Improving the efficiency of technical service enterprises at the expense of specialization, power and their location

    Mathematical Modeling, Vol. 5 (2021), Issue 2, pg(s) 66-69

    Were selected queuing systems with different load, queue length and type of mutual assistance for the calculation of technical and economic indicators of technical service enterprises. The models of functioning A, B, C are given, which mainly reflect the properties of the internal environment of technical service enterprises. For the form of labor organization (model B), partial mutual assistance between the performers is provided, a mathematical model with a limited queue length is adopted. Optimization of the capacity of technical service enterprises is expressed in determining the number of service posts. The dependence of the level of competitiveness of technical service enterprises of the average and maximum possible queue length, the expected cars is obtained. When observing the structure of technical service in Dnipro, changes in the number of technical service enterprises were obtained by type of work performed, depending on the years of work. It has been substantiated that the criterion for choosing the type of specialization, location and capacity of service enterprises is the payback period of capital investments. It was optimized selection of a service company for forecasted demand, accommodation and specialization in a competitive environment.


    Justification of kinematic parameters of coupling for wide-span row-crop unit

    Mechanization in agriculture & Conserving of the resources, Vol. 65 (2019), Issue 5, pg(s) 156-158

    Effective use of the KhTZ-160 tractor is possible, with the specified width, combining the implementation of the main technological process with an additional, i.e. sowing with cultivation. Shows the results of calculations of the transverse displacements of the working bodies as a function of their placement along the width of unit and along its length relative to the transverse geometric axis that passes through the kinematic the center of the tractor without taking into account the curvature of the trajectory of tractor and possible changes in the position of kinematic center along the unit. The largest values of the transverse displacements of the working bodies, which are placed at a distance of 2.6 m, i.e. at the machine which is attached to the rear hinged system of the tractor, reach 14.5 cm at maximum angles of rotation of the unit (3 degrees). The smallest transverse movements of the working bodies are observed when placed on a geometric axis that passes through the axis of the rear wheels (less than 1 cm). The lateral movements of working bodies of 18-row wide-coverage row-crop unit depending on the tractor turning angle and their placement in the unit are considered. Kinematic parameters and coupling scheme are recommended.