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Acoustic. Vibration Damping
Vibrating surfaces push the air around them as they move up and create a partial vacuum that pulls the air back in as they move down. The effect of this is to create a pressure wave in the air, converting the structure borne vibration into air-borne noise.
Minimising how much a surface is able to vibrate by applying a dampening material to absorb the vibrating motion is known as vibration dampening and is one of the key techniques for noise control.
Vibrating surfaces generate noise like loud speakers.
A dampening material acts like a spring to 'absorb' some of the vibrations. This reduces the noise created by the vibrating surface.
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<i class="icon-chevron-right"> How does vibration dampening work?
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<p>Dampening materials work on a “mass-spring” principle. </p>
<p>Basically the dampening material will be a visco-elastic layer applied directly to the vibrating surface. As the surface vibrates out into the dampening material the dampening material contracts against its own weight so the vibration is minimised.</p>
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<i class="icon-chevron-right"> What materials are best for vibration dampening?
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<p>Visco-elastic materials that are capable of expanding and contracting are the best vibration dampening materials. </p>
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<i class="icon-chevron-right"> When should I use vibration dampening materials?
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<p>Vibration dampening materials have the biggest impact on large thin sheet metal surfaces - such as ductwork. Applying a dampening material in these cases can significantly reduce the noise emitted by the vibrations.</p>
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