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《Journal of the China Railway Society》 2008-05
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Light Weight Design of Welded Vehicle Structure with Fatigue Damage Constraints

DING Yan-chuang,ZHAO Wen-zhong(School of Mechanical Engineering,Dalian Jiaotong University,Dalian 116028,China)  
Considering the light-weight and fatigue life problems of the welded vehicle structure,a light-weight design method with weld fatigue damage constraints is presented.Using the International Institute of Welding(IIW) standards for assessing the fatigue of welded joints,based on the Miner cumulative damage theory,the accumulated fatigue damages of welded joints are predicted.Adding weld fatigue damages constraints to conventional constraints such as stresses and displacement and aiming at the minimum mass of the vehicle structure,the light-weight model of the welded vehicle structure is designed.The optimization strategy based on Finite Element Analysis(FEA) is studied.Design of Experiment(DOE) is used to provide sample points,and the approximation model for FEA is constructed.The numerical optimization algorithm is followed to seek the optimum solutions.This strategy enhances the optimization computation efficiency.Using this method the light-weight design of the welded bogie frame is carried out.The uniform design method is used on 14 design variables for 50 tests.The Radial Basis Function(RBF) Neural Net Model is constructed on the basis of the sample data.The sequential quadratic programming algorithm is applied,reducing the mass by 12.5% with fatigue damage constraints.The practical example proves the feasibility and practicality of the proposed method.
【CateGory Index】: U270.2
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