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Space Vehicle Experimental Modal Definition Using Transfer Function Techniques
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English
Abstract
In early 1975, a Hughes-built communications satellite was subjected to a ground vibration survey test to determine resonant frequencies, modes, and damping characteristics. Two different techniques were independently utilized to define the space vehicle vibration modal parameters. One consisted of the classical technique where multiple shakers were used to tune in a single resonance to define its frequency and normal mode shape. The second approach utilized recent technology and a data processing technique which provides for more complete data acquisition in a shorter actual on-the-floor test time. The latter method uses a single point random excitation to provide all the data required, which then undergoes a considerable amount of data processing. Transfer functions are computed for each accelerometer location from which the modal properties are assembled. The subject paper describes the two test techniques, data reduction, processing required, and a comparison of results.
Authors
Citation
Knauer, C., Peterson, A., and Rendahl, W., "Space Vehicle Experimental Modal Definition Using Transfer Function Techniques," SAE Technical Paper 751069, 1975, https://doi.org/10.4271/751069.Also In
References
- Richardson M. Potter R. “Identification of the Modal Properties of an Elastic Structure From Measured Transfer Function Data.” May 1974
- Hewlett Packard Company “Fourier Analyzer Training Manual.”
- Hewlett Packard Company “Modal Analysis Operating Manual (Temporary), Rev. D.” November 1974
- Budd R. W. “MODAPS - A Real Time Data Processing System for Modal Vibration Testing.” 17th Annual Meeting Institute of Environmental Sciences Los Angeles, CA 27 April 1971
- Hewlett Packard Company “Band-Selectable Fourier Analysis.” Operating/Software Note, Options 270, 271 or 272 for 5451B Fourier Analyzer System April 1974