Using Simplified Models to Assist Fault Detection and Diagnosis in Large Hydrogenerators

Figure 11

Vibration modes obtained with the Rigid Body Model, with the generator excited: (a) 1st mode (backward precession at 4.71 Hz); (b) 2nd mode (direct precession at 5.12 Hz); (c) 3rd mode (backward precession at 7.18 Hz); (d) 4th mode (direct precession at 7.91 Hz).

(a)

(b)

(c)

(d)