METHOD OF IDENTIFICATION OF IMPELLER BLADES NUMBERS WHEN MEASURING RADIAL CLEARANCES BETWEEN BLADES ENDS AND STATOR SHELL OF TURBO-MACHINE Russian patent published in 2018 - IPC G01B7/14 

FIELD: measuring equipment.

SUBSTANCE: invention relates to measuring equipment and can be used in measuring radial clearances in turbomachines. Core: an eddy current converter is introduced into interaction with ends of the blades of a working turbomachine. Eddy current converter is excited by a continuous pulse train not synchronized with the rotation of the impeller. Recorded is the measuring sample of the eddy current converter signals in the form of digital codes in a volume not less than two full rotations of the impeller. Calculated are radial clearances of the blades according to the codes that are within the measuring sample and further recorded in an array of clearances, while maintaining the order of the blades arrangement within the measuring sample. Computed is an array of functionals defined as an Euclidean distance between the elements of the clearances array and the reference array by sequentially moving the beginning of the reference array along the elements of the clearances array to the value of the indices equal to the number of the impeller blades. Recorded is the beginning of the blades numbering in the clearances array corresponding to their location within the reference array by the position of the minimum value in the array of functionals.

EFFECT: technical result is eliminating hardware redundancy by removing the synchronization sensor and replacing its functions with measurement data processing operations.

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