modal damping
modal damping
(OP)
Hello,
Can'I using a modal analysis determine the effect of friction on the modal damping value of a structure?
or I must apply a sinusoidal force and guettig the the damping value correspending to the modal frequency.
thx
Can'I using a modal analysis determine the effect of friction on the modal damping value of a structure?
or I must apply a sinusoidal force and guettig the the damping value correspending to the modal frequency.
thx





RE: modal damping
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: modal damping
So you need a formula between the two kind of damping...
Et voila!
ξfriction=(2η/π)2(1-ω2/ω02)2/(ω2/ω02[ω4/ω04-(4η/π)2])
RE: modal damping
eta is the modal damping?? can you submit please the document or the reference for this equation?
Cheers,
RE: modal damping
RE: modal damping
but in this book i didn't found this equation ξfriction
and the chapter 30 is about VIBRATION OF STRUCTURES INDUCED BY FLUID FLOW
RE: modal damping
The chapter 30 is "Theory of vibration isolation" and the equation is in the section "Rigidly connected coulomb damper"