Rail Noise Sources
Imagine deliverable D12/13
For other downloadable documents see below
Description of the Work Package
For all environmental noise predictions the essential elements are the characterisation of the acoustic source and the propagation of sound energy from that source to the reception point. This work package is predominantly aimed at making railway source data available to noise mappers, especially those using harmonised methods emerging from the Harmonoise/Imagine process. The main sources to consider are rolling noise (wheel/rail interaction), traction noise (eg engines and fans), and aerodynamic noise. Related work in the Harmonoise project has laid the foundations for this, involving consideration of categorisation techniques for vehicles and methods for separating the contributions from wheels and track, as well as a proposed traction noise model. Within this work package a robust and user-friendly database structure will be created, allowing source data to be stored and readily retrieved. At the same time train noise data will be acquired at a range of locations within Europe and will be used to part-populate the database. The database will then remain open to allow continuous update as further information becomes available in the future. It will be important for the database to be flexible enough to store data with varying levels of precision, as it may not always be possible to acquire detailed information on every occasion for reasons of practicality and cost. The work package will also validate and improve, if necessary, the traction noise model proposed in Harmonoise.
Railway userinterface database
One part of workpackage 6, task 4 of the IMAGINE project is to create a database structure allowing source terms to be stored and efficiently accessed for general purposes, and to feed the HARMONOISE/IMAGINE prediction procedures for noise mapping.
The IMAGINE database is based on the databasestructure defined in the Harmonoise project. This report describes a possible userinterface on this database. The userinterface can be entered on three levels: level 0 (basic level), level 1 (advanced level) and level 2 (expert level).
Availability of Rail Noise Source data
The document 'Measured railway noise source data in the public domain or via the Imagine project' can be downloaded. It describes the availability of Rail Noise Source data and the importance of data for noise mapping in a wide range of situations in Europe.
Railway noise source model, default source data and measurement protocol
The document "Railway noise source model, default source data and measurement protocol" is now available for download.
The WP6 presentation at the Europe Workshop on Environmental Acoustics, Terassa at 21-22 October 2005 is downloadable here.
Workshop for potential end users of the Imagine Railway Noise deliverables
On 1 December 2005 Work Package 6 (railway noise) organised a workshop in Brussels. The purpose was to explain the input that will be necessary from the infrastructure owners and the traffic operators. Feedback from the workshop will be used to optimise the rail noise techniques that are being developed within the work package.
About 50 representatives from many different European countries were present, and took part in an active discussion. The presentations can be downloaded here: