HIGH FREQUENCY RESPONSE OF A RING-STIFFENED CYLINDER

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Authors
  1. Gilroy, L.E.
  2. Smith, M.J.
Corporate Authors
Defence Research Establishment Atlantic, Dartmouth NS (CAN)
Abstract
Power Flow Finite Element Analysis (PFFEA) has been under development at Defence Research Establishment Atlantic (DREA) in support of the Ship Noise Project. PFFEA is an analysis method for predicting high frequency structural acoustic and vibration response. The method is based on a vibrational conductivity approach in which the flow of vibrational energy is modelled in a similar fashion to heat conduction with convective losses. This report discusses experiments performed with DREA's 3m ring-stiffened cylinder to assist in the validation of the PFFEA software structure at relatively high frquencies using an electromagnetic/piezoelectric shaker located on either the cylinder shell or one of the ring-stiffeners. Both the input power and the response of the cylinder were measured with both harmonic and broadband excitation and the response of the cylinder were measured with both harmonic and broadband excitation using an accelerometer. The power flow predictions for either input mobility (harmonic case) or input power (broadband case) did not correlate well with the measured data. The measured applied forces were used as input to predict the response of the cylinder to both harmonic and broadband excitation. TRUNCATED
Keywords
Power Flow Finite Element Analysis (PFFEA);Stiffened cylinders;Power flow;Input power
Report Number
DREA-TM-98-221 — Technical Memorandum
Date of publication
01 Jan 1998
Number of Pages
43
DSTKIM No
99-00419
CANDIS No
510452
Format(s):
Hardcopy;Document Image stored on Optical Disk

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