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Blade tip gap measuring device, system and method based on endoscope and linear structured light

A technology of blade tip clearance and measuring device, which is applied to measuring devices, optical devices, instruments, etc., can solve the problems of poor measurement accessibility, high measurement accuracy requirements, and low operability, so as to meet the requirements of the measurement environment, The effect of reducing radial complexity

Pending Publication Date: 2021-01-29
BEIHANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The present invention solves the problem that the existing engine blade tip clearance measurement method has poor accessibility, low operability, and high measurement accuracy requirements for the complex structural environment in the assembled state of the aeroengine, and cannot fully reflect the blade after the actual assembly of the engine is completed. problems with sharp clearance situations,

Method used

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  • Blade tip gap measuring device, system and method based on endoscope and linear structured light
  • Blade tip gap measuring device, system and method based on endoscope and linear structured light
  • Blade tip gap measuring device, system and method based on endoscope and linear structured light

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specific Embodiment approach 1

[0043] Specific implementation mode 1. Combination figure 1 In this embodiment, the tip clearance measurement device based on the endoscope and the line structured light is used to realize the online measurement of the tip clearance of the aeroengine in the assembled state. The device includes a mounting tube 1, a side-view endoscope 2, a reflector 3, a reflector fixing device 4, a point light source emitter 5 and a wave lens 6;

[0044] The installation pipe 1 is used to install and position the tip clearance measuring device through the endoscope hole on the engine;

[0045] The side-viewing endoscope 2 is a cylinder as a whole, fixed on one end of the installation tube 1, and two openings are provided on the side to install a camera and an illumination device respectively; they are used for shooting and providing ambient light.

[0046] The point light source emitter 5 and the wave lens 6 form a line-structured light emitting device, and the light beam emitted by the point...

specific Embodiment approach 2

[0049] Specific embodiment two, combine Figure 2 to Figure 5 Describe this embodiment. This embodiment is the measurement system of the blade tip clearance measurement device based on the endoscope and line structured light described in the first embodiment, including the blade tip clearance measurement device described in the first embodiment, facing the endoscope The joint calibration module of mirror and line structured light measurement and the identification and calculation module of the sharp gap between leaves;

[0050] image 3 a is a schematic diagram of the engine endoscope hole (taking CFM56 as an example), using the existing endoscope hole 7 on the stator blade of the engine for measurement, the engine blade tip can be inspected without changing the engine design or destroying the engine structure. Gaps are measured.

[0051] image 3 In b: casing inner wall 8 , stator blade 9 , rotor blade 10 , the measurement area is the blade tip clearance area 11 , and the ...

specific Embodiment approach 3

[0063] Specific embodiment three, combine Figure 5 This embodiment is described. This embodiment is the measurement method of the blade tip clearance measurement system based on the endoscope and line structured light described in the second embodiment. The method is realized by the following steps:

[0064] S1: Install the blade tip clearance measurement device to the specified position inside the engine, ensure that the clearance position is within the working distance of the device, and try to ensure that the line structured light plane passes through the engine rotation axis.

[0065] S2: Collect the tip clearance image, and record the position of the engine rotation.

[0066] S3: Identify the line laser stripes formed where the line structured light irradiates the position of the blade tip gap.

[0067] S4: Judging whether there are two discontinuous line segments forming a certain angle with each other (an obtuse angle between 90-180 degrees), if it cannot be detected,...

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Abstract

The invention discloses a blade tip gap measuring device, system and method based on an endoscope and structured light, relates to the field of aero-engine assembly quality inspection and fault inspection, and aims to solve the problems of poor measurement accessibility, low operability, high measurement precision requirement and the like of a complex structure environment in a complete aero-engine assembly state. An existing endoscope observation hole in an aero-engine casing is used for dynamically measuring the blade tip clearance of an engine on line under the condition that the integrityof the engine is kept. The content realized by the measurement system comprises the steps: designing an endoscope and a linear structured light emitting device; developing a monocular camera and linear structured light oriented joint calibration module, and calibrating detection system parameters; and developing an image-based inter-blade tip clearance identification and calculation module, and identifying and calculating a blade tip clearance value. According to the invention, the measurement efficiency and measurement precision of the blade tip clearance can be greatly improved, and the blade tip clearance of the whole engine can be truly reflected; and a new measurement means is provided for engine assembly quality evaluation and fault diagnosis.

Description

technical field [0001] The invention relates to the field of aero-engine assembly quality inspection and fault inspection, in particular to a blade tip clearance measurement device, system and method based on an endoscope and line structured light. Background technique [0002] The rotor-stator blade tip clearance is an important index affecting the engine work. The size of the tip clearance directly affects the working state and final performance of the engine blades; at the same time, the tip clearance is also an important process parameter in the engine assembly process, reflecting the overall assembly quality of the engine. Therefore, the measurement of rotor-stator blade tip clearance during assembly and after assembly is an important means to control and evaluate the assembly level of the complete engine. [0003] In the field of engine blade tip clearance measurement, the general method is to measure the blade clearance of the last stage turbine or the first stage co...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01B11/14
CPCG01B11/14
Inventor 肖文磊徐茂程李瑾岳赵罡
Owner BEIHANG UNIV
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