구조물의 진동 저감을 위한 퍼지 이론을 기반으로 한 제어시스템 개발

학위논문(박사) - 한국과학기술원 : 건설및환경공학과, 2006.2, [ xi, 149 p. ]This dissertation proposes effective, reliable and simple active, semiactive, and hybrid control algorithms based on fuzzy theory using active hydraulic actuators and semiactive MR dampers to reduce structural responses due to seismic and wind loads. Moreover, the simple semiactive fuzzy control system using a MR damper for vibration suppression of the building structure subjected to ground accelerations has been experimentally investigated by a shaking table test. A simple and efficient semiactive fuzzy control method using an MR damper is presented for seismic response reduction. Only one controller compared with a semiactive clipped-optimal controller which is very efficient controller to reduce seismic response using MR damper produces directly the desired command voltage using fuzzy rule inference as the desired force demanded is varied so that the actuator can produce forces as close as possible to the desirable forces. This type controller has all advantages of the fuzzy control algorithm in previous studies. The hybrid control systems combining active fuzzy controller using hydraulic actuators and semiactive fuzzy controller using MR dampers are implemented for bench-mark problem with linear elastomeric isolation system and nonlinear frictional isolation system, respectively. When a control method based on fuzzy algorithm to a structure is used for vibration reduction, it is inherent robust, easy to treat the uncertainties of input data from the ground motion and structural vibration sensors and able to handle the non-linear behavior of the structure because of no need of exact mathematical model of the structure easily. Therefore, the fuzzy algorithm could be applied simply to linear and nonlinear base isolated systems. An active/semiactive modal-fuzzy control method is presented for seismic response reduction. The major issue in this study is based on the fuzzy algorithm adding modal approach for seismic response reduction. In the case of combination ...한국과학기술원 : 건설및환경공학과

Algebraic method for computation of eigenpair sensitivities of damped systems with repeated eigenvalues

학위논문(석사) - 한국과학기술원 : 건설환경공학과, 2002.2, [ iv, 38 p. ]한국과학기술원 : 건설환경공학과

Application of Some Semiactive Control Algorithms to a Smart Base Isolated Building Employing MR Dampers

초록 This paper investigates the effectiveness of the MR damper-based control systems for seismic protection of base isolated building sturcutres employing some semiactive control algorithms, such as the modified clipped-optimal control, the maximum energy dissipation, and the modulated homogeneous friction, by examining the Phase I smart base isolated benchmark building problem. The results of the numerical simulations showed that most of the control systems considered herein could be beneficial in reducing seismic responses, especially base displacement or isolator deformation, of base isolated building structures. It is also verified that another version of the modified clipped-optimal control algorithm proposed in this study and the modulated homogeneous friction algorithm are more effective than other semiactive control algorithms

Seismic Performance Improvement of Base Isolated Buildings using Smart Passive Control System

본 연구에서는 면진 건물의 내진 성능을 개선하기 위하여 최근 개발된 스마트 수동 제어 시스템을 적용하고 이의 효용성을 수치 모의실험을 통해 검증하였다. 스마트 수동 제어 시스템은 효과적인 반능동 제어 장치로 알려진 MR 감쇠기에 전자기 유도부를 도입하여 응답 변화에 따라 MR 감쇠기로 입력되는 전류를 변화시킴으로써 MR 감쇠기의 감쇠 특성을 조절하는 새로운 개념의 스마트 제진 시스템이다. 스마트 수동 제어 시스템에서 전자기 유도부는 영구자석과 솔레노이드 코일로 구성되며, 기존 스마트 제진 시스템의 계측기, 제어기, 외부 전원장치를 한꺼번에 대체할 수 있다. 면진 건물에 대한 스마트 수동 제어 시스템의 내진 성능을 수치적으로 검증하기 위하여 미국토목학회에서 제시한 면진 건물에 대한 벤치마크 제어 문제를 활용하였다. 스마트 수동 제어 시스템의 제진 성능을 MR 감쇠기를 이용한 기존 스마트 제어 시스템의 성능과 비교하였다. 수치 모의실험 결과를 통해 스마트 수동 제어 시스템이 면진 건물의 내진 성능을 개선하는 데 매우 유용함을 확인하였다