Some material having hard, rigid including non-porous surface, provide the least absorption, whereas these which are flexible, soil porous also can vibrate, absorb more extra sound
The efficiency about the sound absorption depends and upon the porosity of every material used essentially sound absorbent
The term used to express the percentage of the incident sound that can be absorbed by a material is known as the absorption coefficient of the material
If the absorption coefficient of a material is 0.75, mean that the material is capable of absorbing 75 % of the incident sound
Each absorption coefficient changes with the frequency of every incident sound
When sound waves strike that surface from a porous material, a part of the waves make reflected while a component enters the pores of the material including dissipated within heat energy
These efficiencies of this sort of absorbent increases with the increase in the resistance granted by the material
Some absorbent material is fixed toward sound framing timber with an air space between each framing including the wall near back.
Such an arrangement runs most efficient during absorbing sound waves at a base frequency
This principle of sound absorption is that sound waves of the appropriate frequency cause sympathetic vibrations in the panel which serves to be a diaphragm
Some absorption of sound uses place under the dampening of some sympathetic vibration.
It essentially consists of a chamber with a narrow opening (entrance) in which absorption takes place by the resonance of the air in the chamber which gives loss of sound energy
Such an arrangement container work effectively over a single picked frequency.
The range of holes in the panel should differ between 10 to 20 % of each total area of the panel.
When some sound strikes the panel, the sound waves pass through the holes also get damped through the resonance of the air in that cavity.
That effectiveness of that system can be increased by placing a porous material same mineral wood etc. in this cavity
This type of absorbent is commonly used, as it is easy to install, economical and it can accommodate a wide range of frequencies
Characteristics of audible sound
There are three characteristics of sound
Intensity & loudness
Frequency & pitch
Intensity & loudness
The intensity of sound is defined as the amount of flow of wave energy crossing per unit time through a unit area taken perpendicular to the direction of propagation.
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