This paper investigates the characteristics of analytical models in prediction of sound transmission loss (STL) for double panels filled with heavy mineral wool. Two theoretical models, i.e., the poro-elastic and sandwich models, are applied to predict the insulation performance of such double panels. Comparisons between predictions and measurements reveal that for such panels, the sandwich model is more efficient to account for the insulation property than the poro-elastic model. It is also found that when mineral wool is installed in such a manner that fibers are vertically erected with respect to the panel skin direction, the mass-spring-mass resonance frequency occurs at much higher frequency, compared to the case of horizontal fiber direction. Consequently, the vertical fiber case yields much higher values of STC (Sound Transmission Class) than the horizontal fiber case, without changing the weight of the panel.
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