This paper presents an uncertainty analysis of aerodynamic force and moment coefficients for production vehicles in an automotive wind tunnel. The analysis uses a Monte Carlo numerical simulation technique. Emphasis is placed on defining the elemental random and systematic uncertainties from the tunnel’s instrumentation, understanding how they propagate through the data reduction equations and under what conditions specific elemental error sources are or are not important, and how the approach to data reduction influences the overall uncertainties in the coefficients.The results of the analysis are used to address the issue of averaging time in the context of maintaining a maximum allowable uncertainty level. Also, a maximum error requirement in the vehicle’s installation is suggested to allow the use of rapid but approximate vehicle alignment methods without incurring errors that exceed the data uncertainty.Observed reproducibility results are presented spanning a 16 month period. The uncertainty of the drag coefficient over this period is shown to be ±0.002 at the 95% confidence level, with similar results for the other key coefficients. As the analysis presented in the paper focuses only on those uncertainty sources that can be captured explicitly by the data reduction equations, the observed variations are higher than the calculated uncertainties.


    Zugriff

    Zugriff prüfen

    Verfügbarkeit in meiner Bibliothek prüfen

    Bestellung bei Subito €


    Exportieren, teilen und zitieren



    Titel :

    Uncertainty Analysis of Aerodynamic Coefficients in an Automotive Wind Tunnel


    Weitere Titelangaben:

    Sae Technical Papers


    Beteiligte:
    Williams, Jack (Autor:in) / Walter, Joel A. (Autor:in) / Nagle, Paul A. (Autor:in) / Rout, R. K. (Autor:in) / Jacob, Stephen (Autor:in) / Walter, T. Mark (Autor:in) / Canacci, Victor (Autor:in) / Koester, Wayne (Autor:in)

    Kongress:

    SAE 2005 World Congress & Exhibition ; 2005



    Erscheinungsdatum :

    11.04.2005




    Medientyp :

    Aufsatz (Konferenz)


    Format :

    Print


    Sprache :

    Englisch




    Uncertainty analysis of aerodynamic coefficients in an automotive wind tunnel

    Walter,J.A. / Canacci,V. / Rout,R.K. et al. | Kraftfahrwesen | 2005


    2005-01-0870 Uncertainty Analysis of Aerodynamic Coefficients in an Automotive Wind Tunnel

    Walter, J. A. / Canacci, V. / Rout, R. K. et al. | British Library Conference Proceedings | 2005


    Aerodynamic Calibration of an Automotive Climatic Wind Tunnel

    Britcher, Colin / Stephenson, Philip | AIAA | 2005



    Aeroelastic Wind Tunnel Test for Aerodynamic Uncertainty Model Validation

    Dai, Yuting / Wu, Zhigang / Yang, Chao et al. | AIAA | 2012