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Avtometriya

2018 year, number 1

INFLUENCE OF TURBINE WHEELSPACE TEMPERATURE ON MEASUREMENTS OF RADIAL AND AXIAL DISPLACEMENTS OF THE BLADE TIPS

S. Yu. Borovik, M. M. Kuteynikova, Yu. N. Sekisov, O. P. Skobelev
Institute for the Control of Complex Systems, Russian Academy of Sciences, ul. Sadovaya 61, Samara 443020
Keywords: турбина, лопатки сложной формы, одновитковый вихретоковый датчик, радиальные и осевые смещения, способы устранения влияния температуры на датчик, turbine, complex-shaped blades, single-coil eddy current sensor, radial and axial displacements, methods of eliminating the influence of temperature on sensor

Abstract

The results of a simplified analysis of a differential measuring circuit with pulsed supply of the single-coil eddy current sensors connected to the circuit, with approximate differentiation of the currents, and with an output ADC. The circuit is designed as part of automation systems for tests of gas turbine engines. Methods for eliminating the effect of temperature on the sensors using the hardware and software of the measurement system are considered. A The families of transformation functions (dependences of the code on the desired radial and axial displacements) for the normal and nominal temperatures were determined using a model of the measuring circuit, and the differences of these families were used to determine the family of functions of temperature influence on code changes, which characterize possible errors. Quantitative estimates of the maximum values of the influence functions are given which confirm the efficiency of the proposed methods.