Frequency-Domain Studies
In the frequency domain, the frequency response is studied when applying harmonic loads. Harmonic loads are specified using two components:
•
The amplitude value in direction
m
,
F
m
•
The corresponding phase,
To derive the equations for the linear response from harmonic excitation loads
Assume a harmonic response with the same angular frequency as the excitation load
The relationship can also be described using complex notation with
and
The primary results, such as displacements, velocities, accelerations, and stress and strain components are all complex valued.
