Abstract
The sound transmission loss of homogenous isotropic panels is simply described theoretically from an infinite plate theory, in terms of the panel mass per unit area, bending stiffness per unit width and loss factor, and some a priori assumptions about the forcing sound field. In a typical transmission loss test, a number of additional factors are involved which may affect the test results. These effects include: (a) “diffusivity” of the incident sound field at the panel; (b) finite size of the test opening; (c) depth of the test opening; (d) inhomogenieties in the panel; (e) resonant response of the panel; (f) panel size compared with correlation length in the forcing sound field; (g) spectral shape of sound fields (when measured with filters of nonzero bandwidth). These variables are reviewed in view of the current state-of-the-art, and their range of effect in the region of the panel critical frequency is discussed.
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