Acoustic and structural damping properties of fibrogranular composites made of jute and crumb rubber

Abstract

Synthetic materials are mostly used in sound absorption and structural damping that cause harm to the environment and living beings. Previous studies have shown that jute and jute-derived composites are excellent sound-absorbing fibrous materials. The recent study also shows that the inclusion of granular particles like crumb rubber in the fiber enhances sound absorption. Fibrogranular material of natural and recycled material is an alternative to synthetic material. This study aims to characterize the effect of granular material, i.e., crumb rubber with the jute fiber, to understand the effect of granular particles on the jute fiber for sound absorption and the structural damping properties. Further, the size of crumb rubber is varied to understand its effect on the sound-absorbing and structural damping properties. The impedance tube transfer function method is used to measure the acoustic properties for normal incidence of sound. Then the measured acoustic properties are used to inverse characterize using the classical porous material model to evaluate the non-acoustic parameters, which is further used to characterize the structural damping properties based on the existing methodologies. The study discusses the sound absorption and structural damping properties of jute and crumb rubber fibrogranular composite