Scroll To Top

Megasorber 4-Fold Approach® — vibration damping

Megasorber® Damping materials effectively dissipate Vibration energy

Vibration damping is one of the most cost effective ways to reduce low frequency structure-borne noise. Free-layer and constrained-layer are the two most frequently used damping treatments.

In simple terms, vibration damping is similar to a suspension system in a car. It consists of a spring and a shock absorber.

Conventional damping materials are usually very heavy and are applied to the substrate as a free-layer. These materials are frequently referred to as 'mass-dampers'.

These mass-dampers are like the suspension system without the shock absorber. By adding weight to the system, it makes it harder to initiate the vibration. However, vibration energy remains in the system

Megasorber damping materials are engineered to be the "shock absorber" of the suspension system and remove the vibration energy from the system effectively.

FREE LAYER

vibration damping free layer

Material deformation: extension & compression

Free-Layer Vibration Damping Products

The damping material must have high internal loss factor, and it can not be too soft nor too rigid. It is a challenge to balance the requirements of high loss factor and the modulus of the material. The following materials have been designed to have both optimized modulus and a high loss factor:

CONSTRAINED LAYER

vibration damping constrained layer

Material deformation: shear

Constrained-Layer Vibration Damping Product

The damping material must be extremely viscous and soft. The loss factor of the material could be as high as 1.0. The following products all have a unique damping layer which is self-adhesive with high loss factor up to 1.0 :

 

Hear how Megasorber damping materials effectively reduce impact vibration noise:

Megasorber DT2S on 5mm Steel Plate
(Impact Noise Reduction)

 

Megasorber DT2A on 12mm Aluminum plate
(Impact Noise Reduction
)

 

How is the performance of damping materials rated?

(1) System loss factor: is the total loss factor of a substrate after the damping treatment. It is measured as per ASTM E756-98:  Standard Test Method for Measuring Vibration-Damping Properties of Materials.

(2) Decay rate (dB per second): is how fast the vibration decays. It is measured as per AS1937.10-1977:  Determination of Damping Coefficient by The Thick Plate Method.

How is System Loss Factor related to the total noise reduction in dB(A)?

A system loss factor of 0.1 is equivalent to a noise reduction of 20 dB(A) for a large and freely suspended panel.

With Megasorber system loss factor calculation program, we ensure that the system loss factor is 0.10 as a minimum for a damping treatment on various substrates such as steel, aluminium, plastic and so on.

What is the typical noise reduction in dB(A) after the damping treatment?

Typical noise reduction is between 8dB(A) to 15 dB(A) depending on the applications.

For example:

(1) Rain drop impact noise reduction of metal roofing: the typical noise reduction is 8 to 12 dB(A). Read more about "Rain Drop Impact Noise Reduction for Deaken University Performance Centre".

(2) Impact noise reduction for thick metal plate (12mm thick): a typical noise reduction of 15 dB(A) was achieved. Read more about "Impact Noise Reduction for Steel Wheel".

Is it possible to achieve high sound transmission loss as well as high vibration dampening?

This can be achieved with (1) specially formulated damping material with high loss factor and mass and (2) 100% coverage of the substrate. Megasorber D10 and D20 products are specifically formulated to provide high vibration damping as well as high sound transmission loss.