Copy the page URI to the clipboard
Opiela, K. C.; Zielinski, T. and Attenborough, K.
(2022).
DOI: https://doi.org/10.1016/j.matdes.2022.110703
Abstract
The potential usefulness of relatively simple pore microstructures such as parallel, identical, inclined slits for creating broadband sound absorption has been argued through analytical models. In principle, such microstructures could be realised through budget additive manufacturing. However, validation of the analytical predictions through normal incidence impedance tube measurements on finite layers is made difficult by the finite size of the tube. The tube walls curtail the lengths of inclined slits and, as a result, prevent penetration of sound through the layer. As well as demonstrating and modelling this effect, this paper explores two manufacturing solutions. While analytical and numerical predictions correspond well to absorption spectra measured on slits normal to the surface, discrepancies between measured and predicted sound absorption are noticed for perforated and zigzag slit configurations. For perforated microgeometries this is found to be the case with both numerical and analytical modelling based on variable length dead-end pores. Discrepancies are to be expected since the dead-end pore model does not allow for narrow pores in which viscous effects are important. For zigzag slits it is found possible to modify the permeability used in the inclined slit analytical model empirically to obtain reasonable agreement with data.
Viewing alternatives
Download history
Metrics
Public Attention
Altmetrics from AltmetricNumber of Citations
Citations from DimensionsItem Actions
Export
About
- Item ORO ID
- 83040
- Item Type
- Journal Item
- ISSN
- 0264-1275
- Project Funding Details
-
Funded Project Name Project ID Funding Body Impact of the 3D printing process on the 461 acoustic properties of porous materials 2020/37/N/ST8/04071: National Science Centre (NCN), Poland - Keywords
- slitted sound absorber; additive manufacturing; microstructure-based modelling
- Academic Unit or School
- Faculty of Science, Technology, Engineering and Mathematics (STEM)
- Copyright Holders
- © 2022 The Authors
- Depositing User
- Keith Attenborough