Impact of rail infrastructure maintenance conditions on the vehicle-track interaction loads

Abstract

The rail infrastructure and the track components are expensive assets with long life spans and high maintenance costs. The cost efficiency, performance and punctuality of train operations heavily depend on the track conditions. Ideally, the railway track would be completely smooth providing continuous support to the rolling stock running on it. In practice, however, the infrastructure cannot be installed without irregularities. These defects will increase over time due to the service loads imposed by the railway vehicles. The aim of this work is to use advanced computational tools to predict how the vehicles will respond to changing levels of track defects. For this purpose, the track and its maintenance conditions are characterized in realistic operation scenarios and modelled with detail in order to enable studying the interaction loads that are imposed to the vehicles by the track conditions. The presented methodology enables to identify the track health indexes that have higher influence on the dynamic loads transmitted to the rolling stock. It was observed that the track layout, track irregularities and degradation of the rails have the larger influence on the vehicle-track interaction loads with consequences in terms of safety and maintenance costs. In this way, this work contributes to the development of solutions with technological relevance, giving answer to the industry’s most recent needs in terms of reducing the maintenance costs and decreasing the incidents that cause traffic disruptions, contributing to improve the competitiveness of the railway transport.

Parametric analysis of railway infrastructure for improved performance and lower life-cycle costs using machine learning techniques

“…Other authors have proposed co-simulation methodologies using Finite Element Method (FEM) and multibody formulations in order to study the flexibility of track structures under realistic trainset loads [31][32][33][34]. These developments open up the possibility of integrating more detailed wheel-rail contact models [35][36][37][38][39][40][41][42][43][44], to consider track irregularities [45,46] and other track singularities [10,[47][48][49][50] in the studies aiming to assess track performance and degradation evolution [51][52][53][54][55] under realistic operation conditions.…”

Three-dimensional modelling of slab-track systems based on dynamic experimental tests

“…Other authors have proposed co-simulation methodologies between MB and FE formulations in order to study the track structure under realistic trainset loads [31][32][33][34]. These developments open the possibility of integrating complex track geometries [35][36][37], more detailed wheel-rail contact models [38][39][40][41][42][43][44][45][46], to consider track irregularities [47,48] and other track singularities [49][50][51] in the studies aiming to assess the track performance and degradation evolution [52][53][54][55][56][57] in realistic operation conditions.…”

A finite element methodology to model flexible tracks with arbitrary geometry for railway dynamics applications

“…Although several methodologies are available to represent these subsystems in vehicle-track interaction problems, the multibody dynamic analysis and the finite element method became the most used approaches. Studies concerning the vehicle subsystem favor a multibody dynamics approach and focus on describing the mechanical components of the vehicle and their interactions [7][8][9][10][11][12][13]. On the other hand, studies concerning the track subsystem tend to favor the finite element method and focus on describing the structural and material behavior of the track and its components [14][15][16][17][18][19][20][21][22].…”