The US Army currently uses the root mean square of elevation (RMSE) and power spectral density (PSD) to characterise road/terrain roughness for ground vehicle durability assessment. This paper describes research aimed toward improving these measures. One potential method is running a relative simple, yet vehicle class specific model over a given terrain and using predicted vehicle response(s) to characterise the terrain. A precedent for this concept is the International Roughness Index (IRI), used in the higway industry. The IRI consists of a simple tyre model and quarter car vehicle model run at a specified speed to estimate suspensions velocity over a road profile. Another method of estimating road roughness is fatigue analysis. This paper presents the results of using fatigue analysis in conjunction with a quarter car model to rate road roughness. A generic specimen was subjected to the vehicle model suspension forces. The stresses developed in generic specimen for a given road profile were used to make a fatigue life cycle prediction for the example roadways. This method of rating terrain was shown to be more sensitive to detecting short sections of rough road. The key concepts are presented.


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    Title :

    Quarter car model stress analysis for terrain/road profile ratings


    Additional title:

    Bewertung von Gelände-/Straßenprofilen mit Hilfe der Spannungsanalyse an einem Viertelwagen-Modell



    Published in:

    Publication date :

    2004


    Size :

    22 Seiten, 21 Bilder, 10 Quellen




    Type of media :

    Article (Journal)


    Type of material :

    Print


    Language :

    English




    Quarter car model stress analysis for terrain/road profile ratings

    Howe,J.G. / Chrstos,J.P. / Allem,R.W. et al. | Automotive engineering | 2004


    Quarter car model stress analysis for terrain/road profile ratings

    Howe,J.G. / Chrstos,J.P. / Allem,R.W. et al. | Automotive engineering | 2004



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