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Engine noise is primarily determined by three parameters:
(a) Engine size
(b) Engine speed
(c) Engine load
Noise reduction in vehicles can be achieved by
1. Choice of engine design parameters
2. Control of noise due to combustion
3. Turbocharging (using the exhaust gases to rotate turbine that drives a compressor
to move more air into cars engine)
4. Cover design
5. Engine shielding and enclosure
6. Choice of proper tyres
Railway operations have been one of the major sources that need to be curbed.
The solutions include noise barriers at railway yards, railway station and populated area.
As per Civil Air Navigation Services Organisation (CANSO) and Airport Council
International (ACI) (2015), improvements and inversion have resulted in aircrafts
that are 55 decibel (dB) silent compared to models manufactured in the 1960s.
Machine enclosure with acoustic enclosures like diesel generator is widely used
to curb noise pollution. But the noise abatement in mining operation is challenging
as the noise nuisance is coupled with problem associated with vibration. The most
noise-producing equipment under the ground are the ventilators.
Air blast due to explosive energy inefficiency can cause structural damage around
the vicinity of operation. Noise, originated by airblast, becomes a social issue if
unregulated.
Factors associated with noise and airblast are as follows:
1. Improper blast geometry
2. Overcharging of blast holes
3. Poor stemming
4. Uncovered detonating cord
5. Variation of burden on blasting explosive at site
Blasting of explosives are linked to noise, fly rock and/or airblast. Improper
blasting operation will result in use of less than 25% explosive energy rock breaking
and rest contributing to shock waves resulting in noise, flying of rocks besides
vibration of ground structures. Atmospheric wind velocity, temperature, clouds/fogs
can cause reflection of explosion pressure wave reverse to the ground.
Blasting-related noise and vibration issues may be reduced by
(i) Firing maximum of two holes on the first and the subsequent delays
(ii) Selection of
(a) Burden and spacing of blastholes
7.2 Engineering Control
Engine noise is primarily determined by three parameters:
(a) Engine size
(b) Engine speed
(c) Engine load
Noise reduction in vehicles can be achieved by
1. Choice of engine design parameters
2. Control of noise due to combustion
3. Turbocharging (using the exhaust gases to rotate turbine that drives a compressor
to move more air into cars engine)
4. Cover design
5. Engine shielding and enclosure
6. Choice of proper tyres
Railway operations have been one of the major sources that need to be curbed.
The solutions include noise barriers at railway yards, railway station and populated area.
As per Civil Air Navigation Services Organisation (CANSO) and Airport Council
International (ACI) (2015), improvements and inversion have resulted in aircrafts
that are 55 decibel (dB) silent compared to models manufactured in the 1960s.
Machine enclosure with acoustic enclosures like diesel generator is widely used
to curb noise pollution. But the noise abatement in mining operation is challenging
as the noise nuisance is coupled with problem associated with vibration. The most
noise-producing equipment under the ground are the ventilators.
Air blast due to explosive energy inefficiency can cause structural damage around
the vicinity of operation. Noise, originated by airblast, becomes a social issue if
unregulated.
Factors associated with noise and airblast are as follows:
1. Improper blast geometry
2. Overcharging of blast holes
3. Poor stemming
4. Uncovered detonating cord
5. Variation of burden on blasting explosive at site
Blasting of explosives are linked to noise, fly rock and/or airblast. Improper
blasting operation will result in use of less than 25% explosive energy rock breaking
and rest contributing to shock waves resulting in noise, flying of rocks besides
vibration of ground structures. Atmospheric wind velocity, temperature, clouds/fogs
can cause reflection of explosion pressure wave reverse to the ground.
Blasting-related noise and vibration issues may be reduced by
(i) Firing maximum of two holes on the first and the subsequent delays
(ii) Selection of
(a) Burden and spacing of blastholes
7.2 Engineering Control