APPARATUS AND METHOD FOR MONITORING TORSIONAL OSCILLATIONS OF A ROTATING SHAFT (VARIANTS) Russian patent published in 2022 - IPC G01H11/00 

FIELD: measuring equipment.

SUBSTANCE: invention relates to measuring equipment in the field of non-destructive testing of rotary machines and can be used to monitor the technical condition of shafts based on the parameters of torsional oscillations. The method is implemented by clarifying the values of the parameters of torsional oscillations of the shaft, determined from the signal of the angle marker sensor of the shaft, by means of mathematical adjustment of the values of the parameters of torsional oscillations of the shaft using the values of the parameters of the additional measurement signals determined at the times of detection of the angular position markers of the shaft by the angle marker sensor of the shaft, namely: lateral movement of the shaft (first variant) and/or vibration of the angle marker sensor of the shaft (second variant). The first and/or second variant of implementation of the apparatus and the method for monitoring torsional oscillations of the rotating shaft are selected based on the characteristics of dynamics and operation of the rotary machine or unit. The apparatus comprises, installed on the shaft: a measuring disk, an angle marker sensor of the shaft installed outside the shaft, and a measuring and computing torsional oscillation unit (IVB KK) for determining and recording the parameters of torsional oscillations of the rotating shaft. Additionally, the apparatus is equipped with one or two sensors of the lateral movement of the shaft (first variant) and/or a sensor of the vibration of the angle marker sensor of the shaft (second variant), connected to the IVB KK. While measuring the signal parameters of the angle marker sensor of the shaft, the signal parameters of the sensors of lateral movement of the shaft and/or the signal parameters of the sensor of the vibration of the angle marker sensor of the shaft are additionally measured simultaneously at the times of detection of the angular position markers of the shaft are detected by the angle marker sensor of the shaft. Said additional measurements are then used to clarify the values of the parameters of torsional oscillations of the shaft by adjusting the values of the signal parameters of the angle marker sensor of the shaft. In order to evaluate the parameters of torsional oscillations and the twist angle of the shaft between sections, the parameters of torsional oscillation are measured simultaneously in at least two measuring planes using angle marker sensors of the shaft, and the values of the signal parameters of the additional measurements determined at the times of detection of the angular position markers of the shaft by the angle marker sensors of the shaft, namely, the lateral movements of the shaft and/or the vibration parameters of the angle marker sensors of the shaft in these measuring planes, are used to clarify the values of the parameters of torsional oscillations of the shaft between sections and the twist angle of the shaft between sections.

EFFECT: higher accuracy of measuring the parameters of torsional oscillations of the shaft for the purpose of increasing the reliability of assessing the strain-stress state of the shaft and detecting the defects thereof early.

9 cl, 3 dwg