Thin-walled part micro-vibration measurement method and system based on motion amplification optical flow tracking

Abstract

The invention discloses a thin-walled part micro-vibration measurement method and system based on motion amplification optical flow tracking, and relates to the technical field of thin-walled part micro-vibration measurement. The method comprises the following steps of obtaining a target vibration frequency through the brightness change; processing a gray level image sequence through a phase Eulermethod and amplifying the vibration amplitude; processing a video subjected to motion amplification by adopting an optical flow tracking algorithm, extracting a vibration signal of a target angular point taking the pixel as a unit, and compensating the attenuation; and establishing a measurement mathematical model and converting the measurement mathematical model into a vibration signal of an actual unit. According to the thin-walled part micro-vibration measurement method based on the motion amplification optical flow tracking provided by the invention, a phase Euler amplification method andan optical flow tracking method are combined, so that the problem that the micro-vibration of a thin-walled part cannot be measured is effectively solved, and the method has the advantages of being convenient to operate, high in spatial resolution, non-contact, visual in micro-vibrations and the like.

Description

technical field

[0001] The invention relates to the technical field of micro-amplitude vibration measurement of thin-walled parts, in particular to a method and system for measuring micro-amplitude vibration of thin-walled parts based on motion amplification optical flow tracking. Background technique

[0002] The measurement and research of tiny vibration signals are of great significance in both military and civilian applications. This kind of vibration signal generally exists in the vibration of thin-walled parts of aero-engines. According to relevant studies, the vibration amplitude of thin-walled parts of aero-engines is between tens of microns and hundreds of microns. Since thin-walled parts are often used as the main structural form in aero-engines, accurate and efficient acquisition of vibration signals of aero-engines' thin-walled parts is of great significance for research on vibration characteristics analysis, vibration reduction optimization design, and structur...

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