Question

Explain the properties of sound absorbing material and give its classification according to use with neat sketches.

Answer 1

1. The three main types of absorbers (porous absorbers, membrane absorbers and resonance absorbers) can be combined to obtain a predetermined reverberation time, one which is balanced in terms of the various frequencies.
2. Often it is enough to combine two types, for example a porous absorber and a membrane absorber.
3. It is very important to try and arrive at a reverberation time which is the same for the entire frequency range. Together with the shape of the room and how the sound absorbers are distributed, the balanced reverberation time is of critical importance for the overall acoustic comfort, which is the final goal.

Answer 2

Answer:

Sound-absorbing substances will absorb a maximum of the sound power that collides with them and could reflect very little. These traits cause them beneficial withinside the management of noise inside an area or enclosure. They are utilized in a whole lot of locations: near the supply of the noise, paths, or near receivers.

Types of Sound Absorbing Materials

1. Acoustic absorption is the method through which sound power is dissipated and converted into any other shape of power: warmth, mechanical, or deformation.
2. From a systematic standpoint, there are 3 number one kinds of sound absorbers: porous, membrane, and resonance.
3. A quantity of sound-absorbing substances exist. Their ability to absorb sound waves is distinctly depending on frequency, composition, thickness, and technique of mounting.

Porous Absorbers

• Porous sound absorbers are most effective for mid-variety frequencies or treble tones. They tend to have much less impact in the direction of decreased frequencies and feature minimum impact with bass.

• sound absorbent substances are not dense, they are permeable.

Cushions and Pillows

• Cushions and pillows are taken into consideration by porous sound absorbers. Their smooth surfaces and porous cloth can absorb soundwaves and flip them into warmth power. Generally speaking, the thicker they may be the greater sound you may absorb.

Carpets and Area Rugs

• Carpets and vicinity rugs can assist to absorb effect noise and prevent the transmission of sound through structures.

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