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Train pass-by noise source characterization and separation tools for cost-effective vehicle certification


"Results from field measurements as well as numerical computations of sound transmission (""Green´s functions, noise transfer functions"") for air-borne sound for some typical installations."

For the equivalent monopole method the transmission is exactly described by a so called Greens function ie a measurement or simulation of the frequency response between a monopole source strength and acoustic pressure at a receiving point Field measurements will be performed of Greens functions for a few selected cases on rail vehicles standstill conditions and used to validate the numerical models provided by ISVRVTC

Validation of acoustic performance of new design variants

Document with the comparison between experimental and simulations results for the selected design including an assessment of their potential for future development and recommendations on the steps to take towards application in railway vehicles This will include an assessment of the potential for dBA and weight reductionThis document report will also report on experimental activities planned in Task 42

Track versus vehicle separation and transposition techniques including theoretical description and proposal for full scale validation test campaign

Enhancements and simplifications to each proposed method will be developed in this task to improve their accuracy while reducing cost and increasing practicality Key requirements are the ability to provide an accurate estimation of the contribution of the vertical and lateral rail vibration the sleeper vibration and the wheel vibration in onethird octave bands as well as overall dBA level

Validated procedure for source characterization based on equivalent monopoles and tests involving generic sources.

Validated procedure for source characterization based on equivalent monopoles and tests involving generic sources.Specification of information required to define source strengths and directivity for implementation in the global noise modelling tool.

Acoustic performance characterization of baseline and new design variants

Document with the simulation results for the acoustic performance characterization of the baseline situation and the new designs

Project Quality Plan

Document with a set of project templates, explanations on the project management process, review process, quality checks, meeting organisation, which is communicated to all partners

State of the art, strategy for enhancing separation techniques.

In Roll2Rail a number of techniques were developed by the current partners for separating track and wheel noise components and these were evaluated in a field test. Based on the proposed requirements, strategies for enhancing each separation method will be defined by each partner. Hybrid methods combining more than one approach will also be considered.

Equivalent monopole source data for at least two selected sources.

The equivalent monopole method and the 3D imaging technique IBF described in T11 will be applied on a selected set at least two of real sources eg a traction motor a HVAC fan unit and a transformer The final selection should be decided by the complementary project S2RCFMCCA012019

Report with final analysis of pass-by source separation results and uncertainty analysis; Innovative separation techniques: validation test results

Results from the measurement campaigns in Task 23 as well as the outcome from tests of the methods in Task 22 will be considered to validate and to assess the methods This will also include final assessment of uncertainties

Report on State of the art, strategy and requirements for new separation techniques

A number of methods for source separation were already applied in the past and have delivered results of different quality. The development of new techniques which present improvements and benefits in comparison to these techniques needs to be based on a detailed review of the state of the art.

Innovative separation techniques: theoretical description and validation testing campaign proposal.

Methods that are identified to be feasible in Task 21 will be adapted and improved Where necessary additional software implementation and tests are carried out

Feasibility study of new concepts and approaches

Document with the results of the feasibility study, including a brief description of all approaches, designs and methods considered with an assessment of strengths and weaknesses and a final recommendation for the two preferred approaches.

Measurement plan

Document with a complete preliminary description of the measurement campaigns (for WP1, WP2 and WP3), including locations, vehicles, (target) schedule and a detailed description of the measurements and associated requirements.

Data Management Plan

Document describing procedure to ensure the proper management of all data produced by and used by the partners. Final version.

Documented measurement plan and database of raw and processed data

Measurement campaigns will be planned and performed in cooperation with the complementary project S2RCFMCCA012019 seeking efficiencies by data sharing between partners and WPs and preselected methods

Track versus vehicle separation and transposition techniques conclusions, recommendations and validation test results

Field measurements will be carried out to test and validate the proposed separation procedures The complementary project S2RCFMCCA012019 will define and give access to vehicles and tracks to be used for this purpose it is expected that this will take into account the requirements defined in D32

Estimation of uncertainties in the global noise modelling tool.

The results from Tasks 1113 will be implemented in the global modelling tool developed by ISVR in Acoutrain 15 and used to estimate uncertainties


Erweiterung der CLEANT-Methode zur Entfaltung bei Mikrofonarray-Messungen an Hochgeschwindigkeitszugen

Autorzy: Mikolaj Czuchaj, Adam Kujawski, Ennes Sarradj
Opublikowane w: JAHRESTAGUNG FÜR AKUSTIK, 2021, Page(s) 789-791, ISBN 978-3-939296-18-8

Quantitative Charakterisierung von Schallquellen mit Mikrofonarrays bei der Vorbeifahrt von Zügen

Autorzy: Mikolaj Czuchaj, Simon Jekosch, Adam Kujawski, Ennes Sarradj
Opublikowane w: Jahrestagung für Akustik, 2023, Page(s) 365-368, ISBN 978-3-939296-21-8
Wydawca: Jahrestagung für Akustik

Improved methods for the separation of track and wheel noise components during a train pass-by

Autorzy: Thompson, David, Zhao, Dong, Cierco, Ester, Jansen, Erwin and Dittrich, Michael
Opublikowane w: 14th International Workshop on Railway Noise, 2022
Wydawca: 14th International Workshop on Railway Noise

A Trainable Iterative Soft Thresholding Algorithm for Microphone Array Source Mapping

Autorzy: Can Kayser, Adam Kujawski and Ennes Sarradj
Opublikowane w: Berlin Beamforming Conference, 2022, Page(s) 8-9
Wydawca: Berlin Beamforming Conference

The influence of the vehicle body on the sound radiation from the rail

Autorzy: Zhao, Dong, Thompson, David, Ntotsios, Evangelos, Cierco, Ester and Jansen, Erwin
Opublikowane w: 14th International Workshop on Railway Noise, Shanghai, China, 2022
Wydawca: University of Southampton Institutional Repository

Effect of slit length on linear and non-linear acoustic transfer impedance of a micro-slit plate

Autorzy: Alessia Aulitto, Avraham Hirschberg, Ines Lopez Arteaga and Esmée L.R.H. Buijssen
Opublikowane w: Acta Acustica, 2021, ISSN 2681-4617
Wydawca: edp sciences
DOI: 10.1051/aacus/2021059

Material Selection Process for Acoustic and Vibration Applications Using the Example of a Plate Resonator

Autorzy: Neubauer, M.; Schwaericke, F.; Radmann, V.; Sarradj, E.; Modler, N.; Dannemann, M.
Opublikowane w: Materials, 2022, ISSN 1996-1944
Wydawca: MDPI Open Access Publishing
DOI: 10.3390/ma15082935

Fast grid-free strength mapping of multiple sound sources from microphone array data using a Transformer architecture

Autorzy: Adam Kujawski; Ennes Sarradj
Opublikowane w: The Journal of the Acoustical Society of America, 2022, Page(s) 2543–2556, ISSN 0001-4966
Wydawca: Acoustical Society of America
DOI: 10.1121/10.0015005

Frequency stop-band optimization in micro-slit resonant metamaterials

Autorzy: Jan de Priester, Alessia Aulitto, Ines Lopez Arteaga
Opublikowane w: Applied Acoustics, 2022, ISSN 0003-682X
Wydawca: Pergamon Press Ltd.
DOI: 10.1016/j.apacoust.2021.108552

Influence of geometry on acoustic end-corrections of slits in microslit absorbers

Autorzy: Alessia Aulitto; Avraham Hirschberg; Ines Lopez Arteaga
Opublikowane w: The Journal of the Acoustical Society of America, 2021, Page(s) 3073–3085, ISSN 0001-4966
Wydawca: Acoustical Society of America
DOI: 10.1121/10.0004826

Single Source Dataset

Autorzy: Mikolaj Czuchaj
Opublikowane w: Zenodo, 2023
Wydawca: Zenodo
DOI: 10.5281/zenodo.7801605

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