{"id":75570,"date":"2005-08-07T00:00:00","date_gmt":"2005-08-07T00:00:00","guid":{"rendered":"https:\/\/www.deberes.net\/tesis\/sin-categoria\/nuevos-desarrollos-para-la-resolucion-del-problema-de-contacto-rueda-carril-y-su-aplicacion-a-simulaciones-dinamicas\/"},"modified":"2005-08-07T00:00:00","modified_gmt":"2005-08-07T00:00:00","slug":"nuevos-desarrollos-para-la-resolucion-del-problema-de-contacto-rueda-carril-y-su-aplicacion-a-simulaciones-dinamicas","status":"publish","type":"post","link":"https:\/\/www.deberes.net\/tesis\/ingenieria-y-tecnologia-mecanicas\/nuevos-desarrollos-para-la-resolucion-del-problema-de-contacto-rueda-carril-y-su-aplicacion-a-simulaciones-dinamicas\/","title":{"rendered":"Nuevos desarrollos para la resoluci\u00f3n del problema de contacto rueda-carril y su aplicaci\u00f3n a simulaciones din\u00e1micas"},"content":{"rendered":"<h2>Tesis doctoral de <strong> Asier Alonso Pazos <\/strong><\/h2>\n<p>Titul0: nuevos desarrollos para la resoluci\u00f3n del problema de contacto rueda-carril y su aplicaci\u00f3n a simulaciones din\u00e1micas resumen: el objetivo global de esta tesis es profundizar en el conocimiento de los diferentes fen\u00f3menos que intervienen en el problema del contacto rueda-carril con el fin de desarrollar algoritmos de c\u00e1lculo que eliminen las principales limitaciones observadas en los m\u00e9todos actuales. De esta manera se pretende reducir las incertidumbres y errores cometidos durante el proceso de dise\u00f1o de los veh\u00edculos ferroviarios as\u00ed como permitir el estudio con profundidad de problemas de dif\u00edcil soluci\u00f3n como puede ser, por ejemplo, el an\u00e1lisis de desgastes en cruzamientos. Es necesario a\u00f1adir que a los m\u00e9todos desarrollados a lo largo de esta tesis doctoral se les ha exigido un coste computacional suficientemente bajo como para poder ser utilizados en programas de simulaci\u00f3n ferroviaria sin ral entizar en exceso las simulaciones. En lo referente al problema normal, se ha desarrollado un nuevo m\u00e9todo denominado m\u00e9todo \u00abs.R.S.T.\u00bb Que permite resolver el problema teniendo en cuenta la forma real de los cuerpos en contacto; esto es, sin asimilar la forma de estos a paraboloides tal y como hace la teor\u00eda de hertz. Adem\u00e1s, se ha extendido el m\u00e9todo \u00abs.R.S.T.\u00bb Para permitir la resoluci\u00f3n del contacto multipunto as\u00ed como la uni\u00f3n de dos \u00e1reas de contacto en una \u00fanica zona. En lo referente al problema tangencial de contacto se ha realizado un estudio comparativo entre las diferentes teor\u00edas m\u00e1s utilizadas en el campo ferroviario. En este estudio se ha concluido que el algoritmo fastsim es el m\u00e9todo m\u00e1s adecuado para ser implementado en un simulador din\u00e1mico ya que combina una adecuada precisi\u00f3n con un coste computacional relativamente bajo. Una vez realizado el estudio anterior se ha procedido a mejorar el algoritmo fastsim. Los objetivos perseguidos durante las mejoras han sido dos. Por un lado se ha pretendido reducir al m\u00ednimo el coste computacional del algoritmo. En este campo se ha desarrollado la formulaci\u00f3n necesaria para calcular anal\u00edticamente las tensiones transmitidas a trav\u00e9s de la zona de adhesi\u00f3n y se ha cambiado el m\u00e9todo de integraci\u00f3n para calcular las tensiones tangenciales en la zona de deslizamiento.Por otro lado, se han incluido posibilidades inicialmente no tenidas en cuenta en el algoritmo original. En esta \u00e1rea se ha trabajado en la resoluci\u00f3n de \u00e1reas de contacto no el\u00edpticas, en la introducci\u00f3n en el algoritmo de un coeficiente de fricci\u00f3n variable con el deslizamiento y en el c\u00e1lculo del momento de pivotamiento. The main objective of this work is to deepen in the knowledge of the different phenomena that take part in the wheel-rail contact problem in order to develop calculation algorithms that eliminate the main limitations observed in the actual methods. In this manner, it is foreseen to reduce the uncertainties and errors committed during the design stage of a railway vehicle as well as to allow the study of different problems of difficult solution as, for example, the wear analysis on crossings. An additional condition that has been imposed to the method developed throughout this doctoral thesis is a low enough computational cost in order to prevent the simulation slowing down to unacceptable levels. Concerning the normal problem, a new method (the \u00abs.R.S.T.\u00bb Method) has been developed in order to take into account the real shape of the bodies in contact; that is, without assimilating the shape of this bodies to paraboloids (as hertz theory does). Moreover, the \u00abs.R.S.T.\u00bb Method has been extended in order to allow the solving of the multicontact problem and the union of two contact areas. Concerning the tangential problem a comparative analysis between the different theories has been performed. In this study it has been established that the fastsim algorithm is the most suitable method to be implemented in a railway simulator program, as it combines good accuracy with a relatively low computational cost once the aforementioned study has been performed, some modifications have been done in order to improve the characteristics of the fastsim algorithms: reducing the computational cost, solving non-elliptical contact areas, introducing a falling friction coefficient and calculating the yawing moment<\/p>\n<p>&nbsp;<\/p>\n<h3>Datos acad\u00e9micos de la tesis doctoral \u00ab<strong>Nuevos desarrollos para la resoluci\u00f3n del problema de contacto rueda-carril y su aplicaci\u00f3n a simulaciones din\u00e1micas<\/strong>\u00ab<\/h3>\n<ul>\n<li><strong>T\u00edtulo de la tesis:<\/strong>\u00a0 Nuevos desarrollos para la resoluci\u00f3n del problema de contacto rueda-carril y su aplicaci\u00f3n a simulaciones din\u00e1micas <\/li>\n<li><strong>Autor:<\/strong>\u00a0 Asier Alonso Pazos <\/li>\n<li><strong>Universidad:<\/strong>\u00a0 Navarra<\/li>\n<li><strong>Fecha de lectura de la tesis:<\/strong>\u00a0 08\/07\/2005<\/li>\n<\/ul>\n<p>&nbsp;<\/p>\n<h3>Direcci\u00f3n y tribunal<\/h3>\n<ul>\n<li><strong>Director de la tesis<\/strong>\n<ul>\n<li>Jos\u00e9 German Gimenez Ortiz<\/li>\n<\/ul>\n<\/li>\n<li><strong>Tribunal<\/strong>\n<ul>\n<li>Presidente del tribunal: Carlos Bastero de eleizalde <\/li>\n<li>Javier Garcia de jalon y de la fuente (vocal)<\/li>\n<li>Carlos Vera \u00e1lvarez (vocal)<\/li>\n<li>ernesto Garcia vadillo (vocal)<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n<p>&nbsp;<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Tesis doctoral de Asier Alonso Pazos Titul0: nuevos desarrollos para la resoluci\u00f3n del problema de contacto rueda-carril y su aplicaci\u00f3n [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"site-sidebar-layout":"default","site-content-layout":"","ast-site-content-layout":"","site-content-style":"default","site-sidebar-style":"default","ast-global-header-display":"","ast-banner-title-visibility":"","ast-main-header-display":"","ast-hfb-above-header-display":"","ast-hfb-below-header-display":"","ast-hfb-mobile-header-display":"","site-post-title":"","ast-breadcrumbs-content":"","ast-featured-img":"","footer-sml-layout":"","theme-transparent-header-meta":"","adv-header-id-meta":"","stick-header-meta":"","header-above-stick-meta":"","header-main-stick-meta":"","header-below-stick-meta":"","astra-migrate-meta-layouts":"default","ast-page-background-enabled":"default","ast-page-background-meta":{"desktop":{"background-color":"var(--ast-global-color-4)","background-image":"","background-repeat":"repeat","background-position":"center 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