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.
Quarter car model stress analysis for terrain/road profile ratings
Bewertung von Gelände-/Straßenprofilen mit Hilfe der Spannungsanalyse an einem Viertelwagen-Modell
International Journal of Vehicle Design ; 36 , 2/3 ; 248-269
2004
22 Seiten, 21 Bilder, 10 Quellen
Aufsatz (Zeitschrift)
Englisch
Spannungsanalyse , Lebensdauer , Ermüdungslebensdauer , Lebensdauervorhersage , Straßenbelag , Kraftfahrzeug , Auslegung (Dimension) , Spannungsberechnung , Geländefahrzeug , Anwendung im Fahrzeugbau , quadratischer Mittelwert , Leistungsspektrum , Fahrzeugfederung , theoretisches Modell , Fahrgeschwindigkeit
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