The prediction of tyre forces is of great interest to both the designers and users of off-road vehicles. The magnitude of tractive force can determine the size of implement, which may be pulled and the rate of work. The lateral force controls the steer-ability and handling of an off-road vehicle. The rolling resistance force should be minimised to ensure that the energy wasted in overcoming motion resistance force is as small as possible. In this paper, two types of tyre models, empirical and physical, were examined. An example for each type of tyre models, was focused. The multi-spoke tyre model was chosen as physical based model while the Magic Formula and the mobility numbers method, were elected as two different types of empirical models. A comparison between the results of these tyre models for the pure cornering case and pure slip case under the same conditions was made. Computer programs in MATLAB software were developed for this purpose. The suitable model that used to predict off-road tyre forces, was selected. The results indicated that, the model based on the physical properties, the modified spokes tyre model, is the suitable model used in this work. It is better for understanding the mechanics of off-road tyre than the empirical models. It can be modified to study the effect of overall off-road tyre characteristics on the performance. Also, the results of the spokes tyre model opens up the opportunity in future to use it in detailed modelling of different aspect of off-road vehicle dynamics.
Prediction of the performance of off-road tyres
Vorhersage der Laufeigenschaften von Geländefahrzeugreifen
1998
16 Seiten, 11 Bilder, 3 Tabellen, 21 Quellen
Aufsatz (Konferenz)
Englisch
Prediction of the Performance of Off-Road Tyres
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