Coconut is one of the most important harvests in Malaysia. Industrial prepared coir fiber is
obtained from coconut husk combined with latex and other additives to enhance its structural …

The traditional Micro-perforated plate (MPP) is a kind of clean and non-polluting absorption
structure in the middle and high frequency and has been widely used in the field of noise …

Deep back cavities are usually required for micro-perforated panel (MPP) constructions to
achieve good low frequency absorption. To overcome the problem, a close-box loudspeaker …

Novel acoustic absorbers were fabricated by the compression and microperforation of the
porous metal, which aimed to develop practical acoustic absorbers for the noise reduction …

A membrane absorber usually requires a large back cavity to achieve low-frequency sound
absorption. This paper describes the design of a membrane acoustic metamaterial absorber …

So far the electro-acoustical equivalent circuit analysis has been widely used to analyse
micro-perforated panel (MPP) absorbers, however, as for the double-leaf MPP the …

A theoretical model to predict the sound absorption of lightweight multilayer curtains is
presented. The fabric sheets of the curtain are represented by a network of discrete …

The underwater anechoic coating technology, which considers pressure resistance and low-
frequency broadband sound absorption, has become a research hotspot in underwater …

ABSTRACT Problem Statement: The high level noise is harmful for all people especially in
heavy factories. In accordance with ear human biodynamic response, health damages of …

This chapter introduces the principles of sound absorbers and the factors that affect acoustic
absorption. The basic wave phenomena related to sound propagation such as acoustic …