Experimental Estimation of Journal Bearing Stiffness for Damage Detection in Large Hydrogenerators

Table 6

Simulated shaft and bearing vibrations at the upper journal bearing, using the estimated bearing effective stiffnesses, including the errors in comparison to the vibrations shown in Table 4.

Condition	Simulated shaft vibrations [µm]				Simulated bearing vibrations [µm]
		Error [%]		Error [%]		Error [%]		Error [%]
1	4.2	−2.3	4.3	0.0	24.4	−0.4	24.5	0.0
2	9.2	−1.1	9.2	−1.1	26.5	0.0	26.5	0.4
3	30.0	−2.0	30.2	−0.3	29.0	0.3	29.0	0.7
4	9.5	−2.1	32.2	−0.9	25.9	−0.8	29.5	0.0
5	9.6	−1.0	10.1	−1.0	26.4	−0.4	26.7	0.0