Abstract
In this article, a new fatigue life analysis method based on six sigma robust optimization is proposed, which considers the random effects of material properties, external loads, and dimensions on the fatigue life of a pantograph collector head support. Some main random factors are identified through fatigue reliability sensitivity analysis, which are used as input variables during fatigue life analysis. The six sigma optimization model is derived using the second-order response surface method. The response surface is fitted by the Monte Carlo method, the samples are obtained by the Latin hypercube sampling technique, and the proposed model is optimized using the interior point algorithm. Through the optimization, the collector head support weight is reduced, the mean and the standard deviation of fatigue life have been decreased, and the effect of design parameter variation on the fatigue life is reduced greatly. The robustness of fatigue life prediction of collector head support is improved. The proposed method may be extended to fatigue life analysis of other components of electric multiple units.
Highlights
The pantograph is one of the most important electric equipments in the electric multiple units (EMU), which collects the electric power from catenary for the EMU
Fatigue life analysis based on six sigma robust optimization model is as follows min F1⁄2uN (Ti), sN (Ti)
This article analyzed the fatigue life based on six sigma robust optimization method for pantograph collector head support (CHS)
Summary
The pantograph is one of the most important electric equipments in the electric multiple units (EMU), which collects the electric power from catenary for the EMU. The pantograph is mainly composed of collector head support (CHS) and carbon slipper, which is subjected to shock loads between carbon slipper and contact wire.[1] The working conditions of pantograph are becoming worse and worse with the increasing speed of the EMU. The pantograph has been subjected to variable loadings due to the uneven track, the impact force of pantograph and catenary, and the air flow force, which may cause fatigue damage of the pantograph, shorten its service life, and affect the safety and reliability during EMU operation.[2,3] When the pantograph worked for a period, some cracks were found in the pantograph CHS and the vane where fatigue failure may occur. To ensure the normal usage of pantograph and reduce accident occurrences, it is necessary to investigate the fatigue life and reliability of the pantograph CHS
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