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Zielinski T.G., Dauchez N.♦, Boutin T.♦, Leturia M.♦, Wilkinson A.♦, Chevillotte F.♦, Bécot F.-X.♦, Venegas R.♦, Taking advantage of a 3D printing imperfection in the development of sound-absorbing materials,
APPLIED ACOUSTICS, ISSN: 0003-682X, DOI: 10.1016/j.apacoust.2022.108941, Vol.197, pp.108941-1-22, 2022 Abstract: At first glance, it seems that modern, inexpensive additive manufacturing (AM) technologies can be used to produce innovative, efficient acoustic materials with tailored pore morphology. However, on closer inspection, it becomes rather obvious that for now this is only possible for specific solutions, such as relatively thin, but narrow-band sound absorbers. This is mainly due to the relatively poor resolutions available in low-cost AM technologies and devices, which prevents the 3D-printing of pore networks with characteristic dimensions comparable to those found in conventional broadband sound-absorbing materials. Other drawbacks relate to a number of imperfections associated with AM technologies, including porosity or rather microporosity inherent in some of them. This paper shows how the limitations mentioned above can be alleviated by 3D-printing double-porosity structures, where the main pore network can be designed and optimised, while the properties of the intentionally microporous skeleton provide the desired permeability contrast, leading to additional broadband sound energy dissipation due to pressure diffusion. The beneficial effect of additively manufactured double porosity and the phenomena associated with it are rigorously demonstrated and validated in this work, both experimentally and through precise multi-scale modelling, on a comprehensive example that can serve as benchmark. Keywords: double porosity, additive manufacturing, sound absorption, pressure diffusion, multi-scale modelling Affiliations:
Zielinski T.G. | - | IPPT PAN | Dauchez N. | - | Sorbonne University Alliance (FR) | Boutin T. | - | Sorbonne University Alliance (FR) | Leturia M. | - | Sorbonne University Alliance (FR) | Wilkinson A. | - | Sorbonne University Alliance (FR) | Chevillotte F. | - | MATELYS – Research Lab (FR) | Bécot F.-X. | - | MATELYS – Research Lab (FR) | Venegas R. | - | MATELYS – Research Lab (FR) |
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Zieliński T.G., Opiela K.C., Pawłowski P., Dauchez N.♦, Boutin T.♦, Kennedy J.♦, Trimble D.♦, Rice H.♦, Van Damme B.♦, Hannema G.♦, Wróbel R.♦, Kim S.♦, Ghaffari Mosanenzadeh S.♦, Fang N.X.♦, Yang J.♦, Briere de La Hosseraye B.♦, Hornikx M.C.J.♦, Salze E.♦, Galland M.-A.♦, Boonen R.♦, Carvalho de Sousa A.♦, Deckers E.♦, Gaborit M.♦, Groby J.-P.♦, Reproducibility of sound-absorbing periodic porous materials using additive manufacturing technologies: round robin study,
Additive Manufacturing, ISSN: 2214-8604, DOI: 10.1016/j.addma.2020.101564, Vol.36, pp.101564-1-24, 2020 Abstract: The purpose of this work is to check if additive manufacturing technologies are suitable for reproducing porous samples designed for sound absorption. The work is an inter-laboratory test, in which the production of samples and their acoustic measurements are carried out independently by different laboratories, sharing only the same geometry codes describing agreed periodic cellular designs. Different additive manufacturing technologies and equipment are used to make samples. Although most of the results obtained from measurements performed on samples with the same cellular design are very close, it is shown that some discrepancies are due to shape and surface imperfections, or microporosity, induced by the manufacturing process. The proposed periodic cellular designs can be easily reproduced and are suitable for further benchmarking of additive manufacturing techniques for rapid prototyping of acoustic materials and metamaterials. Keywords: porous materials, designed periodicity, additive manufacturing, sound absorption Affiliations:
Zieliński T.G. | - | IPPT PAN | Opiela K.C. | - | IPPT PAN | Pawłowski P. | - | IPPT PAN | Dauchez N. | - | Sorbonne University Alliance (FR) | Boutin T. | - | Sorbonne University Alliance (FR) | Kennedy J. | - | Trinity College (IE) | Trimble D. | - | Trinity College (IE) | Rice H. | - | Trinity College (IE) | Van Damme B. | - | other affiliation | Hannema G. | - | other affiliation | Wróbel R. | - | other affiliation | Kim S. | - | other affiliation | Ghaffari Mosanenzadeh S. | - | other affiliation | Fang N.X. | - | other affiliation | Yang J. | - | Clemson University (US) | Briere de La Hosseraye B. | - | other affiliation | Hornikx M.C.J. | - | other affiliation | Salze E. | - | other affiliation | Galland M.-A. | - | École Centrale de Lyon (FR) | Boonen R. | - | other affiliation | Carvalho de Sousa A. | - | other affiliation | Deckers E. | - | Katholieke Universiteit Leuven (BE) | Gaborit M. | - | other affiliation | Groby J.-P. | - | other affiliation |
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