Models for Calculating the Dynamic Performance of the Railway (MCD)

Lecturer

Zuzana Dimitrovová

Invited speakers for specific lectures

Objectives

• Provide trainees with knowledge about possible models of the railway.
• Provide trainees with the ability to choose the appropriate model for the objective in question.

Requirements on previous knowledge

• Basic notions of continuum mechanics, structural dynamics, finite element method, general programming concepts.

Program

• Simplified models (reduced): types of simplifications, the most widely used models, their advantages and limitations, their usefulness and feasibility, determination of their parameters.
• Methods of solution to obtain dynamic response of the simplified model subject to moving forces: analytical and semi-analytical methods.
• Moving forces: Steady-state response, critical velocity, receptance.
• The effect of cancellation and resonance.
• Inertia effects on moving object, support structure and foundation, moving object instability.
• Complete 3D finite element models, viscoelastic boundaries, creation of models in commercial software ANSYS and LS DYNA, APDL programming language.
• Uncertainties in input data, statistical analysis, numerical calibration, metaheuristic optimization.

Recommended literature

• Parts of syllabus of MMC e RM/LEG (Z. Dimitrovová, 2019)
• K.L. Knothe and S.L. Grassie, “Modelling of railway track and vehicle-track interaction at high frequencies,” Vehicle System Dynamics, vol. 22, pp. 209-262, 1993.
• Z. Dimitrovová, “Semi-analytical approaches to vibrations induced by moving loads with the focus on the critical velocity and instability of the moving system”, Chapter 4, pp. 97-152, em Ground Vibration from High Speed Railways, V.V. Krylov (Ed), ICE Publishing, Thomas Telford Ltd. ISBN: 9780727763792, https://doi.org/10.1680/gvfhsr.63792.097
• Syllabus of MCD (Z. Dimitrovová, 2020)
• A.F.S Rodrigues, Viability and applicability of simplified models for dynamic analysis of railway tracks, Ph.D. thesis. NOVA School of Science and Technology, NOVA University of Lisbon, Portugal, (2017).

Assessment

Practical test (30%), Report (individual) or program in APDL (groups of 2) and its presentation (70%).

Study language

English