Steady State Harmonic Excitations

For steady state harmonic excitation analysis, the excitation is expressed in a general form:

Depending upon the excitation frequency type, the input screen can be different. For a conventional unbalance force:

For a constant harmonic excitation in both X and Y directions with an excitation frequency of 4 X the rotor speed:

Excitation frequency caries at a constant rotor speed is shown below. This is caused by the machine next to the one under study.

Note that Dir parameter can be: 0, 1, 2, 3, and 4. If Dir == 0, the force is a rotating force with

If Dir ==1, 2, 3, and 4, the force (or moment) is acting in x, y, rotation x, and rotation y, respectively. For variable excitation frequency, if w0=w2=0 and w1=1, this will be a synchronous excitation.

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