Generic Shaft | Operation

The shaft model offers a multi-mass implementation. Thus, it can be used to study sub-synchronous resonance phenomena. The objective of this model is to modelize the mechanical distortion and oscillation occurring in the shaft. First, a shaft model receives as inputs the three mechanical torque signals (th,ti,tl) coming from each steam turbine stage. As a results, the shaft model produces speed signal for each individual masses in the system.
Such a shaft model is represented physically in Figure 5 - 28. It can be observed that the different stages of the turbines are located on the same shaft, thus explaining possible torsional oscillations between different stages. The actual shaft model allows users to represent the behaviour using 1, 5 or 10 masses.

Representation of Shaft Model

Implementation of Shaft Model