CURRENT STATE AND PROSPECTS OF INCREASING THE RELIABILITY OF TRIBODIAGNOSTICS IN ASSESSING TECHNICAL CONDITIONS OF THE OIL LUBRICATION SYSTEMS OF GAS-TURBINE AIRCRAFT ENGINES

The issues regarding the reliability of assessing health of the oiled joints of aircraft gas turbine engines (GTE) proceeding from the  results of spectral and ferrographic measurement of the parameters  of wear particles are considered. It is shown that, due to design  features of the oil system analysis of the oil sample does not provide  enough information about the wear processes in the GTE  joints. Growth of the number of diagnostic parameters (particle  concentration, form and size) does not significantly in- crease the  reliability of health assessment, whereas analysis of the oil filter  wipe sampling provides full information about engine wear  processes. The main measurement instrumentation requirements are considered. High reliability of diagnostic results can be attained  when the parameters of wear particles are measured over the full range of their variation. Issues regarding the recurrence of engine health assessment in case of using fine-meshed oil filter with 600-h  lifetime are discussed. The use of expendable oil filters with a  diagnostic layer can solve the problem. Diagnostic potentials of some promising methods of assessment and prognosis of the oiingl system health in aircraft GTE are evaluated.

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