Author/Authors :
mamtaz, h. school of engineering,taylor’s university,taylor s lakeside campus,no.1 jalan taylor s,subang jaya,selangor, Malaysia , fouladi, m.h. school of engineering,taylor’s university,taylor s lakeside campus,no.1 jalan taylor s,subang jaya,selangor, Malaysia , al-atabi, m. school of engineering,taylor’s university,taylor s lakeside campus,no.1 jalan taylor s,subang jaya,selangor, Malaysia
Abstract :
The theoretical explanation of the absorption phenomena of various porous materials was stated by many authors by proposing various models. The purpose of almost all the models was to estimate the materials acoustical parameters such as,characteristic impedance,surface acoustic impedance and wave propagation constant. The absorption behavior of any porous material can be capably derived from a viewpoint of materials physical realizability and their effect on acoustic absorption. In addition,a successful establishment of link between modified physical parameters and acoustical parameters of the material could play a significant role to promote its absorption mechanism. This study presented the review of various experimental and methodical methods which had been implemented to understand the absorption phenomena of various synthetic and natural fibers,relevance to the acoustics. The intension of this review was mainly for a potential exploration of an analytical method by over viewing various analytical and experimental studies on fibrous sound absorbing materials for acoustic absorption purpose. The study discussed the theoretical outcomes of Delany-Bazley and Biot-Allard models. The study also discussed the opportunities to improve the value of acoustic absorption coefficient at low frequency (below 1000 Hz) range through experimental and analytical studies,considering various physical properties of fibrous material and their reinforced composites. © School of Engineering,Taylor’s University.
Keywords :
Acoustic absorption , Delany , Bazley and Biot , Allard model
