Optimization of graded porous acoustic absorbers based on triply periodic minimal surfaces

The acoustic absorption of a porous structure within a specific frequency range can be tuned by varying its porosity along its thickness. In this work, triply periodic minimal surfaces (TPMS) are employed to generate graded porous structures, where the continuous porosity gradient is controlled by a...

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Published inMaterials & design Vol. 253; p. 113852
Main Authors Guan, Xueying, Deckers, Elke, Dong, Hao, Hornikx, Maarten, Yang, Jieun
Format Journal Article
LanguageEnglish
Published Elsevier Ltd 01.05.2025
Elsevier
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Online AccessGet full text
ISSN0264-1275
DOI10.1016/j.matdes.2025.113852

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Abstract The acoustic absorption of a porous structure within a specific frequency range can be tuned by varying its porosity along its thickness. In this work, triply periodic minimal surfaces (TPMS) are employed to generate graded porous structures, where the continuous porosity gradient is controlled by a mathematical function involving geometric parameters. A hybrid homogenization technique, combined with the transfer matrix method (TMM), is used to predict the normal incidence absorption coefficient of the graded TPMS structure. The porosity distribution along the thickness is then optimized using a global search method combined with a local gradient-based solver to maximize acoustic absorption within a target frequency range. The optimization results suggest that a combination of high- and low-porosity layers achieves broadband impedance matching conditions by shifting the so-called quarter-wavelength resonance frequencies. The design of the TPMS absorbers is validated through impedance tube measurements of 3D-printed samples. •Porosity grading in triply periodic minimal surface (TPMS) structures is optimized to improve broadband sound absorption.•Complex frequency plane analyses examine the effects of porosity, unit cell size, and thickness on sound absorption.•Power dissipation plots show that the redistribution of energy dissipation in graded absorbers enhances sound absorption at target frequencies.•Impedance tube measurements validate 3D-printed TPMS absorber designs.•The optimized TPMS absorbers' performance is compared with previously studied lattice-type sound absorbers.
AbstractList The acoustic absorption of a porous structure within a specific frequency range can be tuned by varying its porosity along its thickness. In this work, triply periodic minimal surfaces (TPMS) are employed to generate graded porous structures, where the continuous porosity gradient is controlled by a mathematical function involving geometric parameters. A hybrid homogenization technique, combined with the transfer matrix method (TMM), is used to predict the normal incidence absorption coefficient of the graded TPMS structure. The porosity distribution along the thickness is then optimized using a global search method combined with a local gradient-based solver to maximize acoustic absorption within a target frequency range. The optimization results suggest that a combination of high- and low-porosity layers achieves broadband impedance matching conditions by shifting the so-called quarter-wavelength resonance frequencies. The design of the TPMS absorbers is validated through impedance tube measurements of 3D-printed samples. •Porosity grading in triply periodic minimal surface (TPMS) structures is optimized to improve broadband sound absorption.•Complex frequency plane analyses examine the effects of porosity, unit cell size, and thickness on sound absorption.•Power dissipation plots show that the redistribution of energy dissipation in graded absorbers enhances sound absorption at target frequencies.•Impedance tube measurements validate 3D-printed TPMS absorber designs.•The optimized TPMS absorbers' performance is compared with previously studied lattice-type sound absorbers.
The acoustic absorption of a porous structure within a specific frequency range can be tuned by varying its porosity along its thickness. In this work, triply periodic minimal surfaces (TPMS) are employed to generate graded porous structures, where the continuous porosity gradient is controlled by a mathematical function involving geometric parameters. A hybrid homogenization technique, combined with the transfer matrix method (TMM), is used to predict the normal incidence absorption coefficient of the graded TPMS structure. The porosity distribution along the thickness is then optimized using a global search method combined with a local gradient-based solver to maximize acoustic absorption within a target frequency range. The optimization results suggest that a combination of high- and low-porosity layers achieves broadband impedance matching conditions by shifting the so-called quarter-wavelength resonance frequencies. The design of the TPMS absorbers is validated through impedance tube measurements of 3D-printed samples.
ArticleNumber 113852
Author Deckers, Elke
Dong, Hao
Yang, Jieun
Guan, Xueying
Hornikx, Maarten
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Keywords Homogenization
Sound absorption
Triply periodic minimal surface
Optimization
3D printing
Porosity grading
Language English
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Snippet The acoustic absorption of a porous structure within a specific frequency range can be tuned by varying its porosity along its thickness. In this work, triply...
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StartPage 113852
SubjectTerms 3D printing
Homogenization
Optimization
Porosity grading
Sound absorption
Triply periodic minimal surface
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Title Optimization of graded porous acoustic absorbers based on triply periodic minimal surfaces
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