Abstract
Cremer has shown that the damping factor of walls, the ratio of the imaginary to the real portion of their complex stiffness, is important in determining the sound transmission loss that a wall may afford above the frequency of coincidence of the trace of the acoustic wavelength upon the wall and the wavelength of the wall's flexural vibration. Measurements were made for several gypsum-board and steel-stud wall constructions. Many of these showed a constant value of the damping factor, but walls having fibrous insulation between studs or having a layer of wood fiberboard under the gypsum board showed an increased value of damping factor as the frequency was reduced below 4000 Hz. The measured value of damping factor was used to calculate the transmission loss and good agreement with measured TL was found.
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