Study of Run-Up Free Rotor

In this example, the behavior of a rotor without a housing is studied.

It is a simple so-called clamped free rotor, with a disk mounted at the free end and a clamped support at the fixed end, as shown in Figure 1.

Figure 1: Clamped rotor with a disk.

For a clamped rotor, the displacement and the slope of the displacement curve must be zero at the clamped end. In this example, only one flexible beam element is used to model the shaft. A higher number of elements can of course be used by changing the parameter n of the shaft. The flexibleSupport represents damping added through a bearing and facilitates smoother handling of transients by incorporating additional damping into the connection between the shaft and disk.

The response during a run-up is the classical force response curve with a typical resonance, as shown in Figure 2. 

Figure 2: Disk deflection under increasing rotor speed.