METHOD OF ACCELERATED MEASUREMENT OF COORDINATE COMPONENTS OF OFFSETS OF ENDS OF TURBOMACHINE ROTOR BLADES

摘要

FIELD: machine building.;SUBSTANCE: separate determination of offsets of ends of blades in radial, axial directions and in direction of rotor rotation is performed by means of three high-temperature single-turn eddy-current converters. Converters are arranged on stator casing within three sections of its surface. One point arranged in sensitivity zone of the corresponding converter is chosen in each section. Points are located from each other at four thirds of angular pitch of blade setting on the controlled rotor wheel. Conversion of inductances of sensitive elements to voltages and recording of the corresponding digital codes is performed per one rotor turn. At that, converters perform the functions of operating and compensation converters alternately with input of each pulse of synchronised sequence, which is shaped when the rotor is turned through an angle equal to one third of angular blade setting pitch.;EFFECT: improvement of quick action due to shortening of the time required for acquisition of information and accuracy due to reduction of dynamic error caused by possible instability of rotor rotation period within the shorter information acquisition time.;1 tbl, 3 dwg