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The paper is armed at determining the mass and volume parameters of tractor trailers and looking far the qualitative and quantitative relations between the linear dimensions of the platform of transport vehicles and their mass and volume parameters. The mass and nominal loading capacity of trailers, as well as the volume of their plat form according to the main ramps were taken as the above parameters. The linear dimensions of the platform determine their internal length and width and the height by the mass ramps.  The investigated statistical binary relations are assessed by the coefficients correlation which augured additional values within the limits of 0.319–0.891, as well as by the correlation relations between the resultative indices according to factorial values from 0.530 to 0.868.  The qualitative chandes in the resultative indices depending on the factorial indices with the use of standard computer prodrams are described by the regression equations. In accordance with R2-coefficient by means of equalizing the experimental values of the investigated resultative indices by a set of approximizing functions the character of the corresponding changes is determined. Depending on the mass and nominal loading capacity of the trailer and the volume of the platform according to the main ramps its internal length is changed according to rectilinear dependences with additional angular coefficients its width – by gradually increasing hyperbolas, and the height of the platform according to the main ramps gradually increases according to the degree functions. With respect to the changes in the height of the platform depending on the investigated factorial indices by the equations of gradually increasing hyperbolas as to their asymptotes the authors have determined the marginal increase in the height of the main ramps of the platform. Along with the change in the mass and nominal loading capacity of the trailers from 0.735 to 7.10 t and from 2.0 to 24.0 t respectively per ton, the increase in the mass and loading capacity of the trailer the length of the platform increases with the same consequence by 424 and 152 mm. Along with the change of the platform volume per from 2.0 to 15.2 m3, its increase per m3 is accompanied by the increase in the length of the platform by 330 mm. Along with the increase of mass and loading capacity of the trailer in more than 4 and 10 t respectively, as well as the increase of the platform volume in more than 8 m3, the intensity of the increase of its width slows down gradually. The marginal increase in the height of the main ramps of the platform along with the change in its volume, mass and loading capacity of the trailer amounts to 713, 714 and 775 mm respectively.  The research results can be used for prognosticating the dimensions of the trailers under their calculation and design, as well as under the organization of the transporting support of the mechanized production of agricultural produce.

The Mass and Volume Parameters and the Linear Dimensions of the Platform of Tractor Trailers