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Eigensystem realization algorithm user's guide forVAX/VMS computers: Version 931216The eigensystem realization algorithm (ERA) is a multiple-input, multiple-output, time domain technique for structural modal identification and minimum-order system realization. Modal identification is the process of calculating structural eigenvalues and eigenvectors (natural vibration frequencies, damping, mode shapes, and modal masses) from experimental data. System realization is the process of constructing state-space dynamic models for modern control design. This user's guide documents VAX/VMS-based FORTRAN software developed by the author since 1984 in conjunction with many applications. It consists of a main ERA program and 66 pre- and post-processors. The software provides complete modal identification capabilities and most system realization capabilities.
Document ID
19940032311
Acquisition Source
Legacy CDMS
Document Type
Technical Memorandum (TM)
Authors
Pappa, Richard S. (NASA Langley Research Center Hampton, VA, United States)
Date Acquired
September 6, 2013
Publication Date
May 1, 1994
Subject Category
Computer Programming And Software
Report/Patent Number
NASA-TM-109066
NAS 1.15:109066
Accession Number
94N36818
Funding Number(s)
PROJECT: RTOP 233-01-01-12
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.

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