High speed face array CCD shafting twisting vibration decoupling measurement method

Abstract

The invention provides a high-speed surface array CCD shaft system torsional vibration decoupling measurement method. Taking a spiral marking line on the measured axis and the upper and lower edge lines of the measured axis as the subject, the horizontal scanning line of the area array CCD camera is parallel to the measured axis; the imaging of the spiral marking line and the area array CCD camera The movement of the image spot of a certain horizontal imaging unit line array on the horizontal line array, the change of the image spot speed carries the information of the torsional vibration and lateral vibration components of the axis, and at the same time observe the two images of the up and down interlaced translation captured by the area array CCD camera. Edge line image, the trajectory of the center line of the two edge lines on the image is the lateral vibration component of the measured axis section on the plane perpendicular to the main optical axis of the high-speed CCD camera; through information extraction and separation methods, decouple the above As the transverse vibration component and torsional vibration in the movement of the spot, the torsional vibration measurement of the shafting is realized. The method of the invention is not sensitive to light intensity or gray scale, has low requirements on the light source, can estimate torsional moment at the same time, and eliminates transverse vibration 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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