CN109447959A - Tire static load mark measurement method - Google Patents
Tire static load mark measurement method Download PDFInfo
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- CN109447959A CN109447959A CN201811213446.7A CN201811213446A CN109447959A CN 109447959 A CN109447959 A CN 109447959A CN 201811213446 A CN201811213446 A CN 201811213446A CN 109447959 A CN109447959 A CN 109447959A
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- mark
- tire
- ground connection
- static load
- measurement method
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06T—IMAGE DATA PROCESSING OR GENERATION, IN GENERAL
- G06T7/00—Image analysis
- G06T7/0002—Inspection of images, e.g. flaw detection
- G06T7/0004—Industrial image inspection
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- Quality & Reliability (AREA)
- Computer Vision & Pattern Recognition (AREA)
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Theoretical Computer Science (AREA)
- Length Measuring Devices By Optical Means (AREA)
- Tires In General (AREA)
Abstract
The invention discloses a kind of tire static load mark measurement methods, comprising the following steps: laser emits the front and back engagement edge of laser beam irradiation tire and glass table plate, and light beam is made sufficiently to be bonded tire ground connection edge；Using dark-field manner, places the cameras at below glass table plate and capture tire ground connection mark, acquire the ground connection print images under different loads；Gamma transformation and binary conversion treatment are carried out to the ground connection print images of acquisition, obtain pretreatment image；Mark point is chosen on mark boundary in tire ground connection mark pretreatment image, order is fitted according to ground connection mark form trade-off curve, is fitted mark point homologous thread, or by the way of spline interpolation, the final tire that obtains is grounded mark boundary curve.The present invention has the advantages that detection accuracy is high, test speed is fast, is suitable for different rib tires, overcomes the defect that existing tire wear test macro is unable to measure different rib tire ground connection marks and measurement accuracy difference.
Description
Technical field
The present invention relates to a kind of measurements of tire footprint, and in particular to a kind of tire static load mark measurement method.
Background technique
Tire is the important component of automobile, and the performance of tire has very big influence to vehicle.In modern tire manufacturing industry,
Tyre performance usually is analyzed by the grounding characteristics of tire, wherein having by applying load to static tire, for generation
The method that tire ground connection mark is analyzed, to the running resistance of study of tire, the characteristics such as frictional behaviour.
In the acquisition of tire static load mark, mainly there are pressure method and visible sensation method.Pressure method is mainly used
Pressure sensor, patent CN104897497A disclose a kind of method that tyre contact pressure distributional analysis improves wearability, acquisition
The pressure of different location on tire contact plane, and then obtain the ground connection boundary under tire static load.The problem of being primarily present has
Higher cost, the lower disadvantage of acquisition resolution.And visible sensation method is divided into inscription rubbing method and camera acquisition method, inscription rubbing method is by making to take turns
In steel plate under load effect, the surface of brown paper or other materials leaves mark and then analyzes tire ground connection boundary, patent tire
CN203203582U discloses a kind of vertical measurement platform of giant tyre mark, and patent CN102445352B discloses a kind of tire print
Analysis measurement method, main problem are that real-time is poor, and the test period is too long, and operating process is complicated.Camera acquisition method passes through phase
Machine shoots tire contact plane, according to the difference of tire contact plane and non-contact face brightness, and then obtains under tire static load
It is grounded boundary.But since under ordinary light source irradiation, tire and the brightness difference in ground contact surface and non-contact face are smaller, to ground connection
Mark judgement brings difficulty, can not even be differentiated on the tire of certain special decorative patterns such as block-type tread.
Summary of the invention
Goal of the invention: the purpose of the present invention is to provide a kind of tire static load mark measurement methods, solve existing wheel
The problem that tire static load mark measurement accuracy is not high, detection efficiency is low, poor for applicability.
Technical solution: tire static load mark measurement method of the present invention, comprising the following steps:
(1) the front and back engagement edge of laser transmitting laser beam irradiation tire and glass table plate, makes the abundant laminating wheel of light beam
Tire is grounded edge；
(2) dark-field manner is used, places the cameras at below glass table plate and captures tire ground connection mark, acquire different loads
Under ground connection print images；
(3) Gamma transformation and binary conversion treatment are carried out to the ground connection print images of acquisition, obtains pretreatment image；
(4) mark point is chosen on mark boundary in tire ground connection mark pretreatment image, according to ground connection mark form choosing
Curve matching order is selected, obtains the matched curve of mark point, or by the way of spline interpolation, the fitting for obtaining mark point is bent
Line.
In order to cover tire ground connection mark, the laser in the step (1) is "-" type laser.
Guarantee the precision of mark acquisition, camera is low distortion camera lens industrial camera in the step (2).
Facilitating the clear reliable mark of acquisition, Gamma is transformed to one-parameter setting inverible transform in the step (3), and two
Value transform method is adaptive two-tone images algorithm.In the step (4) at tire rotating direction left and right sides edge, ground connection
Midpoint and the ground connection inner position of mark two sides shoulder between mark front and back vertex position, ground connection mark vertex edge.
In order to obtain ideal matched curve for different marks, spline interpolation is using segmentation batten in the step (4)
Or Bezier spline is realized.
The utility model has the advantages that the present invention is able to carry out fast and accurately mark boundary for the tire of different in width, decorative pattern, load
Measurement promotes the regioselective accuracy of boundary marker point using image processing techniques, be fitted by semi-automatic mark point or
The method of interpolation, the curve that can fast implement tire footprint boundary extract, and the present invention has precision height, speed fast, adaptable
The advantages of, the problem of existing tire wear test macro is unable to measure different rib tire ground connection marks is overcome, there can be effect
For Tire testing industry spot.
Detailed description of the invention
Fig. 1 is the flow chart of tire static load mark measurement method of the present invention；
Fig. 2 is mark boundary marker point selection schematic diagram；
Fig. 3 is static mark measuring system structure chart.
Specific embodiment
The present invention will be described with reference to the accompanying drawing.
As indicated at 3, tire static mark test macro includes testing stand and work station 8, testing stand include common rack 3 with
And glass table top 4, tire 1 is acted on by load and contacts to form mark with glass table plate 4 when system works, and two lasers 2 divide
It is not erected at tire front and rear sides, connect using WIFI with work station 8 and receives control.2 sets of LED are fixed with below glass table plate
Lighting source 5, LED light source is connected with controller 7 and receives control, while controller 7 is connected with work station 8.Glass platform
Camera 6 is provided with immediately below plate to acquire tire ground connection print images.Tire and glass table top occur under the action of load
Contact forms contact surface.Camera is fixed on immediately below glass table plate, before guaranteeing that the scope of sight of camera can cover tire simultaneously
It is followed by ground boundary.
Two sets of LED illumination light sources are fixed along tire direction of travel two sides in glass table plate, the method illuminated using low angle,
LED light source irradiating angle is adjusted, so that the angle of LED illumination direction and glass table top is smaller, guarantees that camera will not be because of glass platform
The reflective interference of plate.LED light source is adjusted to appropriate brightness, so that mark of correlation point on tire, the details such as decorative pattern can be by camera
It captures, while light-source brightness excessively high cannot prevent from interfering laser.
As illustrated in fig. 1 and 2, the front and back edge on tire interface ground is carried out respectively using two high power "-" type lasers
Irradiation needs that laser is first adjusted to level before use, guarantees that laser can be parallel with tire and ground Contact Boundary when irradiation.
Laser illumination angle is adjusted later, so that then laser irradiation adjusts laser thickness, so that laser on tire ground connection boundary
Lines can cover entire tire ground connection boundary curve.Fine tuning laser angle reaches tire ground connection boundaries on either side contrast
It is maximum.
Present tire, which is acquired, by camera is grounded print images.Gamma transformation is carried out to image, improves what laser was irradiated
Tire is grounded the contrast on boundary, the gray value of borderline region image is stretched to larger range from a smaller range, then
Median filtering and opening operation are carried out to image again, remove the cavity in salt-pepper noise and trace, obtains binary image, due to figure
Laser is lower according to the gray value opposing tire background gray levels for burning mark as in, and need to be converted by Gamma improves picture contrast,
Increase low gray level areas.The process of binaryzation is that computer is facilitated to carry out subsequent processing, and different moments are not in tire moving process
Different with reflection case of the position for LED illumination light, binary conversion treatment can not be realized by a fixed threshold, it is therefore desirable to
Binarization threshold is chosen automatically according to light conditions using adaptive two-tone images algorithm.Mark binary image is grounded in tire
On on mark boundary choose mark point, according to the number of mark point and position, the method that curve matching may be selected, approximating method makes
It is generated ground connection mark curve according to the difference of footprint shape with least square method and is selected if ground connection footprint shape is arc
The curve of lower number is fitted, if ground connection footprint shape has more bending, selects corresponding height according to curved quantity
Secondary curve matching.Generally at tire rotating direction left and right sides edge, it is grounded vertex position, ground connection mark vertex before and after mark
Mark point is chosen in midpoint and the inner position of ground connection mark two sides shoulder between edge, wherein the label at left and right sides edge
Point is the size in order to determine contact patch region, and the mark point of ground connection mark vertex position is to determine mark maximum deflection
Degree, the mark point for being grounded midpoint between the edge of mark vertex is shape in order to depict curve, is grounded mark two sides shoulder
The mark point of the inner position in portion is the inflection point in order to determine mark.The ground connection mark bending degree at top is lower in Fig. 2, uses 4
Secondary curve can be obtained better effects, and the ground connection mark two sides bending degree of bottom is higher, it is necessary to be carried out using 6 curves
Fitting.Spline Interpolation Method can also be used by being grounded mark Drawing of Curve, for irregular ground connection mark, selection segmentation batten
Method, choose greater number of mark point and be fitted for irregular area.For more regular ground connection mark, can adopt
With Bezier spline, can avoid in curve matching because degree of curve is excessively high and bring over-fitting, final fitting acquisition
It is grounded mark curve.
Claims (6)
1. a kind of tire static load mark measurement method, which comprises the following steps:
(1) the front and back engagement edge of laser transmitting laser beam irradiation tire and glass table plate, makes light beam sufficiently be bonded tire and connects
Destination edge；
(2) dark-field manner is used, places the cameras at below glass table plate and captures tire ground connection mark, acquire under different loads
It is grounded print images；
(3) Gamma transformation and binary conversion treatment are carried out to the ground connection print images of acquisition, obtains binary image；
(4) mark point is chosen on mark boundary on tire ground connection mark binary image, it is bent according to ground connection mark form selection
Line is fitted order, obtains the matched curve of mark point, or by the way of spline interpolation, obtains the matched curve of mark point.
2. tire static load mark measurement method according to claim 1, which is characterized in that in the step (1)
Laser is "-" type laser.
3. tire static load mark measurement method according to claim 1, which is characterized in that phase in the step (2)
Machine is low distortion camera lens industrial camera.
4. tire static load mark measurement method according to claim 1, which is characterized in that in the step (3)
Gamma is transformed to one-parameter setting inverible transform, and binaryzation transform method is adaptive two-tone images algorithm.
5. tire static load mark measurement method according to claim 1, which is characterized in that in the step (4)
At tire rotating direction left and right sides edge, ground connection mark before and after vertex position, ground connection mark vertex edge between midpoint and
It is grounded the inner position of mark two sides shoulder and chooses mark point.
6. tire static load mark measurement method according to claim 1, which is characterized in that sample in the step (4)
Interpolation is realized using segmentation batten or Bezier spline.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811213446.7A CN109447959A (en) | 2018-10-17 | 2018-10-17 | Tire static load mark measurement method |
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| CN201811213446.7A CN109447959A (en) | 2018-10-17 | 2018-10-17 | Tire static load mark measurement method |
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| CN201811213446.7A Pending CN109447959A (en) | 2018-10-17 | 2018-10-17 | Tire static load mark measurement method |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN111340799A (en) * | 2020-03-18 | 2020-06-26 | 华南理工大学 | Method and system for determining contact stress between tire and rough road surface |
| CN113968232A (en) * | 2020-07-23 | 2022-01-25 | 易瑞博科技（北京）有限公司 | Method and device for determining tire load, storage medium and vehicle-mounted equipment |
| CN115451823A (en) * | 2021-06-08 | 2022-12-09 | 海安橡胶集团股份公司 | Giant tire load measuring tool and measuring method |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111340799A (en) * | 2020-03-18 | 2020-06-26 | 华南理工大学 | Method and system for determining contact stress between tire and rough road surface |
| CN111340799B (en) * | 2020-03-18 | 2023-03-10 | 华南理工大学 | Method and system for determining contact stress between tire and rough road surface |
| CN113968232A (en) * | 2020-07-23 | 2022-01-25 | 易瑞博科技（北京）有限公司 | Method and device for determining tire load, storage medium and vehicle-mounted equipment |
| CN113968232B (en) * | 2020-07-23 | 2023-08-01 | 易瑞博科技（北京）有限公司 | Method and device for determining tire load, storage medium and vehicle-mounted equipment |
| CN115451823A (en) * | 2021-06-08 | 2022-12-09 | 海安橡胶集团股份公司 | Giant tire load measuring tool and measuring method |
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Application publication date: 20190308 |