Non-contact real-time online vibration measurement method based on images

Abstract

The invention discloses a non-contact real-time online vibration measurement method based on images, and belongs to the field of vibration measurement and analysis. The method includes the steps that a vibration process of a target object is recorded through a high-speed camera, all frames of images contained in a vibration video of the target object are extracted through vibration measurement software arranged in a computer and are stored in a memory pool opened up by the vibration measurement software arranged in the computer, a thread pool is created in the vibration measurement software arranged in the computer, corresponding image frames are extracted from the memory pool by different threads in the thread pool in order, coordinates of the images and an actual object are established so that the size conversion matrix M between the images and the actual object can be solved, and therefore actual coordinates and displacement imaged through the camera are mapped in the vibration process and a measuring result and a data curve are output. A non-contact measurement mode is adopted in the method, vibration characteristics of test objects cannot be changed, measurement accuracy is high, and vibration characteristic measurement can be conducted on vibration objects under poisonous and harmful, high-temperature and dangerous environments.

Description

technical field [0001] The invention belongs to the field of vibration measurement and analysis, and more specifically relates to a non-contact real-time online vibration measurement method based on images. Background technique [0002] Mechanical vibration is a ubiquitous physical phenomenon in nature, engineering technology and daily life. In industrial production, many failures are closely related to mechanical movement or vibration, and the role of vibration detection in all walks of life cannot be underestimated. [0003] In the existing vibration measurement technology, there are mainly contact measurement methods using various strain gauges or acceleration sensors and non-contact measurement methods using laser Doppler effect or laser interference technology. Among them, contact measurement methods such as acceleration sensors are the main ones. In the application, there are a series of limitations such as troublesome wiring of contact measurement sensors, low effici...

AI Technical Summary

Problems solved by technology

To a certain extent, this application has the advantages of non-contact, wide measurement range, and does not change the vibration characteristics of the measured object. However, the installation of the camera in this application requires special requirements, which is cumbersome, and uses a non-contact image-based vibration measurement method. , the amount of calculation involved in image processing and analysis is very heavy, requiring a very high processing speed of the CPU, otherwise the vibration measurement process will fall into a long wait and cannot meet the real-time requirements of the measurement site

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