CN116929230A - Engine clearance detection method and system - Google Patents
Engine clearance detection method and system Download PDFInfo
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- CN116929230A CN116929230A CN202210338806.6A CN202210338806A CN116929230A CN 116929230 A CN116929230 A CN 116929230A CN 202210338806 A CN202210338806 A CN 202210338806A CN 116929230 A CN116929230 A CN 116929230A
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- 238000001514 detection method Methods 0.000 title claims abstract description 94
- 238000004088 simulation Methods 0.000 claims abstract description 69
- 230000000007 visual effect Effects 0.000 claims description 16
- 238000000034 method Methods 0.000 claims description 11
- 238000005259 measurement Methods 0.000 claims description 9
- 238000004364 calculation method Methods 0.000 claims description 5
- 238000001839 endoscopy Methods 0.000 claims 1
- 238000005498 polishing Methods 0.000 description 8
- 238000010586 diagram Methods 0.000 description 2
- 239000000446 fuel Substances 0.000 description 2
- 238000009434 installation Methods 0.000 description 2
- 238000000691 measurement method Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
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- 238000010276 construction Methods 0.000 description 1
- 230000014509 gene expression Effects 0.000 description 1
- 238000005286 illumination Methods 0.000 description 1
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
- G01B11/00—Measuring arrangements characterised by the use of optical techniques
- G01B11/14—Measuring arrangements characterised by the use of optical techniques for measuring distance or clearance between spaced objects or spaced apertures
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Abstract
The application provides an engine clearance detection method and system, comprising the following steps: constructing a simulated engine casing and a simulated engine impeller, setting the distance between the simulated engine casing and the simulated engine impeller as a known distance, and constructing a first simulated guide rail along the simulated engine casing; the binocular vision system moves to the position of the simulated engine impeller along the first simulated guide rail to measure the distance between the simulated engine casing and the simulated engine impeller, and the calibration of the binocular vision system is completed according to whether the difference between the measured distance and the known distance is in a set error range or not; and constructing a first actual guide rail on the actual engine casing according to the relative position relation between the first simulation guide rail and the simulation engine casing, and completing the selection of the binocular vision system according to whether the distance between the impeller to be detected and the adjacent impeller is within the range of the set impeller distance threshold value. By applying the technical scheme of the application, the technical problem that the engine clearance under the shielding condition cannot be measured in the prior art is solved.
Description
Technical Field
The application relates to the technical field of length measurement, in particular to an engine clearance detection method and system.
Background
Because the engine structure is very complicated, the clearance that needs detection and calibration is generally more concealed, can't directly use precision measurement instrument, electron feeler gauge, can't directly use novel sensor etc. to carry out engine assembly clearance detection and calibration yet. Therefore, an engine gap detection device based on the direct and side-to-side binocular endoscopic principle needs to be studied, and gap detection and calibration under the shielding condition can be completed without disassembling an engine.
Disclosure of Invention
The application provides an engine clearance detection method and system, which can solve the technical problem that the engine clearance under the shielding condition cannot be measured in the prior art.
According to an aspect of the present application, there is provided an engine gap detection method based on a direct and side binocular endoscopic principle, the engine gap detection method comprising: constructing a simulated engine casing and a simulated engine impeller, wherein the simulated engine casing has the same structure as the actual engine casing, the simulated engine impeller has the same structure as the actual engine impeller, the distance between the simulated engine casing and the simulated engine impeller is set to be a known distance, a first simulated guide rail is constructed along the simulated engine casing, a binocular vision system can move along the first simulated guide rail, and the binocular vision system comprises a straight binocular vision unit and a sideways binocular vision unit; the binocular vision system moves to the position of the simulated engine impeller along the first simulated guide rail to measure the distance between the simulated engine casing and the simulated engine impeller, and when the difference value between the distance between the simulated engine casing and the simulated engine impeller, which is measured by the binocular vision system, and the known distance is within a set error range, the calibration of the binocular vision system is completed; constructing a first actual guide rail on an actual engine casing according to the relative position relation between the first simulation guide rail and the simulation engine casing, judging whether the distance between the impeller to be detected and the adjacent impeller is within a set impeller distance threshold range, selecting a lateral binocular vision unit as a binocular vision system when the distance between the impeller to be detected and the adjacent impeller is within the set impeller distance threshold range, and selecting a straight binocular vision unit as the binocular vision system when the distance between the impeller to be detected and the adjacent impeller is beyond the set impeller distance threshold range; the binocular vision system moves to the impeller to be measured along the first actual guide rail to measure the distance between the impeller to be measured and the actual engine casing, and detection of the engine clearance is completed.
Further, a second simulation guide rail is built along the simulation engine case, the front projection light source moves along the first simulation guide rail to polish the front surface of the binocular vision system, and the rear projection light source moves along the second simulation guide rail to polish the back surface of the binocular vision system; and constructing a second actual guide rail on the actual engine case according to the relative position relation between the second simulation guide rail and the simulation engine case, moving the front projection source along the first actual guide rail to perform front surface polishing on the binocular vision system, and moving the rear projection source along the second actual guide rail to perform back surface polishing on the binocular vision system.
According to still another aspect of the present application, there is provided an engine gap detection system based on the direct and side binocular endoscopic principle, which performs engine gap detection using the engine gap detection method as described above.
Further, the engine clearance detection system includes: the simulated engine casing and the simulated engine impeller have the same structure as the actual engine casing, the simulated engine impeller is the same as the actual engine impeller, and the distance between the simulated engine casing and the simulated engine impeller is a known distance; the first simulation guide rail is arranged on the simulation engine case; the binocular vision system can move along the first simulation guide rail and comprises a straight binocular vision unit and a sideways binocular vision unit; the visual calibration unit is used for calibrating the binocular vision system according to the difference value between the distance between the simulated engine casing and the simulated engine impeller and the known distance, which are measured by the binocular vision system; the relative positions of the first actual guide rail and the actual engine casing are consistent with the relative positions of the first simulation guide rail and the simulation engine casing; the visual selection unit is used for selecting a direct binocular visual unit or a side binocular visual unit as a binocular visual system according to whether the distance between the impeller to be detected and the adjacent impeller is in a set impeller distance threshold range; and the gap detection unit is used for completing the distance measurement between the impeller to be detected and the actual engine casing according to the distance image between the impeller to be detected and the actual engine casing, which is shot by the binocular vision system moving to the impeller to be detected along the first actual guide rail.
Further, when the distance between the impeller to be detected and the adjacent impeller is within the set impeller distance threshold range, the visual selection unit selects the lateral binocular visual unit as a binocular visual system, and when the distance between the impeller to be detected and the adjacent impeller exceeds the set impeller distance threshold range, the visual selection unit selects the direct binocular visual unit as the binocular visual system.
Further, the engine clearance detection system further includes: the second simulation guide rail is arranged on the simulation engine case; the relative positions of the second actual guide rail and the actual engine casing are consistent with the relative positions of the second simulation guide rail and the simulation engine casing; the positive light projection source moves along the first simulation guide rail to perform front lighting on the binocular vision system, and moves along the first actual track to perform front lighting on the binocular vision system; and the rear projection light source moves along the second simulation guide rail to backlight the binocular vision system, and moves along the second actual guide rail to backlight the binocular vision system.
Further, the gap detection unit comprises an engine gap parameter module and an ROI three-dimensional data processing module, wherein the engine gap parameter module is used for setting camera parameters, and the ROI three-dimensional data processing module is used for carrying out binocular computation on images acquired by the binocular vision system based on the set camera parameters so as to extract ROI data and complete gap computation according to the ROI data.
Further, the camera parameters include object distance, focal length, distortion, camera distance, and angle.
Further, the gap detection unit further comprises an engine gap detection statistical module, and the engine gap detection statistical module is used for collecting and storing the engine gap.
By applying the technical scheme of the application, the application provides an engine clearance detection method based on a direct and sideways binocular endoscopic principle. The engine clearance detection method provided by the application can detect the clearance in the narrow space in the engine, and can realize high-precision detection of the size of the clearance in the engine which cannot be reached by the conventional means. Compared with the prior art, the application can avoid disassembling the engine to directly detect the size of the internal clearance of the engine with high precision.
Drawings
The accompanying drawings, which are included to provide a further understanding of embodiments of the application and are incorporated in and constitute a part of this specification, illustrate embodiments of the application and together with the description serve to explain the principles of the application. It is evident that the drawings in the following description are only some embodiments of the present application and that other drawings may be obtained from these drawings without inventive effort for a person of ordinary skill in the art.
FIG. 1 illustrates a block diagram of an engine clearance detection system provided in accordance with a specific embodiment of the present application;
fig. 2 shows a schematic installation diagram of an impeller to be tested, a first guide rail and an engine casing according to an embodiment of the present application;
FIG. 3 illustrates an installation schematic of a front projection light source, an impeller to be tested, and a rear projection light source provided in accordance with an embodiment of the present application;
FIG. 4 illustrates a schematic composition of an engine clearance data processing system based on binocular three-dimensional detection provided in accordance with a specific embodiment of the present application.
Wherein the above figures include the following reference numerals:
10. an impeller; 20. a casing; 30. a forward light source; 40. a rear projection light source.
Detailed Description
It should be noted that, without conflict, the embodiments of the present application and features of the embodiments may be combined with each other. The following description of the embodiments of the present application will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present application, but not all embodiments. The following description of at least one exemplary embodiment is merely exemplary in nature and is in no way intended to limit the application, its application, or uses. All other embodiments, which can be made by those skilled in the art based on the embodiments of the application without making any inventive effort, are intended to be within the scope of the application.
It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of exemplary embodiments according to the present application. As used herein, the singular is also intended to include the plural unless the context clearly indicates otherwise, and furthermore, it is to be understood that the terms "comprises" and/or "comprising" when used in this specification are taken to specify the presence of stated features, steps, operations, devices, components, and/or combinations thereof.
The relative arrangement of the components and steps, numerical expressions and numerical values set forth in these embodiments do not limit the scope of the present application unless it is specifically stated otherwise. Meanwhile, it should be understood that the sizes of the respective parts shown in the drawings are not drawn in actual scale for convenience of description. Techniques, methods, and apparatus known to one of ordinary skill in the relevant art may not be discussed in detail, but should be considered part of the specification where appropriate. In all examples shown and discussed herein, any specific values should be construed as merely illustrative, and not a limitation. Thus, other examples of the exemplary embodiments may have different values. It should be noted that: like reference numerals and letters denote like items in the following figures, and thus once an item is defined in one figure, no further discussion thereof is necessary in subsequent figures.
As shown in fig. 1 to 4, according to an embodiment of the present application, there is provided an engine gap detection method based on a direct and side binocular endoscopic principle, the engine gap detection method including: constructing a simulated engine casing and a simulated engine impeller, wherein the simulated engine casing has the same structure as the actual engine casing, the simulated engine impeller has the same structure as the actual engine impeller, the distance between the simulated engine casing and the simulated engine impeller is set to be a known distance, a first simulated guide rail is constructed along the simulated engine casing, a binocular vision system can move along the first simulated guide rail, and the binocular vision system comprises a straight binocular vision unit and a sideways binocular vision unit; the binocular vision system moves to the position of the simulated engine impeller along the first simulated guide rail to measure the distance between the simulated engine casing and the simulated engine impeller, and when the difference value between the distance between the simulated engine casing and the simulated engine impeller, which is measured by the binocular vision system, and the known distance is within a set error range, the calibration of the binocular vision system is completed; constructing a first actual guide rail on an actual engine casing according to the relative position relation between the first simulation guide rail and the simulation engine casing, judging whether the distance between the impeller 10 to be tested and the adjacent impeller is within a set impeller distance threshold range, selecting a lateral binocular vision unit as a binocular vision system when the distance between the impeller to be tested and the adjacent impeller is within the set impeller distance threshold range, and selecting a straight binocular vision unit as the binocular vision system when the distance between the impeller to be tested and the adjacent impeller is beyond the set impeller distance threshold range; the binocular vision system moves to the impeller to be measured along the first actual guide rail to measure the distance between the impeller to be measured and the actual engine casing 20, and detection of the engine clearance is completed.
By applying the configuration mode, the engine clearance detection method based on the direct and side binocular endoscopic principle is provided, the method comprises the steps of constructing a simulated engine impeller and a simulated engine casing, arranging a first simulated guide rail on the simulated engine casing, constructing a first actual guide rail on an actual engine casing according to the relative position relation between the first simulated guide rail and the simulated engine casing, selecting a proper binocular vision unit as a binocular vision system according to whether the distance between an impeller to be detected and an adjacent impeller is in a set impeller distance threshold range, and finishing the detection of the engine clearance by utilizing the binocular vision system. The engine clearance detection method provided by the application can detect the clearance in the narrow space in the engine, and can realize high-precision detection of the size of the clearance in the engine which cannot be reached by the conventional means. Compared with the prior art, the application can avoid disassembling the engine to directly detect the size of the internal clearance of the engine with high precision. The engine clearance measurement method provided by the application has certain universality and can be also used for clearance sizes of other scenes.
Specifically, in the application, a series of interval values exist between the impeller to be measured and the actual engine casing, and the interval to be measured in the application is the minimum interval value between the impeller to be measured and the actual engine casing. In practical situations, a plurality of impellers are usually present in the engine casing, and the distance between any two adjacent impellers is usually smaller, so when the binocular vision system is selected, a proper binocular vision unit needs to be selected as the binocular vision system according to the distance between the impeller to be detected and the adjacent impellers. The binocular vision system commonly used in the prior art comprises a direct binocular vision unit and a sideways binocular vision unit, the accuracy of the direct binocular vision unit is higher, the number of selectable lenses is more, but the required measurement space is larger, and the sideways binocular vision unit can take pictures of objects in a smaller space relative to the direct binocular vision unit, so that when the distance between an impeller to be measured and an adjacent impeller is within a set impeller distance threshold range, the sideways binocular vision unit is selected as the binocular vision system, and when the distance between the impeller to be measured and the adjacent impeller exceeds the set impeller distance threshold range, the direct binocular vision unit is selected as the binocular vision system.
In addition, in the application, by constructing the simulated engine casing and the simulated engine impeller, the distance between the simulated engine casing and the simulated engine impeller is a known distance, the binocular vision system moves to the simulated engine impeller along the first simulated guide rail to measure the distance between the simulated engine casing and the simulated engine impeller, and the comparison between the distance measured by the binocular vision system and the known distance can realize the calibration of the binocular vision system. When the difference between the distance measured by the binocular vision system and the known distance exceeds the set error range, the binocular vision system is considered to have errors in shooting, and recalibration is needed until the difference between the distance measured by the binocular vision system and the known distance is in the set error range, so that calibration of the binocular vision system is completed. According to the method, before the interval between the impeller to be measured and the engine casing is actually measured, the binocular vision system is calibrated, and the gap measurement accuracy is prevented from being influenced by errors of the binocular vision system.
Furthermore, by constructing the first simulation guide rail along the simulation engine casing, the binocular vision system can move along the first simulation guide rail, and the position of the first simulation guide rail on the simulation engine casing and the setting length of the first simulation guide rail can be accurately obtained in such a way, so that a reference basis is provided for the construction of the first actual guide rail on the actual engine casing. Because the position of the actual impeller to be detected on the actual engine casing is hidden, the position of the first actual guide rail on the engine casing cannot be directly known, and whether the first actual guide rail can accurately reach the actual impeller to be detected cannot be confirmed, the first actual guide rail is constructed on the actual engine casing according to the position of the first simulation guide rail on the simulation engine casing, so that the binocular vision system can accurately reach the position of the impeller to be detected along the first actual guide rail, and the measurement of the distance between the impeller to be detected and the engine casing is completed.
Further, in the application, because the position between the impeller to be tested and the engine casing is hidden, in order to overcome the influence of background stray light and improve the shooting definition when shooting, a second simulation guide rail can be constructed along the simulation engine casing, the front projection light source 30 moves along the first simulation guide rail to light the front surface of the binocular vision system, and the rear projection light source 40 moves along the second simulation guide rail to light the back surface of the binocular vision system; and constructing a second actual guide rail on the actual engine casing according to the relative position relation between the second simulated guide rail and the simulated engine casing, moving the front projection light source 30 along the first actual guide rail to perform front surface polishing on the binocular vision system, and moving the rear projection light source 40 along the second actual guide rail to perform back surface polishing on the binocular vision system.
Under this kind of configuration mode, through setting up forward projection light source and rear projection light source, need through binocular vision system real-time observation surrounding environment in the removal in-process, because the inside comparatively dark of engine, need illumination to guarantee to arrive the detection position safely. In the moving process, the forward projection light source can perform forward lighting along the first guide rail on the engine casing in the moving process of the binocular vision system, at the moment, the binocular vision system does not take a picture, after the impeller to be detected is reached, the forward projection light source is turned off, the rear projection light source is turned on, at the moment, the influence of the environment background on the definition of a shot image can be shielded, and then the accuracy of gap measurement is improved.
According to the engine clearance detection system based on the direct and side binocular endoscopic principle, the engine clearance detection method is used for engine clearance detection.
By applying the configuration mode, the engine clearance detection system based on the direct and side binocular endoscopic principle is provided, the system comprises the simulated engine impeller and the simulated engine casing, a first simulated guide rail is arranged on the simulated engine casing, a first actual guide rail is constructed on the actual engine casing according to the relative position relation between the first simulated guide rail and the simulated engine casing, a proper binocular vision unit is selected to serve as a binocular vision system according to whether the distance between the impeller to be detected and the adjacent impeller is in a set impeller distance threshold range, and the binocular vision system is utilized to finish the detection of the engine clearance. The engine clearance detection system provided by the application can detect the clearance in a narrow space in an engine, and can realize high-precision detection of the size of the clearance in the engine which cannot be reached by conventional means. Compared with the prior art, the application can avoid disassembling the engine to directly detect the size of the internal clearance of the engine with high precision.
Further, in order to complete detection of an engine clearance, the engine clearance detection system comprises a simulated engine casing, a simulated engine impeller, a first simulated guide rail, a binocular vision system, a vision calibration unit, a first actual guide rail, a vision selection unit and a clearance detection unit, wherein the simulated engine casing and the actual engine casing are identical in structure, the simulated engine impeller and the actual engine impeller are identical, the distance between the simulated engine casing and the simulated engine impeller is a known distance, the first simulated guide rail is arranged on the simulated engine casing, the binocular vision system can move along the first simulated guide rail, the binocular vision system comprises a straight binocular vision unit and a sideways binocular vision unit, the vision calibration unit is used for calibrating the binocular vision system according to the difference between the distance between the simulated engine casing and the simulated engine impeller measured by the binocular vision system, the relative position between the first actual guide rail and the actual engine casing is consistent with the relative position between the first simulated guide rail and the simulated engine casing, the vision selection unit is used for selecting the straight binocular vision unit or the sideways binocular vision unit as an image to be measured between the binocular vision unit and the actual engine impeller to be measured according to whether the distance between the impellers to be measured and the adjacent impellers is in a set distance threshold range, and the distance between the binocular vision unit and the actual engine impeller to be measured is used for photographing the distance between the binocular vision unit and the actual impeller and the actual casing.
Further, in the present application, the binocular vision system commonly used in the prior art includes a direct binocular vision unit and a sideways binocular vision unit, the direct binocular vision unit usually requires a larger space when photographing, and the sideways binocular vision unit can photograph an object in a smaller space relative to the direct binocular vision unit, so when the distance between the impeller to be measured and the adjacent impeller is within the set impeller distance threshold range, the vision selection unit selects the sideways binocular vision unit as the binocular vision system, and when the distance between the impeller to be measured and the adjacent impeller exceeds the set impeller distance threshold range, the vision selection unit selects the direct binocular vision unit as the binocular vision system.
In addition, in the application, because the position between the impeller to be tested and the engine casing is hidden, in order to overcome the influence of background stray light and improve shooting definition when shooting, the engine clearance detection system can be configured to further comprise a second simulation guide rail, a second actual guide rail, a front projection light source and a rear projection light source, wherein the second simulation guide rail is arranged on the simulation engine casing, the relative position of the second actual guide rail and the actual engine casing is consistent with the relative position of the second simulation guide rail and the simulation engine casing, the front projection light source moves along the first simulation guide rail to light the front surface of the binocular vision system, the front projection light source moves along the first actual guide rail to light the front surface of the binocular vision system, the rear projection light source moves along the second simulation guide rail to light the back surface of the binocular vision system, and the rear projection light source moves along the second actual guide rail to light the back surface of the binocular vision system.
Further, in the present application, in order to complete the detection of the engine clearance, the clearance detection unit may be configured to include an engine clearance parameter module for setting camera parameters and an ROI three-dimensional data processing module for performing binocular computation on an image acquired by the binocular vision system based on the set camera parameters to extract ROI data and complete the calculation of the clearance according to the ROI data. In particular, the camera parameters include object distance, focal length, distortion, camera distance, and angle.
In addition, in the present application, in order to evaluate the engine performance, the gap detection unit may be configured to further include an engine gap detection statistics module for collecting and saving the engine gap. The engine clearance detection statistical module inputs the detection result into an engine clearance detection database for big data application of the correlation detection of the engine clearance and the engine performance in the later period, so that the correlation detection of the thrust, the fuel consumption and the like of the engine can be carried out.
For further understanding of the present application, the following detailed description of the engine clearance detection system and method based on the principle of direct and sideways binocular endoscopic is provided with reference to fig. 1 to 4.
As shown in fig. 1 to fig. 4, according to a specific embodiment of the present application, there is provided an engine gap detection system based on a direct and sideways binocular endoscopic principle, the engine gap detection system includes a simulated engine casing, a simulated engine impeller, a first simulated guide rail, a first actual guide rail, a second simulated guide rail, a second actual guide rail, an engine gap detection dedicated direct and sideways binocular endoscopic lens, a lens guide rail steerable lens control system, an engine gap detection dedicated forward and sideways binocular endoscopic lens including a binocular vision system, a lens guide rail steerable lens control system being a vision selection unit, the lens guide rail steerable lens control system being configured to select a direct binocular vision unit or a sideways binocular vision unit as a binocular vision system according to whether a distance between an impeller to be detected and an adjacent impeller is within a set impeller distance threshold range, the engine gap detection dedicated forward and sideways binocular endoscopic lens system including a forward projection light source and a light source, the engine gap data processing system including a binocular precision module and a gap detection unit, i.e., a binocular precision calibration module is implemented by calibrating the binocular vision unit to the binocular vision unit according to a difference between the simulated impeller and the simulated impeller distance between the simulated binocular vision unit and the engine casing. And the gap detection unit completes the distance measurement between the impeller to be detected and the actual engine casing according to the distance image between the impeller to be detected and the actual engine casing shot by the binocular vision system moving to the impeller to be detected along the first actual guide rail.
In the application, the gap detection unit comprises an engine gap parameter module, an ROI three-dimensional data processing module and an engine gap detection statistical module, wherein the engine gap parameter module is used for setting parameters such as object distance, focal length, distortion, camera distance, angle and the like, setting internal parameters and external parameters of a binocular camera, laying a foundation for subsequent gap calculation, and the ROI three-dimensional data processing module is used for carrying out binocular calculation on acquired images and extracting ROI data and gap calculation according to a synthesized three-dimensional depth image and the actual position of an engine gap. The engine clearance detection and statistics module is used for collecting and storing engine clearances. The engine clearance detection statistical module inputs the detection result into an engine clearance detection database for big data application of the correlation detection of the engine clearance and the engine performance in the later period, so that the correlation detection of the thrust, the fuel consumption and the like of the engine can be carried out.
In this embodiment, the engine clearance detection specifically includes the following steps.
The method comprises the steps of constructing a simulated engine casing and a simulated engine impeller, wherein the simulated engine casing and the actual engine casing are identical in structure, the simulated engine impeller and the actual engine impeller are identical in structure, the distance between the simulated engine casing and the simulated engine impeller is set to be a known distance, a first simulated guide rail is constructed along the simulated engine casing, a binocular vision system can move along the first simulated guide rail, and the binocular vision system comprises a straight binocular vision unit and a sideways binocular vision unit.
And the binocular vision system moves to the simulated engine impeller along the first simulated guide rail to measure the distance between the simulated engine casing and the simulated engine impeller, and when the difference value between the distance between the simulated engine casing and the simulated engine impeller, which is measured by the binocular vision system, and the known distance is within a set error range, the calibration of the binocular vision system is completed.
And constructing a first actual guide rail on the actual engine casing according to the relative position relation between the first simulation guide rail and the simulation engine casing, judging whether the distance between the impeller to be tested and the adjacent impeller is within a set impeller distance threshold range, selecting a lateral binocular vision unit as a binocular vision system when the distance between the impeller to be tested and the adjacent impeller is within the set impeller distance threshold range, and selecting a straight binocular vision unit as the binocular vision system when the distance between the impeller to be tested and the adjacent impeller is beyond the set impeller distance threshold range.
Constructing a second simulation guide rail along the simulation engine case, moving a front projection source along the first simulation guide rail to perform front surface polishing on the binocular vision system, and moving a rear projection source along the second simulation guide rail to perform back surface polishing on the binocular vision system; and constructing a second actual guide rail on the actual engine case according to the relative position relation between the second simulation guide rail and the simulation engine case, moving the front projection source along the first actual guide rail to perform front surface polishing on the binocular vision system, and moving the rear projection source along the second actual guide rail to perform back surface polishing on the binocular vision system.
The binocular vision system moves to the impeller to be measured along the first actual guide rail to measure the distance between the impeller to be measured and the actual engine casing, and detection of the engine clearance is completed.
In summary, an engine clearance detection method and system based on a direct and side binocular endoscopic principle are provided, the method comprises the steps of constructing a simulated engine impeller and a simulated engine casing, arranging a first simulated guide rail on the simulated engine casing, constructing a first actual guide rail on an actual engine casing according to the relative position relation between the first simulated guide rail and the simulated engine casing, selecting a proper binocular vision unit as a binocular vision system according to whether the distance between an impeller to be detected and an adjacent impeller is in a set impeller distance threshold range, and completing detection of an engine clearance by utilizing the binocular vision system. The engine clearance detection method provided by the application can detect the clearance in the narrow space in the engine, and can realize high-precision detection of the size of the clearance in the engine which cannot be reached by the conventional means. Compared with the prior art, the application can avoid disassembling the engine to directly detect the size of the internal clearance of the engine with high precision. The engine clearance measurement method provided by the application has certain universality and can be also used for clearance sizes of other scenes.
Spatially relative terms, such as "above … …," "above … …," "upper surface at … …," "above," and the like, may be used herein for ease of description to describe one device or feature's spatial location relative to another device or feature as illustrated in the figures. It will be understood that the spatially relative terms are intended to encompass different orientations in use or operation in addition to the orientation depicted in the figures. For example, if the device in the figures is turned over, elements described as "above" or "over" other devices or structures would then be oriented "below" or "beneath" the other devices or structures. Thus, the exemplary term "above … …" may include both orientations of "above … …" and "below … …". The device may also be positioned in other different ways (rotated 90 degrees or at other orientations) and the spatially relative descriptors used herein interpreted accordingly.
In addition, the terms "first", "second", etc. are used to define the components, and are only for convenience of distinguishing the corresponding components, and the terms have no special meaning unless otherwise stated, and therefore should not be construed as limiting the scope of the present application.
The above description is only of the preferred embodiments of the present application and is not intended to limit the present application, but various modifications and variations can be made to the present application by those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application should be included in the protection scope of the present application.
Claims (9)
1. An engine clearance detection method based on a direct and side binocular endoscopic principle is characterized by comprising the following steps of:
the method comprises the steps of constructing a simulated engine casing and a simulated engine impeller, wherein the simulated engine casing has the same structure as an actual engine casing, the simulated engine impeller has the same structure as the actual engine impeller, the distance between the simulated engine casing and the simulated engine impeller is set to be a known distance, a first simulated guide rail is constructed along the simulated engine casing, a binocular vision system can move along the first simulated guide rail, and the binocular vision system comprises a straight binocular vision unit and a sideways binocular vision unit;
the binocular vision system moves to the simulated engine impeller along the first simulated guide rail to measure the distance between the simulated engine casing and the simulated engine impeller, and when the difference between the distance between the simulated engine casing and the simulated engine impeller, measured by the binocular vision system, and the known distance is within a set error range, the calibration of the binocular vision system is completed;
constructing a first actual guide rail on an actual engine casing according to the relative position relation between the first simulation guide rail and the simulation engine casing, judging whether the distance between an impeller to be detected and an adjacent impeller is within a set impeller distance threshold range, selecting a lateral binocular vision unit as a binocular vision system when the distance between the impeller to be detected and the adjacent impeller is within the set impeller distance threshold range, and selecting a straight binocular vision unit as the binocular vision system when the distance between the impeller to be detected and the adjacent impeller exceeds the set impeller distance threshold range; and the binocular vision system moves to the impeller to be measured along the first actual guide rail to measure the distance between the impeller to be measured and the actual engine casing, so that the detection of the engine clearance is completed.
2. The engine clearance detection method based on the direct and sideways binocular endoscopic principle according to claim 1, wherein a second simulation guide rail is constructed along the simulation engine case, a forward projection light source moves along the first simulation guide rail to light the front surface of the binocular vision system, and a rear projection light source moves along the second simulation guide rail to light the back surface of the binocular vision system; and constructing a second actual guide rail on the actual engine case according to the relative position relation between the second simulation guide rail and the simulation engine case, wherein a front projection light source moves along the first actual guide rail to light the front surface of the binocular vision system, and a rear projection light source moves along the second actual guide rail to light the back surface of the binocular vision system.
3. An engine clearance detection system based on a direct and side-by binocular endoscopic principle, which is characterized in that the engine clearance detection system based on the direct and side-by binocular endoscopic principle uses the engine clearance detection method as claimed in claim 1 or 2 to perform engine clearance detection.
4. The engine gap detection system based on the direct and sideways binocular endoscopic principle of claim 3, wherein the engine gap detection system comprises:
the simulated engine casing and the simulated engine impeller have the same structure as the actual engine casing, the simulated engine impeller is the same as the actual engine impeller, and the distance between the simulated engine casing and the simulated engine impeller is a known distance;
the first simulation guide rail is arranged on the simulation engine casing;
the binocular vision system can move along the first simulation guide rail and comprises a straight binocular vision unit and a sideways binocular vision unit;
the visual calibration unit is used for calibrating the binocular vision system according to the difference value between the distance between the simulated engine casing and the simulated engine impeller and the known distance, which are measured by the binocular vision system;
the relative position of the first actual guide rail and the actual engine casing is consistent with the relative position of the first simulation guide rail and the simulation engine casing;
the visual selection unit is used for selecting a direct binocular visual unit or a side binocular visual unit as a binocular visual system according to whether the distance between the impeller to be detected and the adjacent impeller is in a set impeller distance threshold range;
and the gap detection unit is used for completing the distance measurement between the impeller to be detected and the actual engine casing according to the distance image between the impeller to be detected and the actual engine casing shot by the binocular vision system which moves to the impeller to be detected along the first actual guide rail.
5. The engine clearance detection system based on the direct and sideways binocular endoscopic principle according to claim 4, wherein when the distance between the impeller to be detected and the adjacent impeller is within a set impeller distance threshold range, the vision selection unit selects a sideways binocular vision unit as a binocular vision system, and when the distance between the impeller to be detected and the adjacent impeller exceeds the set impeller distance threshold range, the vision selection unit selects a direct binocular vision unit as a binocular vision system.
6. The engine gap detection system based on the direct and sideways binocular endoscopic principle of claim 5, further comprising:
the second simulation guide rail is arranged on the simulation engine casing;
the relative position of the second actual guide rail and the actual engine casing is consistent with the relative position of the second simulation guide rail and the simulation engine casing;
the positive light projection source moves along the first simulation guide rail to perform front lighting on the binocular vision system, and moves along the first actual track to perform front lighting on the binocular vision system;
the rear projection light source moves along the second simulation guide rail to perform back lighting on the binocular vision system, and moves along the second actual guide rail to perform back lighting on the binocular vision system.
7. The engine clearance detection system based on the direct and sideways binocular endoscopic principle according to claim 4, wherein the clearance detection unit comprises an engine clearance parameter module for setting camera parameters and an ROI three-dimensional data processing module for performing binocular computation on images acquired by the binocular vision system based on the set camera parameters to extract ROI data and complete calculation of clearance according to the ROI data.
8. The system for detecting engine clearance based on the principle of direct and sideways binocular endoscopy of claim 7, wherein the camera parameters include object distance, focal length, distortion, camera distance and angle.
9. The engine clearance detection system based on the direct and sideways binocular endoscopic principle of claim 7, wherein the clearance detection unit further comprises an engine clearance detection statistics module for collecting and preserving engine clearance.
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