Research of dynamics of turning of machine-tractor aggregate with tractor on wheeled-crawler mover

In the article theoretical preconditions of a description of dynamics of manoeuvrability of machine-tractor, aggregates with a wheeled-tracked mover are considered. For a machine-tractor aggregate with half-tracked progress theoretical formulas of determination of an actual turning radius, the moment of resistance of turn and torque for rotation are obtained. The theoretical preconditions are confirmed by experimental research of the manoeuvrability of the machine-tractor aggregate with the tractor on a halftracked progress, made as the experimental sample. The dependences of the turn coefficient and the resistance coefficient of the turn are obtained, and the correlation coefficients and their significance have confirmed the existence of a stable connection between the changing parameter and the response function. Proceeding from theoretical and experimental research, it is possible to draw a conclusion that the manoeuvrability of the tractor with a wheeled-crawler mover does not concede to the tractor in the basic execution

Tractor efficiency improvement by converting power unit to gas-diesel fuel system

Converting the power units of existing transport and transportation vehicles to NGV fuel requires not only the creation of the necessary infrastructure for trouble-free operation of such machinery, but also significant investments for the initial installation of the relevant NGV equipment. Various evaluation criteria are used to justify the feasibility of such a conversion. The authors have studied the conversion of diesel engine D-243 of tractor MTZ-82 to the gas-diesel cycle and determined its efficiency and power indicators in the laboratory and field tests. The paper assesses the economic efficiency of the operation of a power plant based on the diesel and gas-diesel cycle by comparing the fuel consumption and costs per hectare in the operation of a tractor MTZ-82 and a cultivator KPS-4 for soil treatment

Application of bayes algorithm for indiscriminate diagnostics of motor and tractor engines

Currently, the non-disassembly inspection method of internal combustion engines is one of the most promising methods of assessing their technical condition. This method makes it possible to significantly reduce the intensity of the labour of the diagnostic process and, at the same time, increase its reliability. The paper proposes a method for indiscriminate engine diagnostics based on the Bayes algorithm

Improving the operational efficiency of tractors by ensuring their ability to perform work

Development of agriculture in conditions of market relations is accompanied by aggravation of the problem of efficiency of use of technics. In this connection, the task of scientists is to increase the actual volume of work performed by tractor units, reducing the cost per unit of production. The high cost of tractors, the lack of personnel, the reduction of technical equipment of farms and the increase in the volume of products produced in the agro-industrial complex, natural and climatic conditions impose special requirements on technical service to maintain tractors in working conditions. The working state of tractors is the state at which values of parameters, which characterize ability to execute the given functions, correspond to normative-reference and design documents. During the operation of tractors in agriculture under the influence of various factors, wear of their parts and knots. The indicator determining the value of wear is the residual resource of aggregates and knots of technics. In the article the questions of influence of residual resources of basic aggregates and systems of tractor on frequency of failures of various groups of complexity are considered. Experimental research on determination of dependencies of residual resources of tractor units and frequency of failures of different groups of complexity, on the basis of which the rules of replacement of the unit whose resource are exhausted, is carried out, i.e. is replaced with a full of the resource (new) or on the aggregate after overhaul

Study of the intake system of automotive tractor internal combustion engines with variable parameters

Increasing the effective performance of automotive tractor engines is primarily associated with the intensification of the working process parameters. One of the options for solving this problem is to improve the cylinder filling parameters, which will allow to increase the engine power and torque. In addition to mechanical and gas turbine supercharging, the little-studied resonant supercharging of the engine is of interest. In this case, by selecting the parameters of the inlet path of the engine, it is possible to achieve a significant increase in pressure in the zone of the inlet valve opening without expenditure of useful energy, using only the kinetic energy of the gases of the inlet path. The paper proposes a method to calculate the geometric parameters of the intake tract using a one-dimensional model of gas flow. The results obtained from the numerical investigations give good convergence. The article can be useful for masters, graduate students, and engineering and technical workers involved in the design of internal combustion engines