Modal Analysis Using the Singular Value Decomposition and Rational Fraction Polynomials
Abstract
This report documents the computer codes developed at the Penn State Applied Research Laboratory to extract modal information from experimental vibration measurements. It includes discussions of the numerical techniques used in the analysis, formats for the input files, output from the computer codes, and interpretation of the results. The programs are designed for experimental data sets with multiple drive and response points and have proven effective even for systems with numerous closely-spaced resonance frequencies and relatively high noise levels. For the final stage of the analysis, a graphical interface has been developed to simplify the process of eliminating misidentified modes and refining the predictions for the resonance frequencies, loss factors, and mode shapes. An example problem of a pipe with a bend is used to illustrate the required input and the expected results. Measurements of multiple input-multiple output data for experimental modal analysis can also be useful for computing quantities relevant to statistical energy analysis, and thus calculations for power injection and radiation loss factors are also documented.
Document Details
- Document Type
- Technical Report
- Publication Date
- Apr 06, 2017
- Accession Number
- AD1035206
Entities
People
- J. B. Fahnline
- M. R. Shepherd
- R. L. Campbell
- S. A. Hambric