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김충길 ( Kim Chunggil ),허광희 ( Heo Gwanghee ),전준용 ( Jeon Joonryong ),전승곤 ( Jeon Seunggon ),오주원 ( Oh Juwon ) 한국구조물진단유지관리공학회 2009 한국구조물진단유지관리공학회 학술발표대회 논문집 Vol.13 No.2
This paper is concerned with the control of the harmful vertical vibration occurring on a cable-stayed bridge, a type of large structure bridges. For the control, we designed a model structure of the bridge and a shear type MR damper. With those, vibration control experiments were performed and evaluated under various conditions: non-control, clipped-optimal control, and passive off and passive on the last two of which were added to evaluate the clipped-optimal control. As a result of the experiments, displacement and acceleration on the middle span were obtained, and from those were derived maximum displacement and maximum acceleration by which control performance was also evaluated. Additionally, each different voltage consumed at the moment of control was compared each other. Finally, it is proven that the clipped-optimal control method was functionally and economically effective in the case where such a semi-active control device as MR damper was employed in the control of a cable-stayed bridge.
김충길(Kim, Chunggil),허광희(Heo, Gwanghee),전준용(Jeon, Joonryong),전승곤(Jeon, Seunggon),오주원(Oh, Juwon) 한국구조물진단유지관리학회 2009 한국구조물진단학회 학술발표회논문집 Vol.2009 No.2
This paper is concerned with the control of the harmful vertical vibration occurring on a cable-stayed bridge, a type of large structure bridges. For the control, we designed a model structure of the bridge and a shear type MR damper. With those, vibration control experiments were performed and evaluated under various conditions: non-control, clipped-optimal control, and passive off and passive on the last two of which were added to evaluate the clipped-optimal control. As a result of the experiments, displacement and acceleration on the middle span were obtained, and from those were derived maximum displacement and maximum acceleration by which control performance was also evaluated. Additionally, each different voltage consumed at the moment of control was compared each other. Finally, it is proven that the clipped-optimal control method was functionally and economically effective in the case where such a semi-active control device as MR damper was employed in the control of a cable-stayed bridge.
MR 댐퍼를 이용한 비대칭 사장교의 지진 진동제어 성능평가
허광희,김충길,공영이,Heo, Gwanghee,Kim, Chunggil,Gong, Yeong I 대한토목학회 2014 대한토목학회논문집 Vol.34 No.3
비대칭 사장교에 지진으로 인한 진동을 MR(Magneto-rheological) 댐퍼를 이용하여 효과적으로 제어하는 연구를 수행하였다. MR 댐퍼의 실용적인 사용성을 높이기 위하여 비대칭 사장교 구조물을 설계/제작하고, 이 교량구조물을 적정하게 제어할 수 있도록 MR 댐퍼를 제작하였다. El-centro 지진파로 비대칭 사장교를 수평방향으로 가진하여 수직방향과 수평방향의 진동을 제어하는 실험을 하였다. 각 방향의 진동제어 실험에 5가지의 제어 조건으로 MR 댐퍼의 제어성능을 평가 하였다. 실험결과 MR 댐퍼는 지진진동으로 인한 비대징사장교를 진동제어 하기 위하여 Lyapunov Control 알고리즘과 Clipped-optimal control 알고리즘을 이용하여 제어를 할 경우, 보다 효과적으로 진동을 제어하는 것을 알 수 있었다. 그리고 구조물의 비대칭성과 수평 가진으로 인하여 수직 및 수평 방향의 진동제어가 서로 다른 제어효과를 보였다. 이와 같은 제어효과는 비대칭 사장교와 같은 유연하며 비대칭인 구조물에 준능동의 MR 댐퍼가 효과적으로 지진진동을 제어하는 것으로 평가되었다. A study has been carried out that effectively controls the vibration of asymmetric cable-stayed bridges caused by earthquakes with MR dampers. In order to enhance the practical serviceability of MR dampers, an asymmetric cable-stayed bridge structure has been designed and produced, and a MR damper has been produced so as to have this bridge structure controlled appropriately. An experiment that controls vertical and horizontal vibrations has been carried out by exciting the asymmetric cable-stayed bridge in the horizontal direction with the El-centro seismic wave. The control performance of the MR damper has been evaluated under the five control conditions in the experiments of vibration control in each direction. As a result of the experiment, MR dampers were proved to control vibrations more effectively when either Lyapunov control algorithm or Clipped-optimal control algorithm was used to control vibrations of the asymmetric cable-stayed bridge caused by earthquakes. In addition, different controlling effects were found in vibration controls in vertical and horizontal directions due to the asymmetry of the structure and the horizontal excitation. With such controlling effects, semi-active MR dampers are evaluated to effectively control vibrations caused by earthquakes in flexible and asymmetric structures such as asymmetric cable-stayed bridges.
지진하중을 받는 사장교의 상태평가를 위한 새로운 통계적 패턴 인식 기술
허광희,김충길,Heo, Gwanghee,Kim, Chunggil 대한토목학회 2014 대한토목학회논문집 Vol.34 No.3
마할라노비스 거리 이론에 기초한 통계적 패턴 인식 기술은 안정된 외부하중에 대한 구조물 상태 평가에 대한 유용성에도 불구하고 지진과 같이 큰 변동성의 외부하중에 대한 구조물의 건전도 모니터링에는 취약하다. 손상은 일반적으로 손상되지 않은 구조물의 측정된 값의 평균과 손상된 구조물의 측정값 사이의 차이에 의해 결정된다. 외부 하중의 변동성이 커질수록 더 큰 차이가 발생하고, 이는 손상으로 인식되기 쉽다. 본 논문에서는 이러한 문제를 극복하고 불확실한 외부 하중을 받는 구조물을 지속적으로 모니터링 할 수 있도록 외부 변동성을 감소시키기 위해 마할라노비스 거리 이론을 수정한 통계적 패턴 인식 기술인 개선된 마할라노비스 거리 이론을 개발하였다. 이 방법은 일반적인 임의의 하중과 지진하중에서 정확하게 사장교의 건전도를 평가하는 것을 실험적으로 확인 하였다. 그 결과, IMDT는 손상되지 않은 케이블로부터 획득한 데이터로 손상된 케이블에 의한 구조물의 손상을 파악하는 데 유효한 것을 확인하였다. 따라서 변동성을 지닌 외부하중에 의한 교량의 건전도 모니터링에 효과적으로 적용할 수 있음을 입증하였다. In spite of its usefulness for health monitoring of structures on steady external load, the statistical pattern recognition technology (SPRT), based on Mahalanobis distance theory (MDT), is not good enough for the health monitoring of structures on large variability external load like earthquake. Damage is usually determined by the difference between the average measured value of undamaged structure and the measure value of damaged one. So when external variability gets larger, the difference gets bigger along, which is thus easily mistaken for a damage. This paper aims to overcome the problem and develop an improved Mahalanobis distance theory (IMDT), that is, a SPRT with revised MDT in order to decrease external variability so that we will be able to continue to monitor the structure on uncertain external variability. This method is experimentally tested to see if it precisely evaluates the health of a cable-stayed bridge on each general random load and earthquake load. As a result, the IMDT is found to be valid in locating structural damage made by damaged cables by means of data from undamaged cables. So it is proved to be effectively applicable to the health monitoring of bridges on external load of variability.
허광희(Heo, Gwanghee),김충길(Kim, Chunggil),전준용(Jeon, Joonryong),오주원(Oh, Juwon) 한국구조물진단유지관리학회 2010 한국구조물진단학회 학술발표회논문집 Vol.2010 No.1
This research aims to develop a system of wireless bidirectional communication between structure and a maintenance host as a preceding process eventually for the development of a system of unified wireless control for structural vibration which is made to acquire data from the structure and transmit them wirelessly to the main control system. For the purpose, all different types of data are made possible to be obtained by a unified wireless measurement system, and also a main control system is built to manage the unified wireless measurement system itself, and monitor and preserve the data. As for its performance, it is confirmed by means of various kinds of measuring appliance that data are successfully transmitted wirelessly and bidirectionally. Finally, it is also proven that the wireless bidirectional communication system would directly contribute to the development of a system of unified wireless control for structural vibration in the future.
허광희(Heo, Gwanghee),김충길(Kim, Chunggil),전준용(Jeon, Joonryong),오주원(Oh, Juwon),전승곤(Jeon, Seunggon) 한국구조물진단유지관리학회 2010 한국구조물진단학회 학술발표회논문집 Vol.2010 No.2
This paper aims to design a wireless control & communication system for the control of structural vibration and prove its functional effectiveness. This system is composed of a wireless measurement system acquiring the response of structure and a control system which analyzes the response signals of structure and thus controls the structural vibration. Essentially it as a central administration manages and controls the overall system. Also it wirelessly transmits data. In order to prove the effectiveness of the wireless control & communication system, the functions of analogy input and analogy output were verified. Especially the experiments for the test of analogy input and analogy output were performed ten times under each different condition. The comparison of the data from the experiments with those of a wired measurement system proved its outstanding effectiveness. It was thus found that the wireless control & communication system developed in this research would possibly control the vibration with the feedback signals after sending out proper output signals to the vibration control of structure.
통계적 패턴 인식 기술을 이용한 교량의 실시간 손상평가 기술 개발
허광희 ( Heo Gwanghee ),김충길 ( Kim Chunggil ),방건혁 ( Bang Geonhyeok ),김용석 ( Kim Yongsuk ),고병찬 ( Ko Byeongchan ) 한국구조물진단유지관리공학회 2018 한국구조물진단유지관리공학회 학술발표대회 논문집 Vol.22 No.2
In this paper, real-time damage assessment technology was developed for detection the damage of bridges in real time and the performance of the developed technology was verified by vibration test. Real-time damage assessment technology was developed by combining statistical pattern recognition technology and simulation technology. In order to verify the developed technology, the earthquake response acquisition experiment was conducted according to the cable damage of the model cable-stayed bridge. As a result, it was confirmed that the developed real-time damage assessment technology can provide information on the location of damaged cable.
허광희 ( Heo Gwanghee ),김충길 ( Kim Chunggil ),방건혁 ( Bang Geonhyeok ),이진옥 ( Lee Chinok ),박채린 ( Park Chaerin ) 한국구조물진단유지관리공학회 2018 한국구조물진단유지관리공학회 학술발표대회 논문집 Vol.22 No.2
In this paper, a hydraulic damper was developed to protect the storage racks from earthquakes and the seismic performance of the storage racks was improved by applying the developed damper. In order to achieve these goals, the control capacity for the safety of the storage racks was determined, and a hydraulic damper satisfying the control capacity was designed and manufactured. In addition, the location of the hydraulic damper was determined through simulation. Finally, the shaking table test was carried out. As a result, the seismic performance improvement of the storage racks using the hydraulic damper was confirmed.