Dynamic Analysis of a Rotating Cardan Shaft under the Influence of a Breathing Crack and Dense Fluid Force

Table 1

Cardan shaft system parameters.

Shaft-disc properties	Value and units	Journal bearing	Value and units
Length of the shaft (L)	570 mm	Shaft lateral stiffness K0	7.35 × 10^5 Nm^−1
Shaft diameter (D)	10 mm	Damping of propeller shafts	200 Ns/m
Outer diameter (Dout)	75 mm	Torsional damping ratio	0.01234
Inner diameter (Din)	10 mm	Discs	Value and units
Density of the material ()	7800 kg·m^−3	Shaft-disc mass (M1 = M2)	16.845 kg
Modulus of elasticity (E)	2.11 × 10^11 Pa	Unbalance mass (mu)	0.25 kg
Hooke’s joint angle ()		Mass eccentricity (e)	10 mm
Depth of the crack ()	0.3	Disc thickness (Ddisc)	25 mm