Foam to reduce resonance
Foam to reduce resonance
(OP)
I recently took a course in Random Vibration and Shock Testing with Wayne Tustin.
He presented several photos of engineers filling fixtures and head expanders with foam to reduce resonance.
Has anyone tried this?
Thanks!
He presented several photos of engineers filling fixtures and head expanders with foam to reduce resonance.
Has anyone tried this?
Thanks!





RE: Foam to reduce resonance
RE: Foam to reduce resonance
Cheers
Greg Locock
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RE: Foam to reduce resonance
If it isn't bonded to the structure, I would agree with Greg's local panel mode. If it is bonded, I would think it might turn the structure into a sandwich composite unless the cavity is particularly large...then I think you are back to the local panel mode.
RE: Foam to reduce resonance
All of our head expanders are filled with some kind of expanding foam as delivered by the fixture company that specializes in vibration fixtures (Baughn Engineering). All head expanders that I've seen are made of magnesium. Our head expanders use ~2" thick mag plate for a horizontal surface with ~2" thick ribs to stiffen. The foam is injected between these ribs.