METHOD OF DETERMINING AXIAL FORCE ACTING ON TURBOMACHINE ROTOR DURING ITS OPERATION Russian patent published in 2020 - IPC G01M15/00 F02C7/32 F16B1/00 

FIELD: test technology.

SUBSTANCE: invention relates to field tests in operating conditions of turbomachine. Method of determining axial force acting on turbomachine rotor during its operation includes installation of strain gauges on elements of rotor support, their calibration, removal of signal from strain gauges, its recording and processing. At least two strain gauges are used, which are installed equidistant from each other in circumferential direction in at least one point, sensitive to occurrence of concentration of stresses from axial force and less subject to deformations from radial load from rotor on support elements, which are pre-determined before installation of strain gauges. Turbomachine is launched at test bench or in operating conditions with provision of its operation at required modes, wherein recording of signals from strain gauges is carried out during the entire start-up, and during processing of signals from strain gauges, influence of radial component of force from the rotor is excluded. Further, the processed signals are recalculated to the value of axial force from the rotor and a graph is plotted for variation of axial force from the rotor as to the time of starting the turbomachine during its operation. Rotor support is made with resilient element in form of bushing with longitudinal slots along its circumference, and strain gauges are installed on beams formed by slots. Strain gauges are installed on resilient element beams on side of slot. Installations of strain gauges are determined by finite element simulation. Elements of the rotor support are pre-processed only to provide output of wires from strain gauges and to provide quality and shape requirements of surface of support elements in places of strain gauges installation.

EFFECT: determination of axial force acting on turbomachine rotor during its operation without significant completion of rotor support elements.

5 cl, 2 dwg