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Bridging the Gap from Multibody Simulations to Acoustic Analysis

  • A. Heckmann
  • I. Kaiser
  • A. Carrarini
Part of the Notes on Numerical Fluid Mechanics and Multidisciplinary Design book series (NNFM, volume 118)

Summary

Multibody simulation plays an essential role in the initial design phase of railway vehicles in which conceptual issues are investigated. It is as well the state-of-the-art method in order to study and optimize the running dynamics and comfort of railway vehicles in details. However, acoustic issues could not be ad ressed so far by multibody analysis. This is due to the fact that the validity of the used multibody models is restricted to the very low frequency range. In addition, multibody methodology is not prepared to evaluate acoustic measures in order to assess a railway vehicle under consideration.

Provided that these two short-comings are resolved, multibody analysis is capable of supplementing and enhancing the tools currently available for assessing railway acoustics such as TWINS, FEM or BEM. The high computational efficiency, the capability to perform time domain analysis, the reuse of model-components and scenarios originating from comfort evaluations are advantages that motivate the extension of the multibody methodology towards acoustic analysis.

Therefore, this paper presents model enhancements of the contact behavior of wheel and rail that are intended to be used in simulations in the frequency range up to 2.5 kHz and higher. Then the concept of an acoustic pre-processing tailored for multibody analysis is proposed based on the evaluation of the sound power on the surface of vibrating elastic bodies. Finally, an example is given in order to demonstrate the application of the proposed methodology.

Keywords

Multibody System Acoustic Analysis Impulsive Noise Flexible Body Railway Vehicle 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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References

  1. 1.
    Thompson, D.J., Jones, C.: A review of the modeling of wheel/rail noise generation. Journal of Sound and Vibration 213(3), 519–536 (2000)CrossRefGoogle Scholar
  2. 2.
    Wallrapp, O.: Standardization of flexible body modeling in multibody system codes, Part 1: Definition of standard input data. Mech. Struct. Mach. 22(3), 283–304 (1994)MathSciNetCrossRefGoogle Scholar
  3. 3.
    Möser, M., Müller, G.: Handbook of Engineering Acoustics. Springer, Heidelberg (2009)Google Scholar
  4. 4.
    Kaiser, I., Heckmann, A., van der Linden, F.: On an ALE-approach for rotating elastic structures. In: Proc. of Multibody Dynamics 2007, ECCOMAS Thematic Conference, Milano (2007)Google Scholar
  5. 5.
    Ripke, B.: Hochfrequente Gleismodellierung und Simulation der Fahrzeug-Gleis-Dynamik unter Verwendung einer nichtlinearen Kontaktmechanik. VDI-Verlag, Düsseldorf (1995)Google Scholar
  6. 6.
    Pierce, A.: Acoustics. McGraw-Hill, New York (1981)Google Scholar
  7. 7.
    Carrarini, A.: Acoustic postprocessing for multibody simulations including flexible bodies. In: Proc. of Multibody Dynamics 2009, ECCOMAS Thematic Conference, Warsaw (2009)Google Scholar

Copyright information

© Springer 2012

Authors and Affiliations

  • A. Heckmann
    • 1
  • I. Kaiser
    • 1
  • A. Carrarini
    • 1
  1. 1.Institute of Robotics and MechatronicsDLR, German Aerospace CenterOberpfaffenhofenGermany

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