Fabrication of cost-effective double layers composite for efficient sound-absorbing based on sustainable and flame-retardant jute fabrics

Noise pollution is rapidly increasing, posing a health risk, particularly in the low frequency range. Therefore, the development of cost-effective, environmentally friendly and efficient audible sound absorbing materials is a necessary and crucial process. To this end, smart multilayer sound absorber has been developed based on micro-perforated panels and Jute fabrics as renewable and eco-friendly sound-absorbing material. Different perforation shapes have been fabricated and used for micro-perforated panels and optimized. The sound absorption properties for the new developed sound-absorbing system were evaluated inside a two-microphone impedance tube achieving outstanding results. The developed sound-absorbing system achieved higher sound absorption properties recording more 70% at low frequencies range (<500 Hz), also achieved excellent sound absorption coefficient with broad bandwidth. Furthermore, the flammability properties of the used Jute fabrics were evaluated achieving flame retardancy property of 44 mm/min rate of burning and 20% LOI value. Additionally, the Jute fabrics mechanical and surface morphology properties were investigated. Hence, this study presents a smart, cost-effective, flame retardant and efficient absorption system suitable for noise control for a wide applications range.