25 November 2019
A Modal Solution cell linked to the Setup cell of a Harmonic Response creates a Linear model for Harmonic Response. The harmonic response solution has the ability to automatically cluster solution points around a peak response as shown below. This means the peak response can be accurately found.
Full Harmonic Response sits on its own and the solution does not automatically cluster points around the peak response. That means the true peak response can be underestimated because of that. You can manually rerun the analysis with a narrower frequency range to get a more accurate estimate of the peak. The graph shown below is from a different system than the graph shown above, it is just to illustrate coarse sampling around the peak.
Those two systems look like this in Workbench.
You can also use a Static Structural model to Pre-stress either a MSUP Harmonic Response or a Full Harmonic Response as shown below.
In either case, the Static Structural changes the stiffness matrix that is used by the Modal or Harmonic Response, usually raising the frequency, such as when a guitar string or a drum head is tensioned.