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

Table 3

Shaft relative vibrations measured by proximity transducers (in displacement) and bearing absolute vibrations measured by piezoelectric accelerometers and integrated by charge amplifiers (in velocity).

Journal bearing	Shaft relative vibrations		Bearing absolute vibrations
	-direction	-direction	-direction	-direction
Upper bearing
Lower bearing
Turbine bearing