definitions
definitions
(OP)
Hi everybody there,
I'm really having a problem with the definition of:
eigenfrequency(ies)
eigenvector
vibrational mode
mode shape
modal energy
what the difference between the eigenfrequency and the resonant frequency? and in which case we refer to each one?
thanks in advanced :)
I'm really having a problem with the definition of:
eigenfrequency(ies)
eigenvector
vibrational mode
mode shape
modal energy
what the difference between the eigenfrequency and the resonant frequency? and in which case we refer to each one?
thanks in advanced :)





RE: definitions
"Eigenvector" is equivalent to "undamped normal mode shape" (with a similar caveat to that above)
Applied mathematicians tend to use Eigenfrequency/vector where engineers tend to use natural frequency and mode shape. They are called Eigenfrequencies/values/vectors because they are solutions to an Eigenvalue problem (look in a graduate maths text)
Modal energy is the energy stored in a mode!
Seems like you need to do some reading. "Modal testing: Theory and Practice" by DJ Ewins has a nice gentle introduction to this sort of thing.
M
--
Dr Michael F Platten
RE: definitions