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Design of an actuator for simulating wind-induced response of a building structure
Park, Eun Churn,Lee, Sang-Hyun,Min, Kyung-Won,Chung, Lan,Lee, Sung-Kyung,Cho, Seung-Ho,Yu, Eunjong,Kang, Kyung-Soo Techno-Press 2008 Smart Structures and Systems, An International Jou Vol.4 No.1
In this paper, excitation systems using a linear mass shaker (LMS) and an active tuned mass damper (ATMD) are presented to simulate the wind induced responses of a building structure. The actuator force for the excitation systems is calculated by using the inverse transfer function of a target structural response to the actuator. Filter and envelop functions are used to prevent the actuator from exciting unexpected modal responses and an initial transient response and thus, to minimize the error between the wind and actuator induced responses. The analyses results from a 76-story benchmark building problem for which the wind load obtained by a wind tunnel test is given, indicate that the excitation system installed at a specific floor can approximately reproduce the structural responses induced by the wind load applied to each floor of the structure. The excitation system designed by the proposed method can be effectively used for evaluating the wind response characteristics of a practical building structure and for obtaining an accurate analytical model of the building under wind load.
실시간 하이브리드 실험법을 이용한 대형 MR감쇠기의 제진 성능평가
박은천(Park, Eun-Churn),이성경(Lee, Sung-Kyung),윤경조(Youn, Kyung-Jo),정희산(Chung, Hee-San),이헌재(Lee, Heon-Jae),최강민(Choi, Kang-Min),문석준(Moon, Suk-Jun),정형조(Jung, Hyung-Jo),민경원(Min, Kyung-Won) 한국소음진동공학회 2008 한국소음진동공학회 논문집 Vol.18 No.1
This paper presents real-time hybrid test method of large-scale MR damper applied to a building structure under seismic excitation. The real-time hybrid test using an actuator for the control performance evaluation of a MR damper controlling the response of earthquake-excited building structure is experimentally implemented. In the test, the building structure is used as a numerical part, on which a large-scale MR damper adopted as an experimental part was installed to reduce its response. At first, the force that is acting between a MR damper and building structure is measured from the load cell attached on the actuator system and is fed-back to the computer to control the motion of the actuator. Then, the actuator is so driven that the error between the interface displacement computed from the numerical building structure with the excitations of earthquake and the fed-back interface force and that measured from the actuator. The control efficiency of the MR damper used in this paper is experimentally confirmed by implementing this process of experiment on real-time.
System Identification Method of a Real-Scaled 5 Story Building Structure Using a Hybrid Mass Damper
Lee, Sang-Hyun,Park, Eun-Churn,Youn, Kyung-Jo,Lee, Sung-Kyung,Min, Kyung-Won 단국대 부설 리모델링연구소 2007 리모델링 연구소 논문집 Vol.5 No.1
Forced vibration testing is important for correlating the mathematical model of a structure with the realone and for evaluating the performance of the real structure. There exist various techniques available for evaluating the seismic performance using dynamic and static measurements. In this paper, full scale forced vibration tests simulating earthquake response are implemented by using a hybrid mass damper. The finite element(FE) model of the structure was analytically constructed using ANSYS and the model was updated using the results experimentally measured by the forced vibration test. System identification of real-scaled 5 story building structure which is located in UNISON INC. is conducted on the updated FE model.
Sung-Kyung Lee,Eun Churn Park,Kyung-Won Min,Sang-Hyun Lee,Ji-Hun Park 대한기계학회 2007 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.21 No.6
In this study, the real-time hybrid test using a shaking table for the control performance evaluation of a U-shaped tuned liquid column damper (TLCD) controlling the response of earthquake-excited building structure is experimenttally implemented. In the test, the building structure is used as a numerical part, on which a U-shaped TLCD adopted as an experimental part was installed to reduce its response. At first, the force that is acting between a TLCD and building structure is measured from the load cell attached on shaking table and is fed-back to the computer to control the motion of shaking table. Then, the shaking table is driven such a manner that the error between the interface acceleration computed from the numerical building structure under the excitations of earthquake and the fed-back interface force and that measured from the shaking table. The control efficiency of the TLCD used in this paper is experimentally confirmed by implementing this process of shaking table experiment on real-time.
Lee, Sang-Hyun,Park, Eun-Churn,Youn, Kyung-Jo,Min, Kyung-Won,Chung, Lan 단국대 부설 리모델링연구소 2006 리모델링 연구소 논문집 Vol.4 No.2
This paper presents vibration control of a real-scaled five-story steel structure subjected to horizontal excitation using a semi-active magneto-rheological (MR) damper. A large-sized double-rod MR damper, which is applicable for vibration control of the real-scaled five-story structure, is designed and manufactured on the basis of the field-dependent Bingham model of the MR fluid. The damping force of the MR damper is experimentally evaluated with respect to the excitation frequency at various magnetic fields. After formulating the governing equation of motion for the five-story structure associated with the MR damper, displacement and acceleration responses of the structure are discussed under pseudo earthquake excitation in which a hybrid mass damper is designed to reproduce seismically excited structural responses. The controllers which require only structural response of the damper installed floor for calculating the input current of the MR damper are designed to effectively suppress unwanted structural vibrations
Control Performance Evaluation of an MR Damper by Real-Time Hybrid Testing Technique
Lee, Sung-Kyung,Park, Eun-churn,Min, Kyung-Won 단국대 부설 리모델링연구소 2008 리모델링 연구소 논문집 Vol.6 No.2
Real-time hybrid testing technique (RT-HYTT) is a structural dynamic testing method that the numerical calculation of the equations of motion of a structure and the experimental measurement of the reaction forces resulting from the application of this motion to the numerical structure are simultaneously implemented in real time. In this paper, structural control performance of the magneto-rheological (MR) damper installed in a real-scaled 5 story building is experimentally evaluated through real-time hybrid test method. In this method, a numerical substructure is based on a structural model identified from the forced vibration testing results of a real-story building, and an MR damper that is used as an experimental substructure is physically tested with a universal testing machine (UTM). In the test, load cell on the UTM measure the force necessary to attain the required story displacement and these structural reaction forces are returned to the computer for use in next time step calculation of a numerical structural model. Test results show that the higher level of control force generated by the Mr damper causes the lower level of controlled response of a structure.
준능동 MR감쇠기가 설치된 실물크기 구조물의 분산제어 알고리즘 성능평가
윤경조(Youn, Kyung-Jo),박은천(Park, Eun-Churn),이헌재(Lee, Heon-Jae),문석준(Moon, Seok-Jun),민경원(Min, Kyung-Won),정형조(Jung, Hyung-Jo),이상현(Lee, Sang-Hyun) 한국소음진동공학회 2008 한국소음진동공학회 논문집 Vol.18 No.2
In this study, seismic response control performance of decentralized response-dependent MR damper which generates the control force using only the response of damper-installed floor, was experimentally investigated through the tests of a full-scale structure installed with large MR dampers. The performance of the decentralized control algorithm was compared to those of the centralized ones such as Lyapunov, modulated homogeneous friction, and clipped-optimal control. Hybrid mass damper were controlled to induce seismic response of the full-scale structure under El Centro earthquake. Experimental results indicated that the proposed decentralized MR damper provided superior or equivalent performance to centralized one in spite of using damper-installed floor response for calculating input voltage to MR damper.