Abstract

The present work aimed to investigate the effect of nanofiber enhancement on the sound absorption performance of fibrous materials through a brief review of the recent progress in the field and highlight the current challenges and issues for measuring and modeling the sound absorption coefficient (SAC) of such structures. Moreover, some composite samples consist of polyethylenterephthalat (PET) nonwoven fabric and polyacrylonitrile (PAN) nanofibers web were prepared to be studied as a case study. The nanofiber deposition amounts, nanofiber orientation, and nanofiber layering sequence were chosen as the main variables of samples. Various amounts of deposition were achieved through three different electrospinning (ES) time of 15, 60, and 180 min. The random and aligned orientation of the nanofiber web was obtained by using a rotating collector. The effect of the layering sequence of the nanofiber layer was studied in the form of quadruple-layered assemblies of samples. The results showed that the samples incorporated with the nanofiber layer with 60 min of ES and random orientation when it is used in the second position of the layering sequence have the best performance of sound absorption, mainly at lower critical frequency range. Furthermore, a discussion on some available empirical models and compare the results confirms that there is a need for developing a new approach for measuring and modeling the SAC and consequently designing such absorbers.

摘要

目前的工作旨在通过简要回顾该领域的最新进展来研究纳米纤维增强对纤维材料吸声性能的影响，并强调当前测量和建模此类材料的吸声系数 (SAC) 的挑战和问题。结构。此外，还制备了一些由聚对苯二甲酸乙二醇酯 (PET) 无纺布和聚丙烯腈 (PAN) 纳米纤维网组成的复合样品，以作为案例研究进行研究。选择纳米纤维沉积量、纳米纤维取向和纳米纤维分层顺序作为样品的主要变量。通过 15、60 和 180 分钟的三种不同静电纺丝 (ES) 时间实现了不同量的沉积。通过使用旋转收集器获得纳米纤维网的随机和对齐取向。以样品的四层组装形式研究了纳米纤维层的分层顺序的影响。结果表明，掺入60 min ES和随机取向的纳米纤维层的样品在层序第二位使用时具有最佳的吸声性能，主要在较低的临界频率范围内。此外，对一些可用经验模型的讨论和比较结果证实，有必要开发一种新的方法来测量和模拟 SAC，从而设计这种吸收器。结果表明，掺入60 min ES和随机取向的纳米纤维层的样品在层序第二位使用时具有最佳的吸声性能，主要在较低的临界频率范围内。此外，对一些可用的经验模型的讨论和比较结果证实，有必要开发一种新的方法来测量和模拟 SAC，从而设计这种吸收器。结果表明，掺入60 min ES和随机取向的纳米纤维层的样品在层序第二位使用时具有最佳的吸声性能，主要在较低的临界频率范围内。此外，对一些可用经验模型的讨论和比较结果证实，有必要开发一种新的方法来测量和模拟 SAC，从而设计这种吸收器。