CN-120845276-B - Intelligent shooting control method and system for fan blade in non-stop state

CN120845276BCN 120845276 BCN120845276 BCN 120845276BCN-120845276-B

Abstract

The invention relates to the technical field of image shooting control, in particular to an intelligent shooting control method and system for a fan blade in a non-stop state, comprising the steps of obtaining the geometric characteristics of the blade of a target fan, dividing the blade into a plurality of speed characteristic intervals along the radial direction, and establishing the corresponding relation between the speed characteristic intervals and the radial positions; the method comprises the steps of monitoring the rotation speed of an impeller and the angle position of a blade in real time through a sensor, calculating the real-time linear speed of a speed characteristic interval based on the rotation speed of the impeller and the radial position, calculating the optimal exposure time corresponding to the speed characteristic interval, determining an aperture value and a sensitivity parameter corresponding to the speed characteristic interval by combining the current illumination condition and imaging quality, predicting the time of reaching a preset shooting position of a target blade speed characteristic interval based on the rotation speed of the impeller and the angle position of the blade, generating a shooting control signal, switching the shooting parameters when the target blade reaches the shooting position, acquiring a speed characteristic interval image, and adjusting the shooting parameter range when the image quality is lower than a preset threshold value.

Inventors

DU JUAN
SHENG XIAOFEI
Match gill is exhaled
WANG SHENYANG
WANG ZHENHUA

Assignees

苏州智轻光电科技有限公司

Dates

Publication Date: 20260505
Application Date: 20250919

Claims (8)

1. An intelligent shooting control method for a fan blade in a non-stop state is characterized by comprising the following steps: obtaining the geometric characteristics of a blade of a target fan, dividing the blade into a plurality of speed characteristic intervals along the radial direction, wherein the speed characteristic intervals correspond to different radial positions, and establishing the corresponding relation between the speed characteristic intervals and the radial positions; the method comprises the steps of monitoring the rotating speed of an impeller and the angle position of blades in real time through a sensor, and calculating the real-time linear speed of a speed characteristic interval based on the rotating speed of the impeller and the radial position; According to the real-time linear speed, respectively calculating the optimal exposure time corresponding to the speed characteristic interval, and determining an aperture value and a sensitivity parameter corresponding to the speed characteristic interval by combining the current illumination condition and imaging quality; Based on the rotation speed of the impeller and the angle position of the blade, predicting the time when the speed characteristic interval of the target blade reaches a preset shooting position, generating a shooting control signal, and switching shooting parameters of the corresponding speed characteristic interval when the speed characteristic interval of the target blade sequentially reaches the shooting position to acquire a speed characteristic interval image; And (3) carrying out definition and contrast analysis on the images of the speed characteristic intervals, and adjusting the shooting parameter range of the corresponding speed characteristic interval when the image quality index is lower than a preset threshold value.
2. The intelligent shooting control method for the fan blade in the non-stop state is characterized by comprising the specific steps of obtaining blade length, blade root radius and blade tip radius data, calculating the blade radial length, setting a linear speed difference threshold value of adjacent intervals, dividing radial position points according to the linear speed difference threshold value in an increasing mode from the blade root, defining an area between the adjacent radial position points as a speed characteristic interval, recording a starting radial position, an ending radial position and a central radial position in each speed characteristic interval, establishing a database of speed characteristic interval numbers and corresponding radial position ranges, and forming a mapping relation between the speed characteristic interval and the radial position.
3. The intelligent shooting control method for the fan blade in the non-stop state is characterized in that the real-time linear speed acquisition process comprises the steps of acquiring revolution data of an impeller per minute through a revolution speed sensor, converting the revolution data into angular speed, acquiring the current angle position of the blade through a blade position sensor, determining the spatial attitude of the blade, extracting central radial position data for each speed characteristic interval, multiplying the central radial position by the angular speed to obtain the instantaneous linear speed of the speed characteristic interval, establishing a linear speed data cache, performing smooth filtering processing on the linear speed data of a plurality of continuous periods, and outputting a stable real-time linear speed value.
4. The intelligent shooting control method for the fan blade in the non-stop state is characterized by comprising the steps of calculating optimal exposure time, determining an aperture value and a sensitivity parameter, wherein the step of setting an allowable maximum pixel fuzzy distance based on a motion fuzzy control principle, dividing the maximum pixel fuzzy distance by a real-time linear speed of a corresponding speed characteristic interval to obtain the optimal exposure time of the speed characteristic interval, obtaining current ambient illumination intensity data through an illumination sensor, calculating a reference aperture value according to a target imaging brightness requirement, adjusting the aperture value according to an exposure compensation principle according to the ratio of the optimal exposure time to the reference exposure time, correspondingly increasing the aperture value when the exposure time is shortened, and performing exposure compensation by increasing the sensitivity value when the aperture value reaches a physical limit of a lens.
5. The intelligent shooting control method for the fan blade in the non-stop state is characterized in that the process of predicting the time when a target blade speed characteristic interval reaches a preset shooting position is to set the optimal shooting angle position of the blade, establish the angle coordinate of the shooting position, acquire the current angle position and the angular speed data of the target blade in real time, calculate the angle difference value between the current position of the blade and the preset shooting position, divide the angle difference value by the current angular speed to obtain the expected time when the blade reaches the shooting position, trigger the time amount in advance on the basis of the expected time by considering the switching time and the response delay of camera parameters, generate shooting control signals corresponding to each speed characteristic interval, establish a shooting time sequence queue, and arrange the control signals according to the sequence of the arrival of each speed characteristic interval at the shooting position.
6. The intelligent shooting control method for the fan blade in the non-stop state is characterized by comprising the steps of automatically switching exposure time, aperture value and sensitivity parameters of a camera to a corresponding speed characteristic section after receiving a shooting control signal, triggering a camera shutter to shoot when a target blade speed characteristic section enters a shooting visual field, preprocessing raw image data obtained through shooting, including noise filtering and brightness equalization, extracting an area of the corresponding speed characteristic section of the image, marking and numbering the image area in combination with blade position information, storing the processed speed characteristic section image in an image database, and establishing an associated record of the image, the blade position and the shooting time.
7. The intelligent shooting control method for the fan blade in the non-stop state is characterized by comprising the specific adjustment process of adjusting a shooting parameter range, namely performing definition analysis on a speed characteristic interval image, obtaining a definition value through calculating an image gradient amplitude, performing contrast analysis on the speed characteristic interval image, obtaining a contrast value through calculating a standard deviation of image brightness distribution, setting a qualified threshold of definition and contrast, judging that image quality is unqualified when any index is lower than the qualified threshold, shortening an exposure time upper limit of the speed characteristic interval for the interval with unqualified definition, adjusting an aperture value range and/or a sensitivity range of the speed characteristic interval for the interval with unqualified contrast, optimizing imaging brightness distribution, and updating the adjusted parameter range to a shooting parameter database for shooting control of the subsequent speed characteristic interval.
8. An intelligent shooting control system for a fan blade in a non-stop state is characterized by comprising a blade radial partitioning module, a motion parameter monitoring module, a regional shooting parameter calculating module, a regional shooting image acquiring module and a parameter optimizing module, wherein the blade radial partitioning module acquires the blade geometric characteristic of a target fan, radially partitions the blade into a plurality of speed characteristic sections, the speed characteristic sections correspond to different radial positions, a corresponding relation between the speed characteristic sections and the radial positions is established, the motion parameter monitoring module monitors the rotating speed of an impeller and the angle position of the blade in real time, calculates the real-time linear speed of the speed characteristic sections based on the rotating speed of the impeller and the radial positions, the regional shooting parameter calculating module calculates the optimal exposure time corresponding to the speed characteristic sections according to the real-time linear speed, respectively determines the aperture value and the sensitivity parameter corresponding to the speed characteristic sections according to the current illumination condition and the imaging quality, predicts the time when the speed characteristic sections of the target blade reach the preset shooting position based on the rotating speed of the impeller and the angle position of the blade, generates shooting control signals, and when the speed characteristic sections of the target blade sequentially reach the shooting position, the shooting parameters of the corresponding speed characteristic sections are switched, a speed characteristic section image is obtained, and the regional shooting parameter optimizing module carries out clear contrast analysis on the speed characteristic section image and a speed characteristic section image when the image quality index is lower than a preset threshold value.

Description

Intelligent shooting control method and system for fan blade in non-stop state Technical Field The invention relates to the technical field of image shooting control, in particular to an intelligent shooting control method and system for a fan blade in a non-stop state. Background Wind power generation is an important component of clean energy, and safe and reliable operation of equipment is of great importance. The fan blade is used as a core component of the wind generating set, bears complex alternating load and severe environmental conditions for a long time, and is easy to generate the defects of surface abrasion, cracks, lightning stroke damage and the like. These defects, if not found and handled in time, may lead to serious accidents such as blade breakage, etc., causing huge economic loss and potential safety hazard. However, the existing non-stop detection technology mainly adopts a remote shooting mode, but faces a plurality of technical challenges. The most prominent problem is that the linear velocity difference of different parts in the rotation process of the blade is huge, namely, taking a typical impeller with the diameter of 120 meters as an example, the linear velocity of the root of the blade is close to zero, and the linear velocity of the tip of the blade can reach more than 80 meters/second, and the difference is several times or even tens of times. When uniform shooting parameters are adopted, imaging effects of different parts of the blade are seriously inconsistent, the blade tip part is easy to generate motion blur, and the blade root part is possibly dark due to over short exposure time. In the prior art, fixed shooting parameters or a simple segmentation processing method are generally adopted, so that the problem of speed difference in the whole length range of the blade cannot be effectively solved, the quality of a detected image is uneven, and the accuracy and the reliability of defect identification are affected. Therefore, the intelligent shooting control method and system for the fan blade in the non-stop state are provided. Disclosure of Invention The invention aims to provide an intelligent shooting control method and system for a fan blade in a non-stop state, wherein the intelligent shooting control method comprises the steps of obtaining the geometric characteristics of the blade of a target fan, dividing the blade into a plurality of speed characteristic intervals along the radial direction, and establishing the corresponding relation between the speed characteristic intervals and the radial positions; the method comprises the steps of monitoring the rotation speed of an impeller and the angle position of a blade in real time through a sensor, calculating the real-time linear speed of a speed characteristic interval based on the rotation speed of the impeller and the radial position, calculating the optimal exposure time corresponding to the speed characteristic interval, determining an aperture value and a sensitivity parameter corresponding to the speed characteristic interval by combining the current illumination condition and imaging quality, predicting the time of reaching a preset shooting position of a target blade speed characteristic interval based on the rotation speed of the impeller and the angle position of the blade, generating a shooting control signal, switching the shooting parameters when the target blade reaches the shooting position, acquiring a speed characteristic interval image, and adjusting the shooting parameter range when the image quality is lower than a preset threshold value. In order to achieve the above purpose, the present invention provides the following technical solutions: An intelligent shooting control method for a fan blade in a non-stop state comprises the following steps: obtaining the geometric characteristics of a blade of a target fan, dividing the blade into a plurality of speed characteristic intervals along the radial direction, wherein the speed characteristic intervals correspond to different radial positions, and establishing the corresponding relation between the speed characteristic intervals and the radial positions; the method comprises the steps of monitoring the rotating speed of an impeller and the angle position of blades in real time through a sensor, and calculating the real-time linear speed of a speed characteristic interval based on the rotating speed of the impeller and the radial position; According to the real-time linear speed, respectively calculating the optimal exposure time corresponding to the speed characteristic interval, and determining an aperture value and a sensitivity parameter corresponding to the speed characteristic interval by combining the current illumination condition and imaging quality; Based on the rotation speed of the impeller and the angle position of the blade, predicting the time when the speed characteristic interval of the target blade reaches a preset shooting position,