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PROCEEDINGS OF THE SECOND INTERNATIONAL CONFERENCE ON RAILWAY TECHNOLOGY: RESEARCH, DEVELOPMENT AND MAINTENANCE
Edited by: J. Pombo
A Direct Method for Analysing the Nonlinear Vehicle-Structure Interaction in High-Speed Railway Lines
S.G.M. Neves, P.A. Montenegro, A.F.M. Azevedo and R. Calçada
Faculty of Engineering, University of Porto, Portugal
S.G.M. Neves, P.A. Montenegro, A.F.M. Azevedo, R. Calçada, "A Direct Method for Analysing the Nonlinear Vehicle-Structure Interaction in High-Speed Railway Lines", in J. Pombo, (Editor), "Proceedings of the Second International Conference on Railway Technology: Research, Development and Maintenance", Civil-Comp Press, Stirlingshire, UK, Paper 81, 2014. doi:10.4203/ccp.104.81
Keywords: vehicle-structure interaction, wheel-rail contact, high speed train.
An accurate, efficient and stable algorithm to analyse the nonlinear vertical vehicle-structure interaction is presented in this paper. The governing equilibrium equations of the vehicle and structure are complemented with additional constraint equations that relate the displacements of the vehicle with the corresponding displacements of the structure. These equations form a single system, with displacements and contact forces as unknowns, that are solved using an optimized block factorization algorithm. As a result of the nonlinear nature of contact, an incremental formulation based on the Newton method is adopted. The track and structure are modelled using finite elements to take into account all the significant deformations. In the numerical example presented, the passage of the KHST over a railway viaduct is analysed, being the accuracy and computational efficiency of the proposed method clearly demonstrated.
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