RANDOM ERRORS IN MEASURING RADIAL CLEARANCES IN TURBO MACHINES AND METHOD FOR THEIR REDUCTION
V.N. Belopukhov
Samara Federal Research Scientific Center, Russian Academy of Sciences, Institute for the Control of Complex Systems, Russian Academy of Sciences, Samara, Russia
Keywords: turbo machine, impeller, rotation period, radial clearance measurement system, eddy-current sensor, measuring circuit noise, sampling error, statistical characteristics, extreme code value, amplitude value, code averaging
Abstract
A simple way for measuring the radial clearances with controlled accuracy due to reducing random error components is considered. Quantitative estimates of the accuracy, speed, and efficiency of the proposed method are provided. The method is stochastic, is based on the characteristics of the random errors and impeller rotation process periodicity, and makes it possible to perform measurements with the same accuracy over the entire range of rotation speeds of the rotor of a turbo machine. The method considered in the study allows avoiding the procedure of approximation of digital samples.
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