Qualitative Comparison of the Characteristics of Articulated and Non-Articulated Trains and Their Effects on Impact

“…La unión entre cajas proporciona ventajas desde el punto de vista de un posible descarrilo, al proveer al tren de un sistema antiacaballamiento de forma natural [121]. Además, el tren es menos sensible al viento lateral.…”

Section: Ventajas De La Configuración Articuladaunclassified

Modelado y simulación del comportamiento dinámico a baja frecuencia de trenes articulados

Carballeira¹

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This Thesis focuses on the development of computational tools for the simulation of the low frequency dynamics of articulated trains. By using these tools, the aim is to reach relevant conclusions for the preliminary design of these trains, since some important problems such as ride safety, dynamic instability and partly comfort are determined by this frequency range. For these tools to be efficient, they should allow for a low time-cost for the modelling, the calculations and the postprocessing of the results.Nowadays, the increase in the rolling stock speed and the energy efficiency are critical factors in the design of new high speed trains. In this regards, articulated trains share some features which make them particularly suitable for high speed operation. However, it is difficult for the commercial tools available for railway vehicle simulation to suit the modelling of articulated trains. Therefore, from the railway industry point of view, it would be interesting to have simplified models which reproduce the main issues regarding the low frequency dynamics of these trains. These models should be able to give reliable results and an overview on the dynamic behavior of the trains in order to guide the decisions in their design.A new methodology for developing dynamic models of articulated trains in an efficient manner will be presented in this work. In order to do so, some simplifying hypotheses will be introduced and the use of natural coordinates will be proposed to describe the kinematics of the carbodies. This methodology will be applied to develop linear and non-linear models of Talgo trains in order to validate the hypotheses assumed. Finally, some simulations will be run to establish the accuracy of the models and to improve the knowledge on the dynamic behavior of these trains.

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The effect of composite materials interfacial discontinuities on the impact safety of future composite rail vehicles

Xue,

Robinson,

Zhang

2024

Engineering Reports

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In contrast to single‐phase materials the manufacturing process of composites creates multiscale interfaces among constituent materials and between laminar multilayers. Targeting the interfaces in these composite structures, this paper presents a perspective study on the impact safety of potential future composite rail vehicles. The aim is to conceptually explore the key role of interfacial discontinuities of composite material structures as they are a critical issue affecting the impact performance of future composite rail vehicles. Following a theoretical description, the issues are addressed in two parts. First, composite materials are characteristically analyzed from the perspective of their interfacial discontinuities within the materials and between the laminate multilayers to identify their influence. Second, the structural conditions required for crashworthiness are determined in relation to the dual requirements of global stability and local deformability for efficient energy absorption. The key findings are: (1) The interfacial discontinuities of the material phases and the designed structural assemblies need to be tailored for crashworthiness performance and (2) Global stability and locally deformability are the key dual requirements for the energy absorbing progressive deformations that are essential for application of composite for crashworthiness of rail vehicles. The research conceptually explores a key issue of the impact mechanics of composite structures from the perspective of impact safety of composite rail vehicles.

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Qualitative Comparison of the Characteristics of Articulated and Non-Articulated Trains and Their Effects on Impact

Cited by 12 publications

References 8 publications

Development issues for impact safety of rail vehicles: Robustness of crashworthy designs, effect of structural crashworthiness on passenger safety and behaviour characterisation of vehicle materials

Development issues for impact safety of rail vehicles: Robustness of crashworthy designs, effect of structural crashworthiness on passenger safety and behaviour characterisation of vehicle materials

Modelado y simulación del comportamiento dinámico a baja frecuencia de trenes articulados

The effect of composite materials interfacial discontinuities on the impact safety of future composite rail vehicles

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