Acoustical Materials for Use in Monumental Spaces

Farrell, W. R.

doi:10.1121/1.2369298

Cited by 4 publications

(1 citation statement)

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“…In addition to previously presented parameters, in the acoustics technical literature another indicator is typically used, which is related to noise insulation capability, particularly for middle-range frequencies. This is known as the Noise reduction coefficient (abbreviated NRC; introduced by W. R. Farrell in the early 1950s [ 68 ]), and this is represented by a single number, ranging from 0.0 to 1.0, which describes the average sound absorption performance of a material. NRC is the arithmetic average, rounded to the nearest multiple of 0.05, of the sound absorption coefficients for a specific material and mounting condition, evaluated at the octave band centre frequencies of 250, 500, 1000, and 2000 Hz.…”

Section: Resultsmentioning

confidence: 99%

Cellulose Fibers-Based Porous Lightweight Foams for Noise Insulation

Seciureanu,

Nastac,

Guiman

et al. 2023

Polymers

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This paper examines effective and environmentally friendly materials intended for noise insulation and soundproofing applications, starting with materials that have gained significant attention within last years. Foam-formed materials based on cellulose fibers have emerged as a promising solution. The aim of this study was to obtain a set of foam-formed, porous, lightweight materials based on cellulose fibers from a resinous slurry pulp source, and to investigate the impact of surfactant percentage of the foam mixtures on their noise insulation characterisitcs. The basic foam-forming technique was used for sample assembly, with three percentages of sodium dodecyl sulphate (as anionic surfactant) related to fiber weight, and a standardised sound transmission loss tube procedure was used to evaluate noise insulation performance. Results were obtained as observations of internal structural configurations and material characteristics, and as measurements of sound absorption/reflection, sound transmission loss, and surface acoustic impedance. Based on the findings within this study, the conclusions highlight the strong potential of these cellulosic foams to replace widely used synthetic materials, at least into the area of practical noise insulation applications.

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Section: Resultsmentioning

confidence: 99%