Structure Optimization Design Of Stainless Steel Car Body Of Type B Metro

From the21st century, with the rapid development of urban rail transit in our coutry, themetro vehicle has been more and more widely used. Since stainless steel metro vehicle haslight mass, high strength, corrosion resistance and good safe characteristics, it has beenwidely used in railway vehicle field. Many researchers in rolling stock work and universitiesare devoted to developing stainless steel car body structure with high strength, stiffness andbetter dynamic performance, and optimizing the existing car body structure. Based on the Btype stainless steel metro vehicle developed by Tangshan railway vehicle co., LTD., this thesisproposed its finite elemet model, analyzed its structure property and put forward an improvedstructure. The main contents are as follows:1. The finite element model was established for the stainless steel car body of type Bmetro. Considered the body framework and sheeting structure together, the finite elementmodel was builded by shell element. This work laid a foundation for the comprehensiveanalysis of the strength. Stainless steel car body has a lot of solder joints, what leads to themesh generation irregular or even failure. Here, the meshing results were made morereasonable and the calculation results more accurate by increasing or decreasing hard spots.2. The proformance of stainless steel car body of type B metro was analyzed and thedesign defects were pointed out. Based on the established finite element model, and accordingto EN12663-2010standard requirement, the strength, stiffness and modal of body structurewere analyzed. The results show: the stiffness of car body met design requirements and thebottom bending of edge beam centre is10.36mm which is under one thousandth of lengthbetween bogie centres-12.6mm; the modal of car body met design requirements, and the firstorder vertical bending frequency is17.871Hz, the first order torsion frequency is14.811Hz,which avoid bogie frequency which is under2.0Hz; the strength of car body is insufficient,which mainly concentrates in two ends of side wall and the overlap region of the end beamand sleeper beam, those provide a reliable basis for car body structure optimization.3. The local improved design schemes of body structure were proposed. Acorrding to theresults, it adds reinforcement plates in the two ends of side wall and the overlap region of theend beam and sleeper beam. Check results show the strength meeting design demands; thestiffness changes greatly and its bottom bending of egde beam centre is12.46mm which is inthe allowable range; two results of inherent attribute of car body don’t change. The improvedscheme fully meets the design requirements and is consistent with the vehicle test results.