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

Table 2

Parameters of the rigid body model.

Symbol	Description	Unit	Value
	Mass of LHG rotating part	kg
	Polar moment of inertia LHG rotating part	kgm^2
	Diametral moment of inertia LHG rotating part	kgm^2
	Upper journal bearing (UJB) effective mass	kg
	Lower journal bearing (LJB) effective mass	kg
	Turbine journal bearing (TJB) effective mass	kg
	UJB bearing main stiffness	N/m
	UJB bearing cross-coupling stiffness	N/m
	UJB bracket stiffness	N/m
	LJB bearing main stiffness	N/m
	LJB bearing cross-coupling stiffness	N/m
	LJB bracket stiffness	N/m
	TJB bearing main stiffness	N/m
	TJB bearing cross-coupling stiffness	N/m
	TJB bracket stiffness	N/m
	Generator magnetic stiffness	N/m
	Thrust bearing axial stiffness	N/m
	Turbine seals effective stiffness	N/m
	Distance center of mass, center of generator rotor	m
	Distance center of mass, center of UJB	m
	Distance center of mass, center of LJB	m
	Distance center of mass, center of TJB	m
	Distance center of mass, center of turbine rotor	m
	Distance center of mass, thrust bearing pivot	m