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A linear least-squares version of the algorithm of mode isolation for identifying modal properties. Part II: Application and Assessment
 

Summary: A linear least-squares version of the algorithm of mode isolation for identifying
modal properties. Part II: Application and Assessment
Matt Allen and Jerry H. Ginsberg
G. W. Woodruff School of Mechanical Engineering
Georgia Institute of Technology
Atlanta, GA 30332-0405
October 28, 2003
PACS numbers: 43.40.Le, 43.40.Cw, 43.40.Yq
Running title: Algorithm of mode isolation. II: Assessment
1
ABSTRACT
The latest modifications of the Algorithm of Mode Isolation (AMI) for identification of
modal properties from frequency response data are tested with synthetic data derived from an
analytical model of an elastic frame in which flexure and torsion are coupled. The parameters
of this model are selected to cause the occurrence of localized modal patterns in two modes
having close natural frequencies. The response data is contaminated with white noise at
a level sufficient to almost mask the two close modes. Results for the real and imaginary
part of the eigenvalues are tabulated. The analytical modal patterns of displacement and
torsional rotation are depicted graphically, accompanied by the discrete values obtained from
AMI. Excellent agreement is found to occur for each mode, other than one of the pair of close

  

Source: Allen, Matthew S. - Department of Engineering Physics, University of Wisconsin at Madison

 

Collections: Engineering