The question of the economic-mathematical modeling of working process of trailed scraper working with a tractor-pusher. The modeling was done on computer taking into account the technical parameters of the tractor and the pusher, ground and road conditions, as well as the cost of the equipment, capital and replacement costs. The presence of a rational capacity bucket scraper, providing the maximum output per shift and reduced unit development costs of 1 m3 of soil. The positive effect of the operation at the chain scrapers, wheel tractors and the need for dogugaeshi devices, increasing the coupling weight of the tractor wheel.

In work the questions of rational aggregation of traction machines (uniaxial and biaxial tractors) with working machines on the example of scrapers are considered. The possibility of reducing the redistribution of vertical loads to the prime mover during the development of the ground and reducing the metal consumption of the base part of the working machine is established.

There was suggested and validated the criterion of functional efficiency of a hoisting crane in the form of a unified mathematical model. This model includes the model of structural interrelationships of large assembly units which is general for the known hoisting crane constructions; the model of the mathematical formulation of functional interrelationships of hoisting crane large assembly units; the design procedure of values of functional efficiency criterion. The concept of functional efficiency is formulated. Based on the examples of cranes of different types, there were shown the formation features of structural interrelationships of large assembly units of crane constructions; the example of synthesis of the corresponding structural formulas is provided; the building of the mathematical model of functional interaction of large assembly units inside the crane is shown; the matrix of interaction is semantically decoded.

The article deals with methods for the implementation of a geometric problem in CNC machines using digital differential analyzers. The advantages and disadvantages of the implementation of interpolation in CNC systems by various methods are considered, special attention is paid to the general methods of digital differential analyzers in the implementation of the interpolation of the movement of the working organs of the machine tool. Interpolation methods are analyzed in which the Euler method is used for numerical integration, based on the expansion of the function in a Taylor series with discarding the highest (second and higher) degrees of expansion. The mathematical formalization of the construction of complex curves is shown by the methods of digital differential analyzers — plane curves of the second order, such as parabola, hyperbola, ellipse.

The article is devoted to the topical issue, which is related to simulation of the failures of drives suspensions of the conveyor with suspended belt and distributed drive. Using the developed mathematical model of the failures drives suspensions due to the breakage of the electric circuit to the reference design of conveyor with suspended belt and distributed drive is performed modelling of dynamic characteristics. Investigation of the influence of the location of the failed drives suspensions on the track on the main technical characteristics of the conveyor belt with suspended belt was carried out.

An approaches to the study of the fatigue strength of a freight car 18-100 bogie’s side frame are under consideration in this article. There is a decline of the quality of the manufacture side frames and increase of the number of defects, which leads to an increase the number of accidents. The relationship of the stress intensity factor and crack length for different types of fatigue cracks (surface crack and full perforation) was introduced. The algorithm of a bogie with a crack fatigue calculation was introduced. The inhibition of crack growth under overloading was taking into account during calculation. The additional numerical calculation of fatigue strength was performed by the specialized software package. Some defects of bogie larger than 1 mm is unacceptable as it dramatically reduces the fatigue strength.

In order to clarify the method of determining the value of the braking distance to determine the maximum deceleration of the vehicle by braking all wheels ATS when using the differential equation of motion of the car was removed dependence, which more precisely characterizes the size of tor brake way. Approximation of existing dependencies, obtained by the authors of theoretical and experimental researches allows to make a comparative analysis of the results determine the stopping distance of a PBX depending on its velocity before braking. The offered technique allows to take into account the factors of road conditions the operation of the exchange that affect the risk of collision and reduce injuries to drivers.

The purpose of calculating the plan for the formation of trains in the directions is to calculate the average daily costs of car-hours for the accumulation of trains. The article gives a detailed analysis of the process of accumulation of wagons for the composition in the sorting park of the station based on the average wagon accumulation schedule. New formulas are proposed for determining the average daily cost of car-hours for accumulation. The calculation is given and the average statistical values of the investigated quantities are determined. Practical significance: is the detailed consideration of the process of accumulation of cars taking into account the arrival of individual groups of cars, which determine the costs of car-hours for the accumulation of wagons.

The article considers one of the promising methods of surface hardening of piston aluminum alloy – microarc oxidation. Described fundamental differences from the micro-arc oxidation anodizing and similar electrochemical processes. The schemes of formation of the barrier and outer layers surface treatment in aqueous electrolytes. Shows the mechanism of formation of the interface. Considers the formation of layers with high porosity and method of exposure. Also describes the exponential dependence of the current density from the electric field in the surface film of the base metal. The role of discharges in the formation of oxide layers on the treated surface. Proposed and described features of the three main theories of formation of oxide films on the surface of the piston: physical and geometrical model of Keller; models of formation of oxide films as a colloid formations and plasma theory (theory of oxidation with the formation of plasma in the zone of oxidation). The features of formation of films in each of the models. For the model of Keller porous oxide film is a close-Packed oxide cell, having the shape of a prism. They are based on a hexagonal prism. These cells have normal orientation to the surface of the metal. In the center of the unit cell there is one season that is a channel, whose size is determined by the composition of the electrolyte, the chemical composition of the base metal and the electrical parameters of the process of oxidation. In the micro-arc oxidation process according to this model, the beginning of the formation of cells occurs with the formation of the barrier layer, passing in the porous layer and, over time, the elongation of the pores, due to the constant etching electrolyte. In the theory of formation of the oxide films as kolloidnyh formations revealed that formation of pores in the film is a result of their growth. The anodic oxide is represented by a directed electric field, the alumina gel colloidal and polymeric nature. Plasma theory explains most of the issues related to the appearance of the characteristic luminescence with micro-arc oxidation. According to this theory, constantly existing barrier layer is not present at the time of current interruption is polymerization from the attached directly to the anode thin layer of ionized gas. He is constantly in a state of seething and updates that explains the high rate of polymerization and phase of aluminum oxide and heterogeneity parameters of the obtained anodic oxide thickness. The work also describes the main characteristics, which determine the rate of formation of oxide layers on the surface of aluminum alloys.

At present, the organization of transportation by rail is associated with the processing of trains and wagons along the route. Accommodation and equipping of technical stations play a major role in the organization of the transportation process. The uninterrupted operation of the technical stations ensures the stability of the railway transport as a whole. The distance between the technical stations determines the duration of operation of the locomotive crew, the efficient use of the locomotive, the required number of locomotive crews and locomotives for carrying out the transportation plan, and also improves the main indicators of the railway. However, often train locomotives do not fulfill their assigned tasks due to the lack of time for the locomotive crew in order to deliver the train to the nearest technical station, as well as the irrational use of the standard time of the locomotive crew. In connection with the expectation of delivery, the locomotive brigade replacing the locomotive, the idle time of the wagons at the intermediate stations increases. All this makes it difficult to control the movement of trains and reduces the speed of moving cars on the railway transport. The purpose of the study is to develop a method for placing technical stations on a railway test site in the course of an electric traction. To achieve this goal, it will be necessary to solve the following tasks: generalization of the main parameters of the location of technical stations; determination of half-races between technical stations in the operation of one locomotive brigade; search for the required number of change of the locomotive brigade; determination of the distance between technical stations. The methods of research are based on the generalization and analysis of existing results in finding the rational location of technical stations. Results: It is revealed that the first step for the rational placement of technical stations is to determine the traction arm of the locomotive. When determining the length of the traction arm, the ways of using the locomotive for the duration of working time by one locomotive crew are considered. Practical significance: The rational placement of technical stations according to the proposed methodology will ensure the advancement of trains with the least number of parking lots for the replacement of locomotives, locomotive crews and inspection of rolling stock.

Given the application of the methods of analysis of types and consequences of failures (FMEA analysis) to assess the technical risk of occurrence of emergency situations during the operation of the lifting mechanism electrical hook bridge crane. The technique allows to identify the limiting elements and to determine the significance of effects in the design of the lifting mechanism, to develop measures to reduce the risk of the occurrence of an emergency.