• 제목/요약/키워드: Tunnel Noise

검색결과 428건 처리시간 0.028초

풍동시험을 통한 유연날개 돌풍응답 특성 분석 (Study of Gust Response Characteristics for Flexible Wing by Wind Tunnel Test)

  • 이상욱;김태욱;황인희;임재형;하철근
    • 한국소음진동공학회:학술대회논문집
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    • 한국소음진동공학회 2007년도 추계학술대회논문집
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    • pp.1329-1332
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    • 2007
  • In this study, the design method of flexible wing model for gust response measurement wind tunnel test was presented. The design concept proposed herein was validated by modal testing of the flexible wing model manufactured. In addition, aeroservoelastic modeling method for flexible wing model was presented and validated by comparing the gust response analysis results from the method proposed herein with those of commercial software. The gust response characteristics of the flexible wing model was studied by wind tunnel test for measuring the flexible wing gust response due to the induced gust excitation by gust generator. The aeroservoelastic modeling methods proposed and the wind tunnel test results obtained in this study can be applied for wind tunnel testing of the flexible wing for gust response alleviation.

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한국형 고속전철용 판토그라프의 설계 및 제작 (The Design and Manufacture of Pantograph for Korean High Speed Train)

  • 김휘준;박수홍;정경렬;배정찬
    • 한국소음진동공학회:학술대회논문집
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    • 한국소음진동공학회 2001년도 추계학술대회논문집 II
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    • pp.1223-1228
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    • 2001
  • We have been developing the pantograph for Korean High Speed Train for the last five years. To fulfil the following requirements at designed speed of 350km/h : 1) contact loss less than 1 %, 2) aerodynamic noise less than 91dB, 3) average uplift force less than 200N, the pantograph has been modified two times since the first prototype pantograph was manufactured, By means of the following up characteristic test, low speed wind tunnel test, and high speed wind tunnel test for the prototype pantographs, we found that the aerodynamic uplift force did not exceed l60N at speed up to 350km/h and the aerodynamic noise was less than 88dB, that the following up characteristics of the prototype pantograph was excellent.

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3차원 날개의 캐비테이션 소음 계측시험 (Experimental Study on the Cavitation Noise of a Hydrofoil)

  • 이승재;서종수;한재문
    • 대한조선학회논문집
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    • 제44권2호
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    • pp.111-118
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    • 2007
  • In order to investigate the noise characteristics of the different caviation, noise measurements were carried out in a large cavitation tunnel of the Samsuug Ship Model Basin(SSMB). The noise measurements for a 3-dimensional hydrofoil were carried out at the angle of attack of $12^{\circ}$ and $16^{\circ}$ according to the decrease in cavitation number. It is exhibited that sound pressure level(SPL) increased sharply with cavitation inception. The frequency of the noise induced by sheet cavitation was higher than that of tip vortex cavitation in the phase of cavitation inception. Within the range of the high frequency, in the case of fully developed cavitation, sheet cavitation noise was significantly increased in sound pressure level compared with tip vortex cavitation noise. In this study, the noise characteristics of the different cavitation types were considered experimentally and would be utilized as a basis for the analysis of propeller cavitation noise.

터널 주행을 고려한 고속열차의 실내소음 특성 평가 (Evaluation of Interior Sounds of High-speed Trains Considering the Condition of Tunnel Running)

  • 김재호;김호준;전진용
    • 한국소음진동공학회논문집
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    • 제24권3호
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    • pp.253-260
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    • 2014
  • conducted. In-situ measurements were conducted to investigate the noise characteristics in high-speed trains such as KTX and KTX-Sancheon. Binaural microphones and spherical microphone were adopted to record and evaluate the spectral characteristics and noise incidence characteristics at the seats in the passenger cars. Environmental elements were also recorded during the noise measurements using a camcorder and GPS application. In addition, auditory tests were conducted to investigate annoyance of interior noise of high-speed trains. Based on the objective measure and subjective responses on interior noise, statistical analysis such as correlation and regression analyses were carried out. From the results perception models for evaluating the interior noise of high-speed train were derived.

저소음 대형 캐비테이션 터널 구동 펌프 개발 (Development of the Driving Pump for the Low Noise Large Cavitation Tunnel)

  • 안종우;김건도;김기섭;이진태;설한신
    • 대한조선학회논문집
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    • 제45권4호
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    • pp.370-378
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    • 2008
  • It is reported to develop the driving pump for the Low Noise Large Cavitation Tunnel(LOCAT) which is under construction at Maritime & Ocean Engineering Research Institute(MOERI). For low background noise condition of the LOCAT, it is crucial not only the best pump efficiency but also no cavity occurrence at any operating conditions. Design condition of the pump is determined by considering the required pump headrise, flow quantity, shaft rotation velocity and pump diameter. Performance analysis of the pump is conducted using commercial CFD codes ($BladeGen^+$, CFX-10), and the predicted results are verified by a series of model tests. Cavity was not observed at any operating condition in the model test, which were conducted at the midium cavitation tunnel of MOERI. The optimum pump for LOCAT, named as LP-11, was successfully developed through a series of pump design processes composed of blade design, performance analysis and model test.

생체모방공학을 이용한 고속철도 차간 공간에 적용한 부엉이 깃 형상 크기에 따른 공력소음 저감 연구 (The Effect of Scaling of Owl's Flight Feather on Aerodynamic Noise at Inter-coach Space of High Speed Trains based on Biomimetic Analogy)

  • 한재현;김태민;김정수
    • 한국소음진동공학회:학술대회논문집
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    • 한국소음진동공학회 2012년도 춘계학술대회 논문집
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    • pp.606-611
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    • 2012
  • An analysis and design method for reducing aerodynamic noise in high-speed trains based on biomimetics of noiseless flight of owl is proposed. Wind tunnel testing and numerical CFD (Computational Fluid Dynamics) simulation for the basic inter-coach spacing model are carried out, and their results compared. To determine the effect of scaling of the owl's flight feather on the noise reduction, two-fold and a four-fold scaled up model of the feather are constructed, and the numerical simulations are carried out to obtain the aerodynamic noise levels for each scale. Original model is found to reduce the noise level by 10 dB, while two-fold increase in length dimensions reduces the noise by 12 dB. Validation of numerical solution using wind tunnel experimental measurements are presented as well.

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Reducing the wind pressure at the leading edge of a noise barrier

  • Han, Seong-Wook;Kim, Ho-Kyung;Park, Jun-Yong;Ahn, Sang Sup
    • Wind and Structures
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    • 제31권3호
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    • pp.185-196
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    • 2020
  • A method to reduce the wind pressure at the leading edge of a noise barrier was investigated by gradually lowering the height of a member added to the end of the noise barrier. The shape of the lowered height of the added member was defined by its length and slope, and the optimal variable was determined in wind tunnel testing via the boundary-layer wind profile. The goal of the optimal shape was to reduce the wind pressure at the leading edge of the noise barrier to the level suggested in the Eurocode and to maintain the base-bending moment of the added member at the same level as the noise-barrier section. Using parametric wind tunnel investigation, an added member with a slope of 1:2 that protruded 1.2 times the height of the noise barrier was proposed. This added member is expected to simplify, or at least minimize, the types of column members required to equidistantly support both added members and noise barriers, which should thereby improve the safety and construction convenience of noise-barrier structures.

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

  • 김낙영
    • 한국소음진동공학회:학술대회논문집
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    • 한국소음진동공학회 2014년도 추계학술대회 논문집
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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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