Earticle

초록

영어

A Control of the vibrations induced from the earthquake can be accomplished for the multiple story buildings using various optimal control methods. Linear Quadratic(LQ) control method may be feasible provided all state variables of the system can be measured, which is not always possible and practical. However, it has attractive features of infinite gain margin and phase margin greater than 60 degrees. The gain margin and phase margin indicate how robustly stable the closed loop system behaves with uncertainties such as system noise and modeling errors. State feedback control system can be implemented with the only measurable states if constructed in Linear Quadratic Gaussian(LQG) algorithm. It requires an observer to estimate the state variables based on the measured one, but loses the entire gain margin due to the Kalman filter adapted in the algorithm. The H-infinity control may overcome the shortcomings of the LQG with emphasized robustness features against the uncertainties, but it usually ends up with very complicated control system to implement. LQG with loop transfer recovery (LQG/LTR) method is applied in this study to retain the moderate level of stability robustness while keeping the observer alive. The results showed that the LQG/LTR control reduced the relative displacement in the base isolated floor as effectively as the LQG control with moderate level of the gain margin
recovered.

목차

Abstract
 1. 서론
  1.1 연구의 배경 및 목적
  1.2 연구의 방법 및 절차
 2. 시스템 모델링
  2.1 시스템의 운동방정식
  2.2 시스템의 상태공간방정식
  2.3 가제어성, 안정가능성 및 가관측성
 3. 제어시스템 설계
  3.1 LQ 제어시스템의 주파수 특성
  3.2 LQG/LTR 제어 알고리즘
 4. 제어 응답 특성
  4.1 LQG 제어시스템 설계에 따른 응답 특성
  4.2 LQG/LTR 제어시스템 설계에 따른 응답 특성
 5. 결론
 참고문헌

저자

• 홍재률 [ Hong Jae-Youl | 정회원. 동의대학교 건축공학과 석사과정 ]
• 이진호 [ Lee Jin-Ho | 정회원. 동의대학교 건축공학과 부교수 ]

참고문헌