Synonyms
Ambient modal identification; Bayes’ theorem; Modal identification; Operational modal analysis; Signal-to-noise ratio; System identification; Uncertainty law
Introduction
Operational modal analysis, or ambient modal identification, aims at identifying the modal properties (natural frequency, damping ratio, mode shape, etc.) of an instrumented structure using only the (output) vibration response (acceleration, velocity, etc.). The input excitation to the structure is not measured but is assumed to be broadband random, often referred to as “ambient.” This allows vibration data to be collected when the structure is in its working or “operating” condition without much intervention, therefore implying significant economy over free-vibration (initially excited but no input afterwards) or forced-vibration tests (known input). The broadband random assumption essentially requires that the spectral characteristics (shape) of the measured response reflect the properties of the modes...
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Au, SK. (2015). Bayesian Operational Modal Analysis. In: Beer, M., Kougioumtzoglou, I.A., Patelli, E., Au, SK. (eds) Encyclopedia of Earthquake Engineering. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-642-35344-4_233
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DOI: https://doi.org/10.1007/978-3-642-35344-4_233
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