DETUNING IMPACT OF COUPLE OF BLADES WITH FRICTION ELEMENT ON BENDING OSCILLATION

This presented work is concerned with a friction element impact and detuning mass impact on the bending oscillation of a couple of blades with a friction element embedded between the blade shrouds. Either of the blades is discretized by FEM using beam elements and continuously distributed weight is concentrated in nodal points. One of the blades is excited by harmonic varying force. The friction element, which is considered as a rigid body, is pulled using constant tension force into a wedge gap between the blade shrouds. The detuning of this system is caused by an additional mass mounting on one of the blade shrouds. Numerical simulation results are compared with results of the equivalent linearization method. The effects of the friction and detuning on the blades vibration suppression are analyzed.