Sound absorption of macro-perforated additively manufactured media

Carbajo, J.; Molina-Jordá, J.M.; Maiorano, L.P.; Fang, Nicholas X.

doi:10.1016/j.apacoust.2021.108204

Cited by 14 publications

(3 citation statements)

References 30 publications

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“…Carbajo et al [27] obtained 3D-printed macro-perforated porous polylactic acid filament (PLA) materials using fused deposition modeling (FDM) with a simple filling pattern that provided open porosities ranging from 8% to 39% with pore sizes of at least 0.2 mm. The experimental results showed a high absorption performance for the samples that exhibited macro-perforations.…”

Section: Introductionmentioning

confidence: 99%

Investigation into the Acoustic Properties of Polylactic Acid Sound-Absorbing Panels Manufactured by 3D Printing Technology: The Influence of Nozzle Diameters and Internal Configurations

Matei,

Pop,

Zaharia

et al. 2024

Materials

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Sound-absorbing panels are widely used in the acoustic design of aircraft parts, buildings and vehicles as well as in sound insulation and absorption in areas with heavy traffic. This paper studied the acoustic properties of sound-absorbing panels manufactured with three nozzle diameters (0.4 mm, 0.6 mm and 0.8 mm) by 3D printing from three types of polylactic acid filaments (Grey Tough PLA; Black PLA Pro; Natural PLA) and with six internal configurations with labyrinthine zigzag channels (Z1 and Z2). The absorption coefficient of the sample with the Z2 pattern, a 5.33 mm height, a 0.6 mm nozzle diameter and with Black PLA Pro showed the maximum value (α = 0.93) for the nozzle diameter of 0.6 mm. Next in position were the three samples with the Z1 pattern (4 mm height) made from all three materials used and printed with a nozzle diameter of 0.4 mm with a sound absorption coefficient value (α = 0.91) at 500 Hz. The highest value of the sound transmission loss (56 dB) was found for the sample printed with a nozzle size of 0.8 mm with the Z2 pattern (8 mm height) and with Black PLA Pro. The extruded material, the nozzle diameter and the internal configuration had a significant impact on the acoustic performance of the 3D-printed samples.

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Section: Introductionmentioning

confidence: 99%

Investigation into the Acoustic Properties of Polylactic Acid Sound-Absorbing Panels Manufactured by 3D Printing Technology: The Influence of Nozzle Diameters and Internal Configurations

Matei,

Pop,

Zaharia

et al. 2024

Materials

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show abstract

“…

Open-cell aluminum foam has been widely used in various fields such as the automotive industry, rail transportation, construction industry, aerospace, and military because of its good sound absorption ability. [1][2][3][4][5] In comparison to other preparation processes, such as the template method, [6][7][8] the directional foaming method, [9] and additive manufacturing technology, [10] infiltration casting has the advantages of a simple process and low cost.Therefore, it is one of the most used approach for preparing acoustic aluminum foam. [11,12] Aluminum foam has good sound absorption properties in the mid-to-highfrequency range, as the sound energy dissipation is proportional to the square of the frequency.

…”

mentioning

confidence: 99%

“…Open-cell aluminum foam has been widely used in various fields such as the automotive industry, rail transportation, construction industry, aerospace, and military because of its good sound absorption ability. [1][2][3][4][5] In comparison to other preparation processes, such as the template method, [6][7][8] the directional foaming method, [9] and additive manufacturing technology, [10] infiltration casting has the advantages of a simple process and low cost.…”

mentioning

confidence: 99%

Sound Absorption Performance and Mechanism of Aluminum Foams with Double Main Pore‐Porous Cell Wall Structure

Huang

Zuo

et al. 2023

Adv Eng Mater

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To enhance the sound absorption performance of open‐cell aluminum foam, the double main pores‐porous cell walls (DMP‐PCW) aluminum foams via infiltration casting of preforms mixed with two sizes of NaCl particles are prepared. The pore structure, sound absorption performance, and mechanism of DMP‐PCW aluminum foam are investigated. The pore structure consists of double‐sized main pores similar to the NaCl particles and the cell wall pores formed by the connections between NaCl particles. It is found that the static flow resistivity of DMP‐PCW aluminum foam reaches an optimum value of 28105 Pa.s m−2 when the volume proportion of small main pores increases, the size of cell wall pores decreases, and the number of cell wall pores per unit main pore surface area (NPPA) increases. At 800–6300 Hz, the average absorption coefficient is 0.89. In addition, the Wilson model predicts the sound absorption properties of DMP‐PCW aluminum foam. The predicted values agree well with the measured values. The finite‐element acoustic simulations and dynamic viscous‐thermal permeability calculations reveal that the improved sound absorption performance of DMP‐PCW aluminum foam is correlated to the enhanced sound transmission caused by increased NPPA and increased viscous‐thermal loss due to the double main pore structure.

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Topology optimization with a parametric level set method for double porosity poroelastic sound-absorbing structures

Li,

Wang,

Zhang

et al. 2024

Struct Multidisc Optim

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Sound absorption of macro-perforated additively manufactured media

Cited by 14 publications

References 30 publications

Investigation into the Acoustic Properties of Polylactic Acid Sound-Absorbing Panels Manufactured by 3D Printing Technology: The Influence of Nozzle Diameters and Internal Configurations

Investigation into the Acoustic Properties of Polylactic Acid Sound-Absorbing Panels Manufactured by 3D Printing Technology: The Influence of Nozzle Diameters and Internal Configurations

Sound Absorption Performance and Mechanism of Aluminum Foams with Double Main Pore‐Porous Cell Wall Structure

Topology optimization with a parametric level set method for double porosity poroelastic sound-absorbing structures

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