ACOUSTICS

SOUND INSULATION

SUBMITTED TO :

AR. MANITA SAXENA

SUBMITTED BY :

NISHMA VASWANIPRAKOOL SONIRAVINA JAINROUNAK KHANDELWALSHUBHI AGRAWALUTKARSH TAGADE

INTRODUCTION- SOUND INSULATION

•Sound insulation is the process of soundproofing in an enclosed space, such as a room.

•This type of insulating activity is usually employed when there is a need to keep sound from filtering into or out of the space.

• This is used to indicate the reduction in the level of sound when it passes through a building component.

WHAT IS SOUND INSULATION

•Sound insulation techniques are often used in business settings, as well as in multi-family dwellings like duplexes and apartment buildings. For example -

• In a recording studio , in order to prevent background noise from interfering with the recording process , singers and musicians create their vocal and instrumental tracks in soundproof recording booth.

• In living space, sound insulation normally involves the installation of insulation in walls, under floors and above ceilings. This can be especially important in apartment buildings so that all the residents enjoy a measure of peace and quiet, even when others in the building are playing music or having a party.

• Conference rooms are often treated to a sound insulation treatment, ensuring discussions taking place within that space are not overheard by others in the immediate vicinity.

PROCESS OF SOUND INSULATION

•The actual process of sound insulation involves inserting some type of insulating material into the walls, as well as above the ceiling and below the floor.

• In some cases, this involves the use of rolls of fiberglass insulation or introducing foam insulation into the open spaces.

•There are also prefabricated panels that can be attached to walls and ceilings when there is no room for using other forms of insulating materials.

•Along with helping to insulate a space from noise, sound insulation also helps to make it easier to keep the temperature of the room at a comfortable level .

METHODS OF SOUND INSULATION

THE METHOD OF SOUND INSULATION WILL DEPEND ON THE TYPE OF NOISE TO BE TREATED AND THE DEGREE OF SOUND INSULATION REQUIRED.

THE THREE MAIN CATEGORIES ARE:-

1. WHEN SOURCE OF NOISE IS IN THE ROOM ITSELF.

2. WHEN NOISE IS AIR-BORNE.

3. WHEN NOISE IS STRUCTURE-BORNE.

1) WHEN SOURCE OF NOISE IS IN THE ROOM ITSELF

IMPROVEMENT IN WORKING METHODS:

SUPPRESS THE NOISE AT THE SOURCE ITSELF.WELDING MAY BE PREFERRED TO RIVETING.THE MACHINES WHICH ARE RESPONSIBLE FOR NOISE,SHOULD

CREATE THE LEAST POSSIBLE NOISE

• ACOUSTICAL TREATMENT:

THE WALL,FLOORS AND CEILINGS SHOULD BE PROVIDED WITH SOUND ABSORBING MATERIALS.

THE SOUND ABSORBING MATERIALS SHOULD BE MOUNTED ON THE SURFACE NEAR THE SOURCE OF NOISE.

• PERSONAL PROTECTIVE DEVICES:

IT IS POSSIBLE TO REDUCE THE NOISE TO THE EXTENT OF 20 TO 30 db BY USING PERSONAL PROTECTIVE DEVICES SUCH AS EAR PLUGS,HEADPHONES etc.

2. WHEN NOISE IS AIR-BORNE:

• SOLID NON-POROUS HOMOGENEOUS PARTITION:

PROVISION OF SOLID NON-POROUS HOMOGENEOUS PARTITIONS WILL REDUCE AIR-BORNE NOISE.

TRANSMISSION LOSS OF PARTITION DEPENDS DIRECTLY ON THE WEIGHT OF PARTITION PER UNIT AREA.

SOLID NON-POROUS HOMOGENEOUS PARTITIONS IS EXPENSIVE IN QUANTITY OF MATERIAL.

• PARTITIONS OF POROUS MATERIALS:

IT MAY BE RIGID OR FLEXIBLE.FOR RIGID POROUS MATERIALS SUCH AS CONCRETE

MASONARY,THE SOUND INSULATION INCREASES ABOUT 10 PER CENT DUE TO ABSORPTIVE PROPERTY OF THE MATERIAL.

FOR FLEXIBLE POROUS MATERIALS SUCH A WOOL , QUILT , etc.

DO NOT GIVE ENOUGH SOUND INSULATION.

MATERIALS FOR ACOUSTIC TREATMENT- GLASS WOOL AND GYPSUM BOARD

Glass wool with foam on wall Gypsum boards casted on aluminium panels

Glasswool partition batts are manufactured by spinning molten glass, containing up to 80% recycled content, into fine wool like fibres. The inorganic fibres are bonded together using a thermosetting resin. The product can be identified by its golden appearance.1.Customized sizes available 2.Significantly reduces echo 3.Excellent noise reduction..

Gypsum boards casted on panels

Cross section of gypsum board

Perforations on gypsum board

Glass wool on rear side of board

•Acoustic Ceiling Board : (GYPSUM)1.No radiation 2.Fire-proofing and fire resistance 3.High-strength 4.Moisture-proof...Type: Acoustic Panels

FIBERGLASS INSULATION AND ITS TYPEs

Fiberglass (or fiber glass)—which consists of extremely fine glass fibers—is one of the most commonly used insulation materials. It's used in different insulation forms: blanket (batts and rolls) , loose-fill and rigid fibrous .