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X. Liu, H. Jiang, Y. Chen, M. Gao, "Experimental Investigation of the Track Dynamic Performance for a Downslope Small-Radius Curve in a Metro", in J. Pombo, (Editor), "Proceedings of the Sixth International Conference on Railway Technology: Research, Development and Maintenance", Civil-Comp Press, Edinburgh, UK, Online volume: CCC 7, Paper 5.11, 2024, doi:10.4203/ccc.7.5.11

Keywords: rail corrugation, metro line, downslope small-radius curve, clip resonance fracture, vibration propagation, excitation frequency.

Abstract

This paper presents the investigation of the track dynamic performance in a typical downslope small-radius curve of a metro line. The rail corrugation and the dynamic performance of the track are analyzed based on the in-site measurement and compared with the upslope side. It has been found that the rail corrugations are mainly developed on the downslope side, and the inner rail has multiple wavelengths from 26 mm to 50 mm. Such a phenomenon is likely to be caused by the complex wheel-rail interaction in the downslope section, where the speed limit requires intermittent braking of the train. The knock-on effect of rail corrugation is rather serious. It not only increased vibration source intensity (on the tunnel wall) of up to 10 dB but also abrupt failure of clips due to resonance. This study has important guiding significance in the design and operation of the metro. Downslope small-radius curves should be avoided in the phase of design. For the existing lines, the speed control mechanism in downslope curves needs to be further optimized to guarantee the smoothness of trains passing through.

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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: 7 PROCEEDINGS OF THE SIXTH INTERNATIONAL CONFERENCE ON RAILWAY TECHNOLOGY: RESEARCH, DEVELOPMENT AND MAINTENANCE Edited by: J. Pombo Paper 5.11 Experimental Investigation of the Track Dynamic Performance for a Downslope Small-Radius Curve in a Metro X. Liu, H. Jiang, Y. Chen and M. Gao China Academy of Railway Sciences (Shenzhen) Research and Design Institute Co. Ltd., China Academy of Railway Sciences Corporation Limited, Beijing, China doi:10.4203/ccc.7.5.11 Full Bibliographic Reference for this paper X. Liu, H. Jiang, Y. Chen, M. Gao, "Experimental Investigation of the Track Dynamic Performance for a Downslope Small-Radius Curve in a Metro", in J. Pombo, (Editor), "Proceedings of the Sixth International Conference on Railway Technology: Research, Development and Maintenance", Civil-Comp Press, Edinburgh, UK, Online volume: CCC 7, Paper 5.11, 2024, doi:10.4203/ccc.7.5.11 Keywords: rail corrugation, metro line, downslope small-radius curve, clip resonance fracture, vibration propagation, excitation frequency. Abstract This paper presents the investigation of the track dynamic performance in a typical downslope small-radius curve of a metro line. The rail corrugation and the dynamic performance of the track are analyzed based on the in-site measurement and compared with the upslope side. It has been found that the rail corrugations are mainly developed on the downslope side, and the inner rail has multiple wavelengths from 26 mm to 50 mm. Such a phenomenon is likely to be caused by the complex wheel-rail interaction in the downslope section, where the speed limit requires intermittent braking of the train. The knock-on effect of rail corrugation is rather serious. It not only increased vibration source intensity (on the tunnel wall) of up to 10 dB but also abrupt failure of clips due to resonance. This study has important guiding significance in the design and operation of the metro. Downslope small-radius curves should be avoided in the phase of design. For the existing lines, the speed control mechanism in downslope curves needs to be further optimized to guarantee the smoothness of trains passing through. download the full-text of this paper (PDF, 12 pages, 1325 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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