What is it about?
A new method, namely Impact-Synchronous Modal Analysis (ISMA) utilising the modal extraction techniques commonly used in EMA but performed in the presence of the ambient forces, is proposed.
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Why is it important?
The coherence functions are commonly used to measure the acceptability of the estimations. Impact-Synchronous Time Averaging is compared against Spectral Averaging while performing Modal Analysis in a situation containing ambient and operating forces. Results showed that while the transfer functions obtained from both the averaging techniques were of similar quality, the Impact-Synchronous Time Averaging indicated better coherence than the Spectral Averaging.
Perspectives
ISMA is a new interesting approach for modal extraction.
Professor Zubaidah Ismail
University of Malaya
Read the Original
This page is a summary of: Enhancement of coherence functions using time signals in Modal Analysis, Measurement, December 2011, Elsevier,
DOI: 10.1016/j.measurement.2011.08.003.
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