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공력진동실험을 이용한 고층건물의 변장비 변화에 따른 횡방향 진동응답
유기표(You Ki-Pyo),김한영(Kim Han-Young),조지은(Cho Ji-Eun),김영문(Kim Young-Moon) 대한건축학회 2003 大韓建築學會論文集 : 構造系 Vol.19 No.10
Modern flexible tall buildings with reduced damping ratios are sensitive to wind-induced vibrations. Most of the excessive wind-induced vibrations of tall building are due to vortex-induced vibrations. The type of building section model having sectional area of 0.0025㎡ and the height of 0.5m with side ratio denoted as D/B, of 1.0, 2.0, 3.0, 4.0 was selected for aeroelastic experimental study. All measurements were made in a boundary layer wind tunnel at the Chonbuk National University Wind-tunnel Lab. In this paper, the vortex induced vibration of tall buildings with aspect ratio 10 was investigated in turbulent layer flows over suburban areas. Effectiveness of increasing damping ratios was investigated.
유기표(You Ki-Pyo),황진택(Hwag Jin-Taik),이후룡(Lee Hoo-Ryong),윤현재(Yoon Hyun-Jae),김영문(Kim Young-Moon) 대한건축학회 2009 大韓建築學會論文集 : 構造系 Vol.25 No.4
Wind pressure experiments are conducted using a pressure transducer in order to examine the change of wind pressure in tall buildings, but the equipment is expensive and difficult to fix directly on the model. Thus, wind pressure experiments are often performed using pipes and tube taps. In many cases, however, because of the reduced scale in wind tunnel experiments and other reasons, the pipe for measuring wind pressure at a specific position of a tall building cannot be maintained constant. Thus, the present study obtained a pressure transfer function according to the length and thickness of tube tap and the shape of tube in the model, and conducted a calibration experiment using a restrictor . The results of the experiment are as follows. 1) The effect of the length of the tube tab installed in the model was insignificant that it was negligible in the tube pressure measuring system using a tube. 2) In case the tube tab was bent when a model was built, the length of the bent part did not have a significant effect on pressure. 3) When the tube installed inside the model was twisted, it did not have a significant effect on the result of wind pressure measurement.
유기표(You Ki-Pyo),유장열(You Jang-Youl),김영문(Kim Young-Moon) 대한건축학회 2009 大韓建築學會論文集 : 構造系 Vol.25 No.2
Fruit growers install wind fences to prevent fruits from dropping. To examine the effect of wind fences in reducing wind velocity, this study conducted a performance experiment, a farmhouse model wind tunnel experiment, and field measurements, and analyzed how wind fences reduce wind velocity. Among the three types of wind fence with porosities ranging between 30%, 40% and 55%. For the wind fence experiment, we selected two fruit farms growing pears. We modeled the fruit farms and the surrounding topography at a scale of 1/1000. Field measurements to examine the effect of wind fences on wind velocity reduction were made at a real farm, which was Farm 1 in the model experiment. The windbreak performance of the wind fence was highest when its porosity was 40%. According to the result of a field measurements at Farm 1, wind velocity decreased by 92% at 6m behind the shelter fence. This result is almost coincident with the result of an experiment on the performance of a wind tunnel experiment.
유기표(You Ki-Pyo),김영문(Kim Young-Moon) 한국태양에너지학회 2012 한국태양에너지학회 논문집 Vol.32 No.2
This study purposed to predict wind energy for small size wind power generators at 50m above the ground in each area using mean wind speed data for 10 minutes collected from 2001 to 2011 by meteorological data in large cities having over 60% of 15 story (50m) or higher apartments including Seoul, Daejeon, Gwangju and Daegu representing the inland region, and Busan, Incheon and Ulsan representing the coastal region. In the results of analysis, we confirmed close agreement between observatory weather data and probability density distribution obtained using Weibull's parameters, and this suggests that Weibull's parameter is applicable to the estimation of wind energy. Hourly output energy using the mean wind speed for 10 minutes and output energy obtained from Weibull's parameter showed an error less than 5%, and thus it was found that wind energy can be evaluated using Weibull's modulus.
유기표,김영문,유장열,You, Ki-Pyo,Kim, Young-Moon,You, Jang-Youl 한국공간구조학회 2013 한국공간구조학회지 Vol.13 No.2
This paper attempted to bridge this gap by identifying the number of flat-plate solar collectors. The characteristics of wind pressure coefficients acting on flat-plate solar collectors which are most widely used were investigated for various wind direction. Findings from this study found that the location where the maximum wind pressure coefficient occurred in the solar collector was the edge of the collector. Regarding the characteristics according to the number of collectors, the paper found that downward wind pressure coefficient of the lower edge of the collector was higher than the upward wind pressure coefficient of the upper edge of the collector in the basic module (1 piece). However, as the number of collectors increases, the upward wind pressure coefficient of the upper edge become higher than the downward wind pressure coefficient of the lower edge. Finally yet important, it was found that the location of the maximum wind pressure coefficient was changed according to the number of solar collectors.
동조액주관댐퍼의 고유진동수와 오러피스에 대한 감쇠 특성
유기표(You Ki-Pyo) 대한건축학회 2010 大韓建築學會論文集 : 構造系 Vol.26 No.4
Orifices are installed on the horizontal tube of a tuned liquid column damper in order to increase the coefficient of head loss of the damper. Because such orifices control the flow of the horizontal tube, there is a variation in the level of water in the vertical tube. In general, only one orifice is installed in the middle for controlling the flow of the horizontal tube. In this study, examined the damping characteristic of a tuned liquid column damper according to porosity, the number of orifices installed and natural frequency. Amplitude response was lower when orifices were not installed than when they were, and the lower amplitude response increased the head loss coefficient. Compared to when only one installed, when two orifices were installed amplitude response decreased by up to 7%.
유기표,김영문,유장열,백선영,You, Ki-Pyo,Kim, Young-Moon,You, Jang-Youl,Paek, Sun-Young 한국공간구조학회 2014 한국공간구조학회지 Vol.14 No.2
Meteorological observatories use measuring boards on even ground in open areas to measure the amount of snowfall. However, it is very difficult to evaluate the accurate amount of snowfall because of the effects of the wind. Therefore, this study tried to determine the internal wind flow inside a windbreak fence to identify an area that was not affected by wind in order to measure the snowfall. We performed a computational fluid dynamics analysis, wind tunnel test of the type and height of the windbreak fence, and analyzed the wind flow inside the fence. The results showed that a double windbreak fence was better than a single windbreak fence for reducing the wind velocity. The reduction of the wind velocity was highest in the middle of a windbreak fence with a width of 4 m and a height of 60cm, where the windbreak fences were fixed to the ground.
유기표(You Ki-Pyo),김영문(Kim Young-Moon) 대한건축학회 2004 大韓建築學會論文集 : 構造系 Vol.20 No.10
Many investigations for reducing wind-induced vibrations of tall building have been conducted. One of them is adding an auxilIary damping device to the building so increase damping ratio of building and reducing responses of the building. In this paper, a passive TLD attached on the top of the aeroelastic building model of which has different side ratio of 2 and 3 and of which aspect raio is 8, was used for wind tunnel test. The boundary layer flow representing suburban area was simulated with normal direction is normal to the small face of the building model. The rms across-wind displacements at the top of the building model which was caused mainly by vortex-induced excitation were measured. It was found out that the effect of vortex-induced excitations of tall building is reduced effect of vortex-induced excitations of tall building 15 TLDs which have mass ratio of 1%-2% and frequency ratio of 0 95-1 05 were used for test. From the test results, maximum TLD effects for reducing vortex-induced excitations appears at the mass ratio of 15% and frequency ratio of 1%.
TMD을 이용한 풍하중을 받는 고층건물의 공력진동응답실험
유기표(You Ki-Pyo) 대한건축학회 2004 大韓建築學會論文集 : 構造系 Vol.20 No.12
The aeroelastic experiment of along and acrosswind vibration was carried out on squire model in a suburban boundary layer. The model tuned mass damper consisted of a small aluminium block cantilevered downward on a piano wire. The TMD mass ratios are respectively 1.0%, 2.0%. The dampers were approximately tuned to the natural frequency of the building model. The type of building section model having sectional area of 0.004㎡ and the height of 0.4m with side ratio denoted as D/B, of 2.0, was selected for aeroelastic experimental study. The lop maximum displacement RMS value appears at TMD2 and generalized mass ratio of 2%.