line laser utilization in passenger tire testing.

by:UMeasure     2020-04-13
It is said that optical measurement is an interesting tool for analyzing different material properties and the product itself.
They play an important role in the rubber industry, where they are often used for product testing.
A relatively simple history of registered displacement of optical technology is divided (ref. 1).
The evolution of driving forces is determined by optical technology.
This is based on the relative displacement of the two grids.
This method can be used to measure speeds up to 200 m/s. In the study (ref. 2)
A measuring system based on triangle technology is proposed.
The analyzer consists of two CCD cameras and a line laser.
The system is able to measure the contours of space objects in combination with approximate contours.
An interesting topic for industry is to measure the surface deformation of the objects being measured, which are affected by higher temperatures, pressures and humidity (ref. 3). The non-
The contact measurement uses two CCD cameras for determining the image before and after the deformation of the object.
It is recommended to combine optical technology with electronic interference measurement technology.
The method is simple and applied in industry organizations.
The results of side wall deformation in dynamic state are studied and compared (ref. 4).
Local deformation is determined by the profile meter.
The second introduces a commercial system using two CCD cameras and determines the deformation of the side walls in a dynamic state.
The result is a full color image that can be compared with the finite element results. In work (ref. 5)
The authors present the features of the system that works in a dynamic state, the evaluation of these data, and the test conditions.
The test description of rubber samples in dynamic state is (ref. 6).
In this article, we introduce a non-
A contact optical system of a CCD camera that records the distortion of the laser wave
Measure the front part caused by the deformed object and introduce the possibility of using the system in the rubber industry.
Experimental arrangement and discussion the system is used to determine the profile change and tire width through the laser line module.
The shape of the line laser copies the outline of the object.
The length of the laser trajectory defines the width of the object.
The measuring device consists of laser, CCD camera, computer and software.
Figure 1 gives the principle measurement of the line laser method.
The line laser trajectory is positively shot in the object under test, and the CCD camera focuses directly on the laser trajectory.
The measurement of the deformation of the object is based on the detection of the shape change of the laser front wave. [
Figure 1 slightly]
The system needs to be calibrated before measurement.
The camera must be perpendicular to the object under test.
This determines the width and thickness of the object.
The system provides the possibility of three calibration test objects.
The baseline check gives a way to measure the displacement dependent on the laser line, which is created by connecting two endpoints.
In the first step, we tested the accuracy of the device in a static state.
The results are shown in figure 2.
The straight line represents the value measured by the proposed method, and the Blue Square value is measured manually with a measuring device with an accuracy of 0. 01 mm.
The repeatability of the measurements was also tested, and the results obtained were shown in Figure 3 and Figure 4.
The test object is a glass fabric laminate.
The results shown in figure 3 are obtained after the device is fully decomposed and measured ten times in a row.
The measurement accuracy is 170. 13 [+ or -]0. 03 ram.
The results shown in figure 4 show that the repeatability of the instrument is 10 times at a given measurement sample setting.
The accuracy obtained in this case is similar and equal to the value 170. 10 [+ or -]0. 02 mm. [FIGURES 2-4 OMITTED]
After obtaining preliminary information about the accuracy of the equipment, we introduce the application of this method in the static measurement of tires in the next section.
The simplest use of the proposed method is right and wrong.
Contact assessment of tire size.
By positioning the test tire in the bracket with the laser level, the setting of the camera and line laser, and the calibration of the whole device, we obtain the electronic picture of the tire in a digital form, the software can measure it point by point (Figures 5 and 6). [
Figure 5 & 6
Figure 8 shows an electronic picture of the real tire in figure 7.
It is possible to test tread wear using the same method. [
Figure 7 & 8
Then we tested the static performance of the tire.
For these measurements, we used the hydraulic support shown in figure 5.
The tires are illuminated near the tire contact area.
The deformation of the tire after applying the static load is shown in Figure 9. [
Figure 9 omitted
Next, we tested the slack condition after the tire stopped immediately from the speed of 100 km/h.
The results are shown in Figure 10.
Measurements are implemented on the testing machine described in figure 6. [
Figure 10 slightly]
After that, we began to measure the tires dynamically.
In the first step, we tested the equilibrium state of creating the tire size at a constant speed of 100 km/h.
The results of this experiment are shown in Figure 11.
It can be seen that the tire has reached the balance size after about 10 minutes of rolling. [
Figure 11 omitted]
Under steady state conditions, the deformation of the tire tread at different speeds is shown in Figure 12.
The implementation of the experiment is shown in figure 6.
The tires are illuminated in the contact area and on the testing machine. [
Figure 12:
Conclusion This method provides the possibility to measure the mean value of the dimension of the side wall and the tread on the defined position given by the laser trajectory.
The device has very good sensitivity at the [level]+ or -]0. 03 mm.
It is possible to achieve measurement in a static or dynamic state.
All results obtained are digitized and ready for use in finite element analysis.
Compared with the business system (Aramis)
, There is no need to place the pattern on the surface of the test sample.
On the other hand, a disadvantage of our system is local measurement (
Given by the position of the laser track)
The displacement of the mean value shall prevail
Balance condition.
The method is fast, cheap, easy to match and has good repeatability. References (1. )J. Degrieck and P.
Laboratory machinery, 42,298 (2002). (2. )T. H. Tsai, K. C. Fan and J. J.
MOU on Measurement Science and Technology, 190 (2002). (3. )J. F. Roman and V.
Moreno, Journal of Modern Optics, 653 (1999). (4. )P. Kostial, M.
Mokrysova, L. Kopal, M. Klabnik and P.
Record of the International Conference on Machine Dynamics in Poland (2004). (5. )P. Kostial, M. Mokrysova, I. Kopal, M. Klabnik and P.
Ziacik, the third youth seminar on Experimental Solid mechanics in Italy (2004). (6. )R Kostial, M. Mokrysova, I. Kopal, M. Klabnik and P.
Ziacik of Kautsch
Guomi and quince. , 7-8, 371 (2002).
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