OBRABOTKAMETALLOV MATERIAL SCIENCE Том 23 № 3 2021 EQUIPMEN . INSTRUM TS Vol. 6 No. 2 2024 a b c Fig. 4. Spectrums ( ) , ( ) S S U X X S ω obtained on the basis of experiments (a); on the basis of digital sequence calculated after transformation by the model of power “white” noise (2) , ( ) S S X X S ω (b); example of direct measurement of AFC on the model (c) In fig. 4, a, the model-calculated spectra are highlighted in red color 1 1 (1) , ( ) X X S ω . The obtained sequences allow us to determine the coherence function ( ) 2 , ( ) U S S X X K ω (9). An example of this for various cutting speeds V3 and tool wear h is shown in fig. 5. There is also an example of evaluation of proximity of theoretical and experimental spectra ( ) , ( ) S S i X X ℘ ω . The frequenciesin which (2) , ( ) 0.7 S S X X S ω 〉 , are highlighted on the curves (2) , ( ) S S X X S ω . These results allow us to draw conclusions about the adequacy of the model (2). In the low-frequency range (2) , ( ) 1 S S X X S ω → . As the frequency increases, there is a tendency to decrease (2) , ( ) S S X X S ω , i.e. in the high-frequency region, usually lying outside the bandwidths of oscillating circuits (2) , ( ) 0 S S X X S ω → .
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