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C. Suque Endlich¹, M. Valente Lopes¹, P. Augusto De Paula Pacheco^1,2 and A. Antunes Dos Santos¹

¹School of Mechanical Engineering, State University of Campinas, Brazil
²Railway Department, Federal Institute of Education Science and Technology of the Southeast of Minas Gerais, Brazil

doi:10.4203/ccc.7.5.5

C. Suque Endlich, M. Valente Lopes, P. Augusto De Paula Pacheco, A. Antunes Dos Santos, "Optimization of Primary Suspension of Freight Wagons to Improve Wheel Wear and Rolling Contact Fatigue", 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 5.5, 2024, doi:10.4203/ccc.7.5.5

Keywords: railway vehicle dynamics, wheel-rail interaction, multibody simulation, wear index, hunting stability, life extension.

Abstract

From freight rail speed and load increasing, wheel wear becomes increasingly significant. One of the approaches to reduce wheel wear is using a rubber pad adapter between the wheelset bearing and the side frame pedestal, as a part of the primary suspension. In this paper, a method is proposed to optimize the pad proprieties: stiffness and clearance. A heavy-haul wagon multibody vehicle dynamic model is established in SIMPACK, and the non-dominated sorting genetic algorithm-II (NSGA-II) is used to optimise the pad proprieties. The objective is to minimize the wear and the fatigue index while fulfilling objective restrictions. The analysis focuses on the sharp curve, 281.66 m radius, representative of a heavy haul Brazilian railway. The study resulted in two optimum pad designs, which prevented the wheel flange from contacting the rail during the curve. The solution can improve wear and fatigue indices up to 97.52% and 54.62%, based on the results. The optimal wear performance was achieved when longitudinal stiffness decreased by 68.14%, coupled with a 215.62% increase in longitudinal clearance. Additionally, lateral stiffness and clearance exhibited increases of 21.92% and 497.14%, respectively. Furthermore, there was a significant reduction in vertical (90%) and yaw (46.33%) stiffness.

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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 5.5 Optimization of Primary Suspension of Freight Wagons to Improve Wheel Wear and Rolling Contact Fatigue C. Suque Endlich¹, M. Valente Lopes¹, P. Augusto De Paula Pacheco^1,2 and A. Antunes Dos Santos¹ ¹School of Mechanical Engineering, State University of Campinas, Brazil ²Railway Department, Federal Institute of Education Science and Technology of the Southeast of Minas Gerais, Brazil doi:10.4203/ccc.7.5.5 Full Bibliographic Reference for this paper C. Suque Endlich, M. Valente Lopes, P. Augusto De Paula Pacheco, A. Antunes Dos Santos, "Optimization of Primary Suspension of Freight Wagons to Improve Wheel Wear and Rolling Contact Fatigue", 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 5.5, 2024, doi:10.4203/ccc.7.5.5 Keywords: railway vehicle dynamics, wheel-rail interaction, multibody simulation, wear index, hunting stability, life extension. Abstract From freight rail speed and load increasing, wheel wear becomes increasingly significant. One of the approaches to reduce wheel wear is using a rubber pad adapter between the wheelset bearing and the side frame pedestal, as a part of the primary suspension. In this paper, a method is proposed to optimize the pad proprieties: stiffness and clearance. A heavy-haul wagon multibody vehicle dynamic model is established in SIMPACK, and the non-dominated sorting genetic algorithm-II (NSGA-II) is used to optimise the pad proprieties. The objective is to minimize the wear and the fatigue index while fulfilling objective restrictions. The analysis focuses on the sharp curve, 281.66 m radius, representative of a heavy haul Brazilian railway. The study resulted in two optimum pad designs, which prevented the wheel flange from contacting the rail during the curve. The solution can improve wear and fatigue indices up to 97.52% and 54.62%, based on the results. The optimal wear performance was achieved when longitudinal stiffness decreased by 68.14%, coupled with a 215.62% increase in longitudinal clearance. Additionally, lateral stiffness and clearance exhibited increases of 21.92% and 497.14%, respectively. Furthermore, there was a significant reduction in vertical (90%) and yaw (46.33%) stiffness. download the full-text of this paper (PDF, 1687 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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