Method for analyzing fatigue strength of brake control device on basis of finite element

Abstract

The invention relates to a method for analyzing a fatigue strength of a brake control device on the basis of a finite element. The method comprises the following steps of: extracting a middle plane of an air cylinder hanger, setting a thickness and then carrying out finite element meshing on each part of the brake control device; carrying out welding binding constraint on the air cylinder hanger and an air cylinder; applying masses to mass centers of the air cylinder and a gas circuit board and carrying out mass center coupling; modeling, setting boundary conditions, applying a load and carrying out vibration shock simulating calculation; and carrying out fatigue calculation and converting recycling times into a service life. The invention not only considers a welding method and a processing mode of the brake control device, but also considers the direction and the order of magnitude, of the applied vibration shock, and is based on a vibration shock outline standard; on one hand, the service life of the brake control device can be precast according to a simulation result, so that the structure of the brake control device is optimally designed; and on the other hand, a variation model of performance parameters can be established on the basis of the simulation result, and the design period and the design cost of the brake control device can be reduced.

Description

technical field [0001] The invention relates to a method for analyzing the fatigue strength of a braking control device of a rail vehicle, in particular to a method for analyzing the fatigue strength of a braking control device for a high-speed train set, belonging to the technical field of high-speed train sets. Background technique [0002] At present, the maximum operating speed of CRH2 EMUs in domestic operation has exceeded 300km / h. As a key component of the braking system of the train, the brake control device has high requirements for the safety and reliability of the fatigue strength of the device. Domestic verification methods for the fatigue strength of brake control devices generally adopt empirical structural design, and shock vibration tests are performed after the device is processed to verify whether the fatigue strength of the device meets the requirements. Its disadvantages are: the design cycle of the device is increased, and once the device structure does...

AI Technical Summary

Problems solved by technology

The disadvantages are: the design cycle of the device is increased, and once the device structure does not meet the requirements after the test, it needs to be redesigned, which increases the design cycle; the design cost of the device increases, and every time a device structure is designed, it must be tested to verify fatigue. Whether the strength meets the requirements, the number of tests is large, and the test cost increases