Rolling noise is the main source of railway noise for a wide speed range. It is then essential for a railway company to understand the generation mechanisms to control it. Until now, SNCF, the French railway company, has used TWINS, the Track Wheel Interaction Noise Software, to predict the rolling noise. Based on the frequency---domain approach, this software is very efficient for the case of straight standard ballasted tracks. However, as it runs in the frequency domain, this software is limited to cases of wheel and rail without discrete irregularities. A time---domain approach has been then considered to extend the rolling noise modelling to the case of impact noise due to discontinuities, such as wheel flats or rail joints. The main challenge in the development of a model running in the time domain is to simulate an infinite structure with a finite numerical model. Here, absorbing boundary conditions, using an impedance technique, have been developed for the case of a finite Euler---Bernoulli beam model representing the rail. The full problem has been solved using a finite difference scheme. The performance of the absorbing boundary conditions has been studied by comparing the results with the ones obtained for the case of free-boundary conditions.


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    Title :

    Rolling Noise Simulation: A New Approach in Time Domain


    Contributors:
    Delavaud, V. (author) / Chaigne, A. (author) / Poisson, F. (author)


    Publication date :

    2012


    Size :

    9 Seiten





    Type of media :

    Conference paper


    Type of material :

    Print


    Language :

    English




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