Some issues of the propulsor parameters optimization of multi-purpose wheeled vehicles

Introduction. It is known that the traction and coupling properties and the cross-country ability of multi-purpose wheeled vehicles (MPWV) on soil surfaces depend both on the mover parameters of these machines and on physicomechanical properties of the movement surfaces. The article discusses the optimization of these machines propulsors parameters, depending on road conditions and physicomechanical properties of the soil surface.

The purpose of the study was to develop recommendations for optimizing the propulsion parameters of promising MPWV designed for operation and movement on soil surfaces.

Methodology and research methods. The research methodology was based on the results of the analysis of modern studies on soil mechanics being under the effect of a dynamic load and was to formulate a complex of dependencies that determined the interaction process of driven and driving wheels with the soil surface. The main dependencies under applied dynamic loads were soil resistances to compression and shear. A method of theoretical study of the traction and coupling properties and passability of wheel propulsors when driving on dirt surfaces was used.

Scientific novelty and results. The result of the theoretical studies has been the development of optimization issues for the propulsers of the designed MPWV designed for operation and movement on soil surfaces and the rationale for the optimization algorithm. The novelty lies in the fact that when considering the process of interaction of a wheel with a soil surface, modern dependences of soil resistance to compression and shear are applied. They are based on the use of coefficients values in the equations reflecting a particular physical state of the soil surface and describing these processes, and which differ from empirical coefficients used in most studies. The research also uses the modern idea of replacing an ordinary wheel with a hard one, of a larger diameter, which allows analytical studies to be carried out in a wide range of propulsion parameters including the physical and mechanical characteristics of the soil surface.

Practical significance. The above optimization algorithm allows at the design stage of the wheeled vehicle propulsion to determine its towing and coupling properties and its passability when driving on a groud surface.

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