Structural Reliability Research Of Key Component Of EMU Bogie

The traditional design methods through a single deterministic function transformation, this deterministic analysis intuitively clear, simple expression, but it is undeniable that their blindness, empirical and not a true reflection of the objective laws of the drawbacks is its Achilles heel. The structural failure is often due to the randomness of design variables which, reliability is the randomness in the form of probability measure of design variables and the corresponding amount between the transfer. Therefore, the use of probabilistic reliability design ideas design is a further development of traditional design, the objective to further deepen the understanding of things, can objectively describe information better. China has a vast territory, High-speed Rail service conditions are very complicated, so as to bring performance is sensitive to the change in service, the functional component or directly mounted on bogie frame, or indirect effect of vibration on the bogie frame to frame, service reliability is essential, so choose the bogie frame as the key parts for structural reliability analysis.In this paper, according to the Siemens test program on17combinations of load and10kinds of exceptional loads are analyzed by static analysis, the maximum Von. Mises stress in two kinds of conditions did not appear to exceed the allowable stress355MPa, are qualified. On the other hand, because the train during operation are subject to various external excitation, and the modal number of different order of damage contribution of different sizes, affect the position is also different, therefore, to avoid resonance, resulting in increase of wheel rail force, structure of the modal analysis and modal sensitivity. To prepare for the reliability analysis.In the reliability analysis, using the ANSYS PDS module and APDL language, the maximum stress conditions were selected as the object of study combined load cases and extraordinary load conditions, the static failure limit state equation for the failure mode, to describe the discrete selecting different types of distribution and parameters on the thickness, loading and material properties as input variable, the distribution form of partial load determined by Adams simulation, respectively, the application of Monte Carlo method and hybrid simulation method of structure reliability, the reliability sensitivity were calculated, and the implicit lim-it state equation was-fitted. Seen from the results, under the given conditions, the reliability is close to100%, while the latter95.1218%reliability, the reliability sensitivity analysis results of the latter can be seen, the allowable stress effect on the reliability is the most significant, followed by the traction motor force (front). Since then, the optimization design module based on the ANSYS, plate thickness as design variables, the maximum stress as the objective function, the latter was optimized, the optimized structure of the reliability increase to95.9005%, the optimization of thickness on the structural reliability influence was not significant.