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논문 기본 정보

자료유형
학술저널
저자정보
Loh, Chin-Hsiung (Department of Civil Engineering, National Taiwan University) Liu, Yi-Cheng (Department of Civil Engineering, National Taiwan University) Ni, Yi-Qing (Department of Civil and Structural Engineering, The Hong Kong Polytechnic University)
저널정보
테크노프레스 Smart structures and systems Smart structures and systems 제10권 제4호
발행연도
2012.1
수록면
331 - 351 (21page)

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In this study an output-only system identification technique for civil structures under ambient vibrations is carried out, mainly focused on using the Stochastic Subspace Identification (SSI) based algorithms. A newly developed signal processing technique, called Singular Spectrum Analysis (SSA), capable to smooth a noisy signal, is adopted for preprocessing the measurement data. An SSA-based SSI algorithm with the aim of finding accurate and true modal parameters is developed through stabilization diagram which is constructed by plotting the identified system poles with increasing the size of data matrix. First, comparative study between different approaches, with and without using SSA to pre-process the data, on determining the model order and selecting the true system poles is examined in this study through numerical simulation. Finally, application of the proposed system identification task to the real large scale structure: Canton Tower, a benchmark problem for structural health monitoring of high-rise slender structures, using SSA-based SSI algorithm is carried out to extract the dynamic characteristics of the tower from output-only measurements.

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