THE INFLUENCE OF DEFECT, SUCH AS “NICK” ON FREQUENCY CHARACTERISTICS OF COMPRESSOR`S WORKING BLADES

E.V. Martsenyuk, A.I. Garkusha, V.S. Chigrin

Development of methods to diagnose fatigue damage of GTE parts and the degradation rate of the mechanical properties because of temperature-force influence during maintenance with high reliability is an actual problem. In this paper the results of experimental and theoretical studies of the damages influence, such as "Nick", on the blade`s eigenfrequencies are presented. The frequency characteristics of compressor blade were considered with various damages. Solid model of the blade was designed. While comparing the results of analytical determination of the frequency characteristics with the experimental data debugging of the model was performed. It was noted that there is definite value of damages, which can be clearly seen in rejection of "leading" eigenfrequencies of the reference blade considered forms.

Key words: eigenfrequencies, frequency characteristic, nick, blade, defect, solid model.