Tire Testing Interferometric Sector Angle Configuration
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Solution Overview
Problem
Existing tire testing methods using interferometric techniques are time-consuming due to the need for multiple pressure changes and rotations to cover the entire tire surface, and the use of multiple sensitive measuring systems increases maintenance costs and image distortion at the edges.
Innovation Solution
A device and method that utilizes a pressure chamber, external and internal measuring heads, and a rotating mechanism to divide the tire into sectors, allowing for complete testing in two cycles with one pressure change and one rotation, using a defined sector angle configuration to minimize measurement time and maintain image quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If multiple measuring systems are used to simultaneously capture more sectors, then the inspection time is reduced, but the cost and maintenance requirements increase significantly
Solution Approach 1:
The tire testing process is segmented into two sequential cycles with different pressure conditions (first cycle at first ambient pressure, second cycle at second ambient pressure). Each cycle captures different sectors of the tire, allowing complete inspection without requiring multiple simultaneous measuring systems. The measuring head remains single and stationary while the tire rotates to present different sectors for measurement.
Solution Approach 2:
The tire is rotated by a rotating device between measurements to periodically present different sectors to the measuring head. The testing proceeds in periodic cycles with pressure changes and rotations, allowing a single measuring system to capture data from all tire sectors over time rather than requiring multiple systems operating simultaneously.
2Productivity
If the field of view is increased to reduce the number of sectors to inspect, then the inspection time is reduced, but image distortion at edges increases
Solution Approach 1:
Instead of using a single static measuring head position with a wide field of view that causes edge distortion, the system dynamically rotates the tire to bring different sectors into the optimal measurement zone. The measuring head maintains a fixed position with optimized field of view, while the tire's rotation dynamically presents different areas for measurement, avoiding edge distortion issues.
Solution Approach 2:
The solution adds the dimension of tire rotation to the measurement process. Rather than trying to capture all sectors simultaneously in one wide-angle view (2D approach), the system uses sequential capture through rotation (adding temporal and angular dimensions), allowing each sector to be measured individually with optimal image quality.
3Area of stationary object
If the tire is rotated intermittently to detect the entire tire section by section, then complete coverage is achieved, but the test cycle duration increases
Solution Approach 1:
The tire rotation and measurement process is made continuous rather than intermittent. The rotating device continuously rotates the tire through the measurement zone, and the measuring head continuously captures data throughout the rotation. Pressure changes occur continuously between cycles, eliminating idle time and making the entire testing process a continuous useful action rather than a series of stopped-and-start measurements.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The solution significantly reduces the testing time of tires by allowing complete coverage in two cycles with minimal distortion and maintenance, utilizing a defined sector angle configuration and rotating mechanism to optimize sector detection.
Implementation Method 1
the pressure chamber must be pressurized several times... the pressure chamber is designed to subject the tire (100) to be tested to a predetermined pressure
Implementation Method 2
an interferometric, preferably a so-called shearographic, measuring method... the shearogram, which characterizes the gradient of deformation, is generated by subtracting the intensities of the interferograms
Data Source
Figure 1~2
Figure 3~4b
Figure 5~6a
AI summary
A device (10) for testing tires (100) using an interferometric measuring method comprises a pressure chamber (20) in which the tire (100) to be tested can be subjected to a predetermined pressure (ρND, ρPD), a base frame (30) on which the tire (100) can be stored lying down, and a measuring device (40). The tire (100) has a first sidewall (110), a second sidewall (120), and a tread (130), each of which can be divided into a plurality of sectors (S1.1 to S1.4; S2.1 to S2.4; L1 to L8) to be detected, each of which is delimited by two sector lines (SL1.1-A1 to SL2.4-A2; SL1-L1 to SL8-L2) that are at a predetermined sector angle (α, β) to one another. The measuring device (40) has N external measuring heads (42) which are designed to form a sector (S1.1 to S1.4; S2.1 to S2.4) of the first sidewall (110) and/or the second sidewall (120), and N internal measuring heads (44) which are designed to detect a sector (L1 to L8) of the tread (130). N is a natural number. The device comprises a rotating device (32, 46) for rotating the tire (100) and/or the measuring device (40) by a predetermined angle of rotation (φ-DA). The device is characterized in that the first sector angle (α) has the value of the formula: 360°N⋅2; and in that the second sector angle (β) has the value of the formula: 360°N⋅4. The size of the angle of rotation (φ-DA) corresponds to the value of the first sector angle (α).