The impact of wheel spacing on allowable force applied to the axis of the agricultural vehicle

Rafał Nowowiejski, Jan B. Dawidowski, Wiesław Janicki


The objective of the study was to develop computational methods for determination of the impact of the twin-wheels (their positioning along the axis) and soil conditions, specified by the stress concentration factor, on the limit values of the forces loading the axis of the agriculture vehicle, thus reducing the risk of excessive soil compaction. The formula of Boussinesqu (1885) supplemented by Frȍhlich (1934) with the stress concentration factors was used. The values of the limit force were determined by adopting assumptions that wheels loaded soil surface in points and stress caused in soil should not exceed its agro-technical bearing capacity defined by the value of the limiting stress. The developed method allows setting the limit value of twin-wheelbase, at which the effect of adjoining force onto stress in soil semi-space fades away. This means that through a relatively small change of a wheelbase, it is possible to achieve more convenient conditions of load transfer on soil, in the context of the risk reduction of excessive soil compaction. The proposed method enables to construct diagrams for calculation of allowable axis load on the base of the known value of stress within the soil profile which determine its agro-technical capacity.


agricultural vehicles; twin-wheels; allowable axis load; twin-wheelbase; computational method

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ISSN: 2083-1587 (print)
ISSN: 2449-5999 (online)

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