Method and structure for improving rigidity of subway vehicle antenna support
A vehicle antenna and antenna bracket technology, which is applied in the field of rail vehicles, can solve the problems of steel structure design ideas that cannot meet the requirements, cannot design large bending stiffness, and reduce the main frequency of the structural mode, so as to achieve low density, easy replacement and installation, and optimization Effects on Structural Properties
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[0031] Example 1
[0032] Such as figure 1 with figure 2 As shown, in view of the above-mentioned problems existing in the actual operation of the subway, a method for improving the stiffness of the antenna support 3 of the subway vehicle is proposed. This method uses the characteristics of high specific modulus and low density of carbon fiber, and the steel pipe 4 of the antenna support 3 The carbon fiber reinforced tube 5 is installed inside, which improves the bending rigidity of the antenna support 3 without changing the external dimensions of the antenna support 3 and greatly increasing the structural quality of the antenna support 3, thereby increasing the main frequency of the bending vibration of the antenna support 3 The specific steps of the method in this embodiment are as follows:
[0033] Step 1. Weld the steel pipe 4 of the antenna support 3: Weld the steel pipe 4 to form the frame of the antenna support 3, and reserve the installation positions of the end supports 6...
Example Embodiment
[0038] Example 2
[0039] Such as image 3 As shown, in step 3 in embodiment 1, the carbon fiber reinforced tube 5 is continuously and uninterruptedly arranged in the steel pipe 4, and carbon fiber reinforced tubes 5 of different thicknesses are placed in the steel pipe 4, and the lengths of the carbon fiber reinforced tubes 5 are all 1540mm, do the bending mode mode shape experiment, get as Figure 4 Flexural mode shape diagram, analysis of the flexural mode shape experiment shows that Figure 5 The relationship between the wall thickness of the carbon fiber reinforced tube 5 and the bending mode frequency;
[0040] When the wall thickness of the carbon fiber reinforced tube 5 is 3 mm, the bending frequency of the steel tube 4 is 70 Hz;
[0041] When the wall thickness of the carbon fiber reinforced tube 5 is 4 mm, the bending frequency of the steel tube 4 is 84 Hz;
[0042] When the wall thickness of the carbon fiber reinforced tube 5 is 5 mm, the bending frequency of the steel tube...
Example Embodiment
[0045] Example 3
[0046] Such as Image 6 As shown, the difference with embodiment 2 is that in step 3 in embodiment 1, the carbon fiber reinforced tube 5 is distributed symmetrically in multiple sections in the steel pipe 4, and from the middle to the two ends of the steel pipe 4, the carbon fiber reinforced tube The length of 5 becomes shorter in turn, and the positions of the carbon fiber reinforced tubes 5 are fixed by positioning blocks 7.
[0047] in Figure 4 In the bending mode diagram, the middle of the steel pipe 4 is the area where the stiffness changes the most, and it is also the area where cracks occur. The steel pipe 4 has lower and lower requirements on the rigidity of the structure from the middle to the two ends, so the middle of the steel pipe 4 is the structure The two ends of the steel pipe 4 are non-key strengthening positions.
[0048] Preferably, the length of the carbon fiber reinforced tube 5 in the middle of the steel tube 4 is 600 mm, and the thickness ...
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