Soft foam damping between Elec. Boards under shock
Soft foam damping between Elec. Boards under shock
(OP)
I am looking for a good (cheap/dirty) way to dampen electronics boards in a very space limited enclosure under high shock. I was hoping to find a COTS foam tape (~.15 and ~.25 thk) that I could stick between the boards in certain places to prevent high frequency vibration.
Anyone know of a foam/material I can stuff between the boards? Oh, and it can't particulate....
Any other thoughts are welcome also.
Anyone know of a foam/material I can stuff between the boards? Oh, and it can't particulate....
Any other thoughts are welcome also.





RE: Soft foam damping between Elec. Boards under shock
RE: Soft foam damping between Elec. Boards under shock
Eng-Tips: Help for your job, not for your homework Read FAQ731-376
RE: Soft foam damping between Elec. Boards under shock
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RE: Soft foam damping between Elec. Boards under shock
http://www.mcmaster.com
RE: Soft foam damping between Elec. Boards under shock
Mike Halloran
Pembroke Pines, FL, USA
RE: Soft foam damping between Elec. Boards under shock
Use an electronics rated silicon which does not generate ascetic acid while self vulcanizing.
I think that is a good idea, by the way, as it can be separated but won't normally, and will fit any shape, and won't degrade, and can be right on the parts, and..
RE: Soft foam damping between Elec. Boards under shock
MikeH -- my thought is simply to provide some damping on some unsupported regions of the boards. The G levels are quite high at high frequencies (5-10kHz), and if I can attenuate those (keep the board from vibrating at that natural frequency, in those regions), I can handle the levels at the lower frequencies. I can't use more standoffs, because the EE guys insist they're at their limit for space and can't deal with another standoff. The assembly has to be servicble (can't use anything permanent).
RE: Soft foam damping between Elec. Boards under shock
Elastomeric dampers are too slow developing reaction force to help when the dynamite goes boom. The compression waves traveling through them may add some interesting dynamics of their own.
So, don't add standoffs. Substitute tension members, and put the components between the boards into compression. Use the boards to reinforce each other.
Or pot the box. Or pack it with sand.
Mike Halloran
Pembroke Pines, FL, USA
RE: Soft foam damping between Elec. Boards under shock
RE: Soft foam damping between Elec. Boards under shock
Again, thanks to everyone for the responses.
RE: Soft foam damping between Elec. Boards under shock
Wheels within wheels / In a spiral array
A pattern so grand / And complex
Time after time / We lose sight of the way
Our causes can't see / Their effects.
RE: Soft foam damping between Elec. Boards under shock