Project Approach

Concept

For the on-board monitoring of the TDR and rail roughness using sound pressure measurements, new procedures will be developed for the evaluation of an average wheel roughness and for the evaluation of the temperature dependence of the TDR. These procedures will provide more reliable input data for the simulation tools.

The existing wheel-rail noise calculation models will be enhanced by a better description of the wheel-rail contact behaviour, which is influenced by the rail wear and by the position of the contact points (also in curves). A procedure for the low frequency noise calculation will be proposed.

Quiet-Track will develop strategies for optimal acoustic grinding and rail wear correction. Grinding strategies and maintenance strategies exist for rail defect removal by grinding and for track tamping but not for dedicated acoustic grinding and dedicated acoustical rail wear correction. To reach this objective, the relationship between rail wear types and noise emission will be established and a rail roughness growth model will be selected and updated.

Quiet-Track will combine existing solutions for a better global performance, especially for situations where this potential is available such as concrete slab tracks where it is possible to deal independently with measures at the rail (e.g. damping) and at the track surface (e.g. absorption).

Quiet-Track will focus on new and innovative solutions, which target the most noise sensitive parameters such as rail roughness and rail roughness growth.

A procedure will be established for the selection of track components (rail type and hardness) which yields optimal rolling noise behaviour resulting from an acoustically positive wear pattern, taking into account the types of rolling stock in the network and the track topology (tangent and straight).

Noise management tools will be developed to be able to measure correctly the performance of a noise mitigating measure and to select optimally the type of track mitigation measure for use in e.g. actions plans requested by the END in cities (where the use of non-track based measures is often prohibited or not feasible).

Activities to address according to call

WP

Public deliverable

1

Monitoring of rail roughness, track dynamic properties and average wheel roughness

Objectives are:

  • to develop a measurement system for monitoring the track roughness mounted on a dedicated instrumented C20 vehicle in the network of partner SLL;
  • to develop a measurement system for monitoring the track decay rates (TDR);
  • to determine a procedure for determination of TDR’s for embedded tracks;
  • to develop and recommend a procedure for the average wheel roughness determination.

2

Rolling contact model enhancement in the existing rolling noise models

Objectives are:

  • to develop required enhancements and additions to the existing models enabling a better understanding of the track contribution to the rolling noise.

3

Concepts and tools for noise related track maintenance

Objectives are:

  • to develop concepts for acoustic rail grinding starting from rail roughness growth models, which are to be tuned by measured rail roughness growth;
  • to develop concepts for rail profile correction by identifying wear related noise in curves;
  • to develop a noise related track maintenance tool.

4

Development and validation of high performance solutions for reduction of track related noise

Objectives are:

  • to develop and validate a methodology for combining existing noise mitigation solutions for high performance;
  • to develop innovative track solutions, based upon the concept of rail roughness growth rate reduction;
  • to develop a low noise embedded track system;
  • to recommend a rail type and hardness for low noise emission.
5

Development of noise management tools

Objectives are:

  • to develop a procedure for performance measurement of mitigation measures and noise management tools for track maintenance activities and for noise mitigating solutions.

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