Abstract
Experimental results on the acoustic properties of silica aerogel granules of sizes 80 μm and 3.5 mm are presented. An acoustic absorber made of a two-layer granular aerogel structure, an impedance matching layer and an absorbing one, has been designed. The reflection coefficient, the attenuation, and the sound velocity of the granular aerogels have been measured as a function of frequency (between 20 and 2500 Hz) and compared with those of a glass wool sample. It has been found that the acoustic transmission losses in the aerogel absorber are at least 10 dB higher than in the glass wool sample of the same thickness (4 cm) for the frequency range 300–1700 Hz.
Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
