CN110658004A - Method for testing a tyre - Google Patents

Method for testing a tyre Download PDF

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Publication number
CN110658004A
CN110658004A CN201810713710.7A CN201810713710A CN110658004A CN 110658004 A CN110658004 A CN 110658004A CN 201810713710 A CN201810713710 A CN 201810713710A CN 110658004 A CN110658004 A CN 110658004A
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CN
China
Prior art keywords
tire
measurement
tyre
sidewall
region
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
CN201810713710.7A
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Chinese (zh)
Inventor
孙君立
孙旭
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Carle Zeiss Photoelectric Technology Co Ltd
Original Assignee
Carle Zeiss Photoelectric Technology Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Carle Zeiss Photoelectric Technology Co Ltd filed Critical Carle Zeiss Photoelectric Technology Co Ltd
Priority to CN201810713710.7A priority Critical patent/CN110658004A/en
Publication of CN110658004A publication Critical patent/CN110658004A/en
Pending legal-status Critical Current

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Classifications

    • GPHYSICS
    • G01MEASURING; TESTING
    • G01MTESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
    • G01M17/00Testing of vehicles
    • G01M17/007Wheeled or endless-tracked vehicles
    • G01M17/02Tyres
    • G01M17/027Tyres using light, e.g. infra-red, ultra-violet or holographic techniques
    • GPHYSICS
    • G01MEASURING; TESTING
    • G01BMEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
    • G01B11/00Measuring arrangements characterised by the use of optical means
    • G01B11/16Measuring arrangements characterised by the use of optical means for measuring the deformation in a solid, e.g. optical strain gauge
    • G01B11/161Measuring arrangements characterised by the use of optical means for measuring the deformation in a solid, e.g. optical strain gauge by interferometric means
    • G01B11/162Measuring arrangements characterised by the use of optical means for measuring the deformation in a solid, e.g. optical strain gauge by interferometric means by speckle- or shearing interferometry
    • GPHYSICS
    • G01MEASURING; TESTING
    • G01BMEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
    • G01B11/00Measuring arrangements characterised by the use of optical means
    • G01B11/16Measuring arrangements characterised by the use of optical means for measuring the deformation in a solid, e.g. optical strain gauge
    • G01B11/161Measuring arrangements characterised by the use of optical means for measuring the deformation in a solid, e.g. optical strain gauge by interferometric means
    • G01B11/164Measuring arrangements characterised by the use of optical means for measuring the deformation in a solid, e.g. optical strain gauge by interferometric means by holographic interferometry
    • GPHYSICS
    • G01MEASURING; TESTING
    • G01BMEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
    • G01B11/00Measuring arrangements characterised by the use of optical means
    • G01B11/16Measuring arrangements characterised by the use of optical means for measuring the deformation in a solid, e.g. optical strain gauge
    • G01B11/167Measuring arrangements characterised by the use of optical means for measuring the deformation in a solid, e.g. optical strain gauge by projecting a pattern on the object

Abstract

The invention relates to a method for testing a tire mounted on a rim, wherein the tire rests with its rolling surface on a contact region and is locally deformed thereby, and wherein the sidewall of the tire is captured in a measurement region by means of an optical measurement method. The method is characterized in that the measurement region is arranged with respect to the contact region in such a way that the sidewall of the tire captured by the optical measurement method in the measurement region is locally deformed as a result of the tire resting on the contact region.

Description

Method for testing a tyre
Technical Field
The invention relates to a method for testing a tire assembled on a rim, wherein the tire rests with its rolling surface on a contact region and is thereby locally deformed, and wherein the sidewall of the tire is captured in a measurement region by an optical measurement method.
Background
Such a process has been disclosed in DE 102009008468 a 1. Here, the surface of the tire is measured for the first time, the tire is exposed to a mechanical load by generating a centrifugal force and/or pressure acting on the tire, and the surface of the tire is measured for the second time. From these two measurements, the shape change of the tire caused by the mechanical load is determined. This should allow the identification of structural damage due to mechanical loads. In DE 102009008468 a1, a tire to be tested is rotatably mounted on a test stand and is loaded with pressure by means of a roller on which the tire rests. Furthermore, three measuring devices are provided, which measure the tire in a region remote from the roller.
US 3,589,182A and US 3,640,132A each disclose a test station on which a tire rests on rollers for visual testing of damage that occurs under an applied load, and a load is applied to the tire by the rollers while the tire is rotating.
However, the above method can capture only the damage caused by the load. The above method therefore requires the application of considerable loads to the tyre, which can be used to simulate the loads over the service life of the tyre or in extreme cases on the tyre. Therefore, the above method is only suitable for testing the material of the sample at the time of spot inspection.
DE 102004062412B 4 discloses a method for capturing the surface of a rotating tire.
DE 19730787 a1 discloses a method for determining the movement of profile elements arranged on the tread of a tire, wherein the tread is irradiated with light through slits arranged in the circumference of a drum on which the tire rests, the position of the profile elements being determined by the reflection of the light.
DE 19731486 a1 discloses a method in which a tire rotatably mounted on a test stand is tested. For this purpose, the surface of the tire is measured in sections at two different pressure levels of the tire pressure by interferometry. This should enable the identification of defects inside the tyre.
Document DE 102004050355 a1 discloses a method for testing the surface of a tyre, in which a first record of the pattern projected onto the tyre is generated, the tyre is rotated about its axis and a further record of the pattern projected onto the tyre is made, wherein the two records are compared with each other. This should also enable the identification of defects inside the tyre.
However, the methods known from the prior art do not allow sufficiently reliable testing of tires assembled on rims.
Disclosure of Invention
It is therefore an object of the present invention to provide an improved method for testing a tire assembled on a rim.
This object is achieved by a method according to the independent claim of the present invention. Preferred configurations of the invention are the subject of the dependent claims.
In a first aspect, the invention comprises a method for testing a tire assembled on a rim, wherein the tire rests with its rolling surface on a contact area and thereby causes a local deformation of the tire, and wherein the sidewall of the tire is captured in a measurement area by an optical measurement method. The method is characterized in that the measurement region is arranged with respect to the contact region in such a way that the sidewall of the tire captured by the optical measurement method in the measurement region is locally deformed as a result of the tire resting on the contact region.
The inventors of the present application have realized that errors can be better identified by measuring the deformation of the sidewall of the tire in the region of the measurement than if the measurement were made in the undeformed region of the sidewall (which is used for measurements according to the prior art).
The measuring region is therefore arranged relative to the contact region in such a way that the sidewall deforms in the measuring region, said deformation being caused by the pressure currently acting in the contact region. As a result of tire failure, such failure can be identified as a sidewall that deforms differently than a non-failed sidewall.
The measurement region preferably covers a region of the sidewall of the tire adjacent to the contact region. In particular, the measurement region may cover a region of a sidewall of the tire arranged between the contact region and a rim of the tire in the height direction. The height direction is understood here to mean the direction defined by the connecting line between the center point of the contact region and the axis of the tire.
The measurement area may be arranged centrally with respect to the contact area, or the measurement area may cover an area displaced forwards or backwards with respect to the contact area.
In a possible configuration of the invention, the defects of the internal structure of the tyre are captured by capturing the sidewalls by means of an optical measurement method. Such defects of the internal structure of the tyre, by means of which they can be identified, affect the deformation of the tyre in the measurement zone.
In a possible configuration of the invention, defects of the internal structure of the sidewall of the tyre can be captured by optical measurement methods. However, the defects captured are not necessarily located in the measurement area, since defects located outside the measurement area also affect the deformation of the tire in the measurement area and can therefore be captured indirectly.
In a possible configuration of the invention, defects of the internal structure of the tread of the tyre can be captured by optical measurement methods. This is because even such a defect affects the deformation of the sidewall.
In a possible configuration of the invention, the defects are captured by digital image evaluation.
Preferably, the defect is captured by comparing a measurement image recorded by an optical measurement method with a reference image.
In a possible configuration of the invention, the reference image may reproduce the deformation of a defect-free region of the sidewall of the tyre.
In a possible configuration of the invention, the reference image is generated by measuring a non-defective tyre. However, this requires that the flawless tire be tested under exactly the same conditions as the tire to be tested.
In a possible configuration of the invention, the reference image is generated on the basis of one or more measurement images of the tyre to be tested.
The measurement images and the measurement image or images on which the reference image is generated are preferably recorded under identical conditions, in particular with identical tire pressure, identical rotational speed of the tire (which may also be equal to zero), and identical contact pressure in the contact area.
The respective measurement images preferably show the same measurement region relative to the contact region and can in particular be recorded without changing the position of the measurement head for optical capture relative to the contact region.
However, the respective measurement images preferably show different areas of the side face of the tire.
If multiple measurement images are used, these images are preferably used to determine the deformation of the fault-free region of the tire, which deformation is then used as a reference image.
For example, the reference image may be implemented by averaging over a plurality of regions of the sidewall of the tire under test.
Alternatively, the reference image may be generated by using an image that is spatially shifted with respect to the measurement image. This can be achieved by means of a measurement image which is itself spatially shifted and used as a reference image or by means of a reference image captured with modification of the tire position. By comparing such reference images with the measurement images, a result image is visualized which reproduces the spatial derivatives of the surface deformation and presents visible faults of the tyre structure. In particular, the method known from DE 102004050355 a1 can be used in this respect, with the difference that, according to the invention, the measurement is carried out in the deformation region of the sidewall.
Furthermore, a plurality of measurement images which partially overlap in terms of the capture surface area of the tire may be recorded such that a certain point of the tire in the plurality of measurement images is arranged in different parts of the measurement area in each case. Preferably, the angle by which the tyre is rotated forwards between the two measurement images is at least one hundredth and preferably one tenth of the angular range covered by the measurement area.
Therefore, the failure existing at a specific point of the tire is located in a region of the tire surface that is deformed to a different degree in each case in these different measurement images, and therefore the failure has a different influence on the shape of the tire surface in each case. As a result, defective spots of the tire can be captured in an improved manner.
In a possible configuration of the invention, the three-dimensional surface shape of the sidewall of the tire is captured by an optical measurement method.
In particular, the three-dimensional surface shape of the sidewall of a tire can be achieved by recording and evaluating the pattern projected onto the sidewall.
The images directly captured by the camera, which are digitally post-processed by image processing if necessary, can be used as measurement images and/or reference images within the meaning of the invention.
However, any data record based on the evaluation of one or more directly captured images (for example a data record reproducing the three-dimensional surface of the sidewall of the tire in the measurement area) can also be considered as a measurement image and/or a reference image within the meaning of the present invention.
In a possible configuration of the invention, the optical measurement method is realized by an optical measurement head comprising at least one camera. The at least one camera is preferably arranged laterally next to the tyre and directed towards the sidewall of the tyre above the contact area. In a possible configuration, multiple cameras directed to the same area may be provided.
Preferably, the measurement head further comprises a projector. Preferably, the projector projects a pattern, in particular a planar pattern, onto a sidewall of the tire. Preferably, the pattern is captured by one or more cameras of the measuring head.
Preferably, the optical measurement method is based on optical triangulation or optical correlation.
In a possible configuration, the measurement head comprises a plurality of cameras directed from different directions to the measurement area.
In a possible configuration of the invention, the measurement area covers only a portion of the sidewall, and in particular the measurement area does not cover the entire circumference of the tire. In particular, the measurement area may cover an angular range of the tire of less than 180 °, preferably less than 90 °.
In a possible configuration of the invention, the tire is rotated about its axis to capture multiple regions of its sidewall.
In a first variant of the invention, the measurement is carried out while the tyre is rotating, so that the deformation of the sidewall of the tyre in the measurement region comprises a dynamic deformation. Through such dynamic deformation, defects inside the tire are more clearly exhibited. However, the measurement method becomes more complicated and more prone to errors.
Preferably, a pulsed light source is used in order to project onto the measurement area. In particular, the light source may be a pulsed laser and/or a flash bulb. This can reliably capture the sidewall of the tire even with the tire rotating. Furthermore, a series of measurement images may be recorded that reproduce different regions of the sidewall, where the measurement images may overlap.
In a second variant of the invention, the measurement is carried out with a stationary tire. As a result, the deformation of the sidewall of the tire in the measurement region only includes the static deformation of the tire caused by the contact pressure in the contact region.
Preferably, the tire is rotated forward between separate measurement passes for capturing multiple regions of the sidewall of the tire.
In a possible configuration of the invention, the tire is held on the vehicle together with the rim. As a result, the cost during testing is significantly reduced. This is advantageous in particular when testing aircraft tyres.
In a possible configuration of the invention, the test is carried out by means of the rolling of the tyre on a test bench.
According to a second aspect thereof, the invention comprises a method for testing a tyre assembled on a rim, in particular according to any one of the preceding methods, wherein the tyre rests with its rolling surface on a contact area and is thereby caused to be loaded, and wherein a sidewall of the tyre is captured in a measurement area by an optical measurement method. A second aspect is characterized in that the tire is held on a vehicle with the rim, and the vehicle is driven with the tire to be tested to measure different regions of the sidewall.
As a result, the tire can be tested without a fixed test stand, and thus the cost for the test can be significantly reduced.
In a possible configuration of the second aspect, the optical measurement method is implemented by a measurement head moving together with a vehicle for implementing the method. This ensures that the measuring head remains correctly aligned with respect to the tyre to be tested.
In a first variant, the measuring head can be assembled on a vehicle on which the tyre to be tested is assembled.
In a second variant, the measuring head can be assembled on another vehicle (for example a ground conveyor) which moves the vehicle on which the tyre to be tested is assembled.
In a possible configuration of the invention, the assembly is carried out on the chassis of the vehicle on which the tyre to be tested is assembled, in particular on the undercarriage of an aircraft.
First, the method according to the second aspect may be performed in a measurement area arranged as desired with respect to the contact area of the tyre.
However, the method according to the second aspect is preferably performed in combination with the first aspect, i.e. with measurement areas arranged according to the first aspect.
Furthermore, the method according to the second aspect may be implemented as already described in more detail above in connection with the preferred configuration of the first aspect.
The invention also relates to a tire testing device for carrying out the method described above, having a measuring head for the optical measuring method and having an evaluation unit for capturing defects of the tire on the basis of the measurements made by the measuring head.
In a first variant of the invention, the tire testing device comprises a movable counter element, in particular a roller, on which the tire rests. Alternatively or in addition, the tire testing device may have an assembly device for connecting the measuring head to a test stand.
In a second variant of the invention, the tyre testing device comprises an assembly device for detachably connecting a measuring head to a vehicle on which the tyre to be tested is arranged.
As a result, testing of the tires can be carried out, wherein the measuring head is moved together with the tire to be measured or the vehicle on which the tire to be measured is arranged.
Preferably, the assembly means allow the position of the measuring head to be adjusted relative to one or more connection points with the vehicle, and for this purpose there are preferably adjustment means.
Preferably, the tyre testing apparatus is constructed and operated as already presented above in view of the method according to the invention.
Drawings
The invention will now be described in more detail on the basis of an exemplary embodiment and the accompanying drawings. In the figure:
FIG. 1: a diagram illustrating the principles of an exemplary embodiment of a method according to the present invention;
FIG. 2: a diagram illustrating the principle of a first exemplary embodiment of a test device according to the present invention is shown; and is
FIG. 3: an illustration of the principle of a second exemplary embodiment of a test device according to the present invention is shown.
Detailed Description
An exemplary embodiment of the method according to the present invention will now be described in more detail on the basis of fig. 1. Fig. 1 shows a tire 2 fitted to a rim 1. In the exemplary embodiment, the tire is arranged to be rotatable about its axis of rotation 6.
While carrying out the test method according to the invention, the tire 2 rests with its rolling surface 7 on the contact region 3 and is deformed there by a contact force acting in the contact region. In the exemplary embodiment illustrated in fig. 1, the tire 2 rests on a rotatable roller 4 in a contact area 3. Alternatively, however, the tire may also rest on a stationary surface.
According to the invention, the sidewall 8 of the tyre 2 is captured by an optical measurement method. This is achieved in the measurement region 5 which is arranged with respect to the contact region 3 (in which the tire rests with its rolling surface 7) in such a way that the tire is deformed in the measurement region 5 by the contact force acting thereon in the contact region 3. Thus, according to the invention, the characteristic deformation of the sidewall of the tire is measured in the region of the contact point of the tire with the ground or the test bench roller.
As a result, faults inside the tire can be identified in a non-destructive manner, since they can affect the deformation of the tire in the measurement region 5 caused by the contact force. In particular, air inclusions in the fabric inside the tyre and the separation and breakage of the fabric, which occur during production or during use and within the working range of the tyre, can be identified.
Thus, the measuring region 5 is arranged above the contact region 3, between the contact region and the rim 1 on which the tire is fitted. In an exemplary embodiment, the measurement area covers the entire height of the sidewall of the tire.
Thus, according to the present invention, the failure generated by the load on the tire is not captured. Instead, the deformation of the tire in the region of the contact region is used to be able to better identify existing faults, since these faults are manifested by way of the deformation. Thus, the deformation of the tire in the measurement region 5 is not a permanent deformation which itself constitutes a tire failure, but a deformation which is caused locally by the currently acting contact pressure in the measurement region.
In contrast, according to the prior art, the sidewall of the tire is always captured in a region arranged at a distance from the contact region, so as to precisely avoid such reversible deformations of the captured tire.
In a possible configuration of the invention, the three-dimensional configuration of the deformed region of the sidewall can be measured by optical measurement methods and compared with a reference image. For example, the reference image may be determined on the same tyre, for example by averaging over a plurality of regions or over the entire circumference of the tyre, or by any other identification of non-defective regions. Alternatively, the reference image may be determined on another non-defective tire.
In an alternative configuration, the measurement image may also be compared with a reference image, which is slightly spatially shifted with respect to the measurement image. This can be achieved by capturing two measurement images, between which the tyre is slightly rotated, said measurement images then being compared; or this may be achieved by overlaying a slightly shifted version of the same measurement image on the measurement image. The failure is also more clearly evident here, since one derivative type of the surface shape is produced by the displacement.
The measured image, which may also be three-dimensional surface data determined from direct measurement data, may be further processed by image processing methods, for example in order to be able to better distinguish thickness variations of the tyre material, or indentations on the tyre, from faults of the internal structure of the tyre.
In the exemplary embodiment, a planar measurement region 5 is used, and in particular, the three-dimensional shape of the surface is captured in a two-dimensional extended region of the sidewall. Since the different deformation regions of the tire are thus located in the measuring region 5, this has significant advantages for the method according to the invention. However, where applicable, one-dimensional measurement areas, in particular a measurement line or a plurality of measurement lines covering a measurement area, are also conceivable.
Different optical measurement methods can be used according to the invention. Preferably, the optical measurement method allows capturing the three-dimensional surface shape of the sidewall of the tire. Preferably, the optical measurement method has a resolution in the range between one and ten micrometers.
Possible optical measurement methods that can be used are, for example:
-projecting a pattern onto the tyre, said pattern being captured by one or more cameras. In particular, the pattern may be a stripe pattern. The projection may be performed with incoherent light.
Correlation methods in which images recorded by a plurality of cameras are correlated to capture a three-dimensional embodiment of a surface. To this end, marks on the surface of the tire or characteristic points on the tire may be captured. Alternatively or additionally, a pattern may be applied to the surface of the tire, or a pattern may be projected onto the surface of the tire, the pattern being captured and associated by at least two cameras.
-interferometric methods: in particular, the three-dimensional surface of the tire may be captured by shear interference. In addition, speckle interferometry or holography may also be used. However, these methods are susceptible to interference.
Laser scanners, where a point, one or more lines are projected by a laser onto the tire surface in a measurement area. Preferably, at least a plurality of lines are used in this case.
Furthermore, the optical measurement methods that can be used according to the invention can be classified according to the respective evaluation as follows:
optical triangulation (this is used in particular in the case of fringe projection, which is usually realized with incoherent light, or in the case of laser scanners).
Optical correlation (this may be used in particular when modulated incoherent light or laser speckle is used).
Preferably, the optical measurement method is performed according to the invention by optical correlation of the images of at least two cameras observing the measurement area 5.
Fig. 2 illustrates, in an exemplary manner, a measuring head that may be used in the method illustrated in fig. 1. The measuring head is arranged next to the tyre and directed above the contact area 3 towards the sidewall 8 of the tyre.
In the exemplary embodiment, the measuring head has two cameras 11, which are both directed at the measuring area 5, and a projector 10, which projects a pattern onto the measuring area 5, which pattern is captured by the cameras 11. In alternative configurations, it is also possible to use only one camera, or to use a plurality of cameras. Further, optionally, the projector may be omitted.
The tyre testing apparatus according to the present invention may be implemented as a stationary test stand, wherein the tyre 2 rests on and rolls on rollers 4 as illustrated in fig. 2.
In a first version, the tire may be held on a car and rest on and moved by one or more rollers of a test stand. For this purpose, test stations already exist for other tests, which may be equipped, for example, only with the optical measuring head according to the invention, which inspects the tire in the contact area, and with suitable evaluation electronics. In a second variant, the tire can be removed from the vehicle and assembled on the axle of the test station by means of the rim 1.
In the configuration of the tire testing device just described, the optical measurement head has a device that is fixed during testing. Different regions of the side of the tyre can be tested by means of the tyre rotating around a likewise fixed wheel axle of a vehicle or test stand and rolling on rollers so that different regions of the side of the tyre reach the measuring region of the measuring head.
In an alternative configuration of the invention, the measurement head may move with the tire as it rolls on the stationary surface.
A corresponding exemplary embodiment is shown in fig. 3. Here, a tire testing device is shown which moves with a vehicle on which a tire to be tested is arranged.
In the exemplary embodiment, the vehicle is an aircraft 15 on which the tires 2 are arranged together with the rim 1 via the landing gear 14. If the aircraft 15 moves, the tyre 2 therefore rotates about the axle 6 of the landing gear.
The measuring head is carried with the moving vehicle, but the measuring head is always aligned with a measuring area arranged above the contact area. Thus, the measurement area remains in the same position relative to the vehicle, while due to the movement of the vehicle, different areas of the side of the tyre reach the measurement area.
For this purpose, the measuring head, which in the exemplary embodiment again has a projector 10 and one or more cameras 11, is detachably connected to a vehicle 15, in particular to the landing gear 14 of an aircraft, by means of an assembly device 13. The assembly device 13 may be fastened to one or more assembly points 16 of the landing gear 14. Preferably, adjustment means are provided by means of which the measuring head can be aligned to the measuring area 5 above the contact surface of the tire with the ground. In an exemplary embodiment, the projector 10 and the camera 11 or cameras 11 are connected to each other by a base 12, which may be suitably positioned by an assembly device 13.
Exemplary embodiments disclose a tire testing device that may be assembled on an aircraft to test for tire failure. This is advantageous because it is no longer necessary to disassemble the tire.
In the case of other vehicles, such as trucks or cars, it is also possible to use measuring heads which can be fastened to the vehicle accordingly.
Alternatively, the measuring head may also be arranged on a ground conveyor of the pulling vehicle.
Fig. 3 also schematically shows evaluation electronics 17, which are connected to the measuring head and evaluate the images recorded by the one or more cameras and/or start the projector 10. Furthermore, the evaluation electronics 17 may comprise a display 18, on which a malfunction of the sidewall of the tire or of the sidewall of the tire is shown, and/or input elements for operating the test device.
The measuring method according to the invention can be applied both in the case of dynamic loads on the tyre and in the case of static loads on the tyre. In the case of the dynamic method, the tire rolls while the measurement is being made. As a result, in addition to the static deformation due to the contact force, dynamic deformation is generated in which the tire deforms outward in the front side thereof with respect to the rolling direction and inward in the rear side with respect to the rolling direction. The static deformation is overlaid on this deformation, generally resulting in the tyre bulging in the region of the sidewall above the contact area. Such dynamic loads are particularly suitable for identifying faults of the internal structure of the tyre and for distinguishing these faults from thickness variations of the material, for example. If it is intended to measure a dynamically moving tire, it is preferable to use a pulsed light source. For example, a pulsed laser or flash lamp may be used.
Alternatively, a static method can be used, in which the tire is stopped after rotation in each case in order to take measurements.
Decisive in both cases is the optical trapping of the areas to which the tyre is subjected to load.

Claims (14)

1. Method for testing a tire assembled on a rim, wherein the tire rests with its rolling surface on a contact region and is locally deformed thereby, and wherein a sidewall of the tire is captured in a measurement region by means of an optical measurement method,
it is characterized in that the preparation method is characterized in that,
the measurement region is arranged with respect to the contact region in such a way that a sidewall of the tire captured by the optical measurement method in the measurement region is locally deformed as a result of the tire resting on the contact region.
2. The method according to claim 1, wherein the measurement region covers a region of a sidewall of the tire adjacent to the contact region, in particular a region of a sidewall of the tire arranged between the contact region and a rim of the tire in a height direction.
3. Method according to claim 1 or 2, wherein defects of the internal structure of the tyre are captured by capturing the sidewalls by means of the optical measurement method, wherein defects are captured in particular by comparing a measurement image recorded by the optical measurement method with a reference image.
4. Method according to claim 2, wherein the reference image is generated by measuring a defect-free tyre or wherein the reference image is generated based on one or more images of the tyre to be tested, in particular by averaging a plurality of regions of a sidewall of the tyre to be tested or by using a measurement image spatially shifted with respect to the measurement image.
5. Method according to any one of the preceding claims, wherein the optical measurement method captures the three-dimensional surface shape of the sidewall of the tyre, and/or wherein the optical measurement method is implemented by an optical measurement head comprising a projector and at least one camera, wherein the optical measurement method preferably operates based on optical triangulation or optical correlation, and/or wherein the measurement head preferably has a plurality of cameras directed from different directions to the measurement area.
6. The method of any one of the preceding claims, wherein the tire is rotated about its axis to capture multiple regions of its sidewall.
7. Method according to any one of the preceding claims, wherein said measurement is carried out while the tyre is rotating, so that the deformation of the sidewall of the tyre in the measurement region comprises a dynamic deformation, wherein preferably a pulsed light source is used in order to project onto the measurement region.
8. Method according to any one of the preceding claims, wherein said measurements are carried out while the tyre is stationary, wherein preferably the tyre is rotated forward between separate measurement processes for capturing regions of a sidewall of the tyre.
9. Method according to any one of the preceding claims, wherein the tyre is held together with the rim on a vehicle, wherein the tyre is preferably rolled on a test bench.
10. Method for testing a tire assembled on a rim, in particular according to any one of the preceding claims, wherein the tire rests with its rolling surface on a contact area and is loaded thereby, and wherein a sidewall of the tire is captured in a measurement area by an optical measurement method,
it is characterized in that the preparation method is characterized in that,
the tire is held on the vehicle with the rim, and the vehicle is driven with the tire to be tested to measure different regions of the sidewall.
11. Method according to claim 10, wherein the optical measurement method is carried out by means of a measurement head which, for the purpose of carrying out the method, is moved together with the vehicle, preferably by being assembled on the vehicle or on another vehicle which moves the vehicle, wherein the assembly is preferably carried out on a chassis of the vehicle, in particular on an undercarriage of an aircraft.
12. A tire testing device for carrying out the method according to any one of the preceding claims, having a measuring head for the optical measuring method and an evaluation unit for capturing defects of the tire on the basis of measurements made by the measuring head.
13. A tire testing device according to claim 12 having a movable counter element on which the tire rests, wherein the counter element is preferably a roller; and/or with assembly means for connecting the measuring head to a test bench.
14. Tire testing device according to claim 12, having an assembly device for detachably connecting the measuring head to a vehicle on which the tire to be tested is arranged, wherein the assembly device preferably allows adjusting the position of the measuring head relative to one or more connection points with the vehicle.
CN201810713710.7A 2018-06-29 2018-06-29 Method for testing a tyre Pending CN110658004A (en)

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