Note: This discussion is about an older version of the COMSOL Multiphysics® software. The information provided may be out of date.
Discussion Closed This discussion was created more than 6 months ago and has been closed. To start a new discussion with a link back to this one, click here.
Complex strain energy in frequency domain study?
Posted 3 nov. 2011, 12:52 UTC−4 Modeling Tools & Definitions, Parameters, Variables, & Functions, Results & Visualization, Structural Mechanics Version 4.2 0 Replies
Please login with a confirmed email address before reporting spam
One thought I had is that the physical strain energy as a function of time U(t) is just equal to the real part of |U0|*exp(i \omega t). But that can't be true because strain energy is always positive. Taking U(t) = Re[ U0 exp(i \omega t) ] means it would go negative.
Also, if the displacement is oscillating at \omega, then the strain energy should be oscillating at 2*\omega. For example, for a 1D spring, x=x0*cos(\omega*t) => U ~ k x^2 ~ cos(\omega*t)^2 ~ (1 + cos(2\omega*t))/2.
What is implied when COMSOL returns a complex derived quantity in a frequency domain study.
Hello phys314
Your Discussion has gone 30 days without a reply. If you still need help with COMSOL and have an on-subscription license, please visit our Support Center for help.
If you do not hold an on-subscription license, you may find an answer in another Discussion or in the Knowledge Base.