A Method for Acquiring Synthetic Vibration Area of ​​Hydropower Unit Based on Image Gray Scale Superposition

Abstract

The invention discloses a method for obtaining a comprehensive vibration area of ​​a hydroelectric unit based on image grayscale superposition, comprising: step 1: collecting the measured values ​​of each measuring point on the hydroelectric unit; step 2: drawing the measured values ​​in step 1 according to the measured values ​​in step 1 The contour cloud map of each measuring point; the contour cloud map is divided into non-vibration area and vibration area; step 3: obtain the gray matrix E of each contour cloud map in step 2 i ; Step 4: Set each gray-scale matrix E according to the comprehensive vibration area division target i The weight coefficient w i And the threshold b; Step 5: Perform weighted summation on the grayscale matrix to obtain the integrated matrix, and adjust the color scale of the elements in the integrated matrix to form an integrated grayscale matrix E; Step 6: Output the integrated grayscale matrix in step 5 The cloud image of the comprehensive vibration area of ​​the target is obtained by forming an image. The present invention adopts the above method, can automatically generate the cloud map of the comprehensive vibration area, intuitively reflect the comprehensive vibration area, and can meet the acquisition requirements of the comprehensive vibration area of ​​different targets.

Description

technical field [0001] The invention belongs to the quality inspection of hydroelectric generators, and in particular relates to a method for obtaining a comprehensive vibration area of ​​a hydroelectric unit based on image gray scale superimposition. Background technique [0002] Various hydropower plants have entered the peak period of renovation and expansion. As new machines are gradually put into operation and old units are aging year by year, various problems are gradually exposed to the hydropower units of each power plant. An important factor in operation, the unit under harmful vibration for a long time is prone to fatigue damage and shortens the normal operation time of the unit. Therefore, dividing the vibration area of ​​the unit is of great significance for guiding the vibration-free operation of the unit and ensuring the safe and stable operation of the unit. The current method of obtaining vibration areas has the following shortcomings: 1) The acquisition of c...

AI Technical Summary

Problems solved by technology

The current method of obtaining vibration areas has the following shortcomings: 1) The acquisition of comprehensive vibration areas lacks quantitative analysis reflecting the characteristics of measuring points, and the decision-making of vibration avoidance often depends on the comprehensive vibration area. When the vibration area of ​​a single measuring point is used as the main analysis basis, It is often impractical to take anti-vibration measures when the data of each measuring point exceeds the vibration area, and it is necessary to have a deep understanding of the operating characteristics of each measuring point to make a comprehensive judgment on the vibration area; 2) Due to objective reasons such as time and water head, it is often only possible to Obtain vibration data under several water heads and loads. The acquisition of vibration areas under known data is difficult to provide sufficient and effective basis for acquisition of vibration areas under other unknown data. When further comprehensive vibration area acquisition is performed on the vibration areas of each measuring point, It will be more difficult to obtain the comprehensive vibration area under unknown data

3) There is a lack of means for automatic generation of comprehensive vibration area graphics. In the past, the graphics of comprehensive vibration areas were mostly based on the vibration areas of each measuring point, and then the final comprehensive manual drawing of vibration areas was performed using expert experience, and the integrated vibration areas with different targets were acquired (such as comprehensive Swing vibration area, integrated fixed component vibration area, integrated water turbine vibration area, integrated generator vibration area, etc.), unit transformation or long-term operation resulting in changes in the vibration area, need to repeatedly rely on expert experience, time-consuming, laborious, and low efficiency

[0003] Aiming at the lack of means for automatic generation of integrated vibration area graphics, which leads to time-consuming, laborious and inefficient acquisition of integrated vibration areas with different targets, it is necessary to provide a comprehensive vibration acquisition method for hydropower units based on image grayscale superposition to solve this problem

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