Advances In The Modelling Of Motorcycle Dynamics

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Starting from an existing sophisticated motorcycle dynamics model, which permits simulation of reasonably common motions and stability, modal and response computations for smaller perturbations from any trim condition, improvements are described. The outcomes show the predictions of the model to be in basic agreement with observations of motorcycle behaviour from the field and they suggest that frame flexibility remains an critical design and analysis location, in spite of improvements in frame designs over current years. In certain, the "Magic Formula" motorcycle tyre model is utilised and complete sets of parameter values for contemporary tyres are derived by identification strategies. The new model is employed for steady turning, stability, design and style parameter sensitivity and response to road forcing calculations. These concern (a) tyre/road make contact with geometry, (b) tyre shear force and moment descriptions, as functions of load, slip and camber, (c) tyre relaxation properties, (d) a new analytic remedy of the monoshock rear suspension mechanism with sample outcomes, (e) parameter values describing a modern higher performance machine and rider, (f) steady-state equilibrium and energy checking and (g) steering manage. Motorcycle rider parameters have important influences on the behaviour, with final results consistent with a typically held view, that lightweight riders are much more likely to endure oscillation complications than heavyweight ones.

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