| The welded bogies of CW-200 speed-up passenger car have been subjected to more worse loading conditions under the operation. It indicates: key component fatigue and structural optimum design have been one of critical factor which restricts the reliable operating and cost of bogies. Therefore, this paper studied anti-fatigue design of CW-200 welded bogie, based on the UIC615-4/UIC515-4 standard which is specified fatigue loading test and the S-N curve date which is offered by the IIW, and the structure topological optimization based on variable-density method, which has engineering significance. This article mainly aims at following aspects:Firstly, the static strength of the CW-200 passenger car bogies was analyzed with I-DEAS software and the stiffness and strength weakness of the frame could be found through researching the regularity of deformation and stress region. Then, the position of fatigue life estimation, namely static attention point, was determined according to the analysis results. This paper also gave the analyses of multi-design schemes for offering reference of the fatigue life estimation.Secondly, based on the S-N curve, the fatigue life of welded bogie frame was predicted with the Palmagren-Miner cumulative damage rule to the welded joint feature of passenger car bogie frame according to fatigue loading test by the UIC615-4/UIC515-4 standard. The best design scheme of welded bogie frame was confirmed from the fatigue view.Lastly, the new pivoted arm structure was created depending on technics feasibility and topological optimization result by using Hypermesh /Optistruct software and multi-body contact FEM was analyzed based on I-DEAS software. Based on variable-density method and non-linear contact finite element method, the multi-body contact analysis results of the new pivoted arm show that, comparing with original structure, the stress distribution was more even, and the mass was decreased 9.7%.
|
PDF Full Text Request