Rotary machine vibration measurement method based on micro motion amplification

Abstract

The invention provides a rotary machine vibration measurement method based on micro motion amplification. The method comprises the steps that step 1, pasting mark points to the surface of a rotary machine; step 2, selecting parameters of a high-speed camera, and performing video acquisition by using the high-speed camera after the selection is completed; step 3, performing object motion amplification processing on an acquired high-speed video by adopting a micro motion amplification technology; step 4, performing optical flow calculation on the amplified high-speed video; step 5, obtaining a vibration frequency, a phase, an amplitude and an energy spectrum according to an optical flow calculation result; and step 6, obtaining a measurement result of the mark point. The method has the advantages of being high in reliability and precision, free of contact, easy to implement and the like.

Description

technical field [0001] The invention belongs to the fields of computer vision, mechanical dynamics and control and non-destructive testing technology, and in particular relates to a method for measuring vibration of rotating machinery based on micro-motion amplification. Background technique [0002] Rotating machinery is the core equipment in modern industry, and plays an important role as core equipment in the fields of vehicles, power engineering, petroleum, chemical industry, aviation, and aerospace. Fault diagnosis and condition monitoring of rotating machinery is a necessary means to detect early equipment failures and identify damage in time, and is an effective means to maintain the safe operation of rotating machinery equipment. However, the current vibration monitoring methods for rotating machinery mainly include contact measurement methods and non-contact measurement methods. Among them, the contact method needs to install sensing elements directly on the rotati...

AI Technical Summary

Problems solved by technology

[0003] However, the current non-contact measurement has also encountered technical bottlenecks. For example, the laser vibrometer is a relatively accurate non-contact measurement instrument, but for high-speed rotating components such as blades, disks, and shafts, the laser measurement point is in high-speed motion. , cannot be fixed at one point, which makes the laser vibrometer unable to be applied to the measurement of dynamic parts rotating at high speed

In addition, although the wireless sensor with the launch function can be attached to the rotating part for measurement, its mass is generally large, and even a lighter wireless sensor will bring a large eccentric inertial force to the rotating motion, making the measurement result inaccurate , even eccentricity will cause changes in its dynamic behavior, such as instability, etc.

Other non-contact sensors, such as eddy current sensors, need to leave a very small measurement distance at high-speed rotating parts, and the large vibration of high-speed rotating machinery will cause its interference collision

Therefore, other wireless sensors and measurement solutions have encountered technical bottlenecks

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