VIBRO Software Experimental Validation


  1. Berry, A.
  2. Wojtowicki, J-L.
  3. Berry, S.
  4. Panneton, R.
Corporate Authors
Defence Research Establishment Atlantic, Dartmouth NS (CAN);Sherbrooke Univ, Sherbrooke QUE (CAN) Dept of Mechanical Engineering
The University of Sherbrooke's Acoustics and Vibration Group (GAUS) have developed a computer code called VIBRO for modeling the effect of damping and decoupling coatings on the sound radiation from fluid loaded plates. In this work, laser vibrometry was used to measure the vibration on the both the wet and dry sides of plates backed by a water filled cavity. VIBRO accurately predicted the mean square velocity spectra of bare 2 mm steel plates in air, both in terms of peak positions and magnitudes. The agreement between experimental data and VIBRO model predictions was not quite as good for the corresponding experiments of the bare plate in water, but peak positions still matched closely. A modified Oberst beam method was used to determine the complex Young's and shear modulus of four different types of foam materials: 3 mm neoprene, 6 mm ethylvinylacetate, 12 mm ethylvinylacetate, and 25 mm EPT/SBR foam. For plates coated with these foams, the VIBRO model predictions were generally very good on the water side of the plate. However, the VIBRO model calculations did not capture a dip in the mean square velocity spectrum that was observed on the air side of coated plates. The results suggest that VIBRO is a useful tool for prediction of the vibration insertion loss and acoustic insertion loss as vibroacoustic indicators. The experimental results related to the effect of the decoupling coatings on the vibration at the plate/air interface could not be explained in terms of the VI

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Vibro-acoustics;Computer programs (VIBRO)
Report Number
DREA-CR-2001-054;SHER/UNIV-2000-R28B — Contractor Report
Date of publication
01 Jul 2002
Number of Pages

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