Abstract
A sound transmission facility has been constructed at M.I.T. This facility has a test opening of 9×14 ft. The source and receiver rooms are identical with dimensions of 15×19.4×12 ft. Room reverberation times and background noise levels are reported. The experimental transmission loss (TL) of a 12 in. plasterboard wall without studs compares well with its theoretical transmission loss, thereby verifying that the facility is operating properly for low TL walls. Experimental studies show the effect of varying the ratio of stud impedances to panel impedance by adjusting the lineal weight and moment of inertia of the studs. As the effective perimeter is increased by adding studs of sufficiently high impedance, a situation is reached where the sound transmission by resonant modes below the critical frequency exceeds the transmission due to mass controlled motion alone. The implication of these results on the design of stud reinforced walls is discussed.
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