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Modal Acceptability and Purity Ratio
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Sector:
Event:
Aerospace Meeting
Language:
English
Abstract
Modal testing has become very popular today for dynamic structural definition and problem resolution of a multitude of dynamic problems. A criterion of purity is presented which is applicable to all modal data regardless of the method of excitation. The modal acceptability and purity ratio allows a one-number linear ratio that describes a percentage deviation from zero, where zero is defined as a pure, natural mode. This ratio was used on the Space Shuttle modal program to provide instant visibility of modal data quality as well as a real-time guide to potential problems associated with certain modes.
Authors
Topic
Citation
Selmer, L., "Modal Acceptability and Purity Ratio," SAE Technical Paper 781046, 1978, https://doi.org/10.4271/781046.Also In
References
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- Randall R.L. “Coherence Measurements” Rockwell International Internal Document 1964
- Selmer L. Sesto L. Rusch F. “Evolution of Shuttle Modal Test Techniques” Proceeding of the Fourth Aerospace Testing Conference 1978