Evaluation and Improvement of Acoustic Interlayers for Laminated Glass by the Meanof Double Glazing

Numerical methods are used in order to predict
the Sound Transmission Loss of a double glazing
including a laminated pane. The results of this
prediction are used to evaluate the performances
of the interlayer, or to specify to the maker of the
interlayer the required viscoelastic properties of
his product.
The viscoelastic characteristics of the interlayer
are discussed on the basis of the equations of the
master curves (shear modulus and loss factor),
and the shifting coefficients, based on the WLF
theory.
The modelisation of the double glazing is made
by a method analysing the boundary conditions,
and the interaction between the air space and the
glass sheets.
Final measurements of the Sound Transmission
Loss of double glazings are made with different
types of interlayers with the same glass
combinations, and the predicted tendencies are
confirmed, as well as the ranking of the interlayers.

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The Authors

Mr. Marc Rehfeld Acoustics expert Compagnie de Saint Gobain Saint Gobain Glass CRDC Marc Rehfeld is responsible of the Acoustics/Numerical Modelling Team at the "Centre de Développement Industriel" (CDI), working both for Saint Gobain Glass and Saint Gobain Sekurit. He has over 25 ye... Read more