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Z.-W. Chen^1,2 and Y.-Q. Ni^1,2

¹National Rail Transit Electrification and Automation Engineering Technology Research Center (Hong Kong Branch), Hung Hom, Kowloon, Hong Kong SAR, China
²Department of Civil and Environmental Engineering, The Hong Kong Polytechnic University, Hung Hom, Kowloon, Hong Kong SAR, China

doi:10.4203/ccc.1.18.3

Z.-W. Chen, Y.-Q. Ni, "Parameter optimization with respect to elongated hillock regions beside the high-speed railway under crosswinds", in J. Pombo, (Editor), "Proceedings of the Fifth International Conference on Railway Technology: Research, Development and Maintenance", Civil-Comp Press, Edinburgh, UK, Online volume: CCC 1, Paper 18.3, 2022, doi:10.4203/ccc.1.18.3

Keywords: windbreak wall, crosswind, high-speed railway, NSGA-?.

Abstract

Complex terrains will result in elongated hillocks occurring near the windbreak wall along high-speed railways, furthermore, the hillock weakens the anti-wind ability of the windbreak wall. In this paper, characteristic parameters - the distance between hillock and windbreak wall (D) and the hillock height (H) are optimized by capitalizing on computational fluid dynamics (CFD) and multi-objective optimization method of the Non-dominated Sorting Genetic Algorithm II (NSGA-II). The surrogate model of Kriging model is advantaged and it is to be the final surrogate model to optimize the maximum wind speed Umax and peak-to-peak value Up-p for the railway concerned. The optimized results demonstrate that D = 25 – 35 m and H = 2 – 12 m can ensure that Umax < 0.5. Besides, it is shown that distance D plays a key role in reducing the sudden wind peak values.

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Front Page Browse CCC CCP CSETS CTR IJRT Other Authors Search Purchase Guide FAQ Contact us	Civil-Comp Conferences ISSN 2753-3239 CCC: 1 PROCEEDINGS OF THE FIFTH INTERNATIONAL CONFERENCE ON RAILWAY TECHNOLOGY: RESEARCH, DEVELOPMENT AND MAINTENANCE Edited by: J. Pombo Paper 18.3 Parameter optimization with respect to elongated hillock regions beside the high-speed railway under crosswinds Z.-W. Chen^1,2 and Y.-Q. Ni^1,2 ¹National Rail Transit Electrification and Automation Engineering Technology Research Center (Hong Kong Branch), Hung Hom, Kowloon, Hong Kong SAR, China ²Department of Civil and Environmental Engineering, The Hong Kong Polytechnic University, Hung Hom, Kowloon, Hong Kong SAR, China doi:10.4203/ccc.1.18.3 Full Bibliographic Reference for this paper Z.-W. Chen, Y.-Q. Ni, "Parameter optimization with respect to elongated hillock regions beside the high-speed railway under crosswinds", in J. Pombo, (Editor), "Proceedings of the Fifth International Conference on Railway Technology: Research, Development and Maintenance", Civil-Comp Press, Edinburgh, UK, Online volume: CCC 1, Paper 18.3, 2022, doi:10.4203/ccc.1.18.3 Keywords: windbreak wall, crosswind, high-speed railway, NSGA-?. Abstract Complex terrains will result in elongated hillocks occurring near the windbreak wall along high-speed railways, furthermore, the hillock weakens the anti-wind ability of the windbreak wall. In this paper, characteristic parameters - the distance between hillock and windbreak wall (D) and the hillock height (H) are optimized by capitalizing on computational fluid dynamics (CFD) and multi-objective optimization method of the Non-dominated Sorting Genetic Algorithm II (NSGA-II). The surrogate model of Kriging model is advantaged and it is to be the final surrogate model to optimize the maximum wind speed Umax and peak-to-peak value Up-p for the railway concerned. The optimized results demonstrate that D = 25 – 35 m and H = 2 – 12 m can ensure that Umax < 0.5. Besides, it is shown that distance D plays a key role in reducing the sudden wind peak values. download the full-text of this paper (PDF, 6 pages, 455 Kb) go to the previous paper go to the next paper return to the table of contents return to the volume description
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