Acoustic properties of additive manufactured narrow tube periodic structures

Akiwate, Deepak C.; Date, Mahendra D.; Venkatesham, B; Suryakumar, S.

doi:10.1016/j.apacoust.2018.02.022

Cited by 23 publications

(9 citation statements)

References 18 publications

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“…A micro lattice metamaterial, composed of precise and regular material structure, for acoustic attenuation applications were proposed by Cai and Yang [24]. 3D printed thin tube repeated structures were used as quarter resonators to reduce sound energy of certain frequencies [25,26]. Structures formed by the recurring order of rods achieved by 3D printing with predefined infill percentage can be used as acoustic insulators over a broad frequency range, like regular foams.…”

Section: Introductionmentioning

confidence: 99%

Quasi-static indentation and sound-absorbing properties of 3D printed sandwich core panels

Goh

Neo

Dikshit

et al. 2021

Jnl of Sandwich Structures & Materials

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The use of 3D printing to produce acoustic panels with good mechanical and acoustic properties was investigated in this paper. Various fiber layups of the fiberglass face sheet and core designs were fabricated and tested for their indentation resistance and acoustic absorption performance. It was found that the bidirectional face sheet layup exhibited the best indentation energy absorption recording 4.2 J, which is 37% more than the 45-degree layout and 66% more than the quasi-isotropic layup. The specific energy absorption of the hybrid honeycomb core is the best among the three core designs recording 404 J/kg, which is 56% higher than the corrugated triangle with horizontal beam core (359 J/kg) and 20% higher than double ellipse core (335 J/kg). Computed-Tomography (CT) scan was used to study the fracture behavior of the sandwich structures. It was found that the bidirectional layup exhibited a different failure mode as compared to the 45-degree and quasi-isotropic layup. In terms of the acoustic properties, the face sheets with various layup patterns have a low acoustic absorption coefficient with minimal differences from each other at low frequencies (500 Hz–3000 Hz) and have higher absorption coefficients with greater differences from each other at frequencies between 3000 Hz–6500 Hz. The absorption curve was significantly affected by the design of the core. The orientation of the core also comes into play if the core is asymmetrical. The hybrid honeycomb sandwich structure was the optimal structure among the three designs for balanced indentation resistance and acoustic insulation.

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Section: Introductionmentioning

confidence: 99%

Quasi-static indentation and sound-absorbing properties of 3D printed sandwich core panels

Goh

Neo

Dikshit

et al. 2021

Jnl of Sandwich Structures & Materials

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“…treatments have yet been optimized and precisely manufactured to the author's knowledge. Fortunately, recent improvements in additive manufacturing have allowed the production of efficient acoustic treatments such as helical metametarials 12,13 , slow-sound based metamaterials 6,14 and porous open-cells materials 15 . This technology enables an efficient control of the micro-structure 2 design, because the pore shapes and dimensions can be simply adjusted for the target macroscopic properties.…”

Section: Introductionmentioning

confidence: 99%

Optimally graded porous material for broadband perfect absorption of sound

Boulvert

Cavalieri

Costa-Baptista

et al. 2019

Journal of Applied Physics

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This article presents a numerical optimization procedure of continuous gradient porous layer properties to achieve perfect absorption under normal incidence. This design tool is applied on a graded porous medium composed of a periodic arrangement of ordered unit cells allowing to link the effective acoustic properties to its geometry. The best microgeometry continuous gradient providing the optimal acoustic reflection and/or transmission is designed via a nonlinear conjugate gradient algorithm. The acoustic performances of the so-designed continuous graded material are discussed with respect to the optimized homogeneous, i.e. non-graded, and monotonically graded material. The numerical results show a shifting of the perfect absorption peak to lower frequencies or a widening of the perfect absorption frequency range for graded materials when compared to uniform ones. The results are validated experimentally on 3D-printed samples therefore confirming the relevance of such gradient along with the efficiency of the control of the entire design process.

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“…A comparison with other cell/lattice topologies shows a similar trend for the absorption coefficient values in the corresponding frequency ranges. The tetrakaidecahedron cell-based acoustic metamaterial was compared with Akiwate et al ’s (2018) study on quarter tube periodic resonators with a length of 80 mm. It was observed that the first significant absorption peak was in the region of 3,000 Hz and beyond, while in the tetrakaidecahedron cell-based acoustic metamaterial the peak is found in the significantly lower frequency region of 1,500 Hz, with a comparatively smaller sample length (in the range 35 to 45 mm).…”

Section: Resultsmentioning

confidence: 99%

Sound absorption advancements: exploring 3D printing in the development of tetrakaidecahedron cell-based acoustic metamaterials

Shah,

Singh,

Saini

et al. 2024

RPJ

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Purpose This paper aims to study the design and characterization of a 3D printed tetrakaidecahedron cell-based acoustic metamaterial. At present, the mitigation of low-frequency noise involves the utilization of spatially demanding materials for the absorption of sound. These materials lack the ability for targeted frequency control adjustments. Hence, there is a requirement for an approach that can effectively manage low-frequency noise using lightweight and durable materials. Design/methodology/approach The CAD model was created in SolidWorks and was manufactured using the Digital Light Processing (DLP) 3D printing technique. Experimental study and numerical simulations examined the metamaterial’s acoustic absorption. An impedance tube with two microphones was used to determine the absorption coefficient of the metamaterial. The simulations were run in a thermoviscous module. Findings The testing of acoustic samples highlighted the effects of geometric parameters on acoustic performance. Increment of the strut length by 0.4 mm led to a shift in response to a lower frequency by 500 Hz. Peak absorption rose from 0.461 to 0.690 as the strut diameter was increased from 0.6 to 1.0 mm. Increasing the number of cells from 8 to 20 increased the absorption coefficient and lowered the response frequency. Originality/value DLP 3D printing technique was used to successfully manufacture tetrakaidecahedron-based acoustic metamaterial samples. A novel study on the effects of geometric parameters of tetrakaidecahedron cell-based acoustic metamaterial on the acoustic absorption coefficient was conducted, which seemed to be missing in the literature.

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Acoustic properties of additive manufactured narrow tube periodic structures

Cited by 23 publications

References 18 publications

Quasi-static indentation and sound-absorbing properties of 3D printed sandwich core panels

Quasi-static indentation and sound-absorbing properties of 3D printed sandwich core panels

Optimally graded porous material for broadband perfect absorption of sound

Sound absorption advancements: exploring 3D printing in the development of tetrakaidecahedron cell-based acoustic metamaterials

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