Effects of the Hot Alignment of a Power Unit on Oil-Whip Instability Phenomena

Table 3

First five flexural critical speeds and dimensionless modal damping factors of the machine-train evaluated at 3000 rpm by means of the models no. 1, no. 2, and no. 3.

	Model no. 1		Model no. 2		Model no. 3
	Flexural critical speed	Damping factor	Flexural critical speed	Damping factor	Flexural critical speed	Damping factor
No.	(rpm)	dimensionless	(rpm)	dimensionless	(rpm)	dimensionless
1	842.9	0.01185	856.1	0.00886	798.4	−0.00777
2	993.8	0.02088	993.3	0.02044	963.2	0.03806
3	1033.4	0.02856	1032.7	0.02901	1007.5	0.03301
4	1082.4	0.00856	1078.0	0.01130	1043.7	0.02681
5	2059.9	0.06189	2105.3	0.05499	1938.2	0.03850