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Mechanical Sound and Vibration
Mechanical sound is a disturbance of mechanical energy that propagates through matter as a wave. It is characterized by the properties of sound waves which are frequency, wavelenght, period, amplitutde and speed. In engineering it includes low and high frequency vibrations in air that cannot be heard and vibrations that travel through all forms of matter, gases, liquids and solids.
Noise harmful to human hearing sense may be controlled by products ranging from earplugs to wall panels. There are two types of noise: airborne and structure borne. Examples of engineered noise control products and systems are anechoic chambers, sound absorbers, silencers, barrier walls, kinetics accoustical wall and ceiling panels, and accoustical diffusers. There are companies that provide accoustic engineering services solving noise and vibration related problems for different environments.
Seismic restraint hardware and seismic related vibration isolators require the consideration of four aspects of the system:
-attachment of the equipment to the restrraint
-restraint design
-attachment of restraint to the building structure
-equipment fragility
Attachment of the equipment to the restraint must be strong. For restraint design kinetics offers a wide variety of restraints. Attachment of restraint to the building structure may be done via bolts, welds or concrete anchors.The fourth aspect refers to the ability of the equipment to continue to operate after being subjected to seismic force.
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