The review of ways of welding of elements of bodies of cars is carried out. Merits and demerits of spot contact welding and a way of welding with use of the high-concentrated power sources are considered. The processes which are taking place in a zone of a welded seam when using laser welding are in details considered.

Keywords: metal welding, welded seam, laser welding

Researches of hardness of various steel grades for the purpose of determination of density of their distribution and distribution of extremes of selections are conducted. Results of the received researches are used for definition of a resource of details with use of a graphic method of transition from selection to set.

Keywords: selection, fatigue resource, population of final volume

The article studies the problems of training of students in construction universities. The actual curricula of training, the possibilities of the educational environment, the requirements for the teaching staff are analyzed. The most acute and important problems are identified in the field of education, primarily in the construction sector

Keywords: training in a construction college, pedagogy, technical specialties

The experience of the research work of the students of the department "Organization of construction" is studied. The main directions of work, problems and ways of the most effective organization of scientific research work are revealed.

Keywords: organization of construction; organization of research work of students

Numerical simulation is becoming more and more widespread when solving the problems of air distribution and inflow air rate. One of the questions of using CFD approaches legitimacy is the possibility of a reliable description of the flow in modern air distribution devices. In the present work, physical and numerical experiments were carried out for the SMK 200 jet nozzle diffuser. Velocity profiles were taken at various distances from the jet nozzle during the physical experiment. Numerical investigation tool was the integrated package STAR-CCM +. Numerical simulation was carried out using various turbulence models. Simulation results showed that the use of the k-ɛ models allows to describe the parameters of the flow with sufficient accuracy. Number of cells required for the correct flow description in modern air distribution device is suitable for practical application.

Keywords: air distribution, numerical simulation, turbulence models, physical experiment, jet nozzle diffuser, STAR-CCM+

The complexity and high cost of multiplexing optical fiber sensors is still the main limitation for the widespread introduction of sensory systems, both distributed and quasi-distributed, and point-like. The article proposes a new multiplexing method that takes advantage of both broadband and two-frequency radio-photon multiplexing systems. The simplest broadband radiator is taken from the first, but a complicated and expensive system of spectrometry is not used to determine the central wavelength of fiber Bragg gratings. From the second, a recording system is used at the beat frequency between two components, but an expensive system for generating two- and polyharmonic probing systems is not used. The multiplexing parameter is determined by the frequency of separation between the transparency windows of a fiber Bragg grating, for example, with two phase π-shifts, which differs by a certain value for each of the sensors. The mechanism of modeling of gratings of the specified type is given, in principle the possibility of multiplexing of various number of sensors is shown. When using sensor networks built on the basis of passive optical, the number of multiplexed sensors can reach 256, with all sensors having the same Bragg wave of the wave, and can be combined into tree, bus and other topologies.

Keywords: fiber Bragg grating, phase inhomogeneity, fiber optic sensor, multiplexing, transparency window, frequency difference between transparency windows, beat frequency

Theoretical studies of the temperature distribution during laser heating of the TiO2 precursor film on the FTO/glass substrate have been carried out. The simulation was performed on the basis of a numerical solution of the heat equation in the Matlab program to determine the energy density of the laser radiation necessary for crystallization of TiO2. It was shown that on the surface of the TiO2 precursor the temperature reaches a maximum value at a time point of 133 ns with the Gaussian temporal form of the laser pulse. The optimum energy density for crystallization of the TiO2 precursor film with the nanosecond pulse duration is 1.3-1.6 J/cm2, when the film thickness temperature corresponds to 400-500 °C. The obtained results of the simulation are consistent with experimental studies.

Keywords: numerical simulation, laser heating, temperature distribution, TiO2 film, solar cell

Numerical solution to the problem of heat transfer in boundary layers transparent Strip on the walls, exposed on the opposite side of the radiant-convective heating. Study of influence of mode parameters on heat transfer process of tasks carried out in the case of the gradient flow and included the most typical variants of transportation processes. The purpose of the real work is studying of processes of transfer at non-linear boundary conditions, obtaining approximate and analytical decisions non-linear warm and a mass transfer, establishment of communication between regime parameters and physical interpretation of results of a research. Also some conjugate problems of heat exchange in the presence of radiation are studied. The analysis received decisions is carried out. The executed research allowed to establish that existence of a transversal overflow of heat in a wall and also the radiation of a surface have significant effect on the nature of distribution of the surface temperatures.

Keywords: boundary layer, convection, radiation, gradient flow, conjugate heat transfer

In this article, the actual task of automating the working processes for the design of offshore oil and gas facilities is considered. Developed software packages are provided that allow to provide higher quality of work, to shorten the development time due to automation of routine operations and the process of obtaining output documentation, as well as its operative updating and reissue when making changes.

Keywords: Bentley MicroStation, 3D modeling, offshore oil and gas facilities, design.

The paper is considered modelling the process elaboration of a pit for high-rise building in the case of dense urban area. The research is analyzed stress strain state of soil with retaning wall. The authors are developed various design solutions of the retainig wall to decrease of displacement of the nodals in soil finite element model. According the results, it has selected rational design solution of retaining wall.

Keywords: dense urban areas, retaining wall, finite element method, stress-strain state, soil massif

In this paper, we describe three target distribution methods for vehicle group control. The purpose of the methods being developed is to increase the number of defenders who survived after the fight with the enemy. The first method introduces a priority system based on the distance to the robot, as well as the distance to the protected area. The second method is based on the application of the modified swarm particle method, and the third method is based on the evolutionary-genetic algorithm. To demonstrate the work of each method, software was developed in C # and Python. The performed simulation showed the effectiveness of each method developed. Sixty experiments were carried out, 3 parameters were evaluated in each experiment. The best results were achieved using a method based on the priority system.

Keywords: vehicle, group control, priority, target distribution, optimization, particle swarm optimization, evolutionary-genetic algorithm, heuristic method

The analysis of 11 image processing algorithms for microobjects recognition in the histological sections of the biotissue is carried out. It is shown that for images obtained with different microscopes and dyes, there is no one universal method of image processing. The choice of the algorithm depends to a large extent on the specific type of microscope. Considered algorithms give more reliable results for high-contrast images when using a confocal microscope.

Keywords: image processing, edge detection, biological microobjects, OpenCV, ImageJ, morphometric processing, matching

Numerical solution of the problem of heat transfer in the boundary layers of transparent gas wall, exposed on the opposite side of radiant-convective heating. The energy dissipation due to viscosity is negligible, the wall is thermally thin, and the physical properties of the medium do not depend on temperature. The aim of this work - finding the local heat transfer coefficients (Nusselt number) needed for the analysis of heat exchangers. When solving the problem of nonlinear transfer functions linearizing method is used, based on which numerical scheme for computer calculations was constructed. The intensity of the local heat transfer in the boundary layer is determined by the number Kx = Nux / Nux0, where the value Nusselt numbers refer to the conditions under consideration of the problem of heat exchange (Nux) and constant surface temperature (Nux0). From a physical point of view, non-dimensional parameter Kx is a measure of the intensity of heat transfer in the boundary layer on a nonisothermal surface compared to heat transfer when the wall temperature everywhere the same. The analysis of this research showed that in radiative-convective heating number Kx on the front edge of the plate takes the largest value of Kx ≈ 1,37 corresponding to a constant heat flux on the wall. It is also shown that the relative temperature of the incoming flow has a significant impact on the value of Kx. The effect of this setting is especially evident in the processes when dominated by the effect of radiation and related to the nonlinearity of the transfer processes. The analysis revealed the influence of basic parameters of heat transfer on the development of transport processes in the boundary layer by heating radiation and convection simultaneously.

Keywords: Boundary layer, convection, radiation, radiation-convection heating, high temperature gas invironment, linearizing function

Methods for conducting polarization measurements on electrodes made of 1X18H9T steel are considered. Anodic polarization curves of steel 1X18H9T were obtained in solutions of electrolytes without stirring and with stirring. Comparison of the obtained anodic polarization curves allowed to reveal the rational current densities for realization of technological processes of combined anodic and mechanical processing of this steel.

Keywords: polarization curves, electrolytes, 1X18H9T steel, combined treatment

The problem of filling vertices of an oriented graph is considered. It is assumed that the choice of vertices from which the filling will be made and their number are determined by us. The filling process is assumed to be discrete. The capacity of arcs and the capacity of vertices are integers. In this formulation, the problem can be considered as a model for the consideration of irrigation in closed irrigation networks, the delivery of goods through the network.

Keywords: oriented graph, irrigation system, graph capacity, logistic system, delivery of goods, filling of verti-ces of an oriented graph, network methods, transport task