Validated multibody model for train crash analysis

作者：João Milho, Jorge Ambrósio, Manuel Pereira · 发表于：International Journal of Crashworthiness · 年份：2003 · DOI：10.1533/ijcr.2003.0242 · 被引用次数：43 · 研究领域：Dynamics and Control of Mechanical Systems、Transportation Safety and Impact Analysis、Railway Engineering and Dynamics

The development of numerical simulation tools for train crashworthiness design requires their validation with reference crash scenarios similar, in nature, to the eventual collision conditions in which the new train designs have to be used. The modeling assumptions and the suitability of these tools can be verified using data feedback from experimental testing. In this work, a validated multibody-based model is presented for the design of train crashworthy components. In the proposed methodology, the moving components of a vehicle are described as sets of rigid bodies, with their relative motion constrained by kinematic joints. Rigid bodies connected by nonlinear force elements, which represent the lumped flexibility of the structural components, model the sub-structures that deform as a result of the train collisions. The characteristics of these nonlinear force elements represent the force-deformation curves of individual car-bodies extremities, couplers between car-bodies and stiffness of the suspensions springs. The wheel-rail contact is also represented by a model in which the normal and friction forces are present. The friction forces are described by Coulomb friction, which includes their dependency on static and dynamic friction coefficients. The contact forces between the end extremities of the colliding car-bodies, that model the longitudinal impact, include the action of anti-climber devices, which are designed to prevent sliding between the contacting buffers. The...