Modification optimization-based fatigue life analysis and improvement of EMU gear
International Journal of Structural Integrity
ISSN: 1757-9864
Article publication date: 24 August 2021
Issue publication date: 28 October 2021
Abstract
Purpose
This paper proposes an improved fatigue life analysis method for optimal design of electric multiple units (EMU) gear, which aims at defects of traditional Miner fatigue cumulative damage theory.
Design/methodology/approach
A fatigue life analysis method by modifying S–N curve and considering material difference is presented, which improves the fatigue life of EMU gear based on shape modification optimization. A corrected method for stress amplitude, average stress and S–N curve is proposed, which considers low stress cycle, material difference and other factors. The fatigue life prediction of EMU gear is carried out by corrected S–N curve and transient dynamic analysis. Moreover, the gear modification technology combined with intelligent optimization method is adopted to investigate the approach of fatigue life analysis and improvement.
Findings
The results show that it is more corresponded to engineering practice by using the improved fatigue life analysis method than the traditional method. The function of stress and modification amount established by response surface method meets the requirement of precision. The fatigue life of EMU gear based on the intelligent algorithm for seeking the optimal modification amount is significantly improved compared with that before the modification.
Originality/value
The traditional fatigue life analysis method does not consider the influence of working condition and material. The life prediction results by using the method proposed in this paper are more accurate and ensure the safety of the people in the EMU. At the same time, the combination of intelligent algorithm and gear modification can improve the fatigue life of gear on the basis of accurate prediction, which is of great significance to the portability of EMU maintenance.
Keywords
Acknowledgements
The paper is supported by “National Natural Science Foundation of China” (51875073), “Scientific Research Project of Education Department of Liaoning Province” (JDL2019005) and “Dalian Science and Technology Innovation Fund Plan” (2019J11CY017). The author would like to express his gratitude to their support to this research.
Citation
Li, Y.-H., Zhang, C., Yin, H., Cao, Y. and Bai, X. (2021), "Modification optimization-based fatigue life analysis and improvement of EMU gear", International Journal of Structural Integrity, Vol. 12 No. 5, pp. 760-772. https://doi.org/10.1108/IJSI-07-2021-0072
Publisher
:Emerald Publishing Limited
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