An ambient vibration survey was performed on the first Titan IV/Inertial Upper Stage (IUS) launch vehicle at Cape Canaveral Air Force Station for purposes of modal frequency and shape identification, and parameter estimation. Clearly identified were 14 vibration modes of the coupled vehicle/stand system up to 10 Hz. Processed data included power spectral density (PSD) functions, frequency response functions (FRF) and coherence functions. Data quality is excellent based on the smoothness of the spectral functions and the high coherence values associated with the various resonant peaks. Agreement within 9 percent for frequency was observed in 12 of the 14 responses when compared with results from an analytical model. Differences are attributed to modeling discrepancies at the launch stand-vehicle interface with respect to the test configuration.
Ambient vibration survey of a Titan launch vehicle
Aufnahme der Umgebungsvibration eines Titan Abschußvehikels
1994
7 Seiten, 7 Bilder, 1 Tabelle, 7 Quellen
Conference paper
English
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