SYSTEM AND METHOD FOR AUTOMATIC MODAL PARAMETER EXTRACTION IN STRUCTURAL DYNAMICS ANALYSIS
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United States of America Patent
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Jul 25, 2013
app pub date -
Jan 17, 2013
filing date -
Jan 23, 2012
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Abstract
A system and method for automatic modal parameter extraction in structural dynamics analysis are disclosed. In one embodiment, a stabilization diagram of a structure is obtained using a frequency domain parameter extraction technique. The stabilization diagram is a graph of measured transfer functions which include stable poles of the structure for each modal order versus frequencies which include modal frequencies of each stable pole. Further, a user is allowed to input user modal parameters, such as a maximum damping ratio, maximum number of stable poles to be selected from the stabilization diagram, and minimum separation in frequency between consecutive stable poles. Furthermore, stable poles having a damping ratio less than or equal to the maximum damping ratio are obtained. A histogram having bins, with a width equal to the minimum separation in frequency, is obtained. Also, the modal parameter of the structure is automatically extracted using the histogram.
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