Wet Modal Analyses of Various Length Coaxial Sump Pump Rotors with Acoustic-Solid Coupling

Table 4

Material properties.

Rotor part	Material	Density ρ (kg∗m^−3)	Elastic modulus E (GPa)	Poisson’s ratio μ
Pump shaft	40Cr	7870	211	0.3
Impeller	#45 steel	7850	205	0.25