Erik Kostson
Ansys Employee
Hello
That is correct - harmonic analysis is in the frequency domain (not in time domain like a transient).
Time can come in as you said if one uses the fatigue tool in a harmonic analysis - that will give how many seconds the component can run at the excitation frequency before it fails.
This discussion might be useful if you look at the fatigue tool inside a harmonic response.
Finally one would not run transient for 15 minutes - since the system is in a steady state vibration harmonic is the analysis one could use.
We have courses on the subject which are useful:
All the best
Erik
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