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Stichel, Sebastian, ProfessorORCID iD iconorcid.org/0000-0002-8237-5847
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Publications (10 of 164) Show all publications
Ruan, B., Zhang, L., Dou, W., Zhang, D. & Stichel, S. (2024). Experiments and design of a kirigami-based multi-stage energy absorption structure subjected to axial impact. Thin-walled structures, 200, Article ID 111920.
Open this publication in new window or tab >>Experiments and design of a kirigami-based multi-stage energy absorption structure subjected to axial impact
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2024 (English)In: Thin-walled structures, ISSN 0263-8231, E-ISSN 1879-3223, Vol. 200, article id 111920Article in journal (Refereed) Published
Abstract [en]

As a typical energy-absorbing structure, the thin-walled structure dissipates impact energy through the formation of plastic hinges and material failure. The geometric configuration of the energy-absorbing structure deeply influences its response to impact loads. For a certain load curve required by collision scenarios, this study proposes a novel design method for approximating a continuous impact load curve with discretized ones. Based on kirigami structures, the conceptual framework integrates multi-module and multi-stage designs to regulate segmental stiffness through theoretical analysis, thereby achieving the desired curve approximation. The effectiveness of the proposed kirigami-based multi-stage energy absorption structure (KMS) is validated by drop-weight impact tests and numerical simulations. Findings demonstrate that the KMS effectively dissipates impact energy in a progressive manner, aligning with the desired load curve and inducing stable and orderly structural deformation under axial impact. Through appropriate parameter design, the deformation mode and the inducing effect of the kirigami structure can be managed, enabling the structure's adaptability to diverse collision scenarios.

Place, publisher, year, edition, pages
Elsevier BV, 2024
Keywords
Drop-weight impact tests, Energy absorption, Kirigami structure, Multi-stage, Numerical simulation
National Category
Applied Mechanics
Identifiers
urn:nbn:se:kth:diva-346156 (URN)10.1016/j.tws.2024.111920 (DOI)2-s2.0-85191166516 (Scopus ID)
Note

QC 20240506

Available from: 2024-05-03 Created: 2024-05-03 Last updated: 2024-05-06Bibliographically approved
Wu, Q., Bernal, E., Spiryagin, M., Krishna, V. V., Ding, H., Stichel, S. & Cole, C. (2024). Heavy haul rail/wheel wear and RCF assessments using 3D train models and a new wear map. Wear, 538-539, Article ID 205226.
Open this publication in new window or tab >>Heavy haul rail/wheel wear and RCF assessments using 3D train models and a new wear map
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2024 (English)In: Wear, ISSN 0043-1648, E-ISSN 1873-2577, Vol. 538-539, article id 205226Article in journal (Refereed) Published
Abstract [en]

Wear and Rolling Contact Fatigue (RCF) on wheels and rails are influenced by relative motions between the studied rail and wheel pair, and therefore influenced by train dynamics. Wear and RCF assessments using a train dynamics approach provide more accurate and comprehensive results comparing with conventional assessments that often do not consider train dynamics. In addition, considering material property differences, currently available rail wear maps are not able to accurately describe the wear performance of materials that have significantly different properties. This paper presented a method for rail/wheel wear and RCF assessments using 3D train dynamics models. The use of train models allows the consideration of coupler forces, traction, and brakes during the assessment. Wear assessments were conducted by using an in-house rail wear map model developed from the twin disc wear machine at the Centre for Railway Engineering (CRE). The new rail wear map was developed by using the AS 60 rail material (hardness 340 HB). The results indicated that the methods proposed in this paper could be used for rail/wheel wear and RCF assessments. Traction/braking forces and coupler lateral forces had evident influences on wear and RCF assessment. Different wear maps were also shown to have significant influences on the wear rate results.

Place, publisher, year, edition, pages
Elsevier BV, 2024
Keywords
Parallel computing, Rail material, RCF, Train dynamics, Wear, Wear map, Wheel-rail contact
National Category
Tribology (Interacting Surfaces including Friction, Lubrication and Wear) Vehicle Engineering
Identifiers
urn:nbn:se:kth:diva-342192 (URN)10.1016/j.wear.2023.205226 (DOI)001149546700001 ()2-s2.0-85181069821 (Scopus ID)
Note

QC 20240115

Available from: 2024-01-15 Created: 2024-01-15 Last updated: 2024-02-13Bibliographically approved
Persson, R., Stichel, S., Liu, Z. & Giossi, R. L. (2023). Cost reduction with single axle running gears in metro trains. In: 2022 Conference Proceedings Transport Research Arena, TRA Lisbon 2022: . Paper presented at 2022 Conference Proceedings Transport Research Arena, TRA Lisbon 2022, Lisboa, Portugal, Nov 14 2022 - Nov 17 2022 (pp. 876-883). Elsevier B.V.
Open this publication in new window or tab >>Cost reduction with single axle running gears in metro trains
2023 (English)In: 2022 Conference Proceedings Transport Research Arena, TRA Lisbon 2022, Elsevier B.V. , 2023, p. 876-883Conference paper, Published paper (Refereed)
Abstract [en]

Energy and maintenance costs constitute a large part of the recurring cost for railway operation. The vehicle weight impacts both energy consumption and the need for tamping of the track, while curving performance impacts the curving resistance and the wear on wheels and rails. In the project RUN2Rail and further in NextGear, both parts of the EU-funded initiative Shift2Rail, a single axle running gear with composite frame and active wheelset guidance was proposed for metro vehicles. The present study is comparing a reference vehicle from Metro Madrid with the proposed vehicle in terms of energy consumption and maintenance cost for simulated service on Metro Madrid Line 10 with curvature, gradients, stops and speed profiles considered. The calculated yearly saving for each vehicle become about 50 k€/(year*trainset), split on 20% on energy and 40% on each of wheel and track maintenance.

Place, publisher, year, edition, pages
Elsevier B.V., 2023
Keywords
Active suspension, Energy consumption, Reinforced plastic, Two-axle vehicle, Weight reduction, Wheel wear
National Category
Vehicle Engineering
Identifiers
urn:nbn:se:kth:diva-342801 (URN)10.1016/j.trpro.2023.11.495 (DOI)2-s2.0-85182935313 (Scopus ID)
Conference
2022 Conference Proceedings Transport Research Arena, TRA Lisbon 2022, Lisboa, Portugal, Nov 14 2022 - Nov 17 2022
Note

QC 20240202

Available from: 2024-01-31 Created: 2024-01-31 Last updated: 2024-02-02Bibliographically approved
Tardivo, A., Pfeifer, A., Hoang, A., Zanuy, A. C., Schick, B., Schindler, C., . . . Stichel, S. (2023). Effectiveness of EU-funded R&I programmes from the perspective of the European railway sector stakeholders. In: 2022 Conference Proceedings Transport Research Arena, TRA Lisbon 2022: . Paper presented at 2022 Conference Proceedings Transport Research Arena, TRA Lisbon 2022, Lisboa, Portugal, Nov 14 2022 - Nov 17 2022 (pp. 1256-1263). Elsevier B.V.
Open this publication in new window or tab >>Effectiveness of EU-funded R&I programmes from the perspective of the European railway sector stakeholders
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2023 (English)In: 2022 Conference Proceedings Transport Research Arena, TRA Lisbon 2022, Elsevier B.V. , 2023, p. 1256-1263Conference paper, Published paper (Refereed)
Abstract [en]

The paper provides a methodology for measuring the adherence of Research & Innovation (R&I) actions in railways to the stakeholders' requirements and expected benefits. After collecting the stakeholders' requirements, the R&I objectives are extracted from high-level documents such as Europe's Rail Joint Undertaking Master Plan and Multi Annual Work Programme. Lastly, after standardization of the requirements and the technology concepts, a top-down analysis is performed. The results show that network management and vehicle technologies have the highest benefit for the stakeholders, and ERRAC and Regulatory Bodies' requirements are well addrebed. However, the end-users requirements are only partially fulfilled. The necessity of increasing multimodal transport and cooperation with other transport modes is shown, while stronger focus can be placed on the employees and education/training.

Place, publisher, year, edition, pages
Elsevier B.V., 2023
Keywords
benefits, EU-funded R&I programmes, R&I impacts, Stakeholder analysis, Stakeholders requirements, Top-down analysis
National Category
Transport Systems and Logistics Reliability and Maintenance
Identifiers
urn:nbn:se:kth:diva-342811 (URN)10.1016/j.trpro.2023.11.585 (DOI)2-s2.0-85182934063 (Scopus ID)
Conference
2022 Conference Proceedings Transport Research Arena, TRA Lisbon 2022, Lisboa, Portugal, Nov 14 2022 - Nov 17 2022
Note

QC 20240201

Available from: 2024-01-31 Created: 2024-01-31 Last updated: 2024-02-01Bibliographically approved
Hossein Nia, S., Krishna, V. V., Odolinski, K., Torstensson, P. T., Ait-Ali, A., Sundholm, L., . . . Stichel, S. (2023). Simulation-based evaluation of maintenance strategies from a life cycle cost perspective. Wear, 532-533, Article ID 205120.
Open this publication in new window or tab >>Simulation-based evaluation of maintenance strategies from a life cycle cost perspective
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2023 (English)In: Wear, ISSN 0043-1648, E-ISSN 1873-2577, Vol. 532-533, article id 205120Article in journal (Refereed) Published
Abstract [en]

A methodology that combines simulations of long-term mechanical degradation including maintenance interventions with an assessment of the associated socio-economic impact is proposed. This development responds to an urgent need within the railway sector to enable the evaluation of maintenance strategies from a LCC perspective. The functionality of the methodology is demonstrated in an investigation of rail grinding strategies for a curve on the Swedish Iron-ore line. The results indicate a reduction in LCC of 50% when using a harder rail material (R400HT) combined with annual rail grinding as compared to a softer rail material (R350LHT) and two grinding campaigns per year.

Place, publisher, year, edition, pages
Elsevier BV, 2023
Keywords
Life cycle cost, Rail grinding, Rolling contact fatigue (RCF), Simulation of long-term mechanical degradation, Wear
National Category
Vehicle Engineering
Identifiers
urn:nbn:se:kth:diva-337431 (URN)10.1016/j.wear.2023.205120 (DOI)2-s2.0-85171678905 (Scopus ID)
Note

QC 20231003

Available from: 2023-10-03 Created: 2023-10-03 Last updated: 2023-10-03Bibliographically approved
Zhang, Y., Liu, Z. & Stichel, S. (2023). Study on the braking distance of composite brake blocks covered with ice for freight trains in winter. Proceedings of the Institution of mechanical engineers. Part F, journal of rail and rapid transit, 237(8), 1050-1059
Open this publication in new window or tab >>Study on the braking distance of composite brake blocks covered with ice for freight trains in winter
2023 (English)In: Proceedings of the Institution of mechanical engineers. Part F, journal of rail and rapid transit, ISSN 0954-4097, E-ISSN 2041-3017, Vol. 237, no 8, p. 1050-1059Article in journal (Refereed) Published
Abstract [en]

In winter, some freight trains with composite brake blocks experience unexpected long braking distances, which seriously jeopardizes running safety. The reasons for the long braking distances are still not completely understood, and therefore it is difficult to suggest preventive measures. Up to now, it has not really been studied how a layer of ice that is often found between the brake block and the wheel influences the braking process. To investigate whether ice influences the braking distance, a numerical model is built. Ice thickness, ambient temperature, initial speed, and axle load/brake pressure are parameters that can be varied in the model. Results are checked against available on-track tests. The simulation results show that ice significantly influences the braking distance. The impact of ice on the braking distance increases when the ambient temperature, initial speed, and brake pressure are low, which is consistent with available field test reports. The results also show that a conditioning brake, a high brake pressure and a small clearance between the wheel and brake block can efficiently reduce the impact of ice on the braking distance of freight trains with composite brake blocks in winter.

Place, publisher, year, edition, pages
SAGE Publications, 2023
Keywords
braking distance, composite brake block, Freight train, ice, winter
National Category
Vehicle Engineering
Identifiers
urn:nbn:se:kth:diva-338418 (URN)10.1177/09544097231151474 (DOI)000913437000001 ()2-s2.0-85146537403 (Scopus ID)
Note

QC 20231023

Available from: 2023-10-23 Created: 2023-10-23 Last updated: 2023-10-23Bibliographically approved
Dou, W., Guo, S., Zhang, L., Zhu, Y. & Stichel, S. (2022). A feature points-based method for data transfer in fluid-structure interactions. International Journal of Mechanical Sciences, 234, Article ID 107696.
Open this publication in new window or tab >>A feature points-based method for data transfer in fluid-structure interactions
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2022 (English)In: International Journal of Mechanical Sciences, ISSN 0020-7403, E-ISSN 1879-2162, Vol. 234, article id 107696Article in journal (Refereed) Published
Abstract [en]

For numerical simulations of fluid-structure interaction (FSI) problems, discretized meshes of different compu-tational domains do not have to match at the common interface. Data transfer via the interface is therefore significantly affecting the accuracy of FSI. Implementing data transfer between such pairwise non-matching meshes is challenging, as it is highly desirable to yield numerical accuracy using methods such as interpola-tion or projection. To further improve the data transfer accuracy for mesh-based approaches, this study proposes a feature points-based combined interpolation method by means of Simpson's rule, with which an appropriate weighting coefficient is determined. Moreover, radial basis function (RBF) is employed to perform the inter-polation of scattered data points. The proposed method is validated by a series of examples involving various non-matching mesh configurations in FSI problems. The numerical findings indicate that this method can further improve data transfer accuracy. Even for a critical case with large mesh ratio at the interface it can provide satisfying results.

Place, publisher, year, edition, pages
Elsevier BV, 2022
Keywords
Fluid-structure interaction (FSI), Simpson?s rule, Feature points-based combined interpolation, Data transfer, Non-matching meshes
National Category
Computational Mathematics Computer Vision and Robotics (Autonomous Systems) Fusion, Plasma and Space Physics
Identifiers
urn:nbn:se:kth:diva-319536 (URN)10.1016/j.ijmecsci.2022.107696 (DOI)000857201600005 ()2-s2.0-85137033145 (Scopus ID)
Note

QC 20221005

Available from: 2022-10-05 Created: 2022-10-05 Last updated: 2022-10-05Bibliographically approved
Mandal, N. K., Spiryagin, M., Wu, Q., Wen, Z. & Stichel, S. (2022). FEA of mechanical behaviour of insulated rail joints due to vertical cyclic wheel loadings. Engineering Failure Analysis, 133, 105966, Article ID 105966.
Open this publication in new window or tab >>FEA of mechanical behaviour of insulated rail joints due to vertical cyclic wheel loadings
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2022 (English)In: Engineering Failure Analysis, ISSN 1350-6307, E-ISSN 1873-1961, Vol. 133, p. 105966-, article id 105966Article in journal (Refereed) Published
Abstract [en]

Insulated rail joints (IRJs), safety critical components of railway track, are used to locate trains and broken rails using electrical signalling systems. The bending rigidity of the rail at an IRJ is only 2/3(rds) as that of continuous rail. As a result, stress singularity problems occur at IRJs which therefore degrade faster compared to the continuous rail. Both railhead top surface and subsurface damage occurs and accelerates the initiation of cracks. Head hardened rails are used to overcome these problems. A thorough study addresses the damage pattern in the railhead sub-surface using a 3D finite element analysis (FEA) employing vertical wheel loadings considering three endpost materials: fibre glass (fb), nylon 66 (ny) and polytetrafluoroethylene (ptfe). A new damage parameter, the vertical residual stress component, is proposed to assess new patterns of railhead damage considering plastic deformation. To rank the influential stress related damage parameters, two other parameters are also considered, namely residual von-Mises and longitudinal stress components. Of these, the residual von-Mises stress component is more prominent with regard to the top surface and sub-surface damage, whereas the longitudinal stress component is responsible for top surface material damage. From these damage patterns, a progressive change in the hardness distribution of railhead material can evolve.

Place, publisher, year, edition, pages
Elsevier BV, 2022
Keywords
Rail joints, Endpost, FEA, Sub-surface damage, Cyclic ratchetting, Elastoplastic material behaviour, Hardness
National Category
Applied Mechanics
Identifiers
urn:nbn:se:kth:diva-309427 (URN)10.1016/j.engfailanal.2021.105966 (DOI)000753161900001 ()2-s2.0-85121570013 (Scopus ID)
Note

QC 20220307

Available from: 2022-03-07 Created: 2022-03-07 Last updated: 2022-06-25Bibliographically approved
Bernal, E., Spiryagin, M., Stichel, S., Bosso, N., Lewis, R., Bosomworth, C., . . . Cole, C. (2022). Friction-Slip Curves - The Pathway From Twin-Disc Tribo Measurements To Full-Scale Locomotive Multibody Simulations. In: PROCEEDINGS OF 2022 JOINT RAIL CONFERENCE (JRC2022): . Paper presented at Joint Rail Conference (JRC) on Kicking Off the Next 100 Years of Rail Innovation, APR 20-21, 2022, ELECTR NETWORK. AMER SOC MECHANICAL ENGINEERS, Article ID V001T07A005.
Open this publication in new window or tab >>Friction-Slip Curves - The Pathway From Twin-Disc Tribo Measurements To Full-Scale Locomotive Multibody Simulations
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2022 (English)In: PROCEEDINGS OF 2022 JOINT RAIL CONFERENCE (JRC2022), AMER SOC MECHANICAL ENGINEERS , 2022, article id V001T07A005Conference paper, Published paper (Refereed)
Abstract [en]

Locomotive multibody simulations are commonly used as a cost-effective tool to study, energy efficiency, wheel-rail wear, rolling contact fatigue, etc. The accuracy of the wheel-rail contact forces from multibody simulations depends on the correct modelling of the friction conditions. The friction coefficient is a function of the slip velocity, and it is influenced by several tribological parameters including, for example, material mechanical properties, environmental conditions and the presence of third body layers that vary spatially and temporally along the track. In most cases, generic friction-slip curves obtained from publications and public reports are used as inputs to the wheel-rail contact model in the locomotive simulations, as direct friction measurements using full-scale experimental set-ups are generally cost-prohibitive. A pathway to produce friction-slip curves from tribo-machine friction measurements is proposed in this paper. The pathway involves manufacturing discs from actual wheel and rail material samples to measure the traction coefficient at a spectrum of slip set points using a twin-disc tribo-machine. The tribo-machine results are scaled to be used in a locomotive multibody model that uses the modified Fastsim and a traction system co-simulation approach. Two friction curves for wet and dry conditions are processed and exemplified in a dynamic model.

Place, publisher, year, edition, pages
AMER SOC MECHANICAL ENGINEERS, 2022
Keywords
Friction, slip, tribo-machine, scale experiment, locomotive, traction, multibody model, numerical analysis, modified Fastsim
National Category
Vehicle Engineering
Identifiers
urn:nbn:se:kth:diva-325256 (URN)10.1115/JRC2022-84111 (DOI)000949318600029 ()2-s2.0-85134306256 (Scopus ID)
Conference
Joint Rail Conference (JRC) on Kicking Off the Next 100 Years of Rail Innovation, APR 20-21, 2022, ELECTR NETWORK
Note

QC 20230404

Available from: 2023-04-04 Created: 2023-04-04 Last updated: 2023-06-08Bibliographically approved
Krishna, V. V., Wu, Q., Hossein Nia, S., Spiryagin, M. & Stichel, S. (2022). Long freight trains & Long-term rail surface damage: Towards digital twins that enable predictive maintenance of track. In: Proceedings of the 13th World Congress on Railway Research (WCRR2022): . Paper presented at World Congress on Railway Research (WCRR2022). Birmingham, UK
Open this publication in new window or tab >>Long freight trains & Long-term rail surface damage: Towards digital twins that enable predictive maintenance of track
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2022 (English)In: Proceedings of the 13th World Congress on Railway Research (WCRR2022), Birmingham, UK, 2022Conference paper, Published paper (Refereed)
Abstract [en]

In this work, the authors present a detailed ’train-track’ interaction model of a long freight train operation topredict long-term rail surface damage. In addition to vehicles and track, intermediate maintenance actions inthe form of cyclic grinding passes have also been modelled according to EN standards to effectively representthe evolving wheel-rail interface. The influence of longitudinal train dynamics in the form of traction, braking,gradients, etc are also accounted in the method to reflect their effect on damage evolution. The two-stepmethodology consists of modules each modelling longitudinal train dynamics and long-term rail surface damagerespectively. The multi-disciplinary integrated numerical framework comprising of train, real operational casesand track attributes has been built based on principles of vehicle dynamics, tribology, and fatigue analysis. Themodel has been demonstrated for a heavy haul freight train operation on a 120 km long track section in thenorth of Sweden for which the results have been presented. Also, additional scenarios that can be expected ina real time operation with varying traction/braking, gradients etc have been considered. In the end, thisintegrated numerical framework comprising of 4 T’s namely train, track, tractive strategies, and trackmaintenance can be tuned into a digital twin to guide infrastructure managers regarding the condition of railassets as a function of tonnage passage. This can in turn facilitate predictive maintenance of track depending ontraffic and operation.

Place, publisher, year, edition, pages
Birmingham, UK: , 2022
National Category
Mechanical Engineering Vehicle Engineering
Research subject
Järnvägsgruppen - Fordonsteknik; Järnvägsgruppen - Effektiva tågsystem för godstrafik; Vehicle and Maritime Engineering
Identifiers
urn:nbn:se:kth:diva-314798 (URN)
Conference
World Congress on Railway Research (WCRR2022)
Funder
EU, Horizon 2020, 101004051
Note

QC 20220627

Available from: 2022-06-23 Created: 2022-06-23 Last updated: 2022-06-27Bibliographically approved
Organisations
Identifiers
ORCID iD: ORCID iD iconorcid.org/0000-0002-8237-5847

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