Determining patterns of some defect-symptom type diagnostic relations for a turboset in steady-state operation and rundown conditions

摘要

The article presents results of the research oriented on determining a set of diagnostic relations referring to a special, but relatively common class of turboset defects, consisting in the misalignment of great turbine set bearings with respect to their designed base positions. The paper discusses a collection of types of the diagnostic relations obtained via simulation calculations of the dynamic state of the machine in steady-state operation and transient conditions. Numerical calculations were carried-out, with the aid of a package of MESWIR codes, on a model turbine set in which the bearings have been dislocated by the maximum permissible range. For this purpose the maximum permissible misalignments of all seven turbine set bearings were calculated. The research makes it possible to formulate a system of diagnostic relations connected with the bearing lateral dislocation defect, which can make the knowledge basis for a diagnostic system.