 
Summary: A linear leastsquares 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 303320405
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 multidegreeoffreedom
model equations is discussed.
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