DEVICE FOR DETERMINING INTERNAL FRICTION AT TORSIONAL VIBRATIONS WITH INFRALOW FREQUENCY

摘要

The proposed device for determining internal friction at torsional vibrations of a shaft with infralow frequency contains an electromagnetic actuator for exciting vibrations and a unit for measuring and recording vibration amplitude. Current in the windings of the actuator electromagnets varies as a linear function of time. The actuator is controlled by a computer so that the current through the windings of the electromagnets would be terminated if the set-point amplitude of the deformation of the shaft is achieved. The unit for measuring and recording vibration amplitude contains an optical angle position transducer for the shaft.