On the issue of the wheel power radius with an elastic tire

Introduction (statement of the problem and relevance). Mathematical modeling of the car units, mechanisms and systems functioning strongly depends on the used calculation parameters values, for example, on the power radius of the wheel. Nowadays to research the power radius of a wheel with an elastic tire both the radius of the driving wheel and the dynamic radius are taken into account. The article is to consider which of the two is the power radius of a wheel with an elastic tire.

The purpose of the study was to evaluate the influence of the chosen wheel power radius on the longitudinal characteristics mathematical modeling results of the tire adhesion with the supporting surface.

Methodology and research methods. Methods of mathematical modeling and experimental studies were applied, followed by the comparative analysis of both the experimental and analytical data.

Scientific novelty and results. The experimental dependences of the tire longitudinal adhesion coefficients on slippage have been obtained and compared using both the dynamic radius and the rolling radius as the power radius of the wheel in the driven mode.

Practical significance. The mathematical descriptions parameters of the tire adhesion characteristics have been refined which allowed reducing the errors of the calculation results significantly.

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