Sökning: "Järnvägsgruppen - Fordonsteknik"

Visar resultat 1 - 5 av 9 avhandlingar innehållade orden Järnvägsgruppen - Fordonsteknik.

1. 1. Correlation between Track Irregularities and Vehicle Dynamic Response Based on Measurements and Simulations

   Författare :Tomas Karis; Mats Berg; Jens Nielsen; KTH; []
   Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; track irregularities; vehicle response; wheel–rail force; axle box acceleration; Dynotrain; Gröna Tåget; multi-body system; simulations; spårlägesfel; fordonsrespons; hjul–räl-krafter; axelboxacceleration; Dynotrain; Gröna Tåget; flerkroppssystem system; simuleringar; Järnvägsgruppen - Fordonsteknik; Järnvägsgruppen - Fordonsteknik; Vehicle and Maritime Engineering; Farkostteknik; Järnvägsgruppen - Infrastruktur; Järnvägsgruppen - Infrastruktur;

   Sammanfattning : Deviations from the design track geometry are called track irregularities, which are a main excitation mechanism in the track–vehicle dynamic system, and very important to monitor and maintain to have trac on a line run safely and comfortably. Especially during vehicle acceptance testing, it is important that a new vehicle behaves close to design predictions and within limit values, thus it is important to be able to describe track irregularities in a consistent way. LÄS MER

3. 2. On Efficient Modelling of Wheel-Rail Contact in Vehicle Dynamics Simulation

   Författare :Matin Shahzamanian Sichani; Mats Berg; Roger Enblom; Asier Alonso; KTH; []
   Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; wheel-rail contact; non-elliptic contact; rail vehicle dynamics; rolling contact; vehicle-track interaction; wheel-rail damage; Järnvägsgruppen - Fordonsteknik; Järnvägsgruppen - Fordonsteknik; Järnvägsgruppen - Tribologi; The KTH Railway Group - Tribology; Vehicle and Maritime Engineering; Farkostteknik;

   Sammanfattning : The wheel-rail contact is at the core of all research related to vehicletrackinteraction. This tiny interface governs the dynamic performanceof rail vehicles through the forces it transmits and, like any high stressconcentration zone, it is subjected to serious damage phenomena. LÄS MER

4. 3. Wheel-rail contact modelling in vehicle dynamics simulation

   Författare :Matin Shahzamanian Sichani; Mats Berg; Roger Enblom; Elena Kabo; KTH; []
   Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; wheel-rail contact; non-elliptic contact; vehicle-track interaction; rail vehicle dynamics; rolling contact; MBS; virtual penetration; Järnvägsgruppen - Fordonsteknik; Järnvägsgruppen - Fordonsteknik; Järnvägsgruppen - Tribologi; The KTH Railway Group - Tribology;

   Sammanfattning : The wheel-rail contact is at the core of all research related to vehicle-track interaction. This tiny interface governs the dynamic performance of rail vehicles through the loads it transmits and, like any high stress concentration zone, it is subjected to serious damage phenomena. LÄS MER

5. 4. On Active Secondary Suspension in Rail Vehicles to Improve Ride Comfort

   Författare :Anneli Orvnäs; Sebastian Stichel; Rickard Persson; Roger Goodall; KTH; []
   Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; rail vehicle; active secondary suspension; ride comfort; sky-hook damping; H∞ control; multi-body simulations; on-track tests; Järnvägsgruppen - Gröna tåget; Järnvägsgruppen - Gröna tåget; Järnvägsgruppen - Fordonsteknik; Järnvägsgruppen - Fordonsteknik;

   Sammanfattning : One way to make rail vehicles a competitive means of transportation is to increase running speed. However, higher speeds usually generate increased forces and accelerations on the vehicle, which have a negative effect on ride comfort. With conventional passive suspension, it may be difficult to maintain acceptable passenger comfort. LÄS MER

7. 5. Análisis dinámico de un eje de ferrocarril con capacidad de cambio de ancho automático

   Författare :Carlos Casanueva; José Germán Giménez; Asier Alonso; Javier Gil Sevillano; Jordi Vinolas; Jesús M. Busturia; Xabier Pérez; Eduardo Gómez; University of Navarra CEIT and Tecnun; []
   Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; variable gauge wheelset; railway dynamics; ; eje de ancho variable; dinámica ferroviaria; Järnvägsgruppen - Fordonsteknik; Järnvägsgruppen - Fordonsteknik;

   Sammanfattning : El objetivo de la presente tesis es la mejora de los actuales ejes de ancho variable para su circulación por vías de alta velocidad (AV) a velocidades de hasta 300km/h. En la actualidad los vehículos con ejes de ancho variable no sobrepasan los 250km/h de velocidad de servicio en vías de AV, lo que supone un claro desaprovechamiento de recursos y dificultades de gestión del tráfico para el gestor de la infraestructura a causa de las distintas velocidades punta de los diferentes trenes. LÄS MER