Experimental Aspects in the Vibration-Based Condition Monitoring of Large Hydrogenerators

Table 2

Typical shaft relative and bearing absolute vibrations in the upper journal bearing of a LHG.

Date	Power	Shaft relative vibration []						Bearing absolute vibration [mm/]
		-direction			-direction			-direction			-direction
		Peak	1x	2x	Peak	1x	2x	RMS	1x	2x	RMS	1x	2x
04.03.09	522	63	23	0	80	44	3	0.13	0.01	0.00	0.13	0.03	0.00
04.07.09	583	66	26	0	79	45	3	0.11	0.04	0.00	0.11	0.01	0.01
04.14.09	694	67	23	0	65	35	3	0.14	0.04	0.00	0.14	0.01	0.00
04.22.09	680	64	23	0	63	32	2	0.13	0.00	0.00	0.14	0.03	0.00
04.29.09	682	56	12	0	59	26	4	0.13	0.00	0.00	0.14	0.03	0.01
01.06.10	638	61	32	1	83	46	3	0.16	0.01	0.00	0.15	0.05	0.00
01.14.10	617	60	32	2	81	46	2	0.13	0.01	0.01	0.13	0.05	0.00
01.21.10	474	57	28	2	76	42	2	0.10	0.01	0.00	0.10	0.05	0.00
01.22.10	629	62	30	1	83	44	2	0.15	0.00	0.00	0.14	0.05	0.00
01.28.10	552	58	29	2	73	40	3	0.11	0.01	0.00	0.11	0.05	0.00