Damping_measurement
Damping_measurement
(OP)
Hi guys!
I have started my MSc on composites one month ago, and now I am looking for a testing setup in order to measure damping on some specimens. I have designed a jig in order to simulate free free vibration and using an impact hammer and LMS to get the damping coefficient. Do you know if there is an existing solution out there, any testing equipment according to any of these standards: ISO 6721-3, SAE J1637, astm e756??
Thank you guys!
Have a nice week!!
Best regards,
Fanis.
I have started my MSc on composites one month ago, and now I am looking for a testing setup in order to measure damping on some specimens. I have designed a jig in order to simulate free free vibration and using an impact hammer and LMS to get the damping coefficient. Do you know if there is an existing solution out there, any testing equipment according to any of these standards: ISO 6721-3, SAE J1637, astm e756??
Thank you guys!
Have a nice week!!
Best regards,
Fanis.





RE: Damping_measurement
I must admit, while I've seen a few proprietary rigs to measure this sort of thing, I wouldn't have thought there was much of a market. You could try contact vibration equipment manufacturers.
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: Damping_measurement
I suggest you do similar. It will also allow you to use various models and see which fits your data best later.
RE: Damping_measurement
It comes in many forms: intrinsic (i.e. of the material itself), structural effects, effects that derive from the supports and how the specimen is supported, the affects of the ambient fluids or conditions, amplitude dependent damping (i.e. linear vs non-linear) and so on
There are no self-contained measurements of damping, basically tap tests are most commonly used
RE: Damping_measurement
https://law.resource.org/pub/et/ibr/et.iso.16940.2...
RE: Damping_measurement
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: Damping_measurement
RE: Damping_measurement
RE: Damping_measurement
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: Damping_measurement
Thank you for your info!!!!!!
RE: Damping_measurement
So the best way for measuring the damping is the viscoalayser.
The main benefit of this method is that damping is obtained at every frequency instead of at just resonant frequencies.
Finaly, composite has a critical temperature where the damping increases strongly. There is a phase transition at this temperature.