Browsing AE Research Publications by Subject "Acoustic noise"
Now showing items 1-3 of 3
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Acoustic absorption properties of granular silica aerogels
(Institute of Noise Control Engineering, 2020-10-12)Aerogels are a class of synthetic materials derived using supercritical drying to extract the liquid component of a gel and replacing it with a gas. This process results in the formation of an ultra-lightweight nanoporous ... -
A comparison of the two and four microphone methods for deriving the characteristic acoustic properties of porous materials
(Institute of Noise Control Engineering, 2020-10-12)The characteristic acoustic impedance and wave number of a porous material can be derived using either a two microphone or a four microphone impedance tube setup. For the four microphone method, these complex properties ... -
Low-frequency noise control using layered granular aerogel and limp porous media
(Institute of Noise Control Engineering, 2021-08-01)The acoustic absorption of granular aerogel layers with a granule sizes in the range of 2 to 40 μm is dominated by narrow-banded, high absorption regions in the low-frequency range and by reduced absorption values at higher ...