Elasticity of the long-length shafts of rotation transmission mechanical systems as a source of information in the tasks of control and preventing of extreme emergency

On the example of the elastic transmission of turboprop aircraft engine with differential gearbox and two co-axial propellers the task for obtaining of information in real-time concerned with torsion angle of the shaft is considered. The shaft transmits rotation (turbine´s torque) to prop-fan. It is suggested to use this information for the turbine´s torque identification in an effort to control and as a signal in system for leading cut-out of the engine in the case a dangerous situation preceding of the shaft´s destruction. The influence of the two types of the noises (measurement noise and vibration noise of the elastic shaft) on the accuracy of the shaft torsion angle estimation was investigated.