METHOD OF DETERMINING ANGLE OF TWIST Russian patent published in 2012 - IPC G01D5/244 

FIELD: physics.

SUBSTANCE: 0° position of a section of a first shaft is determined first from the signal from the first shaft, and the 0° position of a section of a second shaft is determined from the signal from the second shaft. Further, the signal from the first shaft and the signal from the second shaft are broken down via Fourier analysis into frequency components of harmonic oscillations, wherein frequency f_n1 is calculated for said signal from the first shaft and frequency f_n2 is calculated for said signal from the second shaft. Each frequency is calculated as a complex indicator z_n, based on the absolute value a_n and phase φ_n of the order n, wherein each of the indicators z_n characterises angular velocity ω_n at said specific frequency f_n. For frequency f_n1 and frequency f_n2, the found angle φ_n of the complex indicator z_n is divided by order n, while calculating standardised complex indicators N_n. The standardised complex indicators N_n are summed up in a complex manner such that the first resultant complex indicator z_g1 is calculated from frequency f_n1 and the second resultant complex indicator z_g2 is calculated from frequency f_n2. Further, the length of the resultant complex indicators z_g corresponds, in each case, to the arithmetic sum of the lengths of separate complex indicators z_g. The angle formed by the first resultant complex indicator z_g1 and the second resultant complex indicator z_g2 is equal to angle α.

EFFECT: high accuracy of angle determination.

8 cl, 4 dwg