Measurement and assessment of torsion oscillations in turbogenerators by using a torque sensor and robust observer

A new method of measuring torsional vibrations is presented. Based on a contactless sensor and under the use of a robust observer it is possible to measure and calculate torsional torques appearing at a shaft train online. The new concept allows to prevent shaft trains from serious damages caused by torsional oscillations. Il is shown that the observer-based estimation of the torque is as good as the direct measured value.