nMy question is how should I get the periodic load to enter to the harmonic response if I want to know the displacements within my load carrying structure?nApply the load at the location where it originates as an amplitude and direction in a Harmonic Response analysis. Make sure the damping has been properly defined. For a global propery, you can use Damping Controls under Analysis settings, The damping can be defined in Engineering Data if multiple materials are used in the structure. Don't do both because they are additive! Finally, in Analysis Settings, you must define a range of frequencies to analyze. This is the excitation frequency of the load. I recall that it didn't like being given a single frequency for the range. The software was written because most analysts want results over a range of excitation frequencies. If your target value was 330 Hz, just use 330 and 331 Hz for example.n