vibration damping

"Jeff Finlayson" arrogantly wrote: .. | Spaceman narrow-mindedly wrote: | > "jas" wrote: | >

| > | what is the best "vibration damping" engineering material. | >

| > The best vibration damping is done by balancing. | > (not a material, but a method of material use) | > If the balancing is correctly done, no other | > vibration damping is needed since no vibration | > will be occuring. | > :) | | There are plenty of dynamic events where balancing is | not an option. Impact loading, acoustic loading, etc.

I agree but simply not all vibrations come from such I did not say all vibrations can be eliminated by balance. I agreed some vibration are an occurance of a desired job of the part. Why do you think that is narrow-minded? (playing with your newsreader options?) It was actually not. :)

It largely read that way, but yes you didn't actually say all cases of vibration can be solved by balancing. Also, balancing process may not be perfect.

but my system is a balanced one i is present at place near to a vibration producing source and to avoid transfer of vibration to my system from it , what should i do?

but my system is a balanced one it is present at place near to a vibration producing source and to avoid transfer of vibration to my system from it , what should i do?

Actually there are a great many vibration problems that have nothing to do with balancing and that cannot be resolved in that way.

Examples are many and include:

1) internal combustion engine pulsations - these result in both torsional and lateral rotor vibrations. 2) electric motor excitations - these result primarily in torsional pulsations but also can excite lateral vibrational modes. 3) high speed gyroscopic excitations ... this is a stability problem. Ironically with various journal bearings the solution is often NOT to balance but to misalign the rotor to the stator ... interesting stabilizing effects can occur. 4) unbalance - Not always mass unbalance, stiffness unbalance can cause vibrations. Often this can be tuned out.

The only thing (and granted it is a big only) is reduce the excitation magnitude such that the resulting vibration is acceptable ... as a practical matter it cannot be eliminated entirely.