Jet Pulse Filter Systems
 Dust Collectors
 Flue Gas Purification Systems
 Restaurant Type Gas Cleaners
 Noise Insulation Systems
 Ventilation Systems
 Industrial Fans
 Filters For Digital Printers
 Accessories




 Samer Mohammed TRDG.EST. S. Arabistan
 Flue Gas Purification Systems
Puratos Food - Jet Pulse Filter
Ferro Foundry - Jet Pulse Filter
Tubitak - Jet Pulse Filter

 
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SOUND INSULATION SYSTEMS


SOUND CONCEPTI

Sound is the effect of pressure wave travelling at 344 m/s speed (at 20 °C) between air layers.
Density of sound wave is measured by watt (watt/m² surface area) which is a power unit.
Summation of sounds with different densities heared at human air is not total density of all those.
Human ear is prone to be saturated with sounds at different densities.

                                 SOUND POLLUTION (NOISE)
The lowest sound level can be heared by human is 10-12 W/m².

This phenomenon can be explained as follows:
Sounds at human ear are summed logarithmically more than linear.
Unit "Bel" is developed to measure the sound level depending on this fact. but since it is not best suits for practical
usage, sound level is stated as "Decibel" actually which expresses pW/m² value as exponents of 10.

Although sound pressure measurement is performed by full spectrum analyse, sometimes, it is needed to determine
a particular noise by measurement of sound pressure within a specific frequency range.

As summary, four main characteristic of sound wave are:
- Sound pressure is amplitude or magnitude of the sound.
- Sound gap is determined by the fluctuations in frequency of pressure wave.
- Sound waves are diffused away from the source
- Sound pressure decreases by the distance from the source.

Some equipments used in noise control:
- Vibration absorbers.
- Sound absorbing link accessories.
- Sound absorbing booths.

Example calculations:

Example 1:
Total noise level is 90,4 dBA when two machines with noise levels of 80 dBA and 90 dBA operates at the same time.

Example 2:
If a machine raises the noise level to 85 dBA from 80 dBA background, the specific noise of this machine is
calculated as 83,4 dBA.

Sound Density Typical Noises
pW/m2 dBA
1.000.000.000.000 120 Jet engine
100.000.000.000 110  
10.000.000.000 100 Workshop
1.000.000.000 90  
100.000.000 80 Laboratory
10.000.000 70  
1.000.000 60 Office
100.000 50  
10.000 40 Quiet room
1.000 30  
1.000 20 Silent night
10 10  
1 0 Audible limit