Abstract
When developing noise-reducing structures for passenger, engine and luggage compartments of motor vehicles, an objective assessment of their sound-absorbing properties is important. The method of measuring the reverberation time of a diffuse sound has found the widest distribution. This method provides sufficient reliability and repeatability of measurement results. However, often the values of reverberation sound absorption coefficient are exceeded relative to the actual values. The article investigates the influence of side surfaces of sound-absorbing materials on equivalent sound absorption. The frequency range of effective absorption by side surfaces is indicated. An updated formula for approximate calculations is given.
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