Diffuse-field sound absorption characteristics of a spherical-microperforated space absorber

Sakagami, Kimihiro; Kusaka, Midori; Okuzono, Takeshi; Kido, Shigeyuki; Yamaguchi, Daichi

doi:10.1250/ast.41.784

Cited by 7 publications

(5 citation statements)

References 4 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…This type of absorber can be used to improve the acoustics of an enclosed space without changing the design of its surfaces – it can simply be placed on the floor or suspended from the ceiling. Previously, the main variants of 3D-MPAs were the cylindrical shape [cylindrical MPP space absorber (CMSA)] [ 6 ], the rectangular shape [rectangular MPP space absorber (RMSA)] [ 7 ] and the spherical shape [spherical MPP space absorber (SMSA)] [ 8 ]. The prototypes of these 3D-MPAs and their sound absorptivity are shown in Figs 4 and 5 .…”

Section: Space Sound Absorbers With Next-generation Materialsmentioning

confidence: 99%

See 1 more Smart Citation

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

Sakagami

Okuzono

2020

UCL Open Environ

Self Cite

View full text Add to dashboard Cite

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.

show abstract

Section: Space Sound Absorbers With Next-generation Materialsmentioning

confidence: 99%

“…Recently, we proposed three-dimensional microperforated space sound absorbers (3D-MPAs) of various types: cylindrical, rectangular and spherical [ 6 – 8 ]. A similar concept has also been applied to PMs, and we have proposed 3D PM space sound absorbers (3D-PMAs) [ 9 , 10 ].…”

Section: Introductionmentioning

confidence: 99%

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

Sakagami

Okuzono

2020

UCL Open Environ

Self Cite

View full text Add to dashboard Cite

show abstract

“…Recently, we proposed three-dimensional microperforated space sound absorbers (3D-MPAs) of various types: cylindrical, rectangular and spherical [6][7][8]. A similar concept has also been applied to permeable membranes, and we have proposed three-dimensional permeable membrane space sound absorbers (3D-PMAs).…”

Section: Alternative Sound Absorption Materials and Structures Suitable For Post-pandemic Applicationsmentioning

confidence: 99%

“…This type of absorber can be used to improve the acoustics of an enclosed space without changing the design of its surfaces-it can simply be placed on the floor or suspended from the ceiling. Previously, the main variants of 3D-MPAs were the cylindrical shape (cylindrical MPP space absorber (CMSA) [6], the rectangular shape (rectangular MPP space absorber (RMSA) [7] and the spherical shape (spherical MPP space absorber (SMSA) [8]. The prototypes of these 3D-MPAs and their sound absorptivity are shown in Figures 4 and 5.…”

Section: Space Sound Absorbers With Microperforated Panels (Mpps)mentioning

confidence: 99%

Space sound absorbers with next-generation materials: additional sound absorption for post-pandemic challenges in indoor acoustic environments

Sakagami

Okuzono

2020

Preprint

Self Cite

View full text Add to dashboard Cite

In this study, we first point out the possible acoustic problems associated with the post-pandemic operation of built environments. Particularly, 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 space sound absorbers developed through our recent research projects. Significantly, the type of sound absorber propose 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 three-dimensional MPP or PM space absorbers possess the additional value of aesthetic designability.

show abstract

“…MPP's optical qualities offer esthetic value and an appealing indoor look because it is created from solid panels. 7 The widespread use of micro-perforated panels in low-frequency noise suppression is threatened by expensive manufacturing technology, hence there is a need to create more cost-effective and efficient ways to manufacture MPPs.…”

Section: Introductionmentioning

confidence: 99%

Extremely effective broadband low-frequency sound absorption with inhomogeneous micro-perforated panel (iMPP) backed with spider-web designed cavities

Rafique

Naqvi

et al. 2022

Proceedings of the Institution of Mechanical Engineers, Part L:

View full text Add to dashboard Cite

Low-frequency wideband noise reduction has posed a significant problem to the scientific and technical communities in recent years. A single layer of a parallel-arranged inhomogeneous micro-perforated panel (iMPP) coupled with spider-web designed cavities is offered as a composite acoustic structure in this paper. Three different spider-web shapes have been designed and studied, i.e. circular, octagonal, and square. By controlling the different inhomogeneous patterns, perforation ratio, the thickness of iMPP, and back cavity depths, a broader multipeak low-frequency sound-absorbing performance equivalent to different resonant frequencies can be achieved. To anticipate the sound absorption coefficient of the new design, both theoretical analysis and finite-element method (FEM) simulation are executed. The predicted and FEM simulation sound absorption results of the new composite structure are verified in the experimental investigation using a square-designed sound impedance tube. By a subwavelength thickness of just 100 mm, a highly effective low-frequency broadband sound-absorbing composite structure is successfully attained by integrating many inhomogeneous MPP unit cells supported with spider-web-designed cavities. The average sound absorption coefficient is over 90% ( α = 0.94) within the bandgap of 230 Hz to 470 Hz. Compared to traditional sound-absorbing materials, the composite structure comprises inhomogeneous MPP coupled with spider-web-designed cavities, which may provide good absorption performance while maintaining a modest and robust construction for active low-frequency noise suppression.

show abstract

Diffuse-field sound absorption characteristics of a spherical-microperforated space absorber

Cited by 7 publications

References 4 publications

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

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

Space sound absorbers with next-generation materials: additional sound absorption for post-pandemic challenges in indoor acoustic environments

Extremely effective broadband low-frequency sound absorption with inhomogeneous micro-perforated panel (iMPP) backed with spider-web designed cavities

Contact Info

Product

Resources

About