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In the current era of industrial advancement, noise control is an issue for everyone in general and specific to the people working in industries. One of the best choices are to opt for an acoustic absorber which is cheap, reliable and affordable. Sound absorbers can be prepared artificially, like melamine foam, polyester etc., which are in general expensive or may be obtained from naturally occurring substances like coir. Artificial sound absorbers have disadvantages like injurious to health and are not environment-friendly whereas on the other hand natural sound absorbers are low cost, environment-friendly, and even easily available. Sound absorbers are porous materials which help to reduce the sound by decreasing sound energy, the vibration of air molecules produces heat which gets dissipated in the absorber. In line with this, present research focuses to use coconut coir felt for same. In this paper, acoustic impedance has been estimated. Bulk properties like the complex wave number and the normal characteristic impedance are found by using various analytical models such as Delany-Bazley, Garia and Pompoli, Miki, Attala-Sgard and Johnson-Champoux-Allard(JCA). The benchmarking has been done with melamine foam initially. Subsequently, the coconut coir felts have been investigated to estimate acoustic absorption coefficient. First, the acoustic modeling of two different types of coconut coir felts has been carried following an experimental investigation. The experimental investigations agree to model result adequately. Next, the samples have been investigated in estimating acoustic transmission loss. At last the samples have been tested by backed with perforated and slotted plates from a real-time implementation point of view. The 1D modeling has been done for such multilayers using transfer matrix method. The experimental investigations reveal that the proposed acoustic modeling technique can be reckoned as designing building acoustics liners from an industrial perspective.
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