Mechanical fault diagnosis method based on vision

Abstract

The invention discloses a mechanical fault diagnosis method based on vision. The invention relates to the field of mechanical fault diagnosis. According to the mechanical fault diagnosis method basedon vision, vibration signals of a fault rolling bearing are obtained based on vision, and the fault type is determined. According to the technical scheme, diagnosis is carried out according to the following steps that (1) a video image sequence of a running mechanical fault bearing serves as input, and the local amplitude and the local phase of local motion are obtained; 2) motion extraction is carried out according to the obtained local phase; 3) empirical mode decomposition is carried out; 4) an intrinsic mode function is calculated to obtain a correlation coefficient, 5) an envelope spectrum is drawn, and 6) the fault characteristic frequency of the bearing fault is calculated. The vibration measurement technology based on the vision is low in cost, high in flexibility, capable of remote measurement and the like, and thus can be widely applied, and the vibration measurement method based on the vision has significance in future research and development.

Description

technical field [0001] The invention relates to the field of mechanical fault diagnosis, in particular to a vision-based mechanical fault diagnosis method. Background technique [0002] With the rapid development of science and technology, rotating machinery has been more and more widely used in modern industry, and rotating machinery equipment is also playing an increasingly important role in modern industry. Rolling bearings are a very important part of rotating machinery and are used in different rotating machinery. The main cause of mechanical failure is caused by bearing failure. Among the failures of rotating machinery equipment, rolling bearing failures account for 70%, and 80% of motor failures are caused by motor bearing failures. The failure of rolling bearings will inevitably lead to abnormal operation of mechanical devices, and even lead to catastrophic consequences; bearing failures in motor drive systems will generate mechanical noise and attenuate the quality...

AI Technical Summary

Problems solved by technology

[0003] In the prior art, accelerometers are usually used for contact measurement of vibration, and the measurement accuracy is relatively high. However, when the mass of the measured object is small, the addition of the mass of the accelerometer will affect the measurement results; when measuring large objects When a large number of accelerometers are installed on the surface, it will be time-consuming and labor-intensive

And in some dangerous occasions such as high temperature, high pressure, vacuum, etc., it is not suitable to use accelerometers for measurement.

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