Measurement method for wind vibration of non-contact blade based on image processing of MATLAB

Abstract

The invention discloses a measurement method for wind vibration of a non-contact blade based on image processing of an MATLAB. The method comprises the following steps that S1, blade wind vibration video is acquired, and a camera is used for conducting video collection on pneumatic vibration at the blade wind speed; S2, the frame rate and total frame number of the wind vibration video are acquiredthrough the MATLAB, and each frame of image of the video is processed in sequence; S3, position coordinates of a fluorescence target on the blade are acquired, through the position coordinates and time of two adjacent frames, the pneumatic response speed of the blade in the incoming flow direction and vertical direction can be calculated, and a time domain chart of the response speed of the bladeis drawn; S4, each frame of image is subjected to grey level transformation and two-value transformation, unimportant areas are removed, edge detection is conducted, a blade top point A and a blade handle end point B are acquired, an included angle between a line segment AB and a horizontal line is acquired, and a time domain chart of the blade angle is acquired. According to the measurement method, non-period vibration of the non-contact measurement blade under the airflow is achieved, and the vibration state sum of the blade at the wind speed can be measured and analyzed through high precision.

Description

technical field [0001] The invention belongs to the technical field of image processing, and in particular relates to a non-contact blade wind vibration measurement method based on MATLAB image processing. Background technique [0002] As the main tissue of plants, leaves are the main object of pesticide droplets and airflow in wind-driven spraying of fruit trees in agriculture, and the interaction between dynamic leaves and droplets has an important impact on deposition; in forestry, wind disasters are the most important cause of tree damage. The main reason is that the leaves are the main bearers of the airflow; the leaves can vibrate, deform and protect themselves under the airflow, and the research on plants and leaf bionics based on wind vibration has made some progress. At present, the instruments for non-contact measurement of the vibration of leaves under the airflow mainly include non-contact laser vibrometers and high-speed cameras. The non-contact laser vibrometer...

AI Technical Summary

Problems solved by technology

Using a high-speed camera and its supporting analysis software can accurately measure the vibration speed of the blade, but for the automatic measurement of the amplitude or angle under the forced vibration of the blade, and the two measuring instruments are expensive and limited by the environment, the operation is cumbersome, the workload is large and the efficiency is low.

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