Acoustic insulation and absorption mechanism of metallic hollow spheres composites with different polymer matrix

Yu, Tao; Jiang, Fengchun; Wang, Jiahao; Wang, Zhenqiang; Chang, Yunpeng; Guo, Chunhuan

doi:10.1016/j.compstruct.2020.112566

Cited by 37 publications

(27 citation statements)

References 35 publications

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“…The magnitude of acoustic impedance is related to the density and sound velocity of the dielectric materials. 39,51,52 Because the density and sound velocity of these three materials are quite different, their acoustic impedances also differ from each other. When the sound waves travel from one medium to another, because of the considerable difference of acoustic impedance between the mediums, the reflection and diffraction of sound wave will occur more easily at the interface.…”

Section: Resultsmentioning

confidence: 99%

“…In recent years, metallic hollow spheres have been widely reported in the field of metal foams, [33][34][35][36][37][38] while there are few reports about hollow metal spheres/polymer composites. Yu et al 39 has previously studied the effect of different polymer molecular structures on the acoustic properties of metallic hollow spheres/polymer composites. It is found that silicone rubber with good molecular elasticity has better sound insulation performance than PU, but its sound absorption performance is poor.…”

Section: Introductionmentioning

confidence: 99%

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Properties and mechanism of a novel metallic‐hollow‐spheres/polyurethane acoustic composite

Jiang

et al. 2020

J of Applied Polymer Sci

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In this article, 316L stainless steel hollow spheres (316L HS) and polyurethane (PU) resins were used to prepare a novel metallic-hollow-sphere/polyurethane (MHSP) acoustic composite by casting. The acoustic experimental results of this composite revealed that compared to monolithic PU, the sound transmission loss of the composites increased and the maximum sound absorption peak shifted to lower frequency with the change of acoustic impedance and resonance frequency. When the surface of metallic hollow sphere used in MHSP composite was modified by silane coupling agent, the sound insulation and sound absorption performance of MHSP composites were further improved. This is related to the addition of the molecular layer of coupling agent between MHSP matrix. In addition, the addition of silane coupling agent creates PU foaming in matrix, resulting in a large number of pores and gaps that can increase the sound waves energy loss through air friction and heat exchange.

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Properties and mechanism of a novel metallic‐hollow‐spheres/polyurethane acoustic composite

Jiang

et al. 2020

J of Applied Polymer Sci

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“…The sound insulation performance of the one-dimensional phononic crystal laminated composites in this study were tested by BSWA422/477 impedance tube. The principle of sound insulation test was based on ASTM E2611-09 standard, [31][32][33][34][35] that is, the sound signal and data are collected by four microphones, and the STL was calculated by the transfer matrix method. The size of low frequency (64$1000 Hz) sample was 100 mm in diameter and 18 mm in thickness, and the high requency (1000$6300 Hz) sample is 30 mm in diameter and 18 mm in thickness.…”

Section: Characterizationmentioning

confidence: 99%

Sound insulation of a novel laminated polymer matrix composite containing metallic hollow spheres based on phononic crystal structure design

Jiang

Cao

et al. 2021

Polymers for Advanced Techs

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As a noval functional material designed and prepared artificially, one-dimensional phononic crystal has a great prospect in the field of noise reduction. In this study, a novel one-dimensional phononic crystal metamaterial based on the metallic hollow spheres (MHS)/polymer matrix laminated composites was designed and prepared.The result of impedance tube test shows that the laminated composite has excellent sound insulation performance. The incident direction of sound waves has little effect on the sound insulation performance of the laminated composites. The average sound insulation of MHSP/SR-LC (MHSP side) was 44.4% higher than that of SR and 272.0% higher than that of PU. After analysis, it can be found that the average sound insulation of laminated composites increases with the acoustic impedance increasing, but the equivalent mass density and equivalent bulk modulus have little effect on it. The metallic hollow spheres can increase the sound energy loss by extending the transmission path of sound waves, andit can also improve the sound insulation by changing the density, elastic, and hardness of SR and PU matrix to increase the resonance strength of the spring-mass oscillator. This work may open up new possibilities for the development of novel acoustic materials applied in noise control.

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“…Addition-molded room temperature vulcanized silicone rubber is an ideal non-toxic and harmless functional material, meeting the requirement of green environmental protection [ 15 , 16 , 17 ]. By introducing chemical foaming agents, physical foaming agents or pore forms into the matrix, cell structures inside the silicone rubber foams can be tailored via different additive contents and the vulcanization process.…”

Section: Introductionmentioning

confidence: 99%

“…By introducing chemical foaming agents, physical foaming agents or pore forms into the matrix, cell structures inside the silicone rubber foams can be tailored via different additive contents and the vulcanization process. However, silicone rubber foams prepared by traditional chemical foaming methods mainly form the closed-cell structure, which has poor noise absorption efficiency in a narrow frequency band, limiting its wide application for sound absorption [ 15 , 16 , 18 ]. It has been well established that open cell porous materials exhibit higher efficiency than close cell porous materials in absorbing sound energy due to optimal air-flow resistance and tortuosity by passing through longer path, which is analogous to increasing the thickness of the foam.…”

Section: Introductionmentioning

confidence: 99%

Improved Mechanical and Sound Absorption Properties of Open Cell Silicone Rubber Foam with NaCl as the Pore-Forming Agent

et al. 2021

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Porous materials hold great potential in the field of sound absorption, but the most abundantly used materials, such as Polyurethane (PU) foam and polyvinyl chloride (PVC) foam, would inevitably bring environmental harms during fabrication. In this study, the nontoxic addition-molded room temperature vulcanized silicone rubber is chosen as the matrix, and NaCl particles are chosen as the pore forming agent to prepare open cell foams via the dissolve-separating foaming method. The effect of different amounts of NaCl (0–100 phr) on the cell structure, mechanical and sound absorption properties is investigated and analyzed. The results indicate that the cell structure could be tailored via changing the addition amount of NaCl, and open cell silicon rubber foams could be achieved with more than 20 phr NaCl addition. Open cell silicon foams show the most effective sound absorption for sound waves in middle frequency (1000–2000 Hz), which should be attributed to the improved impedance matching caused by the open cell structures. Additionally, the mechanical properties, including hardness, tensile strength and corresponding elastic properties, gradually decay to a steady value with the increasing addition amount of NaCl. Therefore, open cell silicone rubber foams are capable of sound absorption in middle frequency.

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Acoustic insulation and absorption mechanism of metallic hollow spheres composites with different polymer matrix

Cited by 37 publications

References 35 publications

Properties and mechanism of a novel metallic‐hollow‐spheres/polyurethane acoustic composite

Properties and mechanism of a novel metallic‐hollow‐spheres/polyurethane acoustic composite

Sound insulation of a novel laminated polymer matrix composite containing metallic hollow spheres based on phononic crystal structure design

Improved Mechanical and Sound Absorption Properties of Open Cell Silicone Rubber Foam with NaCl as the Pore-Forming Agent

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