A New Method for Field-Balancing of High-Speed Flexible Rotors without Trial Weights

Table 1

Natural frequencies of the rotor.

Mode number	Natural frequencies (Hz)		Measured modal damping (%)
	Calculated (FEM)	Measured (EMA)
1	20.563	20.358	0.302
2	64.428	63.917	0.285
3	123.682	122.153	0.254
4	183.213	180.636	0.228
5	265.147	262.523	0.206