Examples of industrial plant modeling
Torsional rotor dynamics - Distribution of inertia and stiffness

Figure 43 shows the shaft line of a compressor unit consisting of a 430 kW electric motor M, a high-speed coupling A _GV with moment of inertia I _GV, a gear reducer R, a low-speed coupling A _PV with moment of inertia I _PV, a flywheel V and a two-cylinder air compressor C. The motor runs at average speed N_E0 = 1487 rpm, and the compressor at speed N_S0 = – 425 rpm. The internal transmission of the gearbox is assumed to be rigid, i.e. the meshing rigidity of the component gears is infinite. We have :N_E0 = R_ES N_S0

with R_ES = – 3.5.

The torsional model of the system consists of eight...