this report describes the use of a mathematical model of a two axled vehicle to predict dynamic wheel load variations as the model is passed over a road surface irregularity, and discusses the correlation obtained between theoretical and experimental results. correlation is shown to be good in terms of frequency and rather less good in terms of amplitude of dynamic wheel load, particularly for the initial peaks. the disagreement between the theoretical and experimental first peaks may be due to the effective stiffness of the tyres changing as they are distorted during passage over the severe surface irregularity. the body acceleration amplitudes are not comparable because the experimental results contain a significant high frequency component that the simple 'rigid mass' model cannot reproduce. varying the moment of inertia of the model's body is shown to have little effect on the values of dynamic wheel load. values of body acceleration and of body pitch decrease considerably as the moment of inertia increases. (a)

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