Design of microperforated nanofibrous membrane coated nonwoven structure for acoustic applications

Abstract

In this paper, a promising acoustic structure for noise reduction was prepared, in which microperforated nanofibrous resonant membrane together with nonwovens were used. The role of microperforated nanofibrous film, the effect of perforation parameters, cavity and the assembly sequence of the composite fibrous structure on sound absorption performance has been studied. This structure effectively combined the porous sound absorbing, micro-perforated absorbing and membrane resonance mechanisms, which can improve the sound absorbing performance without weight and thickness penalty offering a competitive advantage in noise reduction. In addition, the composite materials exhibited favorable performance in a wide-frequency regime under the condition of appropriate assembly sequence and perforation parameters.

Enhanced Low Frequency Sound Absorption of Bilayer Nanocomposite Acoustic Absorber Laminated with Microperforated Nanofiber Felt

“…This same peak increases to 0.876 while shifting to 1060 Hz when the perforation rate was further increased to 1.76%. Increasing the perforation rate dampens the resonance amplitude, broadening the sound absorption as in the case of a microperforated PVA nanofiber membrane on a nonwoven fabric fabricated previously . The higher frequency band showed increased absorption with the increase of perforation rate though the absorption of the narrow band at the low frequency tends to gradually decrease.…”

“…Increasing the perforation rate dampens the resonance amplitude, broadening the sound absorption as in the case of a microperforated PVA nanofiber membrane on a nonwoven fabric fabricated previously. 11 The higher frequency band showed increased absorption with the increase of perforation rate though the absorption of the narrow band at the low frequency tends to gradually decrease. This is the case with our composite absorber having a nanofiber felt.…”

“…Since low frequency sound waves are not easily absorbed by traditional sound absorption materials, the use of denser and more rigid materials has been explored, as these have exhibited remarkable absorption efficiency. Such materials include microperforated panels (MPPs) , or dense sheets of materials with a significant number of microperforations, which make use of the resonance that occurs between the incident sound wave and the subsequent vibration of the air inside the perforations. Factors that can affect the sound absorption performance of MPPs include hole diameter and spacing, cavity depth, and panel thickness…”

Benefits of nanotechnology for occupational ergonomic design: A positive step toward more protection of workers' health

“…Nano soundproof panels are microperforated acoustic panels with excellent acoustic qualities and fire resistant. These panels can be manufactured from different nanomaterials including CNT, silica, metal nanoparticles, and so on (Shen et al, 2022; Tao et al, 2021).…”

A Fiber Sliding–Orientation Based Micromechanics Failure Model for Melt-Blown Nonwovens

“…Melt-blown technology refers to the one-step production of microfiber nonwovens based on hot airflow stretching polymer melt. , Nowadays melt-blown nonwovens (MNs) made with fine fiber diameter, small pore size, and high porosity are commonly used in filtration, − adsorption, − thermal insulation, , sound absorption, − and other fields because of the benefits of the quick production process, high production efficiency and solvent-free. For instance, in the realm of air filtration, polypropylene MNs may efficiently block germs and particle pollution as the core filter layer of masks, safeguarding people’s health all over the world. − MNs, however, are frequently coupled with other skeletal materials to satisfy the mechanical demands of commercial applications. ,− In addition to adding to the production time and expense of melt-blown, the composite technique also goes against consumer desire for comfort and lightness. ,, To address this problem, considerable research efforts have been devoted recently to improving the mechanical behavior of MNs through polymer modification, − fiber formation, − and posttreatment. , However, because of the random organization, irregular diameter, and poor interlayer bonding of the fibers in MNs, it is challenging to further improve their mechanical characteristics.…”