Perfection of methods of conducting resonance tests of rotor blades being part of the engine

The new method of resonance test of rotor blades using blade oscillation non-contact diagnostics is presented. Diagnosticsis based on narrowband spectral analysis of signals with high static pressure pulsation sensors mounted on the engine case. Experimental results of the turbomachinery rotor blades dynamic strength at bench tests using non-contact diagnostics resonance vibrations of blades are given. It is studied the resonant vibrations of rotor blades of the compressor and turbine of experimental turboprop engine and high-pressure compressor of a gas turbine engine with a promising diagnostic method using resonant vibrations of rotor blades by the signals from the sensors pulsation of static pressure, based on the measurement of pressure fluctuations in the flow of the blades repetition frequency, with using the Campbell diagram, identified by waveform blades, the main harmonic excitation of resonant oscillations of circumferential unevenness flow, as well as modes for the resonance testing of rotor blades. It is shown that the application of the new method can significantly improve the efficiency and reliability of the rotor blades resonant vibrations diagnostics, and reduce material costs of resonance testing compared with traditional technology determine the resonant modes on the basis of the calculation methods.