Stand for dynamic tests of methods vibration diagnostics of compressor blades

The article discusses the bench implementation of the method proposed by the authors for conducting experiments with rotor blades of axial compressors, the purpose of which is to develop methods for monitoring blade vibrations and algorithms for detecting characteristic defects (fatigue cracks) directly during compressor operation. To ensure the safety of experiments with damaged compressor blades, one of the heuristic principles for solving inventive problems, formulated by G.S. Altshuller, which consists in the fact that parts (blades) moving on a full-scale object are made stationary, and stationary parts (sensors) are set in motion in such a way as to maintain the speed of their relative movements. The design of the stand and the composition of the measuring instruments are considered. The results of experiments with serviceable compressor blades and blades with different stages of development of defects (fatigue cracks) are presented. It is shown that the graphical presentation of ranked arrays of measured time intervals allows one to judge the presence of a defect and the stage of its development.