Global Sensitivity Analysis of Single-Point Levitation System for High-Speed Maglev Train Based on Sobol’ Method

NI Fei; FAN Lin; XU Junqi; LIN Guobin; JIA Wantao

doi:10.3969/j.issn.0258-2724.20240545

Volume 60 Issue 4

Aug. 2025

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Journal of Southwest Jiaotong University > 2025 > 60(4): 812-822.

NI Fei, FAN Lin, XU Junqi, LIN Guobin, JIA Wantao. Global Sensitivity Analysis of Single-Point Levitation System for High-Speed Maglev Train Based on Sobol’ Method[J]. Journal of Southwest Jiaotong University, 2025, 60(4): 812-822. doi: 10.3969/j.issn.0258-2724.20240545

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NI Fei, FAN Lin, XU Junqi, LIN Guobin, JIA Wantao. Global Sensitivity Analysis of Single-Point Levitation System for High-Speed Maglev Train Based on Sobol’ Method[J]. Journal of Southwest Jiaotong University, 2025, 60(4): 812-822. doi: 10.3969/j.issn.0258-2724.20240545

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Global Sensitivity Analysis of Single-Point Levitation System for High-Speed Maglev Train Based on Sobol’ Method

doi: 10.3969/j.issn.0258-2724.20240545

NI Fei^{1, 2
,},
FAN Lin^{2, 3},
XU Junqi^{1, 2},
LIN Guobin^{1, 2},
JIA Wantao^{4
,
,}

1.
National Maglev Transportation Engineering R & D Center, Tongji University, Shanghai 201804, China
2.
State Key Laboratory of High-Speed Maglev Transportation Technology, Shanghai 201804, China
3.
College of Transportation, Tongji University, Shanghai 201804, China
4.
School of Mathematics and Statistics, Northwestern Polytechnical University, Xi’an 710129, China

Received Date: 19 Oct 2024
Rev Recd Date: 27 Jan 2025

Available Online: 17 Apr 2025

Publish Date: 27 Feb 2025

Abstract

Abstract

The impact of uncertain parameters on the dynamic response of the high-speed maglev train levitation system was investigated, aiming to provide a theoretical foundation for the optimal design of maglev trains. Firstly, the high-speed maglev train levitation system was simplified to a single-point levitation system incorporating secondary suspension, and a corresponding polynomial chaos expansion (PCE) model was established. On this basis, the Sobol’ method was employed for global sensitivity analysis. Compared to the method of solving Sobol’ sensitivity through Monte Carlo simulation on the original model, the PCE-based approach enhances computational efficiency by 73 times while maintaining the calculation error within 0.004. Furthermore, the influence patterns of vehicle structural parameters, track irregularity parameters, and levitation control parameters on the levitation gap response and the vertical acceleration of the train body were analyzed, identifying key influencing parameters and their interaction effects. The results indicate that the coil turns of the electromagnet and the effective area of the electromagnet core significantly affect the vertical acceleration of the train body and the levitation gap response, with total sensitivity indexes exceeding 0.20, whereas the electromagnet mass and the secondary suspension parameters have a relatively minor impact, with total sensitivity indexes less than 0.10. The train operating speed and track irregularity wavelength significantly influence the levitation gap and the vertical acceleration of the train body, with total sensitivity indexes exceeding 0.80 and a notable interaction effect between the two. Among the levitation control parameters, the gap response is most sensitive to changes in the proportional coefficient, with the total sensitivity index approaching 1.00.
- high-speed maglev train,
- electromagnetic levitation system,
- sensitivity analysis,
- Sobol’ method,
- polynomial chaos expansion

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Global Sensitivity Analysis of Single-Point Levitation System for High-Speed Maglev Train Based on Sobol’ Method

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Global Sensitivity Analysis of Single-Point Levitation System for High-Speed Maglev Train Based on Sobol’ Method

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