Method and system for measuring contact area of road surface and rubber based on X-ray CT (Computed Tomography) scanning image
A technology of contacting areas and scanning images, which is applied to measuring devices, instruments, scientific instruments, etc., and can solve problems such as low measurement accuracy
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specific Embodiment approach 1
[0021] Specific implementation mode one: as figure 1 As shown, a method for measuring a road surface and a rubber contact area based on an X-ray CT scan image in this embodiment comprises the following steps:
[0022] Step 1. Place the test piece of the road surface to be tested and the rubber block between two identical resin fixtures respectively. The resin fixture in the step 1 is as follows: figure 1 As shown, it includes: two upper and lower resin plates 1 with the same shape and size, use a pressure testing machine to load the upper resin plate to the set pressure, tighten the resin bolts on the upper and lower resin plates respectively, and the pressure value to be loaded remains set The pressure value remains unchanged, unload the pressure testing machine, and take out the loaded resin fixture;
[0023] Step 2. Use X-ray CT to perform tomographic scanning on the loaded resin fixture, set the scanning accuracy between adjacent tomographic images, and obtain multiple gr...
specific Embodiment approach 2
[0026] Specific embodiment 2: This embodiment is different from specific embodiment 1 in that the step 2 also includes:
[0027] According to the two peak ranges, the bimodal Gaussian distribution function is used to fit the gray value curve of the tomographic grayscale image. The expression of the bimodal Gaussian distribution function is:
[0028]
[0029] Among them, a 1 , b 1 、c 1 、a 2 , b 2 、c 2 Both are fitting parameters; x represents the gray value of the pixel, and the value range is [0,255]; y represents the frequency corresponding to the gray value of the pixel;
[0030] According to the obtained fitting parameter b 1 , b 2 , the gray value 0 and b 1 The mean value of is determined as the gray threshold of the gap, which is denoted as g1, and b 1 and b 2 The mean value of is determined as the gray threshold value of surface aggregate particles, which is denoted as g2.
[0031] Other steps and parameters are the same as those in Embodiment 1.
specific Embodiment approach 3
[0032] Specific embodiment three: the difference between this embodiment and specific embodiment one or two is that the four corners of the resin plate 1 are provided with a hole, and the distance from the center of the hole to the two adjacent sides is the same; the rubber material 2 and The road meter test piece 3 to be tested is placed between two resin plates, 4 screw rods pass through the holes at the four corners of the two resin plates, and 12 bolts are used to fix the rubber material 2 and the road meter test piece 3 to be tested; Compared with metal fixtures, resin fixtures have less influence on CT images and can be better used in CT scanning.
[0033] Other steps and parameters are the same as those in Embodiment 1 or Embodiment 2.
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Abstract
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