On the generation of enhanced lookup tables for wheel-rail contact models

Detalhes bibliográficos
Autor(a) principal: Marques, Filipe
Data de Publicação: 2019
Outros Autores: Magalhães, Hugo, Liu, Binbin, Pombo, João, Flores, Paulo, Ambrosio, Jorge, Piotrowski, Jerzy, Bruni, Stefano
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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spelling 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
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rights_invalid_str_mv metadata only access
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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)
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