The Acoustic Characterization of Broom Fibers

Berardi, Umberto; Iannace, Gino; Gabriele, Maria Di

doi:10.1080/15440478.2017.1279995

Cited by 68 publications

(21 citation statements)

References 8 publications

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“…The materials tested have good absorption coefficient values at the medium and high frequencies. These materials can be used to replace traditional absorbent materials such as polyurethane, foam or PET [12,13,14]. Cork sheets with a thickness of 1.5 mm and sheep wool fabrics can also be used as sound-absorbing materials.…”

Section: Methodsmentioning

confidence: 99%

Sound absorption with green materials

Trematerra¹,

Lombardi²

2017

AIP Conference Proceedings

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Green materials are a valid alternative to traditional materials that are by-products of processing oil. At the end of their useful life, green materials can be disposed of without polluting the environment. They are now being used in the construction and automotive industries. While, studies are currently being carried out in the aviation sector on the use of green materials for non-structural components of airplanes. Green materials can be used to improve the acoustic comfort inside buildings as well as mitigate reverberation, echoes effects and reduce the transmission of noise between rooms. In this paper, the acoustic measurements of the properties of green materials are reported. The absorption coefficient of samples of the materials were measured in the frequency range from 200 Hz to 2,000 Hz with an impedance tube, with the flow resistance being measured.

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Section: Methodsmentioning

confidence: 99%

Sound absorption with green materials

Trematerra¹,

Lombardi²

2017

AIP Conference Proceedings

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“…[ 59 ] Broda and Bączek [ 60 ] studied the sound absorption behavior of wool insulating materials developed using nonwoven technique and concluded that the sound absorption grows due to reduction in their air permeability caused by increasing nonwoven thickness. Additionally, the studies investigating the sound absorption properties of Calotropis procera (Apple of Sodom) fibers [ 61 ] and broom fibers [ 62 ] have also been reported.…”

Section: Introductionmentioning

confidence: 99%

Multiphysical theoretical prediction and experimental verification of vibroacoustic responses of fruit fiber‐reinforced polymeric composite

2020

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The acoustic parameters (sound power level and radiation efficiency) of harmonically excited natural fiber (Luffa cylindrica) reinforced polymer composite panel is predicted first time using a coupled finite and boundary element scheme including the mechanical characteristics. First, the frequency values of the freely vibrating Luffa fiber-reinforced composite are obtained through a finite element solution considering the higher-order polynomial kinematic theory to count the structural deformation. Further, the Helmholtz wave equation is solved to evaluate the acoustic data under the harmonic excitation. The proposed multiphysics model is taking care of the structure, the fluid medium and the coupling between them, which, in turn, allows to obtain the solution numerically for the final finished polymer composite product. Further, the model accuracy has been shown by comparing both frequency and sound radiation responses with available published results including the own experimental values. Moreover, the fruit extracted fiber reinforced polymer composite plate components are fabricated using different volume fractions of fiber content and utilized for the numerical analysis considering their experimental properties (mechanical and physical). Finally, the influences of the dimensional variable (aspect ratio, side to thickness ratio and support condition) on the acoustic radiation behavior of the fabricated composite have been examined thoroughly to show their possible real-life applications.

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“…4 For example, broom fibers are an excellent sound absorption material. 5 According to the chemical composition of the materials, the sound absorption foams can be divided into organic foams and inorganic foams. Organic foams include polyurethane foam, polyethylene foam, melamine foam, etc.…”

Section: Introductionmentioning

confidence: 99%

Preparation and acoustic properties of a tung oleic acid‐based polyurethane foam and its stratified structure

Chen

2020

Polymers for Advanced Techs

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Bio-based polyurethane foam, a new green environmental material, has attracted more and more attention of people. In this study, the tung oleic acid-based polyurethane (TOPUF) had been prepared using one-step method. Characterization of the polyurethane foams were carried out by SEM and Fourier transform infrared. The cell morphology, acoustic, and mechanical performance of TOPUF with different contents of tung oleic acid-based polyols (TOAP) were studied and compared with that of a pure petroleum-based polyurethane foam. In addition, the effects of thickness ratio of layers on the acoustic performance of the double-layer composite polyurethane foam (DPUF) were also studied by means of theoretical model and experiment. The results illustrate that TOPUF shows a high absorption performance in the frequency range from 100 to 500 Hz and sound insulation performance in the range from 100 to 6300 Hz. The average sound absorption coefficient of TOPUF is 0.505, and the average transmission loss is 18.818 dB in this case. Furthermore, the average sound absorption coefficient and average transmission loss of DPUFs are 0.545 and 14.528 dB using multilayer structure. Overall, TOPUF has excellent acoustic properties and prodigious application prospects.

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The Acoustic Characterization of Broom Fibers

Cited by 68 publications

References 8 publications

Sound absorption with green materials

Sound absorption with green materials

Multiphysical theoretical prediction and experimental verification of vibroacoustic responses of fruit fiber‐reinforced polymeric composite

Preparation and acoustic properties of a tung oleic acid‐based polyurethane foam and its stratified structure

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