• Title/Summary/Keyword: 터널 소음

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A Study on the Effect of Blasting Vibration on the road (터널발파 진동이 도로상부에 미치는 영향 분석)

  • Kim, Nagyoung
    • Proceedings of the Korean Society for Noise and Vibration Engineering Conference
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    • 2014.10a
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    • pp.821-822
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    • 2014

  • When performing the tunnel excavation blasting, the lower road structure can cause the damage of the structure caused by blasting vibration. In this case the existing structurel meet all of the static and the dynamic stability. But in the domestic management of building structures is presented vibration and is the only criteria, and the criteria for major civil engineering structures insufficient research situation. This study examined the influence of the road structure according to the blast vibration by utilizing the numerical analysis.

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A Development of the Light Weight Noise Tunnel on a High Degree of Efficiency and Environmentally Friendly for Railway (철도용 고효율 친환경 경량방음터널 기술개발)

  • Son, Jeong-Gon;Park, Gwang-Hyeon;Ryu, Rae-Eon
    • Proceedings of the Korean Society for Noise and Vibration Engineering Conference
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    • 2014.04a
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    • pp.487-490
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    • 2014

  • These Days a lot of Noise Complaints in vicinity of Railway has been more increase than before. Almost 1/3 Residences who lives in Railway side are Exposure to Noise Pollution. Since the Apartment Buildings around Railway are getting more higher, so those of the Noise Barrier are not best solution anymore. We are going to make a New Plane with the state of the art technology for Railway Noise Abatement Control. Our Goal are focus on a development of Light Weight Noise Tunnel designed by new absorption mat'l and tunnel Stucture on the Overbridge and Viaduct of existing Railway. New Noise Tunnel will be reducing their weight more than 30% against Road Traffic One and also 10dB(A) Noise Reduction against Noise Barrier.

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Broadband Transmission Noise Reduction Performance of Smart Panels Featuring Piezoelectric Shunt Damping and Passive Characteristics (압전감쇠와 수동적 특성을 갖는 압전지능패널의 광대역 전달 소음저감성능)

  • 이중근;김재환
    • The Journal of the Acoustical Society of Korea
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    • v.21 no.2
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    • pp.150-159
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    • 2002

  • The possibility of a broadband noise reduction of piezoelectric smart panels is experimentally studied. Piezoelectric smart panel is basically a plate structure on which piezoelectric patch with shunt circuits is mounted and sound absorbing material is bonded on the surface of the structure. Sound absorbing materials can absorb the sound transmitted at mid frequency region effectively while the use of piezoelectric shunt damping can reduce the transmission at resonance frequencies of the panel structure. To be able to tune the piezoelectric shunt circuit, the measured electrical impedance model is adopted. Resonant shunt circuit composed of register and inductor in stories is considered and the circuit parameters are determined based on maximizing the dissipated energy through the circuit. The transmitted noise reduction performance of smart panels is investigated using an acoustic tunnel. The tunnel is a square crosses sectional tunnel and a loud speaker is mounted at one side of the tunnel as a sound source. Panels are mounted in the middle of the tunnel and the transmitted sound pressure across the panels is measured. Noise reduction performance of a double smart panel possessing absorbing material and air gap shows a good result at mid frequency region except the first resonance frequency. By enabling the piezoelectric shunt damping, noise reduction is achieved at the resonance frequency as well. Piezoelectric smart panels incorporating passive method and piezoelectric shunt damping are a promising technology for noise reduction in a broadband frequency.

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Transmission Noise Seduction Performance of Smart Panels using Piezoelectric Shunt Damping (압전감쇠를 이용한 압전지능패널의 전달 소음저감 성능)

  • 이중근
    • Journal of the Korea Academia-Industrial cooperation Society
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    • v.3 no.1
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    • pp.49-57
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    • 2002

  • The possibility of a transmission noise reduction of piezoelectric smart panels using piezoelectric shunt damping is experimentally studied. Piezoelectric smart panel is basically a plate structure on which piezoelectric patch with shunt circuits is mounted and sound absorbing materials are bonded on the surface of the structure. Sound absorbing materials can absorb the sound transmitted at mid frequency region effectively while the use of piezoelectric shunt damping can reduce the transmission at resonance frequencies of the panel structure. To be able to reduce the sound transmission at low panel resonances, piezoelectric damping using the measured electrical impedance model is adopted. Resonant shunt circuit for piezoelectric shunt damping is composed of register and inductor in series, and they are determined by maximizing the dissipated energy throughout the circuit. The transmitted noise reduction performance of smart panels is investigated using an acoustic tunnel. The tunnel is a tube with square crosses section and a loud-speaker is mounted at one side of the tube as a sound source. Panels are mounted in the middle of the tunnel and the transmitted sound pressure across panels is measured. Noise reduction performance of a smart panels possessing absorbing material and/or air gap shows a good result at mid frequency region but little effect in the resonance frequency. By enabling the piezoelectric shunt damping, noise reduction of 10dB, 8dB is achieved at the resonance frequencise as well. Piezoelectric smart panels incorporating passive method and piezoelectric shunt damping are a promising technology for noise reduction in a broadband frequency.

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Counter Plan for Reduction of Elevated Railway Bridge Noise (고가교 철도소음 저감을 위한 대책수립)

  • Kim, Byoung-Sam;Lee, Tae-Keun;Han, Sung-Ik;Yeo, Dae-Yeon;Kim, Hyung-Doo
    • Proceedings of the KSR Conference
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    • 2010.06a
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    • pp.6-12
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    • 2010

  • The source of wayside noise for the train are the aerodynamic noise, wheel/rail noise, and power unit noise. The major source of railway noise is the wheel/rail noise caused by the interaction between the wheels and rails. The Structure borne noise is mainly a low frequency problem. The train noise and vibration nearby the elevated railway make one specific issue. The microphone array method is used to search sound radiation characteristics of elevated structure to predict the noise propagation from an elevated railway. In this paper, the train noise and structure borne noise by train are measured. From the results, we investigated the effect on the sound absorption tunnel for elevated railway.

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