Method and structure for improving rigidity of subway vehicle antenna support

Abstract

The invention discloses a method and structure for improving the rigidity of an antenna support of a subway vehicle. A carbon fiber reinforcing pipe is installed in a steel pipe of the antenna support, the carbon fiber reinforcing pipe is closely attached to the steel pipe. The method specifically comprises the steps: welding the steel pipe to form a frame of the antenna support; machining the inner wall of the steel pipe through a steel pipe inner wall machine, so that a concave-convex surface is formed on the inner wall of the steel pipe, the carbon fiber reinforced pipe is tightly attachedto the inner wall of the steel pipe, and the carbon fiber reinforced pipe is fixed in the steel pipe through a positioning block; and welding the end support to complete the overall assembly of the antenna bracket. According to the method, the characteristics of high specific modulus and low density of the carbon fibers are utilized, the bending rigidity of the antenna support is improved under the conditions that the boundary dimension of the antenna support is not changed and the structural quality of the antenna support is not greatly improved, then the bending vibration dominant frequencyof the antenna support is improved, and the problem that the antenna support is broken is solved; meanwhile, the structure design is simple, the structure process is mature, and the design and production requirements of the antenna support can be met.

Description

technical field [0001] The invention relates to the technical field of rail vehicles, in particular to a method for improving the rigidity of an antenna bracket of a subway vehicle. Background technique [0002] The antenna bracket of the subway vehicle will have a fracture failure problem during the service process. The reason for the problem is that the wheel-rail excitation caused by the elastic track has a main frequency of 60 Hz, and the main frequency of the wheel-rail excitation is different from the bending main frequency of the antenna bracket. Coupling, the coupling vibration of the structure causes vibration fatigue fracture of the structure, and the condition of the vehicle line has been determined, and the rectification is difficult. In order to avoid coupling vibration, it is necessary to increase the bending stiffness of the antenna bracket, thereby increasing the main frequency of the bending vibration of the antenna bracket (the bending main frequency is incr...

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Problems solved by technology

[0003] According to the traditional steel structure design idea, if the bending stiffness of the structure is to be increased, the section size of the structure needs to be increased, and for the steel structure, a large mass will be increased while increasing the section size, and the increase in mass will reduce the structural modulus. Therefore, if the bending main frequency above 80Hz is to be realized, the cross-sectional size will be large according to the steel structure design principle, and the mass will be increased to more than 1.7 times that of the original scheme; since the bogie is a key part of the vehicle operation, the bogie frame The end is the most violent position on the bogie frame, and the increased mass will bring hidden dangers to the structural safety, so it is necessary to improve the relevant mounting seat to adapt to the installation of this large-size and high-mass antenna bracket, which will greatly increase the cost of structural improvement

Therefore, it is very difficult to improve the optimization and improvement of the antenna support by adopting the traditional steel structure optimization, the improvement effect is not ideal, and the improvement cost is high

[0004] The antenna bracket is a bracket structure for installing the antenna device on the bogie of a subway vehicle. In the Chinese patent "Antenna Equipment Fixing Device for Rail Vehicles" (Patent No. CN201510635173.5), the antenna bracket is a pure steel structure with a beam shape The bracket is limited by factors such as quality and safety, and cannot be designed to achieve a large bending stiffness. Considering the improvement needs of the antenna bracket structure and the structural installation and operating environment, the steel structure design idea in this scheme can no longer meet the requirements.

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