• Title, Summary, Keyword: Noise and Vibration

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Design of railway noise and vibration Database considering noise source of railway noise complaints focused area (철도 소음 민원 집중 지역의 소음 발생원을 고려한 철도 소음진동 데이터베이스 설계)

  • Lee, Hong-gi;Lee, Hyun-jun;Son, Sung-wan
    • Proceedings of the Korean Society for Noise and Vibration Engineering Conference
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    • pp.812-816
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    • 2014
  • Recently, there is an increasing interest on railway noise and vibration. Accordingly, the importance of technology that can assess the vibration and structural noise caused due to the railway operation is increasing. Additionally, the need to construct a railway noise and vibration database which is a basic data for a reliable railway noise and vibration assessment as well is increasing. However, the problem is that the currently constructed database fails to include the factors influencing the occurrence of noise and vibration sufficiently. Therefore, In this paper, design a railway noise and vibration database that includes those factors sufficiently and which enables the continuous data management and accumulation.

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A Study on the noise & vibration properities of Fan Filter Unit and evaluation of effect to Clean Room (Fan Filter Unit 소음ㆍ진동 특성과 청정실에 미치는 영향성 평가에 관한 연구)

  • 백재호;손성완
    • Proceedings of the Korean Society for Noise and Vibration Engineering Conference
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    • pp.778-784
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    • 2002
  • FFU are used increasingly by the microeleceronics industry to provide clean recirculating air for the fabrication of integrated circuits and laminar flow air. There may be several hundred ffu in a large cleanroom, covering 100% of the ceiling area. Hence, there is of often knowledge in the inside and outside of the country the flu give rise to noise & vibration trouble to microelectronics industry. Noise & Vibration control for satisfication about noise & vibration criteria in TFT-LCD factory cleanroom be in need of exact noise & vibration data of accurence from utility & equipment that can be exert a bad influence upon cleanroom. In this pater, hence we found out noise and vibration properities of ffu by using experimental method. And, we performed noise & vibration analysis about noise it vibration level in cleanroom using semiempirical method for quantative approach about noise & vibration level in cleanroom.

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A Study on the Improvement Strategy of Environmental Noise and Vibration Administration System (환경소음·진동 관리체계 개선전략에 관한 연구)

  • Park, Young-Min;Lee, Nae-Hyun;Sunwoo, Young
    • Journal of Environmental Impact Assessment
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    • v.10 no.4
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    • pp.305-317
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    • 2001
  • Effects on increased noise influenced residents on the urban areas as well as the rural areas because of rapidly increasing traffic volume and newly-constructed road. The object of this study is to better establish environmental policy for the year 2000s through analyzing current environment administration system in the field of noise and vibration. Noise and vibration administration system in Korea is composed of various standards in areas of noise environment, traffic noise regulation, living noise regulation, factory noise and vibration regulation, and aircraft noise regulation. Furthermore, there exists environment noise and vibration monitoring networking system. This study is to improve noise and vibration administration system through analyzing present condition and problems. This study suggests improved noise and vibration administration system by achieving four steps ; 1) goal establishment in noise and vibration administration system; 2) development of reduction mitigation method; 3) estimation of reduction mitigation method; 4) establishment of enforcement method. Proposed "Noise and Vibration Policy Committee" should be established to harmonize noise and vibration policy on scientific basis for the $21^{st}$ century.

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A Study on the Radiated Noise the Prediction in the Pipe by Fluid Induced Vibration using the Radiation Efficiency and Pipe Surface Vibration (배관 표면진동과 방사효율을 이용한 배관 소음예측기법 연구)

  • Yi, Jongju;Park, Kyunghoon;Jung, Woojin;Seo, Youngsoo
    • Transactions of the Korean Society for Noise and Vibration Engineering
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    • v.24 no.10
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    • pp.763-769
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    • 2014
  • This study is on the experiment and prediction of the pipe noise due to the internal fluid. The vibration of pipe external surface and noise in air were measured according to the internal fluid velocity and pipe type. In the experiment, the vibration and noise level of the straight pipe and rounded pipes show that the vibration and noise level are almost same. The 900 mitred pipe shows the high vibration and noise level. In the prediction of noise due to the internal flow, the method using the pipe surface vibration and radiation efficiency shows good agreement with experimental result.

Investigation Study on Noise and Vibration Condition in Construction Site (건설공사장 소음.진동 실태조사에 관한 연구)

  • Sun, Hyo-Sung;Park, Young-Min;Jo, Youn-Hee
    • Proceedings of the Korean Society for Noise and Vibration Engineering Conference
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    • pp.879-881
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    • 2008
  • The construction noise and vibration is a serious social problem in the downtown. This results in many expenses and delays of construction process because of the satisfactory settlement of popular complaints. In this study, we analyze the dispute mediation cases on the damages of construction noise and vibration and the noise and vibration condition in construction sites by using questionnaire surveys.

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A study on the Prediction of the Radiated Noise by Fluid Induced Vibration in the pipe (배관의 표면진동을 이용한 소음예측기법 연구)

  • Yi, Jongju;Pak, Kyunghyon;Jung, Woojin;Seo, Youngsoo
    • Proceedings of the Korean Society for Noise and Vibration Engineering Conference
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    • pp.609-614
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    • 2014
  • This study is on the experiment of the pipe noise due to the internal fluid. The straight pipe, the $90^{\circ}$ mitred pipe, rounded $90^{\circ}$ and $1350^{\circ}$ pipe were tested and measured the vibration and noise. In the experiment, the vibration and noise level of the straight pipe and rounded pipes show that the vibration and noise level are almost same. The $90^{\circ}$ mitred pipe shows the high vibration and noise level. In the prediction of noise due to the internal flow, the use of pipe surface vibration and radiation efficiency shows good agreement with experiment result.

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Characteristics of Transmission of Floor Vibration and Floor Impact Noise Due to Human Activities (거주자의 거동으로 발생하는 바닥진동의 층간 전달 및 바닥충격음의 음압레벨 특성 평가)

  • Lee, MinJung;Choi, HyunKi
    • Transactions of the Korean Society for Noise and Vibration Engineering
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    • v.27 no.1
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    • pp.5-13
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    • 2017
  • Noise complaints among neighbors in apartment building are mainly caused by floor impact noise that is structure born noise due to occupant induced floor vibration. To control this noise problems many researchers have investigated floor systems and finishing materials. Light-weight impact noise affects by finishing materials, but heavy-weight impact noise induced by heel impacts during normal walking or jumping of children is concerned with structural system and floor vibration. To figure out the characteristics of floor impact noise and transmission of floor vibration due to human activities, vibration tests were conducted in apartment buildings. Impact hammer, heel drop and walking activities were loaded at center of upstairs living room, and accelerations of slabs for both upstairs and downstairs and sound pressure levels for downstairs were measured. The acceleration ratio of transmitted floor vibration to downstairs and human induced vibration in upstairs was between 0.5 and 1.0 according to slab size, wall, and load type. And floor impact noise occurred in the range of natural frequency of slab.

A Study on Noise Reduction for the Driving System of a Forklift (지게차 구동부의 소음 진동 저감에 대한 연구)

  • Kim, Woo-Hyung;Hong, Il-Hwa;Chung, Jin-Tai
    • Transactions of the Korean Society for Noise and Vibration Engineering
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    • v.18 no.1
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    • pp.80-86
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    • 2008
  • In this study. the noise sources were identified and the noise and vibration were reduced for an industrial forklift. To identify the noise sourses, noise signals were measured by a microphone on a driver seat and these signals were analyzed with a waterfall plot. For this purpose, the gear mesh frequencies from the gear box of a reducer were not only investigated but noise/vibration sourses of an electric motor were also examined. Furthermore, the frequency response functions were obtained to confirm the vibration and noise sourses. It was found that severe vibration and noise were generated in the casing and the connecting part of the reducer. The severe vibration and noise could be reduced by a structure modification.