THE FORCED RESPONSE AND DAMPING CHARACTERISTICS OF A CANTILEVER BEAM WITH A THICK DAMPING LAYER

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Authors
  1. Stredulinsky, D.C.
  2. Szabo, J.P.
Corporate Authors
Defence Research Establishment Atlantic, Dartmouth NS (CAN)
Abstract
This document describes the vibration analysis of a steel cantilever beam 649 mm long, 204 mm wide and 9.5 mm thick with a free viscoelastic damping layer (27 mm thick EAR Isodamp C-1002) bonded to one surface. Predictions of composite loss factor and response were made at forcing frequencies between 10 Hz and 3000 Hz using a direct frequency response capability recently developed for the DREA in-house finite element code VAST. Analytical results were also obtained with the PREDC code acquired from the University of Dayton, Ohio. The frequency dependent dynamic mechanical material properties, used in VAST and PREDC were measured at DREA using a forced vibration Non-resonant method. The VAST forced response vibration analysis was in good agreement with experiment. Above 500 Hz, the system composite loss factors and those predicted with the PREDC code were significantly below the measured loss factors and those predicted by the VAST code. This is attributed to the more complicated deformation of the damping layer predicted by the finite element model, but not accounted for by the Euler-Bernoulli beam formulation used in the PREDC code.
Report Number
DREA-TM-95-229 — Technical Memorandum
Date of publication
01 Dec 1995
Number of Pages
35
DSTKIM No
96-02667
CANDIS No
435279
Format(s):
Document Image stored on Optical Disk;Hardcopy

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