Resonance Fixture. Crazy Idea?
Resonance Fixture. Crazy Idea?
(OP)
We have a spec for a sine dwell on a project that I am working on. The level is higher than we can do at our local test facility which is where we would prefer to test. So my question is... Is it unheard of to design a fixture that will resonate at or near the test frequency so that you can push the table at a percentage of the required input and still fully test the part? Or are there just too many risks associated with doing a test this way? I attached a rough sketch of the idea.





RE: Resonance Fixture. Crazy Idea?
Incidentally it may not be as easy as you think to get that effect, over a braod frequency range.
Cheers
Greg Locock
New here? Try reading these, they might help FAQ731-376: Eng-Tips.com Forum Policies http://eng-tips.com/market.cfm?
RE: Resonance Fixture. Crazy Idea?
TTFN
FAQ731-376: Eng-Tips.com Forum Policies
Chinese prisoner wins Nobel Peace Prize
RE: Resonance Fixture. Crazy Idea?
RE: Resonance Fixture. Crazy Idea?
Cheers
Greg Locock
New here? Try reading these, they might help FAQ731-376: Eng-Tips.com Forum Policies http://eng-tips.com/market.cfm?
RE: Resonance Fixture. Crazy Idea?
I have design such a fixture way back but we call it mechanical signal amplifier. The main reason is to increase the signal that the DUT is experiencing. The material for the fixture and the way to control the gain take more work in the analysis side. Good knowledge of damping coefficient for material is very important as well as shape of elastomer to control the gain on a particular bandwidth. Resonance can be change by change the damper resonance (made of elastomer with or without fluid).
This type of fixture has been done and can also be qualified as a standard test fixture for a given DUT mass.
Good luck in your endeavor.