Ensure the security of your HCL environment by applying the Zero Trust princi...
Noise control
1.
2. NOISE CONTROLNOISE CONTROL
AT SOURCE,AT SOURCE,
ALONG PATH,ALONG PATH,
AT RECEIVERAT RECEIVER
SUBMITTED TO:-SUBMITTED TO:- SUBMITTED BY:-SUBMITTED BY:-
ER. DHEERAJ SONIER. DHEERAJ SONI YASHWANT RAJYASHWANT RAJ
VERMAVERMA
(MECHANICAL)(MECHANICAL)
3. INTRODUCTIONINTRODUCTION
Noise is unwanted sound. It can cause
hearing loss, disturb verbal communication or
cause nuisance. The most common sources
are industrial noise and traffic. Vibrations can
cause damage to assets, radiate noise or
cause discomfort to people.
Noise control or noise mitigation is a set of
strategies to reduce noise pollution or to
reduce the impact of that noise, whether
outdoors or indoors.
6. HOW CAN WE CONTROLHOW CAN WE CONTROL
NOISE?NOISE?
Control the source.
Block the path.
Enclose the receiver.
7. WHY NOISE AT SOURCE?WHY NOISE AT SOURCE?
Mechanical shock between two machine
parts.
Friction between two machine parts.
Unbalance rotating and reciprocating parts.
Vibration of large parts.
Loose fitting.
Irregular fluid flow.
Improper maintenance.
8. Vibration damping:- Applicable for large
vibrating surfaces. The damping mechanism
works by extracting the vibration energy
from the thin sheet and dissipating it as heat.
A common material is sound deadened steel.
Vibration isolation:- Reverts transmission
of vibration energy from a source to a
receiver by introducing a flexible element or
a physical break. Common vibration isolators
are springs, rubber mounts, cork etc.
HOW CAN WE CONTROLHOW CAN WE CONTROL
NOISE AT SOURCE?NOISE AT SOURCE?
9. Judicious sitting of the mechanical equipment.
Proper maintenance.
Proper material of machine part (For
example:-nylon gears can be used instead of
metal gears.).
Choice of low noise mechanical equipment.
10. BY RESILIENT SCREENBY RESILIENT SCREEN
DECKINGDECKING
The use of resilient
screen decking
reduces the impact
of rock on metal
12. Noise insulator:- Prevent the transmission of
noise by the introduction of a mass barrier.
Common materials have high-density properties
such as brick, thick glass, concrete, metal etc.
Noise absorber:- A porous material which
acts as a ‘noise sponge’ by converting the sound
energy into heat within the material. Common
sound absorption materials include decoupled
lead-based tiles, open cell foams and fiberglass.
HOW CAN WE CONTROLHOW CAN WE CONTROL
NOISE ALONG PATH?NOISE ALONG PATH?
16. VINYL STRIP CURTAINS can be used TO
SEPARATE AREAS OF PLANTS AND MILLS.
THE STRIPS NEED TO HAVE A 30 TO 50 %
OVERLAP.
IN SOME CASES THESE STRIPS MAY NEED
TO BE DOUBLES
19. Use head sets and ear plugs in industry.
Doors and windows should be well sealed.
Ventilation opening should be provided with
acoustic attenuators.
Internal surface should be made of absorptive
materials.
Innovative building design may be used to prevent
or reduce the intrusion of noise. For example, no
window openings facing noise source.
HOW CAN WE CONTROLHOW CAN WE CONTROL
NOISE AT RECEIVER?NOISE AT RECEIVER?
THERE ARE MANY TYPES OF VIBRATION ISOLATION MOUNTS. THE TOP TWO ARE VERSIONS OF AIR BAGS, WHILE THE BOTTOM USE SPECIAL RUBBER COMPOUNDS TO PREVENT METAL TO METAL FRICTION THESE MOUNTS SHOULD BE SELECTED FOR EACH SPECIFIC APPLICATION THE PURPOSE OF EITHER TYPE IS TO DE-COUPLE VIBRATING MACHINERY FROM THE BUILDING. THE RESULT IS A SIGNIFICANT REDUCTION IN STRUCTURE BORNE NOISE
THE CONCEPT OF PLACING A BARRIER ADJACENT TO A NOISE SOURCE (e.g. A MILL, A CRUSHER, OR A SCREEN) IS TO ESTABLISH AN ACOUSTICAL SHADOW ZONE WHERE THE NOISE LEVELS ARE SIGNIFICANTLY LOWER). THIS AREA MAY BE THE LOCATION OF A WORK STATION OR A PART OF THE PLANT THAT IS FREQUENTLY TRAVELED
ONE METHOD OF BLOCKING THE AIRBORNE PATH OF SOUND IS TO BUILD A WALL SEPARATING AREAS OF THE PLANT. SEVERAL STYLES OF CONCRETE BLOCK ARE AVAILABLE THAT NOT ONLY ACT AS A BARRIER BUT ALSO HAVE OPENINGS TO ALLOW THE SOUND TO ENTER THE CAVITY OF THE BLOCKS AND BE ABSORBED BY MINERAL WOOL OR FIBERGLASS.
THE USE OF VINYL STRIP CURTAINS TO SEPARATE AREAS OF PLANTS AND MILLS ARE VERY COMMON. IT IS IMPORTANT TO REMEMBER THAT TO BE EFFECTIVE THE STRIPS NEED TO HAVE A 30 TO 50 % OVERLAP. IN SOME CASES THESE STRIPS MAY NEED TO BE DOUBLES
THEY ALSO NEED TO BE OF SUFFICIENT SIZE, ENVIRONMENTALLY CONTROLLED AND STRUCTURALLY ISOLATED IF NECESSARY