The stationary heat conduction problem for radiation-heat shield of the reactor nuclear power plant based on domestic sources of heat was solved. We took into account the dependence of the thermal conductivity of the concrete on the temperature, which leads to nonlinear problem. The solution is performed using the finite element method in combination with the method of successive approximations. We used the simplex triangular elements. The problem was solved in axisymmetric formulation. As a design scheme we used a rigidly clamped at the base thick-walled cylinder. It was found that the inclusion of thermal conductivity depending on the temperature leads to a slight (2.5%) increase of temperature in core of the construction.

Keywords: thermal conductivity, finite element method, the steady-state temperature field, radiation-heat shield, thick-walled cylinders

Technology mechanical point-shock engraving on photo printer for printing on products is particularly popular among specialists designers because the entire process of creating images and computer training to the engraving is very creative and at the same time allows you to make adjustments to the customer at any stage without much effort or loss of quality and time. To solve this problem it is necessary to analyze the causes of the marriage; determine the types of marriage by using technology of printing on the surface of the product mechanical point-impact photo printer and suggest methods to eliminate it.

Keywords: marriage, photo printer, dot-impact engraving, image distortion parameters blanks

The article provides an overview of different technologies for applying images onto a flat surface of the workpiece mechanical dot-impact photo printer on the basis of practical experience, reasons for marriage and remedies, types of material.point-impact photo printer and suggest methods to eliminate it.

Keywords: workflow, photo printer, a dot-impact engraving, image distortion parameters blanks

This article is devoted to description of structure of methodology of modelling of hierarchical problem-directed systems on the example of social and economic systems. In the basis of methodology the principle of a combination of the formalized methods of modelling and expert procedures is put. Modelling of hierarchical system is offered to be spent by means of multilayered fuzzy cognitive maps. Filling of the block of logical-mathematical models in structure of process of decision-making is described in detail. The offered methodology provides the development and choice of well-founded administrative decisions.

Keywords: Problem-directed system, decision making, fuzzy cognitive model, methodology

The article is devoted to modelling of process of decision-making in difficult systems in the conditions of total uncertainty. The problem is formulated on the basis of synthesis of concepts of the control theory and decision-making, the theory of fuzzy sets and the fuzzy logic, the theory of hierarchical multilevel systems, the utility theory and the theory of games. The given concept expands possibilities of the account uncertainty the various nature, typical to mathematical description of the surrounding validity. Problems of search of decisions in an fuzzy hierarchical control system are designated. The way of the description and finding of alternative decisions in multilevel difficult systems is offered in given article. The algorithm is based on information processing in the form of fuzzy intervals taking into account two kinds the politician conservative and aggressive on the basis of criteria «maxmin» and «minmax». The method of projection on individual interval is used for comparison of the fuzzy intervals presented on various dimension scales. The example showing work of algorithm of a choice of two groups of alternatives is resulted: optimistic and pessimistic on a level of hierarchies of the purposes in the conditions of total uncertainty.

Keywords: Difficult system; decision making, fuzzy interval, the control decision; total uncertainty

A stability problem of milling process is under consideration. A novel analytical tool is presented to assess the optimal cutting parameters which provide a chatter free machining. Chatter instability is broadly studied in the literature. However, the problem of simultaneous optimization of radial and axial depths of cut is kept out of scope. To describe the optimization method a single-degree-of-freedom model of milling process is investigated as well as corresponding equation of motion and function of cutting force. A unified delay-differential equation is proposed. A theorem of asymptotic stability is suggested. Suggested optimization technique allows to create a diagram of radial and axial depth-of-cut dependence.  As shown, there exists an extremum of function of axial and radial depth-of-cut dependence.  

Keywords: chatter, stability, delay-differential equation, oscilations, self-excited vibrations, optimization

The problem of temperature stresses in revetments of concrete plates taking in the account various conditions of temperature impact is considered. Contact conditions for various friction coefficient are considered. The simulation is made using finite element method in Ansys © software. The examples of exact simulations for stress fields are given for different parameters of problem

Keywords: temperature stresses, concrete plate, finite element method

We consider the relevance, peculiarities and the main stages of composite developments in the technology of production of finishing materials based on glass and ceramics. The description of technology of production of universal fragments, making the block-transformer. As basic materials for the development of applied chamotte ceramics and glass sheet.

Keywords: composite development, design, manufacturing technology, unit transformer, fireclay, glass

Results of research the ties of refrectory oxide, which form in the course of filling with stainless steels, and specific point defects impairing casts of stainless steel.

Keywords: quartz mould, chromium steel, oxides, chemical analysis, physicochemical interaction

In work infinitesimal bendings surfaces of positive curvature with edge, subordinates on edge of external communication of the mixed type are studied. It is established quasicorrectness such external communication provided that the vector field belongs to a surface

Keywords: a surface of positive curvature, infinitesimal bendings, a field of displacement, a field of rotations, own vector field, modelling problem

The article is devoted to the resistance accounts composite structures. It is based on all-covariance-energy principle. We consider the calculation of the stress-strain state of construction, consisting of a base in the form of hexagonal plates, rigid base related to the circular cylindrical shell.

Keywords: plate, shell, variation-energy principle, the strength, the composite structure.

The article is devoted to the resistance accounts composite structures. The basis of the position of women variational energy principle. Considered potential energy flanging to calculate the stress-strain state of construction, consisting of a base of the form of hexagonal plates, rigidly connected to the base of circular cylindrical shells, the upper end of which is enhanced by the hexagonal crimping.

Keywords: plate, shell, variation-energy principle, the strength, the composite structure

The article is devoted to the resistance accounts composite structures. We consider the output resolution of the system of equations for determining the stress-strain state of construction, consisting of a base in the form of hexagonal plates, rigidly connected to the base of a circular cylindrical shell.

Keywords: plate, shell, the strength, the composite structure.

The article is devoted to the resistance accounts composite structures. Examine the work of the external forces acting on the structure, consisting of a base in the form of hexagonal plates, rigidly connected to the base of a circular cylindrical shell.

Keywords: plate, shell, the strength, the composite structure.

The article is dedicated to increasing the strength properties of building structures based on bionic principles. Used research on modeling of plant materials. The different types of window openings. The recommendations to improve the strength of the restoration works for the construction of openings.

Keywords: shell, strength, mesh structure