Applying Damping Materials

Since a vibrating body or surface radiates noise, applying any material that reduces or restrains the vibrational motion of that body decreases its noise output. Three basic types of redress vibration damping materials are available:

Liquid mastics, which are applied with a spray gun and harden into relatively solid materials, the most common being automobile undercoating Pads of rubber, felt, plastic foam, leaded vinyls, adhesive tapes, or fibrous blankets, which are glued to the vibrating surface Sheet metal viscoelastic laminates or composites, which are bonded to the vibrating surface g should be two to three as the vibrating aximum effectiveness.

g should be two to three as the vibrating aximum effectiveness.

â– hMastiCundercoat

Vibrating Surface

Mastic Layer

Constraining Layer

For effective vibration damping, each layer should be about one-third as thick as the vibrating surface.

FIG. 6.6.9 Reducing vibration with damping materials.

Vibrating Surface

Vibrating Surface

â– hMastiCundercoat

Vibrating Surface

Mastic Layer

Constraining Layer

For effective vibration damping, each layer should be about one-third as thick as the vibrating surface.

FIG. 6.6.9 Reducing vibration with damping materials.

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