FIELD: jet engines for aviation and space-rocket engineering. SUBSTANCE: space under inspection around engine is divided into n (n > 1) sections. Installed in each section on or near external surface of engine are k (k > 1) three-component sensing antennas. One of three components of each sensing antenna is positioned along center line of outflowing jet and engine structure; two other components are orthogonal to it. Three orthogonal components of electric field signal fluctuations and three orthogonal components of jet field signal fluctuations are measured; in absence of jet, respective components of noise signals are measured. Measurement results are subjected to spectral analysis. Relative spectral and correlation characteristics of components of equally oriented signals are determined for each pair of sensing antennas of two adjacent sections as well as of signals of each sensing antenna and signals of engine operating conditions. Characteristics obtained are corrected including noise signals, spectral components of abnormal (erosion) process components are detected within desired frequency ranges for various operating conditions and time spaces. Regressive relations between intensities of abnormal (erosion) processes and engine operating conditions are calculated, and dependences obtained are converted into respective signal voltages to be compared with reference signals. EFFECT: improved reliability of diagnosing results. 6 dwg
