Rotary shaft end face torsional vibration extraction method and device based on photogrammetry

Abstract

The invention relates to a rotary shaft end face torsional vibration extraction method and device based on photogrammetry, and the method comprises the steps: enabling a high-speed camera to be aligned with a rotary shaft end with a plurality of uniformly distributed targets for shooting, and obtaining each frame of shot image; fitting a target trajectory circle corresponding to each target in each frame of shot image, and determining a rotating shaft angular displacement amount based on the target trajectory circle; and determining a torsional vibration time domain graph of torsional vibration according to a drawing result of the angular displacement amount of the rotating shaft. The technical problems that in the prior art, rotating shaft torsional vibration field detection is difficult and the measuring error is large are solved, the influence of rotating shaft radial vibration on the torsional vibration measuring result is reduced, non-contact measurement is achieved, normal use of equipment is not influenced in the detection process, the detection time is shortened, and the working efficiency is improved.

Description

technical field [0001] The invention relates to the technical field of torsional vibration signal detection, in particular to a method and device for extracting torsional vibration of a rotating shaft end face based on photogrammetry. Background technique [0002] The vibration of rotating shaft equipment includes both axial vibration along the shaft and radial vibration perpendicular to the shaft, as well as torsional vibration along the axis of the shaft. Torsional vibration is a special form of vibration of rotating machinery shafting. It is essentially due to the elasticity of the shafting. When the crankshaft is rotating at an average speed, various elastic components will have different sizes and vibrations due to various reasons. The fluctuations in the instantaneous speed of different phases form a back and forth twist along the direction of rotation. Torsional vibration is extremely destructive. In mild cases, the torsional stress acting on the shaft will change, w...

AI Technical Summary

Problems solved by technology

[0004] In view of this, it is necessary to provide a method and device for extracting the torsional vibration of the end face of the rotating shaft based on photogrammetry, so as to solve the problems of difficulty in on-site detection of the torsional vibration of the rotating shaft and large measurement errors in the prior art

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