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H<SUB>∞</SUB> 제어알고리즘에 의한 능동형질량제진장치의 성능평가 연구
이헌재(Lee Heon-Jae),심학보(Shim Hak-Bo),정형조(Jung Hyung-Jo),박순전(Park Soon-Jeon),김상대(Kim Sang-Dae) 대한건축학회 2009 大韓建築學會論文集 : 構造系 Vol.25 No.4
This paper presents an application of the active mass damper (AMD) system to the high-rise building structure. The AMD system was installed at the top of the building already in use. The building has five basement floors with SRC structural system and 26 floors with steel structure system, and which makes inherent low damping ratio. The preliminary field measurement was performed and additionally the wind tunnel test was carried out. The H-infinity(H∞) control algorithm has been developed to utilize the maximum capacity of the AMD system. From the results of numerical simulation using the wind load obtained from the wind tunnel tests, it was found that the maximum acceleration responses of the building were reduced significantly. The acceleration responses at the top of the building in the controlled case measured under strong wind loads were compared with those in the uncontrolled case numerically simulated by using the wind load deduced from the measured data and a structural model of the building. It is demonstrated that the H-infinity control algorithm shows good control performance in reducing the building accelerations. This paper mainly focuses on the H-infinity control algorithm performance test of the building already in use under the strong winds due to typhoon NARI in 2007.
심내막염 환자의 동종대동맥편을 이용한 대동맥 근부 치환술 - 1례 보고 -
임창영,이헌재,Im, Chang-Yeong,Lee, Heon-Jae 대한흉부심장혈관외과학회 1997 Journal of Chest Surgery (J Chest Surg) Vol.30 No.8
세균성 심내막염에 의한 대동맥판 폐쇄부전의 수술치료에 있어서, 우수한 혈역학적 기능과 염증에 대한 높은 저항력 때문에 동종대동맥판을 사용한 수술이 우선적으로 고려되고 있다. 수술방법중에서 대동 맥근부 치환술이 관상동맥하 부착법에 비하여 술 후 대동맥관 폐쇄부전이 적게 발생하는 장점을 갖는다. 46세의 남자가 세균성 심내막염에 의한 급성 대동백판 폐쇄부전 및 심부전으로 내원하였다. 내과적 치료에 반응하지 않고 심부전이 점차 심해져서 20 m동종대동맥편을 이용한 대동맥근부 치환수술을 응급으로 시행하였다. 수술소견상 우관상판첨에 구멍이 나 있었고 좌, 우관상판첨사이의 교련에 심한 석회화가 있었다. 수술후 환자는 순조로이 회복되었고 심초음파검사상 이식된 동종동맥 판의 폐쇄부전소견 은 발견되지 않았다. 염증소견들도 술 후 8주간의 항생제투여로 소실되었다. 약물치료로 조절되지 않는 세균성 심내막염에 의한 급성 대동맥판 폐쇄부전을 동종동맥 판을 사용한 대동맥근부 치환수술로써 성 공적으로 치료하였다. Aortic valve replacement with aortic allograft has been considered a treatment of choice for aortic valve disease secondary to bacterial endocarditis because of its good homodynamic performance and higher resistance to infection. The aortic root replacement technique might be superior to the subcoronary allograft implantation technique with regard to aortic regurgitation. A 46 yea,rs old male patient had acute aortic regurgitation with progressing heart failure secondary to acute bacterial endocarditis. The patient underwent emergent aortic root replacement using 20 mm aortic allograft. At operation, right coronary cusp perforation and heavy calcification of commissure between right and left coronary cusp were observed. The patient recovered well and postoperative echocardiography demonstrated no aortic regurgitation. Inflammatory signs were subsided after 8 weeks of antibiotics therapy. Medically uncontrolled acute bacterial endocarditis was treated successfully by aortic root replacement using aortic homograft.
대형 MR감쇠기가 설치된 건축구조물의 실시간 하이브리드 실험 및 준능동 알고리즘 적용
박은천,이성경,이헌재,문석준,정형조,민경원,Park, Eun-Churn,Lee, Sung-Kyung,Lee, Heon-Jae,Moon, Suk-Jun,Jung, Hyung-Jo,Min, Kyung-Won 한국전산구조공학회 2008 한국전산구조공학회논문집 Vol.21 No.5
실시간 하이브리드 실험법(real-time hybrid testing method)은 구조물의 수치해석부와 실험부 부분구조를 운동방정식으로 통합하여 실시 간으로 동시에 계산과 실험을 수행하는 방법이다 본 연구는 실시간 하이브리드 실험법을 사용하여 수동 및 준능동 MR감쇠기가 설치된 건축구조물의 내진성능을 정량적으로 평가한다. 건물 모델은 실물 크기 5층 건물을 강제진동실험 결과를 통해 식별한 수치모델로 사용하였고, MR감쇠기는 실험적 부분구조르 UTM에 설치되었다. 본 연구에서 수행되는 실시간 하이브리드 실험은 사인파 및 지진파 가진을 통하여 얻은 결과와 전류에 따른 MR감쇠기의 제어력을 이용하여 얻은 Bouc-Wen모델을 사용하여 얻은 해석모델과 일치함으로 그 유효성을 입증하였다. 또한 예비연구로써 구조물의 응답을 최적으로 제어하기 위한 clipped-optimal 제어알고리즘과 modulated homogeneous friction 준능동 제어알고리즘을 MR감쇠기에 적용하였다. 각 전류별 Bouc-Wen모델을 곡선맞춤하여 각각의 Bouc-Wen모델 파라미터를 식별하였으며 그 결과를 준능동 제어알고리즘 수치해석에 적용하였다. 또한 실시간 하이브리드 실험법을 이용한 준능동 제어 실험결과와 해석결과를 비교하여 준능동 제어알고리즘의 성능을 평가함에 있어 실시간 하이브리드 실험이 합리적임을 보여준다. The real-time hybrid testing method(RT-HYTEM) is a structural testing technique in which the numerical integration of the equation of motion for a numerical substructure and the physical testing for an experimental substructure are performed simultaneously in real-time. This study presents the quantitative evaluation of the seismic performance of a building structure installed with an passive and semi-active MR damper by using RT-HYTEM. The building model that was identified from the force-vibration testing results of a real-scaled 5-story building is used as the numerical substructure, and an MR damper corresponding to an experimental substructure is physically tested by using the universal testing machine(UTM). The RT-HYTEM implemented in this study is validated because the real-time hybrid testing results obtained by application of sinusoidal and earthquake excitations and the corresponding analytical results obtained by using the Bouc-Wen model as the control force of the MR damper respect to input currents were in good agreement. Also for preliminary study, some semi-active control algorithms were applied to the MR damper in order to control the structural responses optimally. Comparing between the test results of semi-active control using RT-HYTEM and numerical analysis results show that the RT-HYTEM is more resonable than numerical analysis to evaluate the performance of semi-active control algorithms.
심학보(Shim Hak-Bo),이헌재(Lee Heon-Jae),정형조(Jung Hyung-Jo),박순전(Park Soon-Jeon),김상대(Kim Sang-Dae) 대한건축학회 2009 大韓建築學會論文集 : 構造系 Vol.25 No.2
This paper presents an application of the active mass damper (AMD) system to a high-rise building structure. The building has five basement floors with SRC structural system and 26 floors with steel structure system, and which makes inherent low damping ratio. To figure out the reason of the occupants’ discomfort, the preliminary field measurement was performed and additionally the wind tunnel test was carried out. The AMD system was selected to reduce the wind-induced vibration so that the serviceability of the building is assured. It is the first application of AMD for residential building in the country. Usually, the vibration control devices have been planned and implemented during construction stage. On the other hand, in this project the AMD system was implemented to the building in-use and this may be the first full-scale application of AMD to the existing building in the world. The two AMDs were implemented in June 2007 and the performance tests were also carried out. This paper mainly focuses on the performance test under the strong winds due to typhoon NARI in 2007.
H<SUP>∞</SUP> 제어알고리즘에 의한 AMD 시스템의 제진성능향상
심학보(Shim Hak-Bo),이헌재(Lee Heon-Jae),박순전(Park Soon-Jeon),김상대(Kim Sang-Dae) 대한건축학회 2008 대한건축학회 학술발표대회 논문집 - 계획계/구조계 Vol.28 No.1(구조계)
High rise buildings vibrate sensitively by the strong wind with reduction of weight and damping ratio recently. As increased the high rise buildings, a lot of people appeal the problems in serviceability caused by intensive vibration of building when strong wind has passed. In this paper, the active mass damper (AMD) which adopts the H∞ control algorithm is designed and applied to a exist building structure. This may be the first full-scale application of AMD to the existing building in the world. Two AMDs, which have 20 ton mass and 10 ton mass for x-axis and y-axis, respectively, are installed on the roof of the builidng structure, and those AMDs are design to control not only transverse response but also even torsion responses. In order to verify the performance of the AMD system, the controlled responses of the building structure are measured during a typhoon passes through the Korean Peninsula and compared with the uncontrolled responses obtained by a numerical simulation.