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Monday, July 8 • 11:40 - 12:00
AN INNOVATIVE NUMERICAL APPROACH FOR TRAIN PASS-BY NOISE FORECASTING

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Reducing noise from rail freight has been identified by the European rail sector itself as a key objective. The regulations by the European Union - Physical Directive 2003/10 (Block, 2005) were adopted and the main implication of these regulations is to reduce the noise level in the cabin of the train by 5 dB and the noise for the average train speed of 160 km/h would be about 4 dB lower. Railway operational noise originates from several sources, such as: rolling (wheel-rail interaction), traction (locomotive engine, fans and gears), aerodynamic effects (pantograph, body turbulence) and so on. The dominant contributor, over the widest speed range (from around 50km/h to around 180km/h) is wheel-rail rolling noise, engine and powertrain noise. In order to reduce the different noise sources and study the noise propagation around the trains, the manufacturing companies and their suppliers have to come up with innovative solutions to predict the emitted noise level. The train pass-by-noise regulation aims to characterize the overall acoustic signature of a vehicle and it requires experimental measurement in its operational condition – as it passes over stationary microphones. In the development process of new and innovative trains, the pass-by-noise tests are the last step in the standardization process. Non-compliance or critical issues could be arise so new methods and numerical models must investigate solutions to control the acoustic propagation around the vehicle arises. This paper deals with an engineering method for predicting a vehicle pass-by noise based on a FEM/ BEM exterior acoustic calculation in the frequency domain. The researchers simulate, in a virtual environment, the experimental outdoor pass-by noise measurement. The simulated pass-by noise campaign is synthesized from multiple acoustic transfer functions between a line of virtual microphones located 7.5m on the side of the vehicle and each noise source. A numerical FEM/BEM train bogie acoustic model is created within the MSC ACTRAN and Coustyx commercial software. Wheel-rail rolling noise, engine and powertrain noise acoustic source are implemented and positioned inside the FEM and BEM model to demonstrate the validity of the proposed methods. The contribution from noise sources, expressed both in terms of sound pressure level and overall value, to the pass-by noise is evaluated up to 5 kHz. The virtual pass-by-noise assessment has been then validated by experimental measurement of the complete four coaches train with respect to 80 and 160 Km/h speed regimes.

Moderators
avatar for Wim van Keulen

Wim van Keulen

owner, VANKEULEN advies
expert in low-noise pavements: - psycho-acoustical labelling,- contracts,- courses,- product development,- questionnaires,- measurements.

Authors

Monday July 8, 2019 11:40 - 12:00 EDT
Outremont 5
  T15 Road & rlway noise & vibr., RS01 Railway noise & vibr