Abstract
Interior noise studies in airplanes have identified floors as one of the primary noise paths. The acoustic barrier properties of floor panels are typically quantified by sound transmission loss (STL) measurements. A subscale transmission loss suite consisting of a reverberant room and an anechoic room was constructed and qualified to study the relative transmission loss trends of orthotropic sandwich panels used in airplane floors. A host of material combinations accounting for a variety of mechanical properties were tested for their acoustic performance. The transmission loss measurements were based on a sound intensity technique (ASTM E 2249-02) and a sound pressure technique (SAE J 1400-90). The results from these two techniques were compared to results from a full-scale accredited facility using the two-reverberation room method (ASTM E 90-02). The STL trends for orthotropic sandwich panels from the sub-scale facility were comparable to trends from the full-scale facility between 315 and 5000 Hz. The measurements permitted a ranking of several standard floor panels with respect to acoustic performance. [Support for this research from Mervyn C. Gill Foundation is gratefully acknowledged.]
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