The purpose of the research is the implementation of a scientifically based approach to the assessment of technical and operational parameters of the irrigation machine “Fregat” under the conditions of a complex microrelief of the irrigated area. The parameters studied were skidding, braking and rolling of bogies while passing the irrigated areas with different gradients. The analysis of the effect of gradient values on bogies’ flotation was carried out, the dependencies of solution of the differential equations of the bogies motion were predicted when forecasting the displacement process disruptions associated with the change in the slopes’ limiting values. The solution of the theoretical problem on the estimation of the sprinkling machines “Fregat” bogies’ motion on slope sections with their group rolling down based on experimental data on the slopes of the irrigated areas microrelief on the investigated farms is realized. The initial data for the calculations were obtained during two irrigational seasons from 2015 to 2016, the cases of the mechanical braking operation, hydraulic protection systems as a result of skidding and rolling of 4 sprinklers “Fregat” bogies equipped with rigid wheels and pneumatic tires were investigated. As a result of research, the implementation of a theoretical tools based on the second order Lagrange differential equations, which allow to determine the permissible altitude coordinates of the sprinkler passages when rolling, skidding and braking of bogies was confirmed. Assessment of the bogies flotation showed that at the same value of Pï soil bearing capacity, the need in installing brakes for bogies on rigid wheels appears at higher slopes than on pneumatic tires. So, at Pï = 30 kPa, the braking for rigid wheels should be set at i > 0.29, and for wheels on pneumatic tires – for i > 0.18; at Pï = 180 kPa – for rigid – i > 0.16, for pneumatic – i > 0.05.
Key words: sprinkler, reliability, irrigated area, mechanical protection system, hydraulic protection system.
