MODEL DAMPING FACTORS FOR A RING-STIFFENED CYLINDER

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Authors
  1. Gilroy, L.E.
Corporate Authors
Defence Research Establishment Atlantic, Dartmouth NS (CAN)
Abstract
Defence Research Establishment Atlantic (DREA) conducted experiments involving the measurement of radiated noise from a ring-stiffened cylinder subjected to a harmonic load applied at the cylinder's resonant frequencies. Three sets of trials have been performed with the cylinder either floating, submerged, or in-air. These experiments were performed to provide validation data for structural acoustics computer codes being developed in-house and under contract. For the numerical analyses, it was necessary to use measured modal damping ratios to determine the radiated noise levels. This is seen as a deficiency in DREA's predictive capability in radiated noise. The report examined the measured damping ratios and attempted to draw general conclusions based on the data. It was determined that the lowest damping ratios were measured during the submerged tests followed by the in-air then floating tests; however, given the differences in experimental methods, it was not possible to isolate the mechanisms which determined the levels of damping.
Keywords
Harmonic loads;Damping ratios
Report Number
DREA-TM-97-237 — Technical Memorandum
Date of publication
01 May 1997
Number of Pages
19
DSTKIM No
97-03974
CANDIS No
504195
Format(s):
Hardcopy;Document Image stored on Optical Disk

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