Quarter car model stress analysis for terrain/road profile ratings Online publication date: Tue, 28-Sep-2004
by J. Gavin Howe, Jeffrey P. Chrstos, R. Wade Allen, Thomas T. Myers, Dongchan Lee, Chi-Ying Liang, David J. Gorsich, Alexander A. Reid
International Journal of Vehicle Design (IJVD), Vol. 36, No. 2/3, 2004
Abstract: 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 relatively 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 highway industry. The IRI consists of a simple tyre model and quarter car vehicle model run at a specified speed to estimate suspension velocity over a road profile. Another method of estimating road roughness is fatigue analysis. In this study, a generic specimen was subjected to the quarter car suspension forces. The stresses developed were used to make a fatigue life cycle prediction. This paper presents the key concepts and results from this analysis.
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