METHOD FOR DETERMINING DYNAMIC STRESSES IN BLADES OF TURBOMACHINE WORKING WHEEL Russian patent published in 2017 - IPC G01M15/14 

FIELD: machine engineering.

SUBSTANCE: sensors are mounted on a body of the turbomachine above the working wheel blades, air flow pressure pulsations are recorded by means of at least four sensors, resonance oscillations of the working wheel blades are detected and resonance time sections are selected for each of sensors in oscillogram, the moments when the blades pass area under the sensors in the selected resonance time sections are determined, the deviations from theoretical moment of each blade passing under each sensor in absence of oscillatory processes are determined, according to which the nature of oscillations is defined, the form of resonance oscillations is diagnosed by comparing the obtained data with the reference forms of oscillations of turbomachine working wheel blades, motion and stresses in blade are determined by method of field finite elements, on diagnosed form of oscillations of working wheel blades with consideration of operation conditions and blade geometry, proportionality coefficient is found between determined displacements and deviation from the theoretical moment of blade passing in absence of oscillating processes in sensors mounting locations, and the pattern of blade dynamic stresses is determined during testing on detected form of oscillations and their maximum value.

EFFECT: determination of dynamic stresses in any region of turbomachine working wheel blade airfoil without installing sensors on rotating elements, increase in reliability of measuring system, reduced number of stand tests of the turbo-machine.

8 dwg