진동수영역 상태변수를 이용한 구조물의 동적하중 추정
Dynamic Force Identification of a Structure Using State Variable in the Frequency Domain
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초록
본 연구의 목적은 시스템 식별기술과 칼만필터링을 기반으로 계측된 가속도응답을 이용하여 구조물에 작용하는 모달하중을역으로 추정하는 기법을 제시하는데 있다. 하중추정 과정에서 가속도응답은 모드응답으로 분해되며 각 모드응답에 대한 모달하중을역으로 추정한다. 역해석과정에서 발생하는 ill-posed문제를 피하기 위하여 가상진동기에 의해 구조물의 고유진동수와 감쇠비를 보다정밀하게 구하기 위한 시스템 식별법을 사용하였다. 본 연구에서 제안된 기법의 적용성을 위하여 40층의 철골구조물에 태풍이 작용 했을 때 계측된 가속도를 사용하였다. 적용결과에 의하면 본 연구에서 제안된 하중추정법에 의하여 모달하중 추정이 가능함을 알 수 있었다.
Abstract
The aim of this work is to investigate the applicability of a force identification technique using only the accelerationresponses measured from a structure while taking into account Kalman filtering and a system identification techniques. Under the forceidentification framework of this study, the measured acceleration responses are decomposed into modal acceleration responses, andthen, the corresponding external modal forces are inversely estimated from the decomposed modal responses with the assistance of theKalman filtering. In order to avoid the ill-posed problem in the inverse analysis as much as possible, the natural frequency and dampingratio of the each mode are precisely identified by virtual dynamic shaker before applying the force identification technique. For theverification of the proposed framework, the force identification process is applied to the acceleration responses measured from a 40story steel framed building structure during a typhoon passage. From the numerical simulation results, it is found that the modal windload can be identified with the proposed modal force estimation method.
참고문헌 (12)
- Lu, Z. R., "Force identification based on sensitivity in time domain", Journal of Engineering Mechanics, 132(10), pp.1050~1056 (2006)
- Liu, Y., "Dynamic force identification based on enhanced least squares and total least-squares schemes in the frequency domain", Journal of Sound and Vibration, 282, pp.37~60 (2015)
- Law, S. S., "Time-varying wind load identification from structural responses", Engineering structure, 27, pp.1586~1598 (2005)
- Sanchez, J., "Review of force reconstruction techniques", Journal of Sound and Vibration, 333, pp.2999~3018 (2014)
- Jia, Y., "Random dynamic load identification based on error analysis and weighted total least squares method", Journal of Sound and Vibration, 358, pp.111~123 (2015)
- Niu, Y., "Online Simultaneous Reconstruction of Wind Load and Structural Responses-Theory and Application to Canton Tower", Computer-Aided Civil and Infrastructure Engineering, 30, pp.666~681 (2015)
- Sun, H., "Statistical Regularization for Identification of Structural Parameters and External Loading Using State Space Models", Computer-Aided Civil and Infrastructure Engineering, 30, pp.843~858 (2015)
- Liu, J.J., "Input force estimation of a cantilever plate by using a system identification technique", Computer methods in applied mechanics and engineering, 190, pp.1309~1322 (2000)
- Ma, C. K., "Input forces estimation of beam structures by an inverse method", Journal of sound and vibration, 259(2), pp.387~407 (2003)
- Ma, C. K., "An inverse method for the estimation of input forces acting on non-linear structural system", Journal of sound and vibration, 275, pp.953~971 (2004)
- 황재승, "비고전 감쇠를 가지는 구조물의 가속도응답을 이용한 새로운 모드분리 기법", 대한건축학회논문집 구조계, 31(1), pp.19~26 (2015), 대한건축학회[DOI]
- 황재승, "가상 질량 동조기에 의한 구조물의 감쇠비 추정", 한국풍공학회지, 20(1), pp.65~70 (2016), 한국풍공학회