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On the use of coherence functions to evaluate sources of dynamic excitationThe use of coherence functions for identifying the relative contributions of multiple dynamic inputs to the measured vibration response of spacecraft components on a practical, complex structure was investigated. Data were generated by applying simultaneous vibratory and acoustic excitation to a test model (a modified Titan instrumentation truss). Up to three inputs were used. In some cases mutually coherent inputs were generated. A digital computer program was written to analyze the test data, using an approach based on iterative computational algorithms. The results showed that the coherence function technique was effective in identifying and evaluating sources of excitation, for both independent and coherent inputs. The effect of varying the number of data samples used in the necessary averaging process was briefly investigated.
Document ID
19800007941
Acquisition Source
Legacy CDMS
Document Type
Conference Paper
Authors
Barrett, S.
(Martin Marietta Corp. Denver, CO, United States)
Date Acquired
August 10, 2013
Publication Date
September 1, 1979
Publication Information
Publication: Shock and Vibration Inform. Center The Shock and Vibration Bull., Pt. 1
Subject Category
Structural Mechanics
Accession Number
80N16201
Funding Number(s)
CONTRACT_GRANT: NAS1-14370
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.
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