Browsing all articles tagged with Damper
Aug
20

Generator Sound Enclosure Guaranteeing Healthy Hearing

Aside from being weather –protective, generator sound enclosure, made of sound materials is known to offer sound solutions, facilitating simultaneously free air flow for cooling and combustion. Techniques adopted for achieving this are many, the underlying basic requirements being cost-effectiveness and effective sound control.

Sound:

While running generator is purposeful, the sound it generates is not. Generally, engine noise level is 110dB, quite unbearable to ears. It is most annoying, awesome and most-disturbing to the extent of other works not being able to be attended to. In this, no better choice could be there than utilizing the Generator Enclosure itself with some modifications and additions to control sound.

Imperatives:

A sound proof enclosure is to keep the deadening sound low, if not nil, without affecting generator’s operation. Cost of this also should be needlessly low.

Generator EnclosureConstruction:

A generator sound enclosure is generally constructed of steel or aluminium, most suitable for coastal areas also to combat corrosion. Most important, carpet, a sound proofing material is used  inside for sound proofing and noise insulation. Steel gauge used is 12 or 14 gauge with non-hydroscopic (water-resistant) insulation with other features like lockable doors for access and protection, valves for control of oil and coolant drains, and rodent barriers.

Fuel tank and base duly assembled, louvers for air flow, emergency stop button, cambered roof to prevent water accumulation, exhaust system for safety are the other constructional features of a Generator enclosure. Enclosure comes in different sizes and designs suitable for generators from 10-1000 KW together with sound control.

Materials used:

Materials used for sound control are compact and light-weight. Glasswool or rockwool initially used for sound proofing were later abandoned due to their corrosive nature, giving way for acoustic foam with fire-proof sound absorbing facing and self-adhesive backing  no welding or riveting of any metal sheet. This resulted in increased factory output and low labor cost.

Causes :

Cumulative sound caused in the enclosure is by vibrations in mounting, different parts of enclosure, and due to running of generator. All are to be contained by adopting suitable correctives.

Cures:

Vibration is damped by using self-adhesive vibration damping sheets, while sound damping is achieved by using acoustic foam with fireproof sound absorbing facing and self-adhesive backing.

For lower noise level requirements, thicker foam is recommended. With stronger fireproof acoustic facing, use of appropriate thickness foam is ideal for sound absorption at low frequency levels.

Types followed:

Various sound proofing methods are adopted depending upon budget and need.

a)    Economical sound –proofing system- this is a line enclosure with a self-adhesive layer damper.

b)    Compact sound proofing system is done by applying the self-adhesive layer with varying thicknesses to cover about 60% of the area.

c)    Super quiet system: Here, lining the enclosure is done using different types of 500 mm thick sound proofing foam composite material with fireproof acoustic proofing,

Basic sound absorption technique:

This absorbs both air-borne noise and low-frequency structure –borne noise using 1.5 mm thick self-adhesive constrained layer damper.

General:

For high-capacity generators used in hospitals, libraries and other establishments, combined efforts for generator sound enclosure as well as for generator room are taken using sound absorbing polyester wool with fireproof acoustic facing, adhesive damper, splitters, and plastic pins on wall panels.

Machines Generator Enclosure

Share