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

  • Kim, Jae-Chul;Lee, Chan-Woo
    • Proceedings of the Korean Society for Noise and Vibration Engineering Conference
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    • 2005.11b
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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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Consideration of Noise Source Characteristics for Subway by Noise Measurement (운행 및 정지시 소음측정에 의한 전동차 소음원 특성 고찰)

  • Cho Jun-Ho;Jung Woo-Sung;Jung Jeong-Duck;Kim Myeong-Ryong;Kwon Sung-Tae
    • Proceedings of the KSR Conference
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    • 2003.05a
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    • pp.622-626
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    • 2003
  • 도시 중심가를 오가는 전동차의 경우 도시 사이를 운행하는 일반 기존선과는 다른 소음 특성을 가진다. 가장 두드러진 특징으로는 일반 기존선은 주로 디젤기관(디젤전기기관차 포함)에서 얻어지는 추진력을 이용하여 운행되나 도시철도에 사용되는 전동차의 경우는 그 추진력을 공급된 전기에너지에 의해 그 추진력을 얻는 것이다. 따라서 주요한 소음원의 특성도 상이하며, 또한 개활지를 중심으로 운행되는 기존선 열차에 반해 도시 전동차는 주로 터널내부에서 운행되고 있다. 따라서 본 연구에서는 도시 전동차의 소음원의 특성에 대해 측정 사례를 중심으로 나타내었다.

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The Design of Realtime Management System to support the Railway Multi-View Detection based on Vibration and Noise Sensor Data (진동 및 소음 센서 데이터 기반의 다중 철도 주변감지 실시간 관리 및 운용시스템 설계)

  • Oh, Ryumduck
    • Proceedings of the Korean Society of Computer Information Conference
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    • 2020.07a
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    • pp.583-584
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    • 2020
  • 철도의 고속화 및 수송력 증대로 인하여 철도 터널 및 주변 환경에서 발생하는 소음 및 진동 공해는 커다란 사회문제로 대두되고 있으며, 도시의 고층화로 인해 차단벽을 이용한 방음 기술의 한계와 철도 차량의 고속, 경량화 추세로 인한 소음. 진동, 위험상황으로 인한 문제는 지속적으로 발생하고 있다. 본 논문에서는 IoT 기술을 결합한 안정성을 보장하는 IT 기반기술의 위험상황 감지, 철도 소음진동 분석, 모니터링 및 제어할 수 있는 시스템을 설계하고, 철도 인근지역 주민 또는 유관기관에 소음진동 수치에 따른 적합한 대응 시스템을 제공할 수 있는 IoT 기술 제어 분석 및 안정화 서비스 시스템을 설계하였다.

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A Study on the installation time and method of soundproofing facilities according to a Tunnel blasting work. (터널발파작업에 따른 방음시설의 설치시기와 방법에 대한 고찰.)

  • Won, Yeon-Ho;Son, Young-Bok;Jeong, Jai-Hyung
    • Proceedings of the KSEE Conference
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    • 2006.10a
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    • pp.119-140
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    • 2006
  • The rock excavation work by doing blasting breaks the rock by using a shock pressure and gas pressure produced when explosive explodes and the shock wave by shock pressure propagated three-dimensionally from the exploding center is on the decrease notably to the distance, however, $0.5{\sim}20%$ of energy produced by blasting propagates into the ground outside a crack zone by the shape of an elastic wave, on the ground it appears as a ground vibration with a seismic amplitude and a seismic cycle, it is called a blasting vibration. on the other side, what propagated in the air is called a blasting sound. The blasting sound of both means the things which the shock sound within the range the audible frequency($20{\sim}20000Hz$) of the elastic wave in the air influences the response system of a human body, it doesn't harm physically to any structures but influences unreasonably a work accomplishment, such as a work discontinuance due to the outbreak of a public complaint by a mental pain, reduction of a blasting scale, etc.. So, this study is examined at about 20 sites on the installation time and method of soundproofing facilities for reduction of the sound accompanied with a tunnel blasting work.

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Analysis on the Noise Levels of the Passing Train in the High Speed Train Terminals (고속철도역사 통과구간의 소음도 분석)

  • 한찬훈
    • Proceedings of the Acoustical Society of Korea Conference
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    • 1998.06c
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    • pp.427-430
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    • 1998
  • 본 논문은 고속철도 역사의 통과구간 설계에 있어서 소음방지에 효과적인 설계안을 검토하기 위하여 7가지의 다양한 대안의 모델을 시뮬레이션하여 그 결과를 비교 분석하였다. 고속열차의 최대 운영속도 300 km/h 기준시 승강장의 허용소음도는 약 91 dB(A) 일 때 이를 만족하는 설계안은 통과구간의 양쪽에 설치하는 방음벽으로는 부족하며 통과구간을 곡면유리로 폐쇄한 터널식의 설계가 허용소음도를 만족하는 것으로 나타났다.

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