Some considerations on the use of space sound absorbers with next-generation materials reflecting COVID situations in Japan: additional sound absorption for post-pandemic challenges in indoor acoustic environments

Abstract

In this study, we first point out the possible acoustic problems associated with the post-pandemic operation of built environments. In particular, we focus on the problem of acoustic deficiency due to the lack of absorption. This deficiency, which is likely to be encountered in most enclosed spaces in a range of establishments, is due to the reduced number of audience members or users of the space as a result of social distancing. As one of the promising solutions to this problem, we introduce a sound absorption technique using three-dimensional (3D) space sound absorbers developed through our recent research projects. Significantly, the type of sound absorber proposed herein is made of materials that are especially suited to hygiene considerations. The materials are microperforated panels (MPPs) and permeable membranes (PMs), both of which are easily washable and sanitised. Furthermore, we point out that 3D-MPP or PM space absorbers possess the additional value of aesthetic designability.

Application of transparent microperforated panel to acrylic partitions for desktop use: A case study by prototyping

“…With regard to the MPP sound-absorbing structure applicable to partitions, the authors previously proposed a double-leaf MPP space sound absorber (DLMPP) [9,10], which consists of two MPPs arranged in parallel with an air layer in between, whereby the structure as a whole is permeable. As mentioned above, when considering desktop partitions for preventing droplet infection, it is desirable to use an unperforated plate in combination with MPPs to create an impermeable structure as a whole; thus, a triple-leaf structure with two MPPs and an unperforated plate in between is more suitable.…”

“…Since then, many studies on its development and utilisation have been carried out, and manufacturing methods have also been developed [5,6], leading to various products (including transparent ones) in recent years [7,8]. We have also proposed the use of MPP as a spatial sound absorber [9,10]. MPP is a perforated plate made of any material with a thickness of less than 1 mm and a diameter of less than 1 mm with a hole opening ratio of less than 1%, which are much smaller dimensions than traditionally used conventional perforated panels with larger holes, thicknesses, and perforation ratios.…”

“…As mentioned above, it is not difficult to make transparent panels. We have actually used transparent samples in their experiments (e.g., [9,10]). Another example can be seen in Kang and Brocklesby [11], where they proposed an acoustic window using a transparent silencer with transparent MPPs.…”

Application of transparent microperforated panel to acrylic partitions for desktop use: A case study by prototyping

“…Since then, many studies on its development and utilisation have been carried out, and manufacturing methods have also been developed [4,5], leading to various products (including transparent ones) in recent years [6]. We have also proposed the use of MPP as a spatial sound absorber [7,8]. MPP is a perforated plate made of any material with a thickness of less than 1 mm and a diameter of less than 1 mm with a hole opening ratio of less than 1%, which are much smaller dimensions than traditionally used conventional perforated panels with larger holes, thicknesses, and perforation ratios.…”

“…As mentioned above, it is not difficult to make transparent panels. We have actually used transparent samples in their experiments (e.g., [7,8]). Another example can be seen in Kang and Brocklesby [9], where they proposed an acoustic window using a transparent silencer with transparent MPPs.…”