vibration damping – megasorber 4-fold approach (ABCD)
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. 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 effectively remove the vibration energy from the system.
how is the performance of damping materials rated?
1. System loss factor:
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):
How fast the vibration decays. It is measured as per AS1937.10-1977: Determination of Damping Coefficient by The Thick Plate Method.
how is the 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 the 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.
megasorber damping materials effectively dissipate vibration energy
free layer vibration damping
free layer vibration damping products
The damping material must have a high internal loss factor, and it can not be too soft nor too rigid. It is challenging to balance the requirements of the 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:
Megasorber LD5. Water-based liquid deadener
hear how megasorber damping materials effectively reduce impact vibration noise
constrained layer vibration damping
constrained layer vibration damping products
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 that is self-adhesive with a high loss factor up to 1.0.
Megasorber D14: Self-adhesive vibration damping sheet
Megasorber DT2: Self-adhesive vibration damping tiles
Megasorber DIS8: Self-adhesive isolation and damping sheet
what is the typical noise reduction in dB(A) after the damping treatment?
Typical noise reduction is between 10dB(A) to 18 dB(A), depending on the applications.
- Raindrop impact noise reduction of metal roofing: the typical noise reduction is 10 to 18 dB(A), depending on the roof construction.
- Impact noise reduction for thick metal plate (5mm steel plate and 12mm thick aluminium plate): a typical noise reduction of 13 to 15 dB(A) was achieved.
Is it possible to achieve high sound transmission loss and high vibration damping?
This can be achieved with:
- Specially formulated damping material with high loss factor and mass and
- 100% coverage of the substrate.