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Structural Engineering and Mechanics   Volume 38, Number 3, May10 2011, pages 315-332
DOI: https://doi.org/10.12989/sem.2011.38.3.315
 
The combined deterministic stochastic subspace based system identification in buildings
Pelin Gundes Bakir

 
Abstract     [Buy Article]
    The Combined Deterministic Stochastic Subspace based System Identification Technique (CDSSSIT) is a powerful input-output system identification technique which is known to be always convergent and numerically stable. The technique determines a Kalman state sequence from the projection of the output-input data. The state space matrices are determied subsequently from this Kalman state sequence using least squares. The objective of this paper is to examine the efficiency of the CDSSSIT in identifying the modal parameters (frequencies and mode shapes) of a stiff structure. The results show that the CDSSSIT predicts the modal parameters of stiff buildings quite accurately but is very sensitive to the location of sensors.
 
Key Words
    system identification; optimal sensor placement; structural health monitoring; subspace based system identification.
 
Address
Pelin Gundes Bakir: Department of Civil Engineering, Istanbul Technical University, Adnan Saygun Cad., Selin apt. No:15-9, D:13, Ulus, Besiktas, Istanbul, Turkey
 

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