In our modern era of rapid development, the issue of noise pollution has become increasingly pressing. This relentless surge in noise pollution has brought about significant adverse effects on human health, extending beyond just auditory concerns. To combat this escalating problem, it becomes imperative to explore innovative solutions, such as the utilization of natural fiber-reinforced composites in acoustical applications. These composites offer environmental friendliness, cost-effectiveness, and enhanced mechanical and sound-absorbing qualities. In the context of this review, we examine various methods for evaluating both the mechanical and acoustical attributes of these composites. We examine significant acoustical metrics, including the sound absorption coefficient, sound transmission losses, and noise reflection coefficient, as well as mechanical aspects encompassing tensile, flexural, impact strengths, and hardness. Moreover, this comprehensive review delves into the realm of influencing parameters, which exert a notable impact on the mechanical and acoustical characteristics of natural fiber-reinforced composites. A range of variables is encompassed by these influencing parameters, including fiber properties, binder-filler amount, specimen thickness, etc. It is worth noting that manipulating these parameters can yield significant enhancements in mechanical strength and sound absorption. However, it is crucial to recognize and respect certain limitations to avoid adverse effects. In conclusion, this review emphasizes the importance of carefully considering these performance-influencing parameters to optimize the mechanical and acoustical attributes of natural fiber-reinforced composites. By doing so, we can fully harness the potential of these composites to address the challenges posed by escalating noise pollution effectively.

Noise pollution is increasing in this era as countries' development is faster. This noise pollution causes serious non-auditory effects on human health. As a result, it needs effective controls on noise pollution. Hence, use a natural fibrereinforced composite for acoustical applications. Natural fibre-reinforced composites have various benefits, such as being eco-friendly, easy to manufacture, and effective in cost, and natural fibre improves the sound absorption, mechanical strength, and structural stability of the composite. The present review describes various techniques for measuring the acoustical and mechanical characteristics of natural fibre-reinforced composites. In addition to these acoustical (sound absorption coefficient, sound transmission losses, etc.) and mechanical (tensile, flexural, impact, etc.) characteristics are reviewed. Furthermore, this review paper studied an influencing parameter that affects the acoustical and mechanical characteristics of natural fibre-reinforced composites. these influencing parameters, such as fibre properties, density, porosity, sample thickness, binder amount, and filler material. In natural fibre-reinforced composites, increasing the percentage of the fibre density, binder amount, and filler material enhances sound absorption and mechanical strength, but these parameters have certain limitations, and crossing the limitation decreases the characteristics. reduce the porosity, decrease sound absorption, and increase sample thickness to increase acoustical characteristics. The conclusion states that the acoustical and mechanical characteristics of natural fibre-reinforced composites are enhanced when considering the performance-influencing parameters.