Steam turbine generator set torsion measuring method based on CCD photographing technique

A technology of turbogenerators and turbogenerators, applied in measuring devices, testing of machine/structural components, testing of static/dynamic balance, etc., capable of solving problems such as poor dynamic characteristics and limited measurement locations

Inactive Publication Date: 2006-11-15
HARBIN INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The technical problem to be solved by the present invention is to overcome the shortcomings of the above-mentioned non-contact measurement method, such as poor dynamic characteristics and very limited measurement positions, and provide a testing method with multiple measuring points and good dynamic characteristics

Method used

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  • Steam turbine generator set torsion measuring method based on CCD photographing technique
  • Steam turbine generator set torsion measuring method based on CCD photographing technique
  • Steam turbine generator set torsion measuring method based on CCD photographing technique

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specific Embodiment approach 1

[0015] Specific implementation mode one: the following combination figure 1 This embodiment will be specifically described. It is achieved through the following steps:

[0016] One, use several CCD cameras to take pictures of the paper tapes 2 with patterns pasted on different positions on the length of the turbine generator shaft 1 in front of the lens respectively, and each CCD camera takes pictures synchronously; two, take each CCD camera The images of the images are sent into the computer respectively, and the instantaneous linear displacement of the paper tape 2 at the corresponding position of each CCD camera is calculated respectively; 3. According to the instantaneous linear displacement of the paper tape 2 at the corresponding position of each CCD camera, the instantaneous change of the steam is calculated. Speed ​​increment or twist angle increment of wheel generator shaft 1.

[0017] The pattern on the paper tape 2 is a plurality of black stripes 2-1 with a certai...

specific Embodiment approach 2

[0019] Embodiment 2: The difference between this embodiment and Embodiment 1 is that in step 2, a generalized correlation delay estimator based on adaptive technology is used to calculate the instantaneous displacement. The displacement can be regarded as the delay on the position coordinate axis, so the calculation method of the displacement adopts the generalized correlation delay estimator based on the adaptive technology. The generalized correlation delay estimator is calculated by using the overall information of the image signal, so that a higher signal-to-noise ratio can be obtained, and the requirements for image clarity and focus are relatively low. After adding adaptive technology, the estimator can adapt to the time-varying measurement environment. The calculation process of this estimator is an iterative process, and the iterative algorithm is as follows:

[0020] ε(k)=x 2 (k)-y(k)

[0021] y ( k ...

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Abstract

The present invention relates to a turbine generator unit torsion vibration measuring method based on CCD image pick-up technique. Said method includes the following steps: (1), using several CCD cameras to respectively shoot the paper tapes with pattern which are positioned in the front of their lenses and stuck on the different positions on the shaft length of turbine generator, and making all the cameras synchronously shoot; (2), respectively feeding the image shot by every camera into computer and respectively calculating instantaneous linear displacement of paper tape of every camera correspondent position; and (3), utilizing the above-mentioned linear displacement to calculate the instantaneously changed turbine generator shaft rotating speed increment and torsion increment. Said method can be used in torsion vibration monitoring and control system of turbine-generator unit shaft.

Description

technical field [0001] The invention relates to a method for measuring the torsional vibration of the shaft system of a steam turbine generator set. Background technique [0002] With the development of the electric power industry, the single-unit capacity of the turbo-generator set is becoming larger and larger. In my country, 600MW thermal power units and 900MW nuclear power units have been put into operation. In order to increase the capacity of a single unit, a large steam turbine adopts a structure in which multi-stage cylinders are arranged in series, and the shaft system is composed of multiple rotors, which are more than 30 to 40 meters long and are an extremely complex flexible body. When the electromechanical disturbance causes the balance relationship between the driving torque of the steam turbine and the electromagnetic braking torque of the generator to be destroyed, the flexible shafting will produce relative torsional vibration superimposed on the overall ro...

Claims

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Application Information

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IPC IPC(8): G01M1/16G01M7/00
Inventor 徐敏强王日新高晶波高欣邢海燕
Owner HARBIN INST OF TECH
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