Additive Manufacturing: A Novel Method for Developing an Acoustic Panel Made of Natural Fiber-Reinforced Composites with Enhanced Mechanical and Acoustical Properties

Table 1

Acoustic panels made of natural fibers and their composites along with the methodology and key findings.

Materials used	Methodology	Factors investigated considering acoustic absorption	Key findings	References
Coir fiber	Perforated plates backed by coir fibers	Position of perforation plate and air gap	Acoustic absorption was improved especially in low frequency spectrum	[15]
Jute felts	Perforated plates backed by jute felts	Position of perforation plate and thickness of backed fiber	Usage of perforation plates helped in improving the acoustic absorption in low frequency spectrum without increasing the jute belt’s thickness	[16]
Kenaf fiber	Hot pressing of the perforated plate	Fiber content	The highest acoustic absorption coefficient was recorded as 0.987 at 1521.02 Hz	[14]
Rice husks and sugarcane bagasse	Hot pressing of the perforated plate	Fiber content	The highest acoustic absorption coefficient was recorded as 0.58 at 4000 Hz	[17]
Coir	Hot pressing of the fiber	Density of the fiber layer	Acoustic absorption coefficient was observed to be 0.9 at 4000 Hz	[19]
Corn husk fiber	Molding of fibers	Alkaline treatment of fibers	Acoustic absorption coefficient was 100% in the frequency range between 1600 and 3250 Hz	[18]
Kenaf fiber, wood fiber, hemp fiber, and coconut fiber	Molding of fibers	Thickness of the fiber layer	All the natural fibers exhibited satisfactory acoustic absorption coefficient in midfrequency and high frequency spectrums	[13]
Recycled cotton fiber	3D printed perforated plate made of VisiJet-SL (clear) backed by recycled cotton fibers	Perforation ratio	Significant improvement of acoustic absorption especially in low to midfrequency spectrum	[6]
Natural fiber composites	3D printing of an acoustic panel	—	—	This review