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.

hMistiCundercoat

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 hMistiCundercoat

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.

DIY Battery Repair

DIY Battery Repair

You can now recondition your old batteries at home and bring them back to 100 percent of their working condition. This guide will enable you to revive All NiCd batteries regardless of brand and battery volt. It will give you the required information on how to re-energize and revive your NiCd batteries through the RVD process, charging method and charging guidelines.

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