Noise Control Manual: Guidelines for Problem-Solving in the by David A. Harris (auth.), David A. Harris (eds.)

By David A. Harris (auth.), David A. Harris (eds.)

Excessive noise degrees are normally stated to have antagonistic results on the environment. reports point out that over the top noise degrees may cause fatigue in uncovered members, reduce potency and productiveness, impaired speech communique, and listening to loss. over the top noise is sort of far and wide at the present time - within the workplace, in faculties, hospitals and different institutional amenities, in all sessions of public structures, and in our factories. commercial NOISE excessive noise degrees in factories could make speech verbal exchange within the plant tricky and every now and then most unlikely. Foremen are usually not able to listen to caution shouts from co-workers. the matter of listening to loss because of over the top noise publicity is of specific main issue to undefined, and to the government. within the early Seventies, the USA Congress handed the Occupational safeguard and future health Act (OSHA) which units standards for overall healthiness dangers and tested limits for noise publicity of business employees. The OSHA Noise usual used to be amended in 1982 to require audiometric trying out of all staff uncovered to noise degrees of eighty five dB or above for 8 hours. A NOISE IN advertisement AND INSTITUTIONAL constructions whereas noise degrees in workplaces, shops, colleges, and different advertisement and institutional structures seldom succeed in these encountered in lots of commercial environments, they typically succeed in degrees that are distracting to the occupants of such structures. Impairment of speech communica­ tion between staff, or inversely the inability of speech privateness, are either deterrents to potency and productiveness and are damaging to the occupants' convenience and experience of well-being.

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Extra info for Noise Control Manual: Guidelines for Problem-Solving in the Industrial / Commercial Acoustical Environment

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5. Types of Treatment The two major types of damping are free layer and constrained layer, and some materials could be considered a combination of both. The free layer treatment consists of a single layer of viscoelastic material applied to the base structure, and the bending vibration of the base material induces extensional deformation of the viscoelastic layer. The constrained layer treatment could consist of either two layers of material added to the existing structure: a layer of viscoelastic material, and a layer of relatively stiff material, usually sheet metal, or it could consist of the structural material itself with the viscoelastic material sandwiched between two layers of sheet metal.

Chapter 4 - VIBRATION DAMPING MATERIALS DAMPING VIBRATIONS The dynamic resonances and sound barrier properties of a structure are governed primarily by mass, stiffness, and damping. Mass and stiffness were discussed in Chapter 3. Damping is perhaps the most unpredictable and complex property. The word "damping" has been used loosely for many years to denote any number of noise abatement procedures. Frequently used, almost self contradictory phrases such as "damp out the sound in the room" and "use sound damping mounts under the machine" indicate the state of popular confusion among the mechanisms of vibration damping, sound absorption, and vibration isolation.

Frequency, Hz Other materials used as structural components as well as sound barriers include metals, wood, fibrous and cementious boards, glass, stone, and many common artificial materials and composites such as paperboard, vinyl, fiberglass reinforced plastic (FRP), rigid foam (closed cell), roofing, wall coverings, and floor coverings. Some products used as sound absorbers 28 NOISE CONlROL MANUAL such as slotted concrete blocks and perforated clay tiles have some barrier capability in addition to their role as sound absorbers.

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