Abstract
Sound-absorbing materials are usually measured in a reverberation chamber (diffuse field condition) or in an impedance tube (normal sound incidence). In this paper, we show how angle-dependent absorption coefficients could be measured in a factory-type setting. The results confirm that the materials have different attenuation behavior to sound waves coming from different directions. Furthermore, the results are in good agreement with sound absorption coefficients measured for comparison in a reverberation room and in an impedance tube. In addition, we introduce a biofiber-based material that has similar sound absorption characteristics to glass-wool. The angle-dependent absorption coefficients are important information in material development and in room acoustics modeling.
Highlights
Distinctive modern architecture from schools and offices to private houses is currently dominated by large open spaces, such as open-plan offices and multi-functional learning spaces
The sound absorption mechanisms in porous materials may differ according to their porous structure, which is determined by the manufacturing process and by the raw materials used in their production
It is noted that data from the receiver at 10◦ have been excluded from the polar responses and angle-dependent sound absorption calculations due to difficulties in the separation of the direct sound and spurious reflections from the first reflection from the panel under test
Summary
Distinctive modern architecture from schools and offices to private houses is currently dominated by large open spaces, such as open-plan offices and multi-functional learning spaces. Such spaces set very high acoustical requirements for the surface materials in order to make the spaces suitable for their functions. Of especial interest is the increasing development of bio-acoustic materials [7] that have equal or even superior acoustic properties to the conventional materials, but that contribute to mitigating climate change by reducing CO2 emissions, and even, in the case of wood-based building materials, binding CO2 into their structures for their operating life. By replacing 1 % of the worlds porous acoustic panel market (approx. 220 billion m2/year in 2017) with a biofiber-based solution, over 3000 tons of CO2 could be bound to buildings, which roughly equals the emissions from travelling by airplane for over 20 million kilometers [8]
Sign-in/Register to view highlights & summary 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.
