Method for constructing slab- girder structure of train body in analysis of train structure

Abstract

The invention relates to a method for constructing a slab-girder structure of a train body in the analysis of a train structure, which is used for solving the static force problem of a slab- girder combined structure in a train body steel structure. The method is characterized by comprising the following steps: constructing the slab-girder combined structure at a connection part of a girder unit and a slab unit, constructing an eccentric displacement relation of eccentric nodes when the slab unit is eccentrically connected with the girder unit; then formulating finite element programs constructing the slab-girder combined structure based on a penalty element method and a Lagrange multiplicator method respectively, wherein the finite element programs are respectively used for solving the static force problem of the slab- girder combined structure and the static force problem when the slab unit or the girder unit independently exists. The method can solve the contribution problem of theslab unit to the combined structure total rigidity matrix because of eccentric connection, has less total elements and nodes of the slab-girder combined structure, little occupation machine time of computation, low computation cost and results more accordant with practical situation, and is an effective method for constructing the slab-girder structure of the train.

Description

technical field [0001] The invention belongs to the field of reliability and safety analysis of vehicle structure strength, and in particular relates to a method for constructing a typical plate-girder composite structure model in the vehicle body structure in the finite element analysis and structural optimization design of the railway locomotive vehicle body structure. Background technique [0002] In recent years, with the continuous development of the railway industry, high speed and heavy load have become one of the important symbols of railway modernization. The increase of train speed and the increase of axle load put forward higher requirements on the safety and reliability of the main bearing parts (wheel sets, frame, car body, etc.) of rolling stock. For the railway transportation sector, the reliability and safety of railway transportation have always been the prerequisites for the development of railway transportation, and the reliability and safety of structural...

AI Technical Summary

Problems solved by technology

Among them, the finite element model established by the beam element has the advantages of less space and fast calculation speed, but the scope of use is narrow; while the plate shell element is the most economical and effective element for simulating thin plates, but because it assumes that the bending stress changes linearly along the thickness direction of the element , and in order to obtain ideal results, the plate and shell elements must be established on the neutral plane of the actual structure; the solid element is the most accurate element for calculation results, but in the calculation of bending deformation, in order to achieve the same effect as the plate and shell elements Accuracy, the solid unit must be divided more densely, which takes up a lot of space and computing time

Based on the above characteristics of beam elements, plate elements and solid elements, when performing finite element structural analysis on typical plate-beam combined structures in the construction of car body steel structures, if all solid elements are used, the grid will adapt to the geometric characteristics of the structure. The stiffness coefficients of the elements in different directions are very different, which leads to ill-conditioned or singular solution equations, and the total number of elements is relatively large; if all plate and shell elements are used, the overall stiffness of the structure will be too large, and because the total number of element nodes is too large, the actual Calculation time-consuming

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