Correlation of a Coarse-mesh Finite Element Model Using Structural System Identification and a Frequency Response Assurance Criterion
نویسنده
چکیده
A coarse-mesh finite element model of an engine cradle structure is experimentally correlated using the structural system identification technique. The coarsemesh model represents the cradle structure with beam and spring elements. The structural system identifcation code SSID is used to update the structural properties to correlate the model with measured natural frequency and modeshape data. A Frequency Response Assurance Criterion (FRAC) is developed to provide a measure of the correlation between the predicted and measured frequency response functions. The updated coarse-mesh model is shown to predict the lower frequency vibration response nearly as accurately as a fine-mesh plate model of the structure.
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