A new approach to the design of sound-absorbing materials was experimentally investigated. Improved acoustic properties were obtained in a wider frequency range through the impregnation of nanoporous grit into foam pores. Using this approach, the range of efficiency of these materials was extended from high frequencies of 2.0–6.3 kHz to a lower band of 0.5–1.6 kHz. The absorption ratio was increased by 60–100%, and the transmission loss was increased by 20–22 dB.
Applied Acoustics – Elsevier
Published: Oct 1, 2018
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