Nowadays a great attention is paid to the level and quality of noise radiated from the tailpipe end of intake and exhaust systems, to control the gas dynamic noise emitted by the engine as well as the characteristics of the cabin interior sound. The muffler geometry can be optimized consequently, to attenuate or remark certain spectral components of the engine noise, according to the result expected. Evidently the design of complex silencing systems is a time-consuming operation, which must be carried out by means of concurrent experimental measurements and numerical simulations. In particular, 1D and multiD linear/non-linear simulation codes can be applied to predict the silencer behavior in the time and frequency domain.This paper describes the development of a 1D-multiD integrated approach for the simulation of complex muffler configurations such as reverse chambers with inlet and outlet pipe extensions and perforated silencers with the addition of sound absorbing material. The 1D-multiD integrated approach is exploited to validate the transmission loss prediction of reverse chamber configurations with inlet and outlet extensions. Results have pointed out the capability of capturing transversal resonances at high and mid frequencies. Moreover, a non linear approach is proposed to take into account the presence of the sound absorbing material into the conservation equations of a multidimensional solver. The properties of the sound absorbing material have been taken from correlations adopted in the literature for 1D models. The momentum and energy conservation equations have been modified to take into account the interaction between the gas and sound absorbing material. Both the 1D and the integrated 1D-multiD approach have been exploited for validation, considering two different geometries: an expansion chamber with an extended outlet pipe, with the sound absorbing material placed between the pipe extension and the canning, and a perforated pipe whose cavity has been completely filled with sound absorptive metallic wool. The results obtained by the fully 1D analysis and the integrated approach are in agreement with the measured muffler performances.


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    Titel :

    A Coupled 1D-multiD Nonlinear Simulation of I.C. Engine Silencers with Perforates and Sound-Absorbing Material


    Weitere Titelangaben:

    Sae International Journal of Passenger Cars. Mechanical Systems
    Sae Int. J. Passeng. Cars – Mech. Syst


    Beteiligte:
    Onorati, A. (Autor:in) / Montenegro, G. (Autor:in)

    Kongress:

    SAE World Congress & Exhibition ; 2009



    Erscheinungsdatum :

    2009-04-20


    Format / Umfang :

    13 pages




    Medientyp :

    Aufsatz (Konferenz)


    Format :

    Print


    Sprache :

    Englisch





    Modeling of Silencers for I.C. Engine Intake and Exhaust Systems by Means of an Integrated 1D-multiD Approach

    Montenegro, G. / Onorati, A. / Society of Automotive Engineers | British Library Conference Proceedings | 2008


    Experimental Investigation of Nonlinear Acoustic Properties for Perforates

    Bodén, Hans / Guo, Ying / Tözün, Hüseyin Bora | AIAA | 2006


    Acoustic Attenuation Performance of Perforated Absorbing Silencers

    Selamet, A. / Lee, I. J. / Huff, N. T. et al. | SAE Technical Papers | 2001


    Cascaded Perforates as One-Dimensional, Bulk Absorbers

    Parrott, Tony / Jones, Michael | AIAA | 2006