High speed face array CCD shafting twisting vibration decoupling measurement method

Abstract

The invention provides a torsional oscillation decoupling measurement method for high-speed face array CCD shafting, comprising: using a helix marking lien on the tested shaft, and upper, lower edge lines on the tested shaft as objects to be shot, the horizontal scanning line of the face array CCD camera is parallel to the tested shaft; shooting image of helix marking line and motion image patch of certain horizontal imaging unit line array of the face array CCD camera on the horizontal line array, the variations of the image patch speed contains torsional oscillation and horizontal oscillation component information of the shaft, meanwhile observing two vertically crossed edge line images shot by the face array CCD camera, central line moving tracks of the two edge lines in the image are horizontal oscillation components of the tested shaft section in primary optical axis orthogonal face of the high-speed CCD camera; via information extraction and separation method, decoupling horizontal oscillation component and torsional oscillation during the image patch motion, in order to realize torsional oscillation measurement on the shafting. The invention has low sensitivity to light intensity or gray scale, low light source requirement, capable of estimating torque and eliminating horizontal oscillation interference.

Description

(1) Technical field [0001] The invention relates to a torsional vibration measurement method, in particular to a torsional vibration decoupling measurement method based on a high-speed area array CCD imaging technology for a mechanical shafting and capable of removing the interference of the lateral vibration of the shafting system. (2) Background technology [0002] All kinds of mechanical shafting, while transmitting torque, will also generate torsional vibration under the action of disturbance force, and the additional alternating stress of torsional vibration will sometimes cause fatigue fracture of the shafting system in a short time, and at the same time, due to the shaft Due to the unavoidable unbalanced mass of the system and the inevitable gravity of the horizontal shaft system, lateral vibrations are generated, which will have a certain impact on the measurement of torsional vibrations. In order to improve the safety of the shafting operation, it is very important ...

AI Technical Summary

Problems solved by technology

[0003] There are many ways to measure torsional vibration, including the early German Geiger mechanical torsional vibration instrument and the current torsional vibration instrument based on the principle of pulse cycle (using shaft end gears and magnetoelectric sensors to induce pulses or photoelectric code discs to generate pulses), in addition to using The laser Doppler effect torsional vibration meter and the instrumentation using the strain gauge to measure the torsional vibration torque have their own advantages and disadvantages, such as the need to install the shaft end of the gear and the encoder or the inability to eliminate the coupling of the lateral vibration to the torsional vibration. even more expensive

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