The results of an experimental study of sound-insulating properties of fibrous materials have been provided. A simplified methodology to measure the air noise insulation of fibrous materials has been proposed. An installation to implement the methodology includes a small-size chamber sound-insulated from the environment, a sound generator, and a sound level meter. Dependencies of air noise insulation with fibrous materials on sound frequency, density, and thickness of a sound-insulating material have been obtained. The calculation of the air noise insulation index by experimentally obtained frequency responses for the material samples based on the optical fiber SHUMKA and a superthin basalt fiber of the same sizes and density has demonstrated better results for the latter. The uncertainty of obtained frequency response has been established: when the sound frequency increases from 63 to 125 Hz, the air noise insulation increases; when the sound frequency increases from 125 to 500 Hz, the air noise insulation drops; from the sound frequency of 500 Hz and higher, the sound insulation of air noise only increases. The air noise insulation for each of the examined samples at the low sound frequency from 63 to 500 Hz has no significant differences. In the future, it is planned to determine potential differences between the measurement results obtained by the proposed methodology from the results obtained by the standard methodology. The proposed methodology can be used to compare the sound-insulating properties of various fibrous materials before their selection in order to resolve real engineering problems of human protection from production noise.
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