KR19980035180A - How to calibrate test conditions for tires - Google Patents

Abstract

In order to evaluate the test conditions of the tires, the test performance data are measured using a monitoring tire, and the test condition data are measured, and the test conditions are reset or measured during actual measurement so that the desired test conditions can be obtained from the measured test condition data. By correcting the data value by the information extracted from the test condition data, the tire performance evaluation test eliminates the deviation according to the ambient conditions, thereby improving the reliability of the tire performance test.

Description

How to calibrate test conditions for tires

1 is a block diagram of a general tire durability tester,

2 is a configuration diagram of a test condition evaluation system for tires according to the present invention;

3 is a test condition evaluation result data of a tire according to the present invention.

* Description of the symbols for the main parts of the drawings *

1: road wheel 2: driving path

3: tire 4: carriage

5: axis of rotation 6: accelerometer

7: amplifier 8: frequency analyzer

9: register

The present invention relates to a method for correcting a test condition of a tire, and more particularly, to a method of evaluating and correcting a test condition of a tire by extracting data on a test environment of a tire using a monitoring tire.

The purpose of the indoor dynamic performance test of a tire is to observe various characteristics of a tire running by applying a load and a speed to the tire using various test equipments. However, various conditions around the tester may affect the data values actually measured. Here, the conditions affecting the measured values include the effects of the tester itself, especially the wear of the bearings or shafts and other abnormalities of the accessories, and the effects of aging due to long-term use of the tester. This may include, for example, the effects of equipment integrity, and the effects of environmental conditions.

In particular, the magnitude of noise and vibration is one of the major indicators of tire performance, but many differences can occur in the measured values due to the various conditions as described above. This difference in measurement can occur in the same tire, depending on the condition of the tester or the surrounding environment, and can also occur when testing in different testers.

1 shows a configuration of a general tire indoor driving tester. In the indoor traveling tester as shown in FIG. 1, the wheel wheel 1 rotates as the motor is transmitted by the belt connection, and the carriage 4 moves between the driving paths 2 so that the tire rotation shaft 5 The tire 3 is mounted on the road wheel to drive the tire. In order to determine the characteristics of the tire while driving the tire in this way and measure the noise and vibration. However, in the conventional measurement test as described above, only the measured value was calculated without considering the deviation of the data according to the surrounding environment as described above. Therefore, there were many variations in the test results depending on the surroundings or the surrounding environment depending on the tester.

The present invention has been made to solve the problems of the conventional tire performance evaluation test method as described above, and an object of the present invention is to provide a test condition evaluation method of a tire that can correct the deviation of the test results according to the tester or the surrounding environment. do.

In order to achieve the above object, the present invention selects a reference tire, i.e., a monitoring tire, and measures the values of the frequency range, magnitude, and the like of the vibration occurring during the test of the monitoring tire and the shape of the frequency to affect the measured value. The difference between the measured values under various conditions is identified and reflected in the actual tire performance test to correct the deviation of the test results under various conditions. The monitoring tire is a tire that can be used as a standard for testing. It may be a tire that is generally used, but may be a tire that is specially manufactured in a non-pattern, and a tire that has no problems in uniformity and durability. .

Hereinafter, the present invention will be described in detail by taking one embodiment of the present invention as an example.

2 is a schematic diagram of one embodiment for practicing the method of the present invention.

In this embodiment, after the monitoring tire 3 is mounted on the indoor travel tester, the tire 3 is driven by bringing the tire 3 into contact with the road wheel 1 while rotating the road wheel 1. At this time, the vibration phenomenon generated while the tire 3 rotates in the driving tester is sensed by the accelerometer 6, and the amplified signal is thus amplified using the amplifier 7 and input to the frequency analyzer 8. Depending on the measurement equipment, the amplifier may be omitted (the difference in specifications between companies). The frequency analyzer takes the amplified signal inputted and outputs the frequency data. At this time, the output data can be input to the recorder 9 to obtain data on the process of fluctuation of frequency appearing over a long time.

The frequency data thus obtained is shown in FIG. The frequency data obtained by testing the monitoring tires will vary depending on the test conditions. Therefore, after measuring the frequency data by the monitoring tire in the same manner as in the above method during the performance evaluation test of the tire, if the magnitude or area of the frequency is different from the reference data, the test conditions are changed. Performance tests shall be carried out after the various conditions are adjusted until agreement is reached.

When evaluating the test conditions of the tires by the monitoring tires, it is important to note that if the driving speed is too high during the testing of the monitoring tires, the high-speed driving should be avoided as much as possible because the wear of the tread and the life of the monitoring tires are shortened. In addition, there is a test that can be conducted continuously on the same day as the high speed test (High Speed Performance), but a long test period is required for the purpose of measuring the general durability. If testing is performed on the same day, if two test tires are used, first adjust the test conditions with the monitoring tires, then perform the performance evaluation test on the first test tire, and then perform the performance evaluation test on the second test tire. Conduct. However, if the test is carried out on another day or with a different tester, the test conditions for the test of the first tire and the test of the second tire are likely to be different. The test conditions shall be adjusted by performing a tire test condition evaluation.

Using this method, since the performance evaluation test can be performed after setting the correct test condition without the deviation caused by the tester or the test time, the accurate test result can be obtained.

As another example, the change in the frequency data at this time may be measured while changing the test conditions, and then the correction amount of the performance evaluation test result may be calculated accordingly. That is, the variation of the frequency data according to various test conditions is measured in advance, and the change of the performance evaluation test result value is measured at this time, and then the test result value is corrected according to the deviation of the frequency data at the time of the actual measurement.

By using this method, accurate test results can be obtained even under various test conditions, thereby increasing the reliability of the tire performance evaluation test.

Claims (4)

A test condition correction method of a tire having a tire performance evaluation test using a monitoring tire, measuring test condition data, and resetting test conditions to achieve a desired test condition from the measured test condition data. . The method for calibrating a test condition of a tire according to claim 1, wherein the method for measuring the test condition data uses a frequency analysis method of vibration generated during a test. Measuring the test condition data while performing the tire performance evaluation test using the monitoring tire, performing the performance evaluation test with the tire under test, and correcting the result of the performance evaluation test from the measured test condition data. The test condition correction method of the tire provided. 4. The method of claim 3, wherein a frequency analysis method of vibration generated during the test is used as a method for measuring the test condition data.