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Summary: A linear least-squares version of the algorithm of mode isolation
for identifying modal properties. Part I: Conceptual development
Jerry H. Ginsberg and Matt Allen
G. W. Woodruff School of Mechanical Engineering
Georgia Institute of Technology
Atlanta, GA 30332-0405
October 27, 2003
PACS numbers: 43.40.At, 43.40.Le, 43.40.Yq
Running title: Algorithm of mode isolation. I: Concept
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ABSTRACT
The Algorithm of Mode Isolation (AMI) is an iterative procedure for identifying the
number of modes contributing to a frequency response function (FRF) concurrently with
identifying the complex eigenvalues and eigenvectors of those modes. The latest modifica-
tions obtain these modal properties solely by using linear least squares fits of the FRF data
to canonical forms. The algorithmic operations are explained in a detailed sequence of steps
that are illustrated by some sample data. The computational efficiency of AMI relative
to other modal identification algorithms that fit response data to multi-degree-of-freedom
model equations is discussed.
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