Mathematical models allowing to optimize the main characteristics of air supply system of mobile power units’ cabs are given.
The article presents the results of researches conducted with the use of computer that allow to estimate the influence of tractor unit parameters on possibility of self-excited oscillations of wheeled tractor frame in the case of its moving under load that causes significant slipping of driving wheels.
The paper proposes a functional diagram for system of secondary utilization of engine waste heat. The system is used for preheating and heat regimes optimization in aggregates of self-propelled vehicles operating in wide range of ambient air temperatures. The system includes recuperative heat exchanger of utilization circuit equipped with automatic control of its heating efficiency, heat consumption circuits and electronic control devices.
Key provisions of formation of toxic components in exhaust gases of automotive engines are presented, main methods designed to clean them are described.
Designs of flat-slotted irrigated packings of regular structure made of cogged plates of cellular plastic with different air flow regimes in their channels are considered. It is shown that in case of intensification of heat and mass transfer by means of artificial turbulization of air flow in channels the significant reduction is provided in size of packing after reaching of required efficiency of air temperature reduction and acceptable aerodynamic resistance.
Causes limiting the mass use of fuels produced from biomass in the energy consumption of domestic agroindustrial complex are analyzed. A method for improvement of performance indices of tractor diesel operating on biofuel is proposed. Results of experimental testing of the method are given.
The article deals with issues of gear shifting modeling and a method of piecewise stepless regulation of tractors speed, based on rational choice of sufficiently small range of engine corrector characteristic, in which the power doesn’t decrease below nominal one and fuel efficiency is saved.
The article presents a model of particles movement in the flow of grain mass by means of screw turns of rotary separator with longitudinal arrangement of rotor. The instances of mobile casing and stationary one with screw guide ribs and without them are considered. Theoretical efficiency estimation of rotation of casing and guide ribs is given.
The article presents the results of research of methanol use influence on nitrogen oxides content in the cylinder of 2Ч 10,5/12,0 diesel engine with binary system of fuel supply. Diagrams of methanol use influence on combustion process indicators, volume content and mass concentration of nitrogen oxides in the cylinder depending on change in crankshaft angle of engine are given.
Influence of design and operating parameters on quality indices of plough performance is researched theoretically. Dependence of desired disk load on its radius, travel depth, thickness, sharpening angle and forward speed is considered.
Results of theoretical researches revealing the dependence of specific work of forages shredding on design and technological parameters of a shredder are presented. A formula is obtained; on its basis diagrams of specific work alteration depending on rotor hammer offset are constructed. It is revealed that rotor radius has the greatest influence on shredding process.
The article considers the efficiency of feeding device of installation for mixtures preparation. Related tests estimating the quality of feeding device are carried out, parameters of obtained mixture are defined.
The paper deals with the results of theoretical and experimental studies determining the limit values of adjustment parameters of tillage machines and drills, providing the quality of performing operations that complies with agrotechnical requirements.
Results of field tests of a semi-trailer horizontal spindle cotton-picking machine are given. The possibility of its application on released selection variety of cotton with high quality indices of picked cotton is determined.