Verification of scale models in the experimental study of the motion parameters of a wheeled vehi-cle on deformable grounds

Designing new vehicles requires verifying technical solutions using not only simulation techniques but also full-scale models. Full-scale road tests provide a complete dynamic similarity. However, such tests can be conducted only after manufacturing a prototype, which involves heavy capital outlays. Furthermore, various designs of numerous structural elements are difficult, and often impossible, to analyze during field tests. One of the solutions to this problem is to create scale models of the vehicle under study. The main difficulty in testing scale models of a wheeled vehicle (tractor) is that it is required to provide realistic road conditions with high fidelity. The validity of the results is guaranteed by satisfying similarity criteria. In this paper, a relation between the parameters of a wheeled tractor and its scale model intended for the experimental study of dynamic stabilization algorithms is established. Similarity coefficients and a scale range within which the effectiveness of stabilization algorithms can be adequately investigated are determined. To prove the validity of the tests with scale models, the motion of a model wheel on the ground was compared with that of a prototype drive wheel. The results of these experiments were used to establish the dependence of the friction coefficient j on the slippage S_b for both wheels. The fact that the obtained characteristics are in good agreement proves the applicability of the proposed scale model to the experimental study of the motion parameters of wheeled vehicles on deformable grounds.

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