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.