On the Sound Absorption Improvement of Water Hyacinth and Coconut Husk based Fiber Reinforced Polymer Panel

Abstract

This paper emphasizes on the sound absorption improvement of the water hyacinth and coconut husk based fiber reinforced polymer (FRP) panel. The dry water hyacinth and coconut husk were milled and sieved before it mixed with polyester and methyl ethyl ketone peroxide as the catalyst. The composition is 200 ml, 25 grams, and 20 ml for the polyester, fiber, and catalyst respectively. The mixture casting is by using a square tray to form a flat FRP panel through open air drying without any compaction process. Three different approaches i.e. multiple quarter wavelength resonators, air cavity, and front fibrous layer inclusion are implemented to the FRP to improve its sound absorption performance. The entire measurements conducted by using transfer function based impedance tube technique refer to ASTM E-1050-98 standard. B&K 4206. It found that the proposed approaches are increase sound absorption coefficient of the bulk FRP significantly. The best performance occurred on the coconut husk based FRP when the 8 of quarter wavelength resonators combined with the fibrous layer. Sound absorption increased accordingly to above of 0.7 starting from 1.5 kHz. On the other side, the air cavity shows similar influence on the entire test sample due to Helmholtz resonance mechanism.

Tailoring Acoustic Performances of Resin Reinforced Biomass Fiber-Based Panel with Single and Multiple Tailed Cavity Inclusions for Interior Work

“…The highest increment percentage is indicated by the 30 mm thickness of the kenaf specimens by as much as 5.8538%, while the lowest increment percentage was indicated by the 15 mm thickness of coco-husk at 1.4468%. Figure 6 describes how this research compares to previous research conducted by Setyowati et al [1]. The graph compares sound absorption performance according to the different treatments between the additional quarter wavelength resonators and single-multiple tailed cavity inclusions on three kinds of biomass fibers reinforced with a polyester resin.…”

“…Various kinds of treatments such as surface modification with resonators, the inclusion of additional air cavities, and fibrous sheet layering have been considered by Lee and Swenson [24], Lee and Chen [25], Setyowati et al [1] and Zulkifli et al [26]. Lee and Swenson stated that the methods to create good porous materials with sound absorption abilities were limited, due to the required thickness and the exorbitant cost of fabrication.…”

“…The comparative measurement between 8-hole resonators and tailed-cavity inclusion samples on their sound absorption behavior was scrupulously observed. The treatments were conducted by drilling the samples to form both 3 mm diameter quarter wavelength resonators [1] and 6 mm diameter single-multiple tailed cavity inclusions, as indicated in Figure 1b.…”

“…Many researchers have proposed techniques and methods to create acoustic materials and to improve their acoustic behavior [1][2][3]. In our previous research, water hyacinth and coconut husk fiber panels were compared in terms of their acoustic performances [1]. In this research, 25 grams of natural fibers were composed with 200 mL polyester fibers and 20 mL catalyst.…”

The Acoustical Performance of Water Hyacinth Based Porous-Ceramic Compared to the Biomass Fiber Composites for Architecture Application

“…During its development, Eichhornia crassipes is dried and powdered. This research not only focuses on porous hexagonal ceramic innovation by using water hyacinth powder in clay mixtures, in that it has the ability of absorption and material insulation but also compares the acoustic performance of porous ceramic with water hyacinth-based composites obtained in previous studies [1]. Meanwhile, several studies on acoustic materials from natural materials have also been carried out [2], [3].…”