Abstract
The application of system identification methods to a number of civil engineering structures is increasing in order to improve the understanding of actual structural behaviors and augment traditional analytical assessments. The identification methods are typically used to determine structural dynamics properties (frequencies, damping ratios and mode shapes) and detection of local structural damages and deterioration. This paper presents two frequency domain system identification methods for determining structural vibration properties: eigensystem realization algorithm and the McKelvey frequency domain subspace algorithm. The methods were used in order to formulate a mathematical model that closely matches the frequency response function obtained from a vibration experiment conducted on an uncontrolled cantilever plate. Natural frequencies and damping ratios were determined using the system identification methods and the results are compared with a finite element analysis. A pulse response for a step input is simulated based on the state-space model system matrices obtained from the identification.
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