On the generation of enhanced lookup tables for wheel-rail contact models
Autor(a) principal: | |
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Data de Publicação: | 2019 |
Outros Autores: | , , , , , , |
Tipo de documento: | Artigo |
Idioma: | eng |
Título da fonte: | Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) |
Texto Completo: | http://hdl.handle.net/10400.21/10480 |
Resumo: | In railway dynamics, the interpolation of lookup tables (LUTs) is a procedure utilized to reduce the computational effort when computing the wheel-rail contact forces. However, the generation of LUTs with multiple inputs and multiple outputs is a challenging task for which aspects such as their minimal size and uniform accuracy over the LUT domain have not been systematically addressed in the literature. Thus, this work presents a comprehensive methodology for a detailed analysis of general LUTs, and identifies ways to improve them. For that, an analysis of the variation of the input parameters is made and the interpolation error is assessed on the cells and edges of the original table, then, based on this analysis, two enhanced LUTs are proposed. The first one is approximately 5 times smaller than the original but holds similar accuracy. The second table exhibits half of the maximum interpolation error of the original LUT but holds an identical size. The methodology is demonstrated here using the recently published Kalker Book of Tables for Non-Hertzian contact (KBTNH) but it can be used by any other LUT approach in order to improve accuracy and/or to reduce size. |
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On the generation of enhanced lookup tables for wheel-rail contact modelsWheel-rail contactLookup tablesAccuracyEfficiencyNon-hertzian contactIn railway dynamics, the interpolation of lookup tables (LUTs) is a procedure utilized to reduce the computational effort when computing the wheel-rail contact forces. However, the generation of LUTs with multiple inputs and multiple outputs is a challenging task for which aspects such as their minimal size and uniform accuracy over the LUT domain have not been systematically addressed in the literature. Thus, this work presents a comprehensive methodology for a detailed analysis of general LUTs, and identifies ways to improve them. For that, an analysis of the variation of the input parameters is made and the interpolation error is assessed on the cells and edges of the original table, then, based on this analysis, two enhanced LUTs are proposed. The first one is approximately 5 times smaller than the original but holds similar accuracy. The second table exhibits half of the maximum interpolation error of the original LUT but holds an identical size. The methodology is demonstrated here using the recently published Kalker Book of Tables for Non-Hertzian contact (KBTNH) but it can be used by any other LUT approach in order to improve accuracy and/or to reduce size.ElsevierRCIPLMarques, FilipeMagalhães, HugoLiu, BinbinPombo, JoãoFlores, PauloAmbrosio, JorgePiotrowski, JerzyBruni, Stefano2019-09-09T08:39:14Z2019-09-152019-09-15T00:00:00Zinfo:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/articleapplication/pdfhttp://hdl.handle.net/10400.21/10480engMARQUES, Filipe; [et al] – On the generation of enhanced lookup tables for wheel-rail contact models. Wear. ISSN 0043-1648. Vols. 434-435 (2019), pp. 1-130043-1648https://doi.org/10.1016/j.wear.2019.202993metadata only accessinfo:eu-repo/semantics/openAccessreponame:Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos)instname:Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informaçãoinstacron:RCAAP2023-08-03T10:00:31Zoai:repositorio.ipl.pt:10400.21/10480Portal AgregadorONGhttps://www.rcaap.pt/oai/openaireopendoar:71602024-03-19T20:18:53.696898Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) - Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informaçãofalse |
dc.title.none.fl_str_mv |
On the generation of enhanced lookup tables for wheel-rail contact models |
title |
On the generation of enhanced lookup tables for wheel-rail contact models |
spellingShingle |
On the generation of enhanced lookup tables for wheel-rail contact models Marques, Filipe Wheel-rail contact Lookup tables Accuracy Efficiency Non-hertzian contact |
title_short |
On the generation of enhanced lookup tables for wheel-rail contact models |
title_full |
On the generation of enhanced lookup tables for wheel-rail contact models |
title_fullStr |
On the generation of enhanced lookup tables for wheel-rail contact models |
title_full_unstemmed |
On the generation of enhanced lookup tables for wheel-rail contact models |
title_sort |
On the generation of enhanced lookup tables for wheel-rail contact models |
author |
Marques, Filipe |
author_facet |
Marques, Filipe Magalhães, Hugo Liu, Binbin Pombo, João Flores, Paulo Ambrosio, Jorge Piotrowski, Jerzy Bruni, Stefano |
author_role |
author |
author2 |
Magalhães, Hugo Liu, Binbin Pombo, João Flores, Paulo Ambrosio, Jorge Piotrowski, Jerzy Bruni, Stefano |
author2_role |
author author author author author author author |
dc.contributor.none.fl_str_mv |
RCIPL |
dc.contributor.author.fl_str_mv |
Marques, Filipe Magalhães, Hugo Liu, Binbin Pombo, João Flores, Paulo Ambrosio, Jorge Piotrowski, Jerzy Bruni, Stefano |
dc.subject.por.fl_str_mv |
Wheel-rail contact Lookup tables Accuracy Efficiency Non-hertzian contact |
topic |
Wheel-rail contact Lookup tables Accuracy Efficiency Non-hertzian contact |
description |
In railway dynamics, the interpolation of lookup tables (LUTs) is a procedure utilized to reduce the computational effort when computing the wheel-rail contact forces. However, the generation of LUTs with multiple inputs and multiple outputs is a challenging task for which aspects such as their minimal size and uniform accuracy over the LUT domain have not been systematically addressed in the literature. Thus, this work presents a comprehensive methodology for a detailed analysis of general LUTs, and identifies ways to improve them. For that, an analysis of the variation of the input parameters is made and the interpolation error is assessed on the cells and edges of the original table, then, based on this analysis, two enhanced LUTs are proposed. The first one is approximately 5 times smaller than the original but holds similar accuracy. The second table exhibits half of the maximum interpolation error of the original LUT but holds an identical size. The methodology is demonstrated here using the recently published Kalker Book of Tables for Non-Hertzian contact (KBTNH) but it can be used by any other LUT approach in order to improve accuracy and/or to reduce size. |
publishDate |
2019 |
dc.date.none.fl_str_mv |
2019-09-09T08:39:14Z 2019-09-15 2019-09-15T00:00:00Z |
dc.type.status.fl_str_mv |
info:eu-repo/semantics/publishedVersion |
dc.type.driver.fl_str_mv |
info:eu-repo/semantics/article |
format |
article |
status_str |
publishedVersion |
dc.identifier.uri.fl_str_mv |
http://hdl.handle.net/10400.21/10480 |
url |
http://hdl.handle.net/10400.21/10480 |
dc.language.iso.fl_str_mv |
eng |
language |
eng |
dc.relation.none.fl_str_mv |
MARQUES, Filipe; [et al] – On the generation of enhanced lookup tables for wheel-rail contact models. Wear. ISSN 0043-1648. Vols. 434-435 (2019), pp. 1-13 0043-1648 https://doi.org/10.1016/j.wear.2019.202993 |
dc.rights.driver.fl_str_mv |
metadata only access info:eu-repo/semantics/openAccess |
rights_invalid_str_mv |
metadata only access |
eu_rights_str_mv |
openAccess |
dc.format.none.fl_str_mv |
application/pdf |
dc.publisher.none.fl_str_mv |
Elsevier |
publisher.none.fl_str_mv |
Elsevier |
dc.source.none.fl_str_mv |
reponame:Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) instname:Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informação instacron:RCAAP |
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Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informação |
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RCAAP |
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RCAAP |
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Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) |
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Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) |
repository.name.fl_str_mv |
Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) - Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informação |
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1799133454317649920 |