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RE: "Well, I tried mass-loading" ...

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geoffkait

M

In Reply to: RE: "Well, I tried mass-loading" ... posted by andyr on June 07, 2022 at 04:19:30

Just to point out that's not mass loading, what you tried. Mass loading requires mass to be located above the object that's vibrating. Increasing the total load (weight). F=ma, the load is in the direction of the force of gravity, vertical. An example of mass loading is placing a heavy slab of granite on top of a speaker cabinet. Or placing a heavy glass weight on top of a preamp. What you did wasn't really damping either, for effective damping you need viscoelastic material or some constrained layer type dampener.

Edits: 06/08/22 06/08/22 06/08/22

Follow Ups:

RE: "Well, I tried mass-loading" ... - andyr 15:00:08 06/08/22 (1)
Whilst I can understand that " placing a heavy slab of granite on top of a speaker cabinet " certainly is a form of 'mass-loading' ... I can't see why increasing the mass of the U-frames (from 1.7kg to 2.5kg) isn't also 'mass-loading'.

And a 'CLD' structure is "heavy-light-heavy" etc - so my use of thin foam tape with glue on each side meets this criterion. But, sure ... maybe I could've used a better (viscoelastic) material for the 'light' layer.

Andy
- Definition of terms - geoffkait 08:20:18 06/09/22 (0)
  Mass
  Mass is a measure of the amount of material in an object, directly related to the number and type of atoms present in the object. Mass does not change with a body's position, movement or alteration of its shape unless material is added or removed. The unit of mass in the SI system is the kilogram (kg).
  
  Weight
  In the trading of goods, weight is taken to mean the same as mass and is measured in kilograms. Scientifically, however, it is normal to state that the weight of a body is the gravitational force acting on it and hence it should be measured in newtons (N), and that this force depends on the local force due to gravity. To add to the confusion, a weight is an artefact of calibrated mass normally made from a dense metal. So, unfortunately, weight has three meanings and care should always be taken to appreciate which one is meant in a particular context.
  
  Force
  Force is a measure of the interaction between bodies. It takes a number of forms including short-range atomic forces, electromagnetic and gravitational forces. Force is known as a vector quantity, as it has both direction and magnitude.
  
  Load
  Load is a term frequently used in engineering to mean the force exerted on a surface or body.
  
  I would say what you did was close to constrained layer damping, but not mass loading. In the case of constrained layer damping one would use a stiff layer like metal with a viscoelastic layer. Vibration is reduced by absorbing it as shear forces in the video layer.

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