Table 4

Data acquisition parameters for frequency response evaluation (modes of spindle shaft)

Rig configurationModal shape
(description)		Exp.
frequency		FEM frequency
(calibrated
Model)		Absolute
error		Relative error (%)
Naked rotor
(No flywheel on the rotor)		Rigid tilting on transversal plane39 Hz38.6 Hz0.4 Hz1
Rigid bouncing on transversal Plane46 Hz47.4 Hz−1.4 Hz−3
Rigid tilting on vertical plane84 Hz84.2 Hz−0.2 Hz−0.2
Rigid bouncing on vertical plane111 Hz111.9 Hz−0.9 Hz−0.8
Rotor with flywheel 4 (1, 625kg/m2)Rigid tilting on transversal plane41 Hz38.3 Hz2.7 Hz6.6
Rigid bouncing on transversal plane35 Hz36.6 Hz−1.6 Hz−4.6
Rigid tilting on vertical plane75 Hz77.1 Hz−2.1 Hz−2.8
Rigid bouncing on vertical plane95 Hz94.6 Hz0.4 Hz0.4
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