Sound Absorption and Insulation Properties of a Polyurethane Foam Mixed with Electrospun Nylon-6 and Polyurethane Nanofibre Mats

2019 ◽  
Vol 19 (6) ◽  
pp. 3558-3563 ◽  
Author(s):  
Mira Park ◽  
Hyeon Ku Park ◽  
Hye Kyoung Shin ◽  
Dawon Kang ◽  
Bishweshwar Pant ◽  
...  
Keyword(s):  
Polyurethane Foam ◽  
Sound Absorption ◽  
Nylon 6 ◽  
Sound Insulation ◽  
Electrospinning Technique ◽  
Acoustic Characteristics ◽  
Impedance Tube ◽  
Textile Materials ◽  
Electrospun Nanofibres ◽  
Impedance Tube Method

In recent years, noise has become a serious hazard and can have permanent biological and psychological effects on humans and other organisms in nature. Textile materials are commonly used as absorbent acoustic materials for noise reduction. This work examines the use of electrospun nylon-6 and polyurethane nanofibres (PU NFs) to improve the sound absorption and sound insulation properties of polyurethane foam. In this work, nylon-6 and polyurethane nanofibres were prepared by an electrospinning technique and were glued to a polyurethane foam. The sound absorption coefficient of the materials was measured by the impedance tube method. An impedance tube was used to measure the sound absorption and airborne sound insulation. The results showed decreased sound absorption properties, whereas the sound insulation was highly enhanced when polyurethane/nanofibre hybrids were used, as compared to the pristine polyurethane foam. Furthermore, the sound insulation properties of polyurethane foam were highly enhanced when the foam was combined with nylon-6 NFs, compared with the polyurethane foam with PU NFs. Therefore, by investigating the acoustic characteristics of electrospun nylon-6 and PU nanofibres, we believe that this study can broaden the application of electrospun nanofibres for sound pollution control.

scholarly journals Mathematical model of acoustic characteristics of polyurethane foam used for sound absorption in aerospace engineering

2021 ◽  
Vol 20 (2) ◽  
pp. 53-62
Author(s):  
A. V. Kuznetsov ◽  
A. A. Igolkin ◽  
A. I. Safin ◽  
A. O. Pantyushin
Keyword(s):  
Mathematical Model ◽  
Finite Element ◽  
Absorption Coefficient ◽  
Finite Element Modeling ◽  
Sound Absorption ◽  
Sound Absorption Coefficient ◽  
Sound Insulation ◽  
Space Technology ◽  
Acoustic Characteristics ◽  
Element Modeling

When solving the problem of reducing the acoustic load on the spacecraft during the launch and flight of the launch vehicle, finite element modeling of acoustic processes under the nose fairing is carried out. To successfully solve this problem, a mathematical model of the acoustic characteristics of the material used for sound insulation is required. The existing mathematical models of the acoustic characteristics of materials are not suitable for the material under consideration that can be used in rocket and space technology to increase the sound insulation of the payload fairing + transfer compartment assembly. To obtain the sound absorption coefficient of the material, an impedance tube measurement method with two microphones is used. Using the method of differential evolution, the coefficients of a mathematical model of acoustic characteristics of the Delany-Bazley type for the specified material are selected. The sound absorption coefficient obtained experimentally and that calculated using the obtained model are compared; the average and maximum values of the error are shown. The resulting model will make it possible to carry out finite element modeling of acoustic and vibroacoustic processes under the nose fairing, taking into account the location of the sound-absorbing material.

scholarly journals Comparison of sound absorption characteristics measured by impedance tube method and ensemble averaging technique on porous clay bricks

2021 ◽  
Vol 42 (3) ◽  
pp. 154-157
Author(s):  
Siwat Lawanwadeekul ◽  
Reiji Tomiku ◽  
Noriko Okamoto ◽  
Toru Otsuru ◽  
Masahiro Masuda ◽  
...  
Keyword(s):  
Sound Absorption ◽  
Ensemble Averaging ◽  
Impedance Tube ◽  
Averaging Technique ◽  
Clay Bricks ◽  
Impedance Tube Method ◽  
Absorption Characteristics

scholarly journals Identification of uncertainty levels of acoustic properties of biocomposites under different mounting conditions in impedance tube tests

2021 ◽  
Vol 69 (5) ◽  
pp. 392-400
Author(s):  
Hasan Koruk ◽  
Yusuf Saygili ◽  
Garip Genc ◽  
Kenan Y. Sanliturk
Keyword(s):  
Sound Absorption ◽  
Transmission Loss ◽  
Acoustic Properties ◽  
Petroleum Jelly ◽  
Impedance Tube ◽  
Hard Materials ◽  
Inner Diameter ◽  
Acoustic Properties Of Materials ◽  
Impedance Tube Method ◽  
Textured Materials

Impedance tube method is widely used to measure acoustic properties of materials. Although this method yields reliable acoustic properties for soft textured materials, uncertainty levels of measured acoustic properties for hard materials, including biocomposites, can be quite large, mainly due to uncertain mounting conditions. Here, the effects of mounting conditions on the acoustic properties of biocomposites in an impedance tube are investigated. First, nominally identical biocomposite samples with a diameter equal to the inner diameter of impedance tube are manufactured and their acoustic properties are determined. As hard materials practically cause fitting problems in the impedance tube, the diameters of samples are reduced, as in practice, by small amounts and acoustic properties of modified samples are determined. Furthermore, in order to match the diameters of samples to the inner diameter of impedance tube, different materials such as tape, petroleum jelly and cotton are applied around samples to close the air gap between the samples and the tube's inner wall. All the results are compared, and the uncertainty levels caused by different mounting conditions on the acoustic properties of biocomposites are identified. The results show that the transmission loss (TL) measurements are dramatically affected by the mounting conditions while the sound absorption conditions are less sensitive to the mounting conditions. The deviations in the measured TL levels are highest for the samples with tape and wax (10–15 dB). On the other hand, the deviations in the measured sound absorption coefficients are highest for the samples with cotton and tape (1–2%).

Foliar Sound Absorption Capacities of Tree Leaves by Impedance Tube Method

2021 ◽  
pp. 1-7
Author(s):  
Payal Rane - Acharekar ◽  
Ambika Joshi ◽  
Nitesh Joshi
Keyword(s):  
Sound Absorption ◽  
Tree Leaves ◽  
Impedance Tube ◽  
Impedance Tube Method

The Analysis of Acoustic Characteristics and Sound Absorption Coefficient of Needle Punched Nonwoven Fabrics

2014 ◽  
Vol 9 (2) ◽  
pp. 155892501400900 ◽  
Author(s):  
Fereshteh Shahani ◽  
Parham Soltani ◽  
Mohammad Zarrebini
Keyword(s):  
Sound Absorption ◽  
Surface Effect ◽  
High Volume ◽  
Areal Density ◽  
Work Place ◽  
Related Phenomenon ◽  
Sound Waves ◽  
Acoustic Characteristics ◽  
Textile Materials ◽  
Nonwoven Fabrics

Control of acoustical related phenomenon in environments, such as work place and residential homes, using various textile materials has gained paramount importance. Nonwoven fabrics in general are ideal acoustical insulator due to their high volume-to-mass ratio. This research examined acoustic characteristics of structured needle punched floor coverings in relation to fiber fineness, surface effect, punch density, areal density, and chemical bonding process. Sound absorption of the test samples was measured using the impedance tube method. Results indicate that fabrics produced from finer fibers absorb sound waves more efficiently. It was found that, samples with no surface effect enjoy the maximum sound absorption. This is followed by velour and cord surface effect samples. It was established that, higher levels of punch density and higher areal density caused the noise reduction coefficient (NRC) of the fabrics to be increased. It was also found that chemical finishing adversely affected the sound absorption property of the samples.

scholarly journals The Use of Fabrics to Improve the Acoustic Absorption: Influence of the Woven Fabric Thread Density Over a Nonwoven

2018 ◽  
Vol 18 (3) ◽  
pp. 269-280 ◽  
Author(s):  
Pilar Segura-Alcaraz ◽  
Jorge Segura-Alcaraz ◽  
Ignacio Montava ◽  
Marilés Bonet-Aracil
Keyword(s):  
Sound Absorption ◽  
Woven Fabric ◽  
Acoustic Absorption ◽  
Human Beings ◽  
Absorption Coefficients ◽  
Acoustic Characteristics ◽  
Resistive Layer ◽  
Acoustic Absorption Coefficient ◽  
Impedance Tube Method

Abstract Noise is frequently unnoticed, but it is one of the causes of unhealth for human beings reducing people’s quality of life. There are many materials that can be considered as acoustic absorbents. Textiles can be used to both improve the acoustic quality of and to decorate the room where they have been placed. In this study, we used some fabrics with 15, 20 and 30 ends/cm and 15, 20 and 30 picks/cm. The acoustic absorption coefficient was measured when the fabric was added as a resistive layer on top of a nonwoven made of polyester fiber. Results evidence that these fabrics can be efficiently used to modify the acoustic absorption of the nonwoven. Sound absorption coefficients measured via the impedance tube method show that these modifications occur. The results show how it is possible to improve the acoustic characteristics of a simple nonwoven to obtain sound absorption coefficients close to values of 1 at different frequencies by choosing a fabric with the appropriate combination of warp and weft count.

Assessment of the Acoustic Properties in Octavo Bands for Selected Polyurethane Materials

2016 ◽  
Vol 246 ◽  
pp. 7-10
Author(s):  
Tomasz Małysa ◽  
Krzysztof Nowacki ◽  
Teresa Lis
Keyword(s):  
Polyurethane Foam ◽  
Sound Absorption ◽  
Acoustic Properties ◽  
Frequency Range ◽  
Absorption Coefficients ◽  
Impedance Tube

The article presents the acoustic properties of selected polyurethane materials. The study involved a porous polyurethane foam primary and secondary, for whom assigned the value of sound absorption coefficients in the frequency range of 100 – 1250 Hz. The study was conducted in impedance tube Kundt.

scholarly journals Performance of Nonwoven Cellulosic Composites for Automotive Interiors

2000 ◽  
Vol os-9 (2) ◽  
pp. 1558925000OS-90
Author(s):  
D.V. Parikh ◽  
T.A. Calamari ◽  
J.C. Myatt
Keyword(s):  
Competitive Advantage ◽  
Noise Reduction ◽  
Perceived Value ◽  
Sound Level ◽  
Passenger Compartment ◽  
Acoustic Characteristics ◽  
Impedance Tube ◽  
Absorbing Materials ◽  
The Individual ◽  
Impedance Tube Method

Finding methods to provide a quiet passenger compartment in a car are highly sought after by automobile manufacturers. The ability to reduce noise inside the vehicle enhances the perceived value of the vehicle to the consumer and offers a competitive advantage to the manufacturer. Several methods to reduce noise and its sources are employed, one of which reduces noise in the passenger compartment using sound absorbing materials attached to various components such as doors, quarter panels, trunk sides and floors, headliners and others. This study attempts to quantify the characteristics of several cellulosic-based nonwovens to act as efficient absorbers, reducing the overall sound level in the passenger compartment as measured by ASTM C-384 “Impedance and Absorption of Acoustic Materials by the Impedance Tube Method.” The results of testing demonstrate that each of the cellulosic-based nonwoven composites contribute to the absorptive properties of the components and are effective for overall noise reduction in the vehicle. The individual acoustic characteristics of the various vehicles determine the type and amount of material required to provide the best results.

scholarly journals STUDY AND ANALYSIS ON SOUND ABSORBING AND NOISE REDUCING PERFORMANCE OF TIMBER CONSTRUCTION WALL BASED ON ACOUSTIC SPIRAL MATASURFACE

Wood Research ◽  
2021 ◽  
Vol 66 (3) ◽  
pp. 341-352
Author(s):  
Haiyan Fu ◽  
Xinyue Zhao ◽  
Patrick Adjei ◽  
Zheng Wang ◽  
Xiaoli Wu
Keyword(s):  
Absorption Coefficient ◽  
Sound Absorption ◽  
Low Frequency ◽  
Sound Absorption Coefficient ◽  
Impedance Tube ◽  
Frequency Sound ◽  
Timber Construction ◽  
Absorption Performance ◽  
Impedance Tube Method ◽  
Structural Layer

Based on acoustic spiral metasurface, a spiral structural layer was designed to apply to timber construction interior wall. The sound absorption coefficient was measured by impedance tube method and compared with Helmholtz resonance structural layer, solid structural layer and air layer in traditional wall. The results show that the combination of the spiral structural layer and the wall can optimize the sound absorption performance of the wall in the medium and low frequency. Without reducing the overall sound-absorbing performance of the wall, can achieve perfect sound absorption in some medium and low frequency sound bands.

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