궤도-교량 상호작용 해석기법의 개선안

성인모(In Mo Sung),배현웅(Hyun Ung Bae),정덕희(Duk-hee Jung),임남형(Nam Hyoung Lim) 한국철도학회 2014 한국철도학회 학술발표대회논문집 Vol.2014 No.5

장대레일 궤도가 토공구간이 아닌 철도교량상에 위치하는 경우 궤도와 교량의 상호작용에 의해 장대레일에는 추가적인 변위와 축력이 발생하게 된다. 국내의 궤도-교량 종방향 설계기준에서는 3개의 중요한 하중(교량의 온도변화, 열차에 의한 시/제동하중 및 열차의 수직하중)을 서로 독립적인 하중으로 취급하고 각각의 하중에 대한 응답을 단순히 더하는 해석방법을 사용하고 있다. 또한 하중에 대한 극댓값을 사용하여 하중이력의 영향을 무시하여 궤도와 교량 상부구조물 사이에 발생되는 종방향 하중의 비선형 거동으로 인한 오차를 포함한다. 본 연구에서는 하중이력의 영향이 고려된 수정된 해석방법을 제안하였다. In case of the continuous welded rail(CWR) track is supported by the railway bridge not earthwork section, the additional axial force and displacement are occurred in the CWR due to the trackbridge interaction. Three of important loads((temperature variation in the bridge-deck, braking/acceleration and the vertical load from the passing train) are considered as the independent loading case in the domestic design code, and the answer of each loads are simply added. Errors due to non-linear behavior of longitudinal load occurred between track and bridge-deck are also included ignoring the effects of loading history, and using the maximum value of load. In this study, the modified analysis method was proposed considering the effects of loading history.

단동 플라스틱 온실의 천창 환기효과와 설치기준 분석

남상운(Sang-Woon Nam),김영식(Young-Shik Kim),고기혁(Gi-Hyuk Ko),성인모(In-Mo Sung) 충남대학교 농업과학연구소 2012 농업과학연구 Vol.39 No.2

Dimensions, operation conditions and improvement items for round roof windows were investigated in arch shape single-span plastic greenhouse with roof vents, and natural ventilation performance was analyzed based on the ventilation theory. Diameter of round roof windows was mostly 60 ㎝, and chimney height projected on roof was average 30 ㎝. Installation space was mostly 5 to 6 m but farmhouse of 10 m and over was 16.7% also. A round roof window which has 60 ㎝ diameter was installed to 6 m space generally and 80 ㎝ diameter was installed to 10 m space, but correct standards did not exist. There were a lot of opinions that ventilation effect of round roof windows is fairly good and user satisfaction is generally excellent. It is problem that there is few effects in summer and that vinyl around each vent tears well and rainwater leaks, and improvement hope item required development of automatic control system. In the wind speed of 0.3 ㎧, it was estimated that natural ventilation rates were 0.69, 0.55, 0.50 and 0.48 volumes per minute in case of 2, 4, 6 and 8 m installation space for round roof windows, respectively. It was analyzed that the ratio of ventilation due to buoyancy out of total ventilation were 65.2, 41.9, 29.9 and 22.8% in case of 2, 4, 6 and 8m installation space, respectively. By the round roof windows installed at space of 6 m, ventilation rate was estimated to 0.5 volumes per minute, and we can expect the increase in ventilation rate of 30%. In order to meet the recommended ventilation rate for summer season, we have to install the round roof windows at space of 1 to 2 m. However, it is difficult to apply those installation space because of falling productivity due to lower light transmittance as well as rising costs. It is estimated that the installation space of 6m is appropriate for spring or fall season. Therefore it is necessary to encourage installing the roof windows in single-span plastic greenhouses.

저압 에어포그 시스템을 설치한 온실의 냉방효율

남상운,김영식,성인모,고기혁,Nam, Sang-Woon,Kim, Young-Shik,Sung, In-Mo,Ko, Gi-Hyuk 한국농공학회 2012 한국농공학회논문집 Vol.54 No.5

In order to derive the efficient utilization of low pressure compressed air fogging system, cooling efficiencies with control types were analyzed through cooling experiments in tomato greenhouses. The control types were set up with temperature control, humidity control, temperature and humidity control, and time control. It showed that the cooling effects were 0.7 to $3.3^{\circ}C$ on average and maximum of 4.3 to $7.0^{\circ}C$, the humidification effects were 3.5 to 13.5 % on average and maximum of 14.3 to 24.4 %. Both the cooling and humidification effect were the highest in the time control method. The cooling efficiency of the air fogging system was not high with 8.3 to 27.3 % on average. However, the cooling efficiency of 24.6 to 27.3 % which appears from the time control is similar to the cooling efficiency of high pressure fogging system experimented in Japan. The air fogging system is operated by low pressure, but its efficiency is similar to high pressure. We think because it uses compressed air. From this point of view, we suggest that the air fogging system can get the cooling efficiency of similar levels to that of high pressure fogging system and it will have an advantage from clogging problem of nozzle etc.

교량상 콘크리트 궤도의 솟음량

조영남(Young Nam Cho),성인모(In Mo Sung),배현웅(Hyun Ung Bae),강윤석(Yun Suk Kang),임남형(Nam Hyoung Lim) 한국철도학회 2013 한국철도학회 학술발표대회논문집 Vol.2013 No.11

아치교와 같이 특수한 교량에 설치되는 콘크리트 궤도의 경우 온도변화에 의해 수직 변위가 발생하기 때문에, 일반적으로 지역적 특성을 고려하여 동일한 중위온도에서 시공해야 합니다. 하지만 종종 교량과 궤도의 시공온도가 다를 경우가 발생하며, 이 때 궤도의 솟음량은 완성계 해석이나 단계별 해석과 같은 해석방법에 의해 차이가 발생할 수 있습니다. 본 논문에서는 유한요소해석을 이용하여 완성계 해석과 단계별 해석에 따른 궤도의 솟음량을 분석하였습니다. In case of the concrete track on the special bridge such as arch bridge are subjected to the temperature variation, there is a some vertical displacement of the track. In general, construction temperature of bridges and tracks is equally controlled by considering the air temperature variation of the construction site. In some case, however, the construction temperature difference between the bridge and track may be occurred. In such cases, difference of the vertical displacement of the track may occur depending on the analysis method such as step by step analysis or completion stage analysis. In this paper, in order to investigate the vertical displacement of the track according to the step by step analysis and completion stage analysis, FE analysis are conducted.

금융연구(金融硏究) : 출자총액제한제도가 대기업 자산구성에 미치는 효과에 관한 연구

김민수 ( Min Su Kim ),성인모 ( In Mo Sung ),소종일 ( Jong Il So ) 한국금융학회 2012 금융연구 Vol.26 No.4

인덕턴스 변화 모델을 이용한 EMGF 출력 분석

김태신(Tae-Shin Kim),성인모(In-Mo Sung),양지혁(Ji-Hyuk Yang),유천열(Chun-Yeol),권오규(Oh-Kyu Kwon) 한국자기학회 2009 韓國磁氣學會誌 Vol.19 No.1

The Explosive Magnetic Generator of Frequency (EMGF) has been studied as a method to generate a strong microwave effectively through converting the explosion powder energy into the electromagnetic energy. However, the generated high frequency electromagnetic wave has not been explained clearly yet, for it is known to be difficult to analyze the high frequency electromagnetic wave oscillation using a simple time-varying equivalent circuit model. In this paper, we analyze the problems of the widely used inductance model with an exponential decreasing pattern and investigate the tendency of a more accurate inductance variation model using the finite element method of EMGF inductance by considering the magnetic compression effect. And we have shown via an EMGF output simulation that the new inductance variation model proposed here has an negative effect on EMGF output.

고속철도 교량 주거더의 솟음량에 대한 소고

이병길(Byoung-Kil Lee),강현성(Hyun-Sung Kang),성인모(In-Mo Sung),이진옥(Jin-Ok Lee),임남형(Nam-Hyung Rim) 한국철도학회 2013 한국철도학회 학술발표대회논문집 Vol.2013 No.11

철도 교량의 거더에는 시공 단계나 열차 운영단계에서 발생할 연직처짐에 대비하여 솟음(Camber)을 두며, 현재 국내 철도교량의 솟음량은 철도설계기준(노반편)에 따라 주거더의 고정하중에 의한 처짐량을 산정하여 적용하게 된다. 그러나, 주거더의 고정하중과 활하중의 1/2을 함께 고려하여 설계한 일부 고속철도 교량에서 과다한 솟음량으로 인해 궤도 PCL 층의 최소두께 확보가 곤란하였으며, 이로 인해 궤도 PCL 층의 구조적 안전성 문제를 야기하였다. 이에 따라 본 연구는 고속철도 교량 솟음 산정기준의 적정성에 대해 검토하였다. Camber is applied to girders of a railway bridge to prepare deflections by various loads on the construction or train operation. Also, camber of a railway bridge is applied to Railway Design Standard(Roadbed) to calculate the amount of dead load deflection on main girders. However, it has caused structural stability maintaining minimum thickness in track’s PCL designed excessive camber calculated the half of dead and live load in High-speed railway bridge. In this study, a suitability of camber prediction is analyzed on High-speed railway bridges.

온도하중과 차량하중을 고려한 레일체결장치 종방향 저항력의 특성

전병흔(Byeong-Heun Jeon),성인모(In-Mo Sung),지기환(Gee-Hwan Jee),임남형(Nam-Hyoung Lim) 한국철도학회 2014 한국철도학회 학술발표대회논문집 Vol.2014 No.5

장대레일 궤도가 철도교량 상에 위치하는 경우, 교량과 궤도의 상호작용에 의해 장대레일에는 추가적인 축력이 발생된다. 콘크리트궤도에서는 이러한 추가적인 축력을 레일체결장치를 통해 저항하게 되는데, 레일체결장치의 종방향 저항력 시험을 통해 궤도의 종방향 저항력을 산출해 낼 수 있다. 이와 같은 종방향 저항력은 UIC CODE 774-3R과 KR C-08080의 궤도편에 기술되어 있으며, 궤도-교량 상호작용 해석시 이 물성치를 사용하게 된다. 그러나 궤도-교량 종방향 상호작용 해석시 하중이력을 고려하기 위해서는 하중이력이 고려된 새로운 물성치의 개발이 필요하다. 본 연구에서는 온도하중과 차량하중을 고려한 레일체결장치 종방향 저항력의 특성을 제시한다. In the case of CWR(Continuous welded rail) located on the railway bridge, the CWR has additional axial force due to interaction of bridge and track. This additional axial force is transferred through rail fastener on the concrete track, so longitudinal resistance of track can be evaluated by longitudinal resistance test of rail fastener. Such a longitudinal resistance is described in the UIC CODE 774-3R and KR C-08080, and is used its properties when analyzing track-bridge interaction. But, the development of new properties is needed to consider load hysteresis when analyzing track-bridge longitudinal interaction. In this study, the characteristic of longitudinal resistance of rail fastener considering the temperature load and vehicle load is suggested.

거더 상판과 궤도가 분리된궤도-교량 상호작용모델 개발

최신형(Sin-Hyung Choi),성인모(In-Mo Sung),임남형(Nam-Hyoung Lim) 한국산학기술학회 2014 한국산학기술학회 학술대회 Vol.- No.-

무도상 궤도는 유도상 궤도와는 다르게 온도의 영향을 받는 콘크리트 슬래브로 구성이 되어있다. 현 재 궤도-교량 상호작용 해석시 해석의 간편화를 위하여 침목, TCL(Track Concrete Layer), PCL(Protection Concrete Layer)을 교량상판과 일체화하여 모델링을 하고 있다. 본 논문에서는 온도 하중으로 인한 상호작용 저감을 위해 궤도 슬래브와 교량 상판을 분리한 모델을 개발하였으며, TCL과 교량상판사이의 마찰력을 고려하기 위해 TCL을 궤도-교량 상호작용 모델에 적용하고 해석을 수행하 였다.

콘크리트 궤도와 교량 상판과의 종 방향 분리 정도에 따른 상호작용 특성

송대석(Dae-Seok Song),최신형(Sin-Hyung Choi),성인모(In-Mo Sung),임남형(Nam-Hyoung Lim) 한국철도학회 2014 한국철도학회 학술발표대회논문집 Vol.2014 No.5

철도 교량은 도로 교량과 달리 열차의 연직 하중, 시·제동 하중, 그리고 온도하중으로 인해 종 방향 하중이 일정 주기로 구조물에 전달된다. 이러한 종 방향 하중으로 인한 상호작용의 저감을 위해 궤도 슬래브와 교량 상판 사이에 슬라이드 층을 삽입한 LCPBT(Longitudinally Coupled Prefabricated Ballastless Track)를 사용하는 사례가 있다. 본 연구는 경간장 연장 및 연속화를 위한 연구로써 유한요소해석을 통하여 슬라이드층이 고려된 철도 교량의 콘크리트 궤도와 교량 상판과의 종 방향 분리 정도에 따른 종 방향 상호작용 저감효과를 분석 하였다. Unlike road bridge, longitudinal load caused by loads(vertical, braking, acceleration, temperature) is delivered to structure on a cycle in railway bridge. There is a case using LCPBT(Longitudinally Coupled Prefabricated Ballastless Track) inserted slide layer between concrete slave and bridge floor to reduce interaction effect according to longitudinal loads. It is needed to enhance the application of railway bridges with longer continuous span from now on. The purpose of this study is enhancing the application of railway bridges with longer continuous span, and reduction effect of railway bridge inserted slide layer is analysed using finite element analysis.