Neuro-Control of Seismically Excited Structures using Semi-active MR Fluid Damper

반능동 MR 유체 감쇠기를 이용한 지진하중을 받는 구조물의 신경망제어

  • 이헌재 (한국과학기술원 건설ㆍ환경공학과) ;
  • 정형조 (한국과학기술원 건설ㆍ환경공학) ;
  • 오주원 (한남대학교 토목공학) ;
  • 이인원 (한국과학기술원 건설ㆍ환경공학과)
  • Published : 2002.10.01

Abstract

A new semi-active control strategy for seismic response reduction using a neuro-controller and a magnetorheological (MR) fluid damper is proposed. The proposed control system consists of the improved neuro-controller and the bang-bang-type controller. The improved neuro-controller, which was developed by employing the training algorithm based on a cost function and the sensitivity evaluation algorithm replacing an emulator neural network, produces the desired active control force, and then the bang-bang-type controller causes the MR fluid damper to generate the desired control force, so long as this force is dissipative. In numerical simulation, a three-story building structure is semi-actively controlled by the trained neural network under the historical earthquake records. The simulation results show that the proposed semi-active neuro-control algorithm is quite effective to reduce seismic responses. In addition, the semi-active control system using MR fluid dampers has many attractive features, such as the bounded-input, bounded-output stability and small energy requirements. The results of this investigation, therefore, indicate that the proposed semi-active neuro-control strategy using MR fluid dampers could be effectively used for control of seismically excited structures.

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