Model Updating of a Freight Wagon Based on Dynamic Tests under Different Loading Scenarios

This article presents an efficient methodology for the calibration of a numerical model of a <i>Sgnss</i> freight railway wagon based on experimental modal parameters, namely natural frequencies and mode shapes. Dynamic tests were performed for two distinct static loading configurations,...

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Autores principales:	Rúben Silva, Diogo Ribeiro, Cássio Bragança, Cristina Costa, António Arêde, Rui Calçada
Formato:	article
Lenguaje:	EN
Publicado:	MDPI AG 2021
Materias:	freight wagon FE model dynamic tests model updating genetic algorithm Technology T Engineering (General). Civil engineering (General) TA1-2040 Biology (General) QH301-705.5 Physics QC1-999 Chemistry QD1-999
Acceso en línea:	https://doaj.org/article/2da5a98227bf46a4a53d6ff212072129
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spelling	oai:doaj.org-article:2da5a98227bf46a4a53d6ff2120721292021-11-25T16:35:21ZModel Updating of a Freight Wagon Based on Dynamic Tests under Different Loading Scenarios10.3390/app1122106912076-3417https://doaj.org/article/2da5a98227bf46a4a53d6ff2120721292021-11-01T00:00:00Zhttps://www.mdpi.com/2076-3417/11/22/10691https://doaj.org/toc/2076-3417This article presents an efficient methodology for the calibration of a numerical model of a <i>Sgnss</i> freight railway wagon based on experimental modal parameters, namely natural frequencies and mode shapes. Dynamic tests were performed for two distinct static loading configurations, tare weight and current operational overload, under demanding test conditions, particularly during an unloading operation of the train and without disturbing its tight operational schedule. These conditions impose restrictions to the tests, especially regarding the test duration, sensor positioning and system excitation. The experimental setups involve the use of several high-sensitivity accelerometers strategically distributed along with the vehicle platform and bogies in the vertical direction. The modal identification was performed with the application of the enhanced frequency-domain decomposition (EFDD) method, allowing the estimation of 10 natural frequencies and mode shapes associated with structural movements of the wagon platform, which in some cases are coupled with rigid body movements. A detailed 3D FE model of the freight wagon was developed including the platform, bogies, wheelsets, primary suspensions and wheel–rail interface. The model calibration was performed sequentially, first with the unloaded wagon model and then with the loaded wagon model, resorting to an iterative method based on a genetic algorithm. The calibration process allowed the obtainment of the optimal values of eight numerical parameters, including a double estimation of the vertical stiffness of the primary suspensions under the unloaded and loaded static configurations. The results demonstrate that the primary suspensions present an elastic/almost elastic behaviour. The comparison of experimental and numerical responses before and after calibration revealed significant improvements in the numerical models and a very good correlation between the experimental and numerical responses after calibration.Rúben SilvaDiogo RibeiroCássio BragançaCristina CostaAntónio ArêdeRui CalçadaMDPI AGarticlefreight wagonFE modeldynamic testsmodel updatinggenetic algorithmTechnologyTEngineering (General). Civil engineering (General)TA1-2040Biology (General)QH301-705.5PhysicsQC1-999ChemistryQD1-999ENApplied Sciences, Vol 11, Iss 10691, p 10691 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	freight wagon FE model dynamic tests model updating genetic algorithm Technology T Engineering (General). Civil engineering (General) TA1-2040 Biology (General) QH301-705.5 Physics QC1-999 Chemistry QD1-999
spellingShingle	freight wagon FE model dynamic tests model updating genetic algorithm Technology T Engineering (General). Civil engineering (General) TA1-2040 Biology (General) QH301-705.5 Physics QC1-999 Chemistry QD1-999 Rúben Silva Diogo Ribeiro Cássio Bragança Cristina Costa António Arêde Rui Calçada Model Updating of a Freight Wagon Based on Dynamic Tests under Different Loading Scenarios
description	This article presents an efficient methodology for the calibration of a numerical model of a <i>Sgnss</i> freight railway wagon based on experimental modal parameters, namely natural frequencies and mode shapes. Dynamic tests were performed for two distinct static loading configurations, tare weight and current operational overload, under demanding test conditions, particularly during an unloading operation of the train and without disturbing its tight operational schedule. These conditions impose restrictions to the tests, especially regarding the test duration, sensor positioning and system excitation. The experimental setups involve the use of several high-sensitivity accelerometers strategically distributed along with the vehicle platform and bogies in the vertical direction. The modal identification was performed with the application of the enhanced frequency-domain decomposition (EFDD) method, allowing the estimation of 10 natural frequencies and mode shapes associated with structural movements of the wagon platform, which in some cases are coupled with rigid body movements. A detailed 3D FE model of the freight wagon was developed including the platform, bogies, wheelsets, primary suspensions and wheel–rail interface. The model calibration was performed sequentially, first with the unloaded wagon model and then with the loaded wagon model, resorting to an iterative method based on a genetic algorithm. The calibration process allowed the obtainment of the optimal values of eight numerical parameters, including a double estimation of the vertical stiffness of the primary suspensions under the unloaded and loaded static configurations. The results demonstrate that the primary suspensions present an elastic/almost elastic behaviour. The comparison of experimental and numerical responses before and after calibration revealed significant improvements in the numerical models and a very good correlation between the experimental and numerical responses after calibration.
format	article
author	Rúben Silva Diogo Ribeiro Cássio Bragança Cristina Costa António Arêde Rui Calçada
author_facet	Rúben Silva Diogo Ribeiro Cássio Bragança Cristina Costa António Arêde Rui Calçada
author_sort	Rúben Silva
title	Model Updating of a Freight Wagon Based on Dynamic Tests under Different Loading Scenarios
title_short	Model Updating of a Freight Wagon Based on Dynamic Tests under Different Loading Scenarios
title_full	Model Updating of a Freight Wagon Based on Dynamic Tests under Different Loading Scenarios
title_fullStr	Model Updating of a Freight Wagon Based on Dynamic Tests under Different Loading Scenarios
title_full_unstemmed	Model Updating of a Freight Wagon Based on Dynamic Tests under Different Loading Scenarios
title_sort	model updating of a freight wagon based on dynamic tests under different loading scenarios
publisher	MDPI AG
publishDate	2021
url	https://doaj.org/article/2da5a98227bf46a4a53d6ff212072129
work_keys_str_mv	AT rubensilva modelupdatingofafreightwagonbasedondynamictestsunderdifferentloadingscenarios AT diogoribeiro modelupdatingofafreightwagonbasedondynamictestsunderdifferentloadingscenarios AT cassiobraganca modelupdatingofafreightwagonbasedondynamictestsunderdifferentloadingscenarios AT cristinacosta modelupdatingofafreightwagonbasedondynamictestsunderdifferentloadingscenarios AT antonioarede modelupdatingofafreightwagonbasedondynamictestsunderdifferentloadingscenarios AT ruicalcada modelupdatingofafreightwagonbasedondynamictestsunderdifferentloadingscenarios
_version_	1718413067407065088

Model Updating of a Freight Wagon Based on Dynamic Tests under Different Loading Scenarios

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