Numerical analysis of railway ballast tamping using a DEM-MBD co-simulation framework

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dc.contributor.authorMalmsköld, Pontus
dc.contributor.departmentChalmers tekniska högskola / Institutionen för industri- och materialvetenskapsv
dc.contributor.departmentChalmers University of Technology / Department of Industrial and Materials Scienceen
dc.contributor.examinerLarsson, Fredrik
dc.contributor.supervisorQuist, Johannes
dc.contributor.supervisorUllrich, Anita
dc.date.accessioned2024-08-06T11:24:56Z
dc.date.available2024-08-06T11:24:56Z
dc.date.issued2024
dc.date.submitted
dc.description.abstractRailway ballast tamping is a process through which geometrical defects of railways are corrected by moving the sleepers to their correct positions and inserting vibrating tamping tines into the ballast bed. The tines compact the ballast underneath the sleeper, thus ensuring proper load transfer between the sleeper and the subballast. This thesis presents a DEM-MBD co-simulation framework to model the tamping procedure, and explores the differences between a conventional tamping machine, where the vibrations are generated through an eccentric shaft, and a novel fully hydraulic tamping machine, where the vibrations are generated through hydraulics. The ballast bed is modeled through the Discrete Element Method (DEM) solver Demify®, developed in-house at FCC, and the tamping machine is modeled through a Multibody Dynamic (MBD) package called Simscape Multibody found in Simulink. Furthermore, a parameter study of different tamping design parameters is performed. The fully hydraulic tamping model is validated against real-world data, showing that the model lies within the expected distribution of real-world tamping operations. The results of the simulations show that the fully hydraulic tamping model is able to compact the ballast bed to a higher degree while maintaining lower forces acting upon the ballast particles as compared to the conventional tamping model. The parameter study reveals that the vibrational amplitude significantly affects the results of the tamping process, both for the conventional and for the fully hydraulic tamping model. Different vibrational frequencies affect the fully hydraulic tamping model significantly, while it only has some minor effects on the conventional tamping model.
dc.identifier.coursecodeIMSX30
dc.identifier.urihttp://hdl.handle.net/20.500.12380/308340
dc.language.isoeng
dc.setspec.uppsokTechnology
dc.subjectRailway ballast tamping
dc.subjectDiscrete element method
dc.subjectMultibody dynamics
dc.subjectFully hydraulic tamping machine
dc.subjectDEM-MBD co-simulation
dc.subjectFunctional mockup interface
dc.titleNumerical analysis of railway ballast tamping using a DEM-MBD co-simulation framework
dc.type.degreeExamensarbete för masterexamensv
dc.type.degreeMaster's Thesisen
dc.type.uppsokH
local.programmeApplied mechanics (MPAME), MSc
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