Operating deflection shape
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Operating Deflection Shape (ODS), is a term often used in the structural vibration analysis, known as ODS analysis. ODS analysis is a method used for visualisation of the vibration pattern of a machine or structure as influenced by its own operating forces. This is as opposed to the study of the vibration pattern of a machine under an (known) external force analysis, which is called modal analysis.
www.hse.gov.uk/research/hsl_pdf/2006/hsl06104.pdf
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