Transient with FFT Study
In many cases, you can obtain a good overview of the response of the rotor by plotting the entire frequency spectrum of the time response at different angular speeds. Such a plot is called a waterfall diagram. The Transient with FFT study helps generate such data by performing the parametric sweep over the rotor angular speed. This study consists of a Time Dependent study step followed by a Time to Frequency FFT study step.
This type of study is computationally very expensive with a Solid Rotor interface, so this combination should only be used when the local deformation of the rotor plays a significant role in determining the overall dynamics of the rotor assembly.
In the COMSOL Multiphysics Reference Manual:
•
Time-Dependent Solver
•
Time-to-Frequency FFT
•
Studies and Solvers