- [Instructor] This video provides an overview of
Frequency Response analysis results
and how to interpret them.
The Frequency Response output in SOLIDWORKS
consists of two components.
The first is the Magnitude and this is an absolute value.
It's available in both contour plots and response graphs.
The second output quantity is the Phase
and this is only available in graphs.
It's not available as a contour plot.
Now if you look at Frequency Response results,
both Magnitude and Phase are needed
to fully define the response at any highlighted node.
The node in the corner here, indicated with the arrow,
has been plotted and we have two Frequency Response graphs.
The top one is the Magnitude
and the bottom one is the Phase.
Now, as the response passes through
each resonant frequency, there is a potential
phase change.
We can see quite a few phase changes in here,
from 0 to 180 and 180 back to 0.
If we look at a mode at 42 Hertz of the plate,
this is the torsion mode and it's shown
as a Normal Mode plot.
Frequency Response displacement plot
for 42 Hertz is shown below
and it looks somewhat different.
The nodal line I've shown is running
along the torsional axis.
The Mode plot implies the phase change
between the two corners, which is 180 degrees.
The Frequency Response plot only shows
the magnitude so it shows a kind of folded
or mirrored version of the displacement,
its only magnitude.
Now this can be quite confusing and it requires
quite a bit of interpretation
and it's quite a good idea to actually
have the Mode plot available
so you can actually figure out
what's going on with the Magnitude plot
and the implied phasing.
Now the interpretation of Frequency Response
displaced shapes can be tricky.
The higher order Mode shapes can be very complex,
so again here we have the plate going up
to Mode one, two, three, four.
Mode four again starting to become quite complicated
and the corresponding Frequency Response Magnitude plot
for displacement is confusing,
so using Mode shape plots to help steer you again,
very much recommended.
So, in summary, we need both Magnitude and Phase
to understand what's happening in a response.
We get that in response graphs,
we don't get that in response contour plots.
So the interpretation really falls back on
the Mode shape plots.