CN113514353A - Crack monitoring equipment and test equipment for automobile fatigue test - Google Patents

Crack monitoring equipment and test equipment for automobile fatigue test Download PDF

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Publication number
CN113514353A
CN113514353A CN202110448884.7A CN202110448884A CN113514353A CN 113514353 A CN113514353 A CN 113514353A CN 202110448884 A CN202110448884 A CN 202110448884A CN 113514353 A CN113514353 A CN 113514353A
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China
Prior art keywords
test
crack
camera
light source
control unit
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CN202110448884.7A
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Chinese (zh)
Inventor
宋盈盈
翟龙
郝斌斌
刘强
尹志高
阿拉腾
房永伟
卢星星
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CITIC Dicastal Co Ltd
Luoyang CITIC Imaging Intelligent Technology Co Ltd
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CITIC Dicastal Co Ltd
Luoyang CITIC Imaging Intelligent Technology Co Ltd
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Application filed by CITIC Dicastal Co Ltd, Luoyang CITIC Imaging Intelligent Technology Co Ltd filed Critical CITIC Dicastal Co Ltd
Priority to CN202110448884.7A priority Critical patent/CN113514353A/en
Publication of CN113514353A publication Critical patent/CN113514353A/en
Priority to KR1020220044431A priority patent/KR102681065B1/en
Pending legal-status Critical Current

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    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N3/00—Investigating strength properties of solid materials by application of mechanical stress
    • G01N3/32—Investigating strength properties of solid materials by application of mechanical stress by applying repeated or pulsating forces
    • G01N3/36—Investigating strength properties of solid materials by application of mechanical stress by applying repeated or pulsating forces generated by pneumatic or hydraulic means
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
    • G01M17/00—Testing of vehicles
    • G01M17/007—Wheeled or endless-tracked vehicles
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
    • G01M5/00—Investigating the elasticity of structures, e.g. deflection of bridges or air-craft wings
    • G01M5/0033—Investigating the elasticity of structures, e.g. deflection of bridges or air-craft wings by determining damage, crack or wear
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
    • G01M99/00—Subject matter not provided for in other groups of this subclass
    • G01M99/007—Subject matter not provided for in other groups of this subclass by applying a load, e.g. for resistance or wear testing
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
    • G01N21/84—Systems specially adapted for particular applications
    • G01N21/88—Investigating the presence of flaws or contamination
    • G01N21/8806—Specially adapted optical and illumination features
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
    • G01N21/84—Systems specially adapted for particular applications
    • G01N21/88—Investigating the presence of flaws or contamination
    • G01N21/8851—Scan or image signal processing specially adapted therefor, e.g. for scan signal adjustment, for detecting different kinds of defects, for compensating for structures, markings, edges
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N3/00—Investigating strength properties of solid materials by application of mechanical stress
    • G01N3/02—Details
    • G01N3/06—Special adaptations of indicating or recording means
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N3/00—Investigating strength properties of solid materials by application of mechanical stress
    • G01N3/02—Details
    • G01N3/06—Special adaptations of indicating or recording means
    • G01N3/068—Special adaptations of indicating or recording means with optical indicating or recording means
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
    • G01N21/84—Systems specially adapted for particular applications
    • G01N21/88—Investigating the presence of flaws or contamination
    • G01N21/8851—Scan or image signal processing specially adapted therefor, e.g. for scan signal adjustment, for detecting different kinds of defects, for compensating for structures, markings, edges
    • G01N2021/8854—Grading and classifying of flaws
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
    • G01N21/84—Systems specially adapted for particular applications
    • G01N21/88—Investigating the presence of flaws or contamination
    • G01N21/8851—Scan or image signal processing specially adapted therefor, e.g. for scan signal adjustment, for detecting different kinds of defects, for compensating for structures, markings, edges
    • G01N2021/8854—Grading and classifying of flaws
    • G01N2021/888—Marking defects
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
    • G01N21/84—Systems specially adapted for particular applications
    • G01N21/88—Investigating the presence of flaws or contamination
    • G01N21/8851—Scan or image signal processing specially adapted therefor, e.g. for scan signal adjustment, for detecting different kinds of defects, for compensating for structures, markings, edges
    • G01N2021/8887—Scan or image signal processing specially adapted therefor, e.g. for scan signal adjustment, for detecting different kinds of defects, for compensating for structures, markings, edges based on image processing techniques
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
    • G01N2203/0001—Type of application of the stress
    • G01N2203/0005—Repeated or cyclic
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
    • G01N2203/003—Generation of the force
    • G01N2203/0042—Pneumatic or hydraulic means
    • G01N2203/0048—Hydraulic means
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
    • G01N2203/0058—Kind of property studied
    • G01N2203/006—Crack, flaws, fracture or rupture
    • G01N2203/0062—Crack or flaws
    • G01N2203/0064—Initiation of crack
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
    • G01N2203/0058—Kind of property studied
    • G01N2203/006—Crack, flaws, fracture or rupture
    • G01N2203/0062—Crack or flaws
    • G01N2203/0066—Propagation of crack
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
    • G01N2203/02—Details not specific for a particular testing method
    • G01N2203/06—Indicating or recording means; Sensing means
    • G01N2203/0641—Indicating or recording means; Sensing means using optical, X-ray, ultraviolet, infrared or similar detectors
    • G01N2203/0647—Image analysis

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  • Investigating Strength Of Materials By Application Of Mechanical Stress (AREA)

Abstract

The invention belongs to the technical field of automobile bench tests, and provides crack monitoring equipment and test equipment for an automobile fatigue test, wherein a camera shooting component comprises a camera, a light source and a bracket, the light source irradiates the surface of a test sample, the light source controller supplies power to the light source, the camera shoots the surface of the test sample, an industrial personal computer comprises a shooting control unit, a test load information acquisition unit, a photo information marking unit and a display control unit, the crack monitoring equipment can accurately monitor cracks generated by automobile chassis parts in the fatigue test process in real time, can shoot the crack photos generated by the tested sample at regular time, accurately monitor the whole process of crack initiation and expansion, the test equipment provided with the crack monitoring equipment can control the test to stop according to the length of the cracks, and accurately obtain the fatigue life of the tested sample, the crack condition of the tested sample can be monitored in real time on line without the limitation of people and working time, and the test efficiency is improved.

Description

Crack monitoring equipment and test equipment for automobile fatigue test
Technical Field
The application relates to the technical field of automobile bench tests, in particular to crack monitoring equipment and test equipment for automobile fatigue tests.
Background
In the whole vehicle development process, in order to verify the safety performance of the automobile chassis parts, the fatigue endurance test of the automobile chassis parts must be carried out. The number of fatigue test items and test samples required by automobile chassis parts is large, and the test period is long. The host computer factory can definitely stipulate that the length of the crack generated by the test sample is invalid when the length reaches a certain length value, the test needs to be stopped after the sample is invalid, and different host computer factories define different crack lengths for judging whether the sample is invalid or not. In the test process, the cracks generated in the test sample need to be monitored, and at present, a mode of manually and periodically checking the cracks is mostly adopted in a laboratory. The crack inspection work needs to consume a large amount of manpower and time cost, and meanwhile, the manual inspection cannot achieve the real-time monitoring of crack initiation and expansion, the test cannot be accurately stopped when the crack reaches the specified length, and usually certain misjudgment of sample fatigue life extension exists. At present, no mature crack monitoring system suitable for the fatigue test of automobile chassis parts exists in China.
Disclosure of Invention
The embodiment of the application provides crack monitoring equipment and test equipment for an automobile fatigue test, and solves the problems in the background art.
In order to achieve the purpose, the invention provides the following technical scheme:
the crack monitoring equipment for the automobile fatigue test comprises a light source controller, an industrial personal computer, a display and at least one camera shooting assembly, wherein the camera shooting assembly comprises a camera, a light source and a support, the camera and the light source are arranged together and are both arranged on the support, the light source irradiates the surface of a test sample, and the camera shoots the surface of the test sample; the light source controller is electrically connected with the light source and used for supplying power to the light source; the industrial personal computer is in signal connection with the camera and the display and comprises a photographing control unit, a test load information acquisition unit, a photo information labeling unit and a display control unit; the photographing control unit is used for controlling the camera to photograph; the test load information acquisition unit is used for acquiring test load loading information of an automobile fatigue test; the picture information marking unit is used for identifying cracks and crack lengths appearing in the pictures shot by the camera and marking crack positions, crack numbers, crack lengths, test load loading information and shooting time information in the pictures; the display control unit is used for controlling the display to display the marked photos.
In some embodiments, the light source controller further comprises a brightness adjustment module for adjusting the brightness of the light source.
In some embodiments, the photographing control unit can control the camera to start, stop, photographing interval, and exposure time.
In some embodiments, the industrial personal computer further comprises a storage unit, and the storage unit stores the picture taken by the camera and the picture labeled with the information.
In some embodiments, the camera is a fixed focus lens.
In some embodiments, the industrial personal computer further comprises a crack length comparison unit for comparing the identified crack length with a set length value.
In a second aspect, an embodiment of the present application provides an experimental apparatus for an automobile fatigue test, including a PLC control unit, an automobile chassis component hydraulic test system, and further including a crack monitoring apparatus for an automobile fatigue test described in any one of the above embodiments; the PLC control unit is in signal connection with the industrial personal computer and a controller of the automobile chassis part hydraulic test system; the industrial personal computer can acquire the test load loading information of the hydraulic test system of the automobile chassis part from the PLC control unit, and can control the hydraulic test system of the automobile chassis part to stop through the PLC control unit when the identified crack length is larger than a set length value.
Compared with the prior art, the invention has the beneficial effects that:
the invention provides crack monitoring equipment and test equipment for an automobile fatigue test, which comprise a light source controller, an industrial personal computer, a display and at least one camera shooting component, wherein the camera shooting component comprises a camera, a light source and a bracket, the light source irradiates the surface of a test sample, the light source controller supplies power to the light source, the camera shoots the surface of the test sample, the industrial personal computer comprises a shooting control unit, a test load information acquisition unit, a photo information marking unit and a display control unit, the crack monitoring equipment can accurately monitor cracks generated by automobile chassis parts in the fatigue test process in real time, can shoot crack photos generated by the tested sample at regular time and accurately monitor the whole process of crack initiation and expansion, the test equipment provided with the crack monitoring equipment can control the test to stop according to the length of the cracks and accurately obtain the fatigue life of the tested sample, the crack condition of the tested sample can be monitored in real time on line without the limitation of people and working time, and the test efficiency is improved.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed to be used in the description of the embodiments are briefly introduced below, and it is obvious that the drawings in the following description are some embodiments of the present application, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.
FIG. 1 is a schematic structural diagram of an intelligent crack monitoring system for a fatigue test of automobile chassis parts.
FIG. 2 is a schematic diagram of an industrial personal computer of the crack intelligent monitoring system for the automobile chassis part fatigue test.
FIG. 3 is a schematic structural diagram of a testing device for fatigue testing of automobile chassis parts according to the present application.
FIG. 4 is a schematic circuit diagram of a testing device for fatigue testing of automobile chassis parts according to the present application.
Detailed Description
The terms "first," "second," "third," and "fourth," etc. in the description and claims of this application and in the accompanying drawings are used for distinguishing between different objects and not for describing a particular order. Furthermore, the terms "include" and "have," as well as any variations thereof, are intended to cover non-exclusive inclusions. For example, a process, method, system, article, or apparatus that comprises a list of steps or elements is not limited to only those steps or elements listed, but may alternatively include other steps or elements not listed, or inherent to such process, method, article, or apparatus.
Reference herein to "an embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment can be included in at least one embodiment of the application. The appearances of the phrase in various places in the specification are not necessarily all referring to the same embodiment, nor are separate or alternative embodiments mutually exclusive of other embodiments. It is explicitly and implicitly understood by one skilled in the art that the embodiments described herein can be combined with other embodiments.
The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are some, but not all, embodiments of the present application. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
Example 1
In this embodiment 1, an intelligent crack monitoring system for an automobile chassis part fatigue test is provided, as shown in fig. 1, includes a light source controller, an industrial personal computer, a display, and at least one camera module. The number of the camera assemblies is selected according to the testing requirements of the fatigue test of the automobile chassis parts, and 3 camera assemblies are arranged in the embodiment (for example, in other embodiments, the number of the camera assemblies may be 1, 2, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13-72, and the like). Each camera shooting assembly comprises a camera, a light source and a support, the camera and the light source are arranged together and are all mounted on the support, the camera, the light source and the support are assembled together for use, and the camera shooting assemblies are mounted at proper positions according to the testing requirements of the automobile chassis part fatigue test. The camera is a fixed-focus lens, once the crack length and the proportion of the picture pixels are determined, the crack measuring length is calibrated for one time, and the length is not required to be calibrated in the subsequent use process. The light source provides high-intensity light for the camera is shot, guarantees that the crackle photo definition of camera shooting does not receive the influence of automobile chassis spare part fatigue test room environment. The light source irradiates the surface of the test sample, and the camera photographs the surface of the test sample. The bracket has enough strength for supporting the camera and the light source, is convenient to move and fix, and can be conveniently fixed at a proper position of the fatigue test bench for the automobile chassis parts. And the support can be bent with multiple degrees of freedom, so that the position of the camera can be conveniently adjusted.
The light source controller is electrically connected with the light source and used for supplying power to the light source, and the light source controller further comprises a brightness adjusting module used for adjusting the brightness of the light source, and the light source controller can adjust the brightness of the light source.
The industrial personal computer is in signal connection with the camera and the display and comprises a photographing control unit, a test load information acquisition unit, a photo information labeling unit, a display control unit, a storage unit and a crack length comparison unit as shown in figure 2. The photographing control unit is used for controlling the camera to photograph, the photographing control unit can control the camera to start, stop, photograph interval and exposure time, and the camera can photograph according to the control of the industrial personal computer. The test load information acquiring unit is used for acquiring test load loading information of an automobile fatigue test, for example, as shown in fig. 4, the test load information acquiring unit is in signal connection with a PLC control unit, the PLC control unit is in signal connection with an automobile chassis part hydraulic test system, and the test load information acquiring unit acquires the test load loading information of the automobile chassis part hydraulic test system through the PLC control unit. The picture information marking unit is used for identifying cracks and crack lengths appearing in the pictures shot by the camera and marking crack positions, crack numbers, crack lengths, test load loading information and shooting time information in the pictures. The storage unit stores the pictures shot by the camera and the pictures marked with the information. The crack length comparison unit is used for comparing the identified crack length with a set length value, and sending a control signal for controlling the automobile chassis part fatigue test bench to stop when the crack length is larger than or equal to the set length value. The display control unit is used for controlling the display to display the marked photos.
In this embodiment 1, when the intelligent crack monitoring system for the fatigue test of the automobile chassis parts monitors cracks of the fatigue test of the automobile chassis parts, the flow is as follows.
After the fatigue test of automobile chassis parts is prepared, the supports, the cameras and the light sources of the corresponding number of camera assemblies are assembled according to measurement requirements, cables between the industrial personal computer and the display and between the industrial personal computer and the camera light source controller and the light sources are connected, the supports are arranged and fixed at proper positions of the fatigue test bench of the automobile chassis parts according to the crack monitoring requirements of the tested automobile chassis parts, and the bending freedom degree of the supports is adjusted to ensure that the cameras shoot front photos of the surfaces of the tested samples as far as possible. Then, starting an industrial personal computer and a light source controller, and adjusting the brightness of a light source; the method comprises the steps of displaying pictures shot by all cameras used for monitoring a test through a display, setting the time interval for shooting by the cameras, setting the length value of a crack when the test is stopped, adjusting the exposure time of the cameras and the distance from the cameras to the surface of a tested sample to ensure that the picture is clear, and then starting to shoot the picture on the surface of the tested sample.
Starting a fatigue test bed for automobile chassis parts, applying a cyclic load to a sample, controlling the camera to take a picture by a picture taking control unit of the industrial personal computer, feeding the picture taken by the camera back to the industrial personal computer, and storing the picture in the storage unit; the experimental load information obtaining unit obtains load loading information of a fatigue test of parts of the automobile chassis, for example, as shown in fig. 4, the PLC control unit feeds the test load loading information back to the experimental load information obtaining unit of the industrial personal computer; the method comprises the following steps that a photo information marking unit of the industrial personal computer identifies cracks and lengths of the cracks in a photo, marks crack positions, crack numbers, crack lengths, test load loading information and shooting time on the photo, and stores the marked photo; and the display control unit controls the display to display the photo marked with the information.
The crack intelligent monitoring system continuously monitors cracks of a tested sample of the automobile chassis part fatigue test bench, the crack length comparison unit of the industrial personal computer compares the identified crack length with a length set value, when the crack length reaches the set length value (which is more than or equal to the set length value), the industrial personal computer sends out a control signal for controlling the automobile chassis part fatigue test bench to stop, controls the automobile chassis part fatigue test bench to stop, and ends the crack monitoring of the automobile chassis part fatigue test.
The embodiment 1 provides an intelligent crack monitoring system for a fatigue test of automobile chassis parts, which can accurately monitor cracks generated in the fatigue test process of the automobile chassis parts in real time, can regularly shoot crack photos generated by a tested sample, accurately monitor the whole process of crack initiation and expansion, is not limited by people and working time, and improves the efficiency of automobile related tests.
Example 2:
in this embodiment 2, a test equipment for automobile chassis spare part fatigue test is provided, as shown in fig. 3 including the display, the industrial computer, the PLC the control unit, automobile chassis spare part hydraulic test system, the camera, the light source, and a support, the light source controller, there is information interaction between display and the industrial computer, there is information interaction between industrial computer and the PLC the control unit, there is information interaction between PLC the control unit and the automobile chassis spare part hydraulic test system, pass through the cable between light source controller and the light source and be connected, camera and light source are integrated together, camera and light source are supported and fixed to the support, there is information interaction between camera and the industrial computer, the sample crackle photo of automobile chassis spare part fatigue test is shot to the camera.
The light source controller is electrically connected with the light source and used for supplying power to the light source, and the light source controller further comprises a brightness adjusting module used for adjusting the brightness of the light source, and the light source controller can adjust the brightness of the light source.
The industrial personal computer is in signal connection with the camera and the display and comprises a photographing control unit, a test load information acquisition unit, a photo information labeling unit, a display control unit, a storage unit and a crack length comparison unit as shown in figure 4. The photographing control unit is used for controlling the camera to photograph, the photographing control unit can control the camera to start, stop, photograph interval and exposure time, and the camera can photograph according to the control of the industrial personal computer. The test load information acquiring unit is used for acquiring test load loading information of an automobile fatigue test, for example, as shown in fig. 4, the test load information acquiring unit is in signal connection with a PLC control unit, the PLC control unit is in signal connection with an automobile chassis part hydraulic test system, and the test load information acquiring unit acquires the test load loading information of the automobile chassis part hydraulic test system through the PLC control unit. The picture information marking unit is used for identifying cracks and crack lengths appearing in the pictures shot by the camera and marking crack positions, crack numbers, crack lengths, test load loading information and shooting time information in the pictures. The storage unit stores the photo marked with the information. The crack length comparison unit is used for comparing the identified crack length with a set length value, when the crack length is larger than or equal to the set length value, the industrial personal computer sends out a control signal for controlling the hydraulic test system of the automobile chassis part to stop, and the PLC control unit controls the hydraulic test system of the automobile chassis part to stop. The display control unit is used for controlling the display to display the marked photos.
The industrial personal computer can adjust the exposure time of the camera. The shooting control unit of the industrial personal computer can set shooting starting, stopping and shooting intervals of the camera, the camera can shoot according to instructions of the industrial personal computer, and photos shot by the camera are fed back and stored in the storage unit of the industrial personal computer. The picture information marking unit of the industrial personal computer can identify cracks and crack lengths of automobile chassis parts on line, fatigue crack pictures of the automobile chassis parts, which are shot by the camera, are stored in the storage unit, and crack positions, crack numbers, crack lengths, test load loading information and shooting time information are marked and displayed in the crack pictures stored by the industrial personal computer.
The PLC control unit acquires load loading information of a fatigue test of the automobile chassis parts by performing information interaction with the hydraulic test system of the automobile chassis parts, and feeds the test load loading information back to the test load information acquisition unit of the industrial personal computer.
The industrial personal computer can set a crack length threshold value, and when the crack length reaches a set length value, the industrial personal computer controls the hydraulic test system of the automobile chassis part to stop through the PLC control unit.
The light source controller supplies power to the light source, and the light source controller can also adjust the brightness of the light source. In this embodiment, the number of the cameras, the light sources, and the brackets is 6, the cameras, the light sources, and the brackets are assembled together for use, and in other embodiments, a corresponding number of the cameras, the light sources, and the brackets may be selected according to a testing requirement of a fatigue test of a component of an automobile chassis (for example, in other embodiments, the number of the cameras, the light sources, and the brackets may be 1, 2, 3, 4, 5, 7, 8, 9, 10, 11, 12, 13-72, and the like).
The camera is a fixed-focus lens, the crack length and the proportion of the picture pixels are input to the industrial personal computer, only one calibration is needed to be carried out on the crack measurement length, and the length does not need to be calibrated in the subsequent use process.
The light source provides high-intensity light for the camera is shot, and the crack photo definition that the camera was shot can be guaranteed not to receive the influence of automobile chassis spare part fatigue test room environment through adjusting light source luminance and exposure time.
The holder has sufficient strength for holding the camera and the light source. The support is convenient to move and fix, and can be conveniently fixed at a proper position of the automobile chassis part fatigue test bench. The support can be bent with multiple degrees of freedom, so that the position of the camera can be conveniently adjusted.
The hydraulic test system for the automobile chassis parts in the embodiment can be a chassis test bed which is commonly used in the market for testing static, dynamic and fatigue mechanical properties of a chassis, and comprises a hydraulic oil source, an oil separator, a linear hydraulic actuator, a hydraulic pipeline, a computer workstation, a digital test controller, integrated test software and other parts, and the existing international advanced test bed manufacturers include American MTS, American MOOG and German Instron.
The flow of the test equipment for the fatigue test of the automobile chassis parts in the embodiment in the fatigue test of the steering knuckle is as follows.
1. A test object is prepared. The test object is a certain type of automobile steering knuckle for carrying out a bench fatigue test, a test bench is built, and information such as test load is set on a hydraulic test system according to test standards.
2. And arranging an intelligent crack monitoring system. The method comprises the steps of assembling a corresponding number of supports, cameras and light sources according to needs, arranging and fixing the supports at positions of a steering knuckle where cracks need to be monitored, and adjusting the bending freedom degree of the supports to ensure that the cameras shoot front photos on the surface of the steering knuckle as far as possible. And cables are connected between the industrial personal computer and the display, between the industrial personal computer and the camera, between the industrial personal computer and the PLC control unit, between the PLC control unit and the hydraulic test system, and between the light source controller and the light source, and the industrial personal computer, the light source controller and the PLC control unit are started. And adjusting the brightness of the light source. The cameras used in combination on the intelligent crack monitoring control software of the industrial personal computer through the display are used for setting the time interval of camera shooting and setting the crack length when the test is stopped. And adjusting the exposure time of the camera and the distance between the camera and the surface of the measured sample until the picture is clear.
3. And monitoring the cracks. And starting an intelligent crack monitoring system to shoot a picture of the surface of the steering knuckle. And starting a test of the steering knuckle on a hydraulic test system, and applying a cyclic load to the steering knuckle. The pictures shot by the camera are fed back to the industrial personal computer, and meanwhile, the PLC control unit feeds back the load loading information of the hydraulic test system to the industrial personal computer. The industrial personal computer identifies the cracks and the lengths of the cracks in the pictures, marks crack positions, crack numbers, crack lengths, test load loading information and shooting time on the pictures, and stores the marked pictures in the storage unit. The surface of the knuckle was continuously monitored for cracks.
4. And finishing the crack monitoring. And when the crack length reaches a set length value, the industrial personal computer controls the hydraulic test system to stop through the PLC control unit, and the crack monitoring of the fatigue test of the steering knuckle is finished. And reading crack information in the crack photo and filling test records.
Test example 1: the experimental equipment provided with the intelligent crack monitoring system and used for the fatigue test of the automobile chassis parts in the embodiment 2 is adopted to carry out the fatigue test of the steering knuckle, and the length value of the crack after the test is finished and the automobile is shut down is obtained.
Comparative example 1: the length of the generated crack is regularly measured and the result is recorded by an engineer in the process of carrying out a fatigue test on conventional fatigue test equipment which is not provided with an intelligent crack monitoring system.
Test example 1 and comparative example 1 were conducted to monitor cracks generated in the same knuckle fatigue test, and the test results of test example 1 and comparative example 1 were comparable. The crack lengths measured after the fatigue test was completed in test example 1 and comparative example 1 were compared in table 1, and the results are shown below.
Table 1 test results of test example 1 and comparative example 1.
Test group Crack 1 length value/mm Crack 2 length value/mm Crack 3 length value/mm
Test example 1 6.12 5.57 6.67
Comparative example 1 6.56 5.83 6.53
It can be seen from the test results that the cracks generated by the sample in the same knuckle fatigue test are detected, and the result of the crack length value measured by the fatigue test equipment with the intelligent crack monitoring system in the embodiment 2 is high in consistency with the result of the crack length value measured by an engineer in the conventional fatigue test equipment without the intelligent crack monitoring system.
The foregoing detailed description of the embodiments of the present application has been presented to illustrate the principles and implementations of the present application, and the above description of the embodiments is only provided to help understand the method and the core concept of the present application; meanwhile, for a person skilled in the art, according to the idea of the present application, there may be variations in the specific embodiments and the application scope, and in summary, the content of the present specification should not be construed as a limitation to the present application.

Claims (7)

1. The crack monitoring equipment for the automobile fatigue test is characterized by comprising a light source controller, an industrial personal computer, a display and at least one camera shooting assembly, wherein the camera shooting assembly comprises a camera, a light source and a support, the camera and the light source are arranged together and are both arranged on the support, the light source irradiates the surface of a test sample, and the camera shoots the surface of the test sample;
the light source controller is electrically connected with the light source and used for supplying power to the light source;
the industrial personal computer is in signal connection with the camera and the display and comprises a photographing control unit, a test load information acquisition unit, a photo information labeling unit and a display control unit;
the photographing control unit is used for controlling the camera to photograph;
the test load information acquisition unit is used for acquiring test load loading information of an automobile fatigue test;
the picture information marking unit is used for identifying cracks and crack lengths appearing in the pictures shot by the camera and marking crack positions, crack numbers, crack lengths, test load loading information and shooting time information in the pictures;
the display control unit is used for controlling the display to display the marked photos.
2. The crack monitoring apparatus for the automobile fatigue test as recited in claim 1, wherein the light source controller further comprises a brightness adjusting module for adjusting brightness of the light source.
3. The crack monitoring device for the automobile fatigue test as recited in claim 1, wherein the photographing control unit can control the camera to be turned on, turned off, photographing interval and exposure time.
4. The crack monitoring device for the automobile fatigue test according to claim 1, wherein the industrial personal computer further comprises a storage unit, and the storage unit stores the picture taken by the camera and the picture marked with information.
5. The crack monitoring device for the automobile fatigue test as recited in claim 1, wherein the camera is a fixed focus lens.
6. The crack monitoring device for the automobile fatigue test according to any one of claims 1 to 5, wherein the industrial personal computer further comprises a crack length comparison unit for comparing the identified crack length with a set length value.
7. An experimental facility for automobile fatigue test, which is characterized by comprising a PLC control unit, a hydraulic test system for automobile chassis parts, and a crack monitoring facility for automobile fatigue test as claimed in any one of claims 1-6;
the PLC control unit is in signal connection with the industrial personal computer and a controller of the automobile chassis part hydraulic test system; the industrial personal computer can acquire the test load loading information of the hydraulic test system of the automobile chassis part from the PLC control unit, and can control the hydraulic test system of the automobile chassis part to stop through the PLC control unit when the identified crack length is larger than a set length value.
CN202110448884.7A 2021-04-25 2021-04-25 Crack monitoring equipment and test equipment for automobile fatigue test Pending CN113514353A (en)

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN114383796A (en) * 2021-11-30 2022-04-22 东风商用车有限公司 Point inspection method and system for road vibration simulation test

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KR20080004737A (en) * 2006-07-06 2008-01-10 조명래 Method and measuring device of fatigue
KR101094069B1 (en) * 2010-02-26 2011-12-15 한국표준과학연구원 Calibration Device and Method for revision of Crack Detection System by Using Image Processing Technology
JP7166862B2 (en) * 2018-09-27 2022-11-08 キヤノン株式会社 Information processing device, information processing method and program, storage medium

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN114383796A (en) * 2021-11-30 2022-04-22 东风商用车有限公司 Point inspection method and system for road vibration simulation test
CN114383796B (en) * 2021-11-30 2024-02-13 东风商用车有限公司 Point inspection method and system for road vibration simulation test

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