Device and method for measuring rotating speed of rotating shaft based on variable density sine fringe

Abstract

The invention relates to a device and a method for measuring the rotating speed of a rotating shaft based on a variable density sine fringe. The device comprises the variable density sine fringe, a high-speed image collection module, a high-speed image transmission module, an imaging processing software module and a computer. The method comprises the following steps: adhering a sensor for the variable density sine fringe onto the surface of the periphery of a rotating shaft to be measured; carrying out continuous imaging and recording on the variable density fringe by the high-speed imaging collection module; transmitting an image of the fringe to the computer by the image transmission module; carrying out Fourier transform on fringe signals at the positions of the same row of pixels in each frame of image by the image processing software module and adopting a peak frequency correction method to accurately correct peak frequency so as to obtain accurate fringe density information, then obtaining a time domain curve with which a rotation angular speed of the rotating shaft at the position of the fringe is covered, and then calculating the rotating speed signal of the rotating shaft through the rotation angular speed and the sampling frequency of a camera. According to the device and the method, non-contact measurement for the rotating speed of the rotating shaft in a certain range of rotating speed can be realized, and the device is high in measuring speed and high in precision.

Description

technical field [0001] The invention relates to the technical field of optical measurement of rotation, in particular to a rotating shaft rotational speed measurement device and method based on variable density sinusoidal fringes. Background technique [0002] The measurement of rotation angle and rotation speed is very important and meaningful in some engineering fields, such as the rotation speed measurement of the rotating shaft of rotating equipment such as pumps and motors; the status information of these rotating equipment can be obtained through the measured rotation parameters and can be used for machine status monitoring and troubleshooting. For example, a bearing is a very important part of a rotating machine. Under long-term operation, it may cause local defects of the bearing, such as the wear of the inner ring, outer ring or roller of the bearing. These defects will cause internal shock or pulse vibration , and these defect information can be obtained by analyz...

AI Technical Summary

Problems solved by technology

Large-scale image acquisition will not only increase the burden on the acquisition system, but also put forward relatively high requirements for the transmission rate of image signals

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