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Adhesive Tapes Help Suppress Vibration Noise for Quieter Applications

Posted on 4/21/2021 7:36:54 AM By GlobalSpec 360
  

Manufacturers are increasingly turning to fabricated adhesive materials to assist in meeting the growing consumer demand for products with quieter operation and reduced levels of either airborne or structural noise.

Adding layers, barriers or absorbers using laminating adhesive can reduce the airborne noise created when vibrating surfaces interact with the air, by reflecting or absorbing the sound energy.

However, structural noise problems are more difficult. The only ways to control noise caused by mechanical vibration energy, which permeates the entire structure of a product and any other material it touches, is to control the vibrational energy itself by inserting a low friction surface between parts; isolating the vibration; or changing the structure’s vibration mode by constraining it and damping it.

In the manufacture of panels using two rigid surfaces, 3M reports that its very high bond adhesive tapes offer both a strong bond and a solution to unwanted noise caused by either of these two rigid surfaces, through working as a team with the surfaces. While bonding, the tape provides a strong visco-elastic layer between the two surfaces, which elongates in response to vibrations caused by either or both of the rigid surfaces. However, those same surfaces constrain the elongation with their rigidity, causing the tape to become a vibration dissipating damping material. According to 3M, the resulting constrained layer damping results in the diversion of the vibration energy into heat energy, so reducing the noise levels, but retaining the bond strength.

Another adhesive tape, vibration damping foil tape, takes a direct approach by supplying its own damping constraint. These tapes, which are applied to assembly parts that tend to vibrate, combine thick aluminium foil and soft polymeric damping adhesive material. The vibration force can still send the polymeric adhesive into elongation mode, but the foil provides constraint and brings about the same conversion of the vibration energy into heat energy.