Abstract

The insulation of noise by folded panel partitions made of several layers of nonwoven fiberwebs and a layer of woven fabric was examined. The resulting transmission loss of the composite structure was an oscillatory function of the opening angle between the individual panels and an increasing function of the number of fiberweb layers that comprise the partition. For most frequencies, the angle which yields the highest transmission loss was about 70°. The effect of the woven fabric on the transmission loss was most significant at small opening angles—about 10°—where values up to 20 dB were observed.

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