Acoustic properties of a porous polycarbonate material produced by additive manufacturing

Liu, Zhengqing; Zhan, Jiaxing; Fard, Mohammad

doi:10.1016/j.matlet.2016.06.045

Cited by 88 publications

(61 citation statements)

References 18 publications

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“…The obtained sound absorbing coefficients of the two metal foams in the frequency range of 100 Hz ~ 1000 Hz were shown in figure 2. It could be found that for the same material of metal foam, no matter copper foam or iron foam, the sound absorbing coefficients increased along with the increase of thickness from 5 mm to 30 mm in most detected frequency points, which was coincident with the results reported in the research of sound absorbing performances of the porous materials [13][14][15]. Meanwhile, it could be observed that the sound absorbing coefficients of the two metal foams in the low frequency range were low, and the maximum was no more than 40%.…”

Section: Pure Metal Foam Modesupporting

confidence: 86%

Comparison of sound absorbing performances of copper foam and iron foam with the same parameters

Yang¹,

Shen²,

Xu³

et al. 2018

IOP Conf. Ser.: Mater. Sci. Eng.

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Abstract. Sound absorbing performances of the copper foam and the iron foam with the same parameters were investigated by the AWA6128A detector according to standing wave method. Two modes were investigated, which included the pure metal foam mode and the combination mode with the settled thickness of metal foam. In order to legibly compare the sound absorbing coefficients of the two metal foams, the detected sound frequency points were divided into the low frequency range (100 Hz ~ 1000 Hz), the middle frequency range (1000 Hz ~ 3200 Hz), and the high frequency range (3500 Hz ~ 6000 Hz). Sound absorbing performances of the two metal foams in the two modes were discussed within the three frequency ranges in detail. It would be calculated that the average sound absorbing coefficients of copper foam in the pure metal foam mode were 12.6%, 22.7%, 34.6%, 43.6%, 51.1%, and 56.2% when the thickness was 5 mm, 10 mm, 15 mm, 20 mm, 25 mm, and 30 mm. meanwhile, in the combination mode, the average sound absorbing coefficients of copper foam with the thickness of 10 mm were 30.6%, 34.8%, 36.3%, and 35.8% when the cavity was 5 mm, 10 mm, 15 mm, and 20 mm. In addition, those of iron foam in the pure metal foam mode were 13.4%, 20.1%, 34.4%, 43.1%, 49.6%, and 56.1%, and in the combination mode were 25.6%, 30.5%, 34.3%, and 33.4%.

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Section: Pure Metal Foam Modesupporting

confidence: 86%

Comparison of sound absorbing performances of copper foam and iron foam with the same parameters

Yang¹,

Shen²,

Xu³

et al. 2018

IOP Conf. Ser.: Mater. Sci. Eng.

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show abstract

“…The Micro-Electro-Mechanical Systems were utilized to fabricate ultra-micro perforated MPPs for acoustic impedance and an absorption improvement [24]. Recently, Liu et al [25,26] introduced the 3D printing technique for high-precision and fast fabrication of MPPs as a pioneer. The Stereolithography Apparatus (SLA) was employed for MPP manufacturing to study the effects of the perforation angle and air gap distance on sound absorption [25].…”

Section: Introductionmentioning

confidence: 99%

“…Recently, Liu et al [25,26] introduced the 3D printing technique for high-precision and fast fabrication of MPPs as a pioneer. The Stereolithography Apparatus (SLA) was employed for MPP manufacturing to study the effects of the perforation angle and air gap distance on sound absorption [25]. Polyjet was applied to fabricate MPPs with different perforation ratios at a high-frequency range (1500-5500 Hz) and a high accuracy of the micro-circular perforations with a diameter of 0.6 mm was reported [26].…”

Section: Introductionmentioning

confidence: 99%

3D Printing of Polymeric Multi-Layer Micro-Perforated Panels for Tunable Wideband Sound Absorption

et al. 2020

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The increasing concern about noise pollution has accelerated the development of acoustic absorption and damping devices. However, conventional subtractive manufacturing can only fabricate absorption devices with simple geometric shapes that are unable to achieve high absorption coefficients in wide frequency ranges. In this paper, novel multi-layer micro-perforated panels (MPPs) with tunable wideband absorption are designed and fabricated by 3D printing or additive manufacturing. Selective laser sintering (SLS), which is an advanced powder-based 3D printing technique, is newly introduced for MPP manufacturing with polyamide 12 as the feedstock. The acoustic performances of the MPPs are investigated by theoretical, numerical, and experimental methods. The results reveal that the absorption frequency bandwidths of the structures are wider than those of conventional single-layer MPPs, while the absorption coefficients remain comparable or even higher. The frequency ranges can be tuned by varying the air gap distances and the inter-layer distances. Furthermore, an optimization method is introduced for structural designs of MPPs with the most effective sound absorption performances in the target frequency ranges. This study reveals the potential of 3D printing to fabricate acoustic devices with effective tunable sound absorption behaviors and provides an optimization method for future structural design of the wideband sound absorption devices.

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“…Acoustic properties of an additively manufactured porous polycarbonate were evaluated by Liu et al [46]. Nansha and Hong [47] developed a micro-helix metamaterial by 3D printing and showed that helix vestibule and cavity depth had a significant impact on .…”

Section: Introductionmentioning

confidence: 99%

Acoustic absorption of passive destructive interference cavities

Arjunan

2019

Materials Today Communications

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Acoustic products are primarily designed for broadband acoustic absorption.However, frequency-dependent acoustic absorption featuring passive designbased solutions are necessary to combat the growing noise pollution.Accordingly, this research investigates the targeted creation of sound absorption as a function of geometry utilising the principle of Acoustic Interference (AI). A methodology to design freeform geometries that can create targeted acoustic absorption is presented. The effectiveness of this methodology is then experimentally validated while quantifying the influence of length, diameter and geometry orientation. The results establish that AI has the potential to create 'near perfect' sound absorption that can be customised depending on the source frequency. The design freedom revealed by this study allows the exploitation of freeform geometries as passive highefficiency sound absorbing devices.

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Acoustic properties of a porous polycarbonate material produced by additive manufacturing

Cited by 88 publications

References 18 publications

Comparison of sound absorbing performances of copper foam and iron foam with the same parameters

Comparison of sound absorbing performances of copper foam and iron foam with the same parameters

3D Printing of Polymeric Multi-Layer Micro-Perforated Panels for Tunable Wideband Sound Absorption

Acoustic absorption of passive destructive interference cavities

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