METHOD DETERMINING TORQUE Russian patent published in 2003 - IPC

FIELD: force measuring equipment. SUBSTANCE: method can be used to measure torque transmitted by rotating shafts of various objects. Two signals phase- shifted one relative another are picked off in step with the aid of frequency pickups spaced apart over length of measurement section of shaft. These signals are converted into two frequency-modulated signals before extraction of their difference beat frequency and torque is found by formula M_tor = K_Δϕ•K_sh•F_b, where F_b is beat frequency, Hz; K_Δϕ is frequency coefficient of shaft twisting found by formula where F_d is frequency deviation, Hz; K_sh is reference coefficient of given type of shaft defined as where G is shear modulus of material of shaft, N/m²; j_p is polar moment of inertia of section of shaft, m⁴; L is length of measurement section of shaft, m. EFFECT: widened technological capabilities, increased accuracy of method. 2 dwg