Mechanical engineering and machine science
The main advantage of the technology of electroerosion dispersion is the use of waste as raw materials, which is much cheaper than the clean components used in traditional technologies. In addition, this technology is powder, which allows powder-alloys.
The widespread use of the method of electroerosion dispersion for the processing of metal waste into powders for their reuse and application in additive technologies is constrained by the lack of scientific and technical literature full information on the effect of the initial composition, modes and medium on the properties of powders and technologies of practical application. Therefore, the development of technologies for the reuse of electroerosion powders and evaluation of the effectiveness of their use requires complex theoretical and experimental studies.
The aim of this work was to carry out x-ray diffraction analysis of the additive products of electrical discharge machining of cobalt powders.
For the proposed studies selected waste cobalt alloy brand CHMS "CELLET". Butyl alcohol (butanol-1) was used as a working liquid. To obtain the cobalt powders used for the installation of AED dielectric materials. Dispersion parameters: voltage 100 V, capacity 48 UF, pulse repetition rate 120 Hz.
The phase composition of the samples was studied by x-ray diffraction using Rigaku Ultima IV diffractometer in Cu-Ka radiation (wavelength λ = 0.154178 nm) using Soller slots.
According to the results of studies of x-ray diffraction analysis of additive products obtained from powders made by electroerosion dispersion of cobalt-chromium waste, it was experimentally established that the main phases in sintered samples are Co, Cr and Co3C.
The concept of rating dynamic statesis proposed in mechanical oscillatory systems created by the interactions of articulated elements. It is assumed that in real constructive solutions elastic, dissipative and mass-inertial elements are not always connected by kinematic pairs providing retaining or two-sided ties. Such situations are typical for many transport and technological vibration machines. The purpose of the article is to develop and detail a method for constructing mathematical models of the interaction of typical elements (or links) of mechanical oscillatory systems in order to determine the resulting coupling reactions in dynamic compounds. Methods of achieving the goal are based on the use of technology and methods of structural mathematical modeling, when the equivalent automatic control system is compared in a dynamic relation. A technology has been developed for the transformation of structural models, which allows for characteristic contact points to form dynamic coupling reactions, as the product of the system’s dynamic stiffness at a certain point and its dynamic displacement. The concepts of transfer functions of systems are used. It is shown that dynamic reactions at certain points of the system are fractional rational expressions, the values of which can vary widely depending on the frequencies of the external disturbance. Zero values of the coupling reactions determine the regimes in which the “rupture” of the kinematic coupling is possible. In the presence or accounting of standing forces, the limiting state is reached under conditions that take into account the effect of an additional force factor. The authors propose the introduction of the concept of the relationship of dynamic reactions at various points in the system, which forms certain information spaces. Methods and techniques for estimating dynamic states in compounds of system elements in problems of estimating a possible spectrum of expected dynamic states are proposed.
The purpose of research in this work is to increase the wear resistance of friction surfaces of machine parts by implanting materials based on tungsten carbide, providing a modified surface layers with improved physical and mechanical properties in comparison with wear-resistant coatings obtained by traditional methods of processing.
The technology of implanting a combined Electromechanical treatment is implemented on a special installation, which is a technological complex consisting of: a universal machine (used for machining workpieces) with the appropriate tools and devices for fixing the workpiece and the supply of electric current of high power and low voltage; power unit for the conversion of industrial electric current; control unit processing modes; means of switching and supply of lubricating-cooling technological medium; unit interface with PC.
In the process of implanting tungsten carbide particles were introduced into the formed surface layer, reinforcing it. Then, on the same surface, Electromechanical treatment was carried out on the reinforcing modes.
It is experimentally established that in fact the surface layer of carbon steel 45 is a gradient structure similar to the structure of tool steel P18, and with a higher hardness as a consequence of the composite hardening of the released carbide phases of different morphology. The gradient structure is a cellular supercooled austenite stabilized by tungsten and reinforced with a carbide mesh consisting of aggregated highly dispersed (less than 1 µm) filamentous and rounded tungsten carbide particles. The presence of a gradient structure with a smooth transition to the main metal matrix of steel 45 provides monolithic adhesion of hardened layers that do not peel off from each other during wear.
In Kursk, the processing of navigation data is engaged in MUP " CDS Gor. Kursk", this company installs on vehicles navigation equipment of the following type: GalileoSky, Autograph-GSM, as well as Navigator with intercom Granite 2.07.
The introduction of transport monitoring technology helps to improve the quality of service. The expansion of the functionality of the terminal in transport is currently quite large and it is achieved through the installation of additional sensors. Large companies for the production of GLONASS / GPS equipment such as" Gurtam"," TC automation"," Autograph " and other in addition to navigation equipment are ready to provide dozens of sensors that complement the standard monitoring terminals and contribute to the improvement of transport.
The purpose of this work was the introduction of sensors of passenger traffic for passenger transport by road in Kursk.
The paper presents the current in the city of Kursk scheme of control over the movement of urban passenger transport. The prospects of development of the existing system of transport control are described. On the basis of activity of the enterprise MUP "CDS mountains. Kursk " presented navigation devices operated on urban passenger transport, and compared two types of sensors of passenger traffic, as well as the calculation of the cost of equipping the entire rolling stock of cars brand PAZ in the city of Kursk sensors of passenger traffic, describes their advantages and mechanisms for profit. the results of the calculation of the cost of transportation, proposed a new system of taxation based on the data of the sensors of passenger traffic, which will increase the flow of funds to the municipal budget, and the calculation of the payback period of the introduction of innovations.
CONSTRUCTION AND ARCHITECTURE
The relevant building codes don't contain methods of calculation of remaining life of reinforced concrete structures. The explanation is that developed methods don't allow to consider many factors concerned with durable exploitation of structural elements:changing loads occurs both in amount and mode and direction of the influence, technological impacts not foreseen by the project are possible, corrosive damages occur and accumulate, the initial deformation-strength properties of concrete and reinforcement are changed. To solve this problem it's important to test the structures, that suffered from real environment conditions.Development, approbation and inclusion of complex engineering methods of forecasting and methods of estimation of the residual life of reinforced concrete structures in normative documents is an actual scientific task facing the researchers in the field of construction.The creation of a modern practical methodology will increase constructive safety in the long-term operation of infrastructure facilities, and will provide an opportunity to more effective manage capital investments in the real estate market.The results of the experimental investigations of reinforced concrete beams of civil building external walls are given in the article. The deformation mode of the specimens until their rupture is described. Manufactuiring defects, exploitation corrosion damages and their influence on stress-strain condition of structures are presented. It is noted that in the manufacture of reinforced concrete structures it is necessary to increase the level of quality control of the manufacture of reinforcing frames and to ensure their project position when concreting.
For testing the methodology of cadastral appraisal of land selected sudza town, which is the representative among the small towns of the Kursk region. The main sources of land contamination in the city of Sudzha are industrial enterprises and vehicles.
We have conducted research of a condition of soils and aquatic systems by determining the content of heavy metals: cadmium, zinc, Nickel, lead and chromium.
As stated, this content in the water of the river Sudzha is different in different parts of the city that is above, centre and below the city. The most polluted with heavy metals is river water above the city. In the center, these figures are reduced, and below the city is rising again. This can be explained by the fact that in the city centre there are no industrial facilities, and discharge of polluted sewage in the river is above or below the city. In its surroundings agriculture: crop production, agriculture and garden-ohorodnie economy.
The concentration of heavy metals in soil on secondary streets is higher than on the main. Although it would seem that the main street subject to the greatest anthropogenic influence. The reason for this is that industries are not located in the city centre, and located on its periphery.
There is a significant accumulation of soil heavy metals in previous years. So the content of Nickel and lead in soil exceeds their accumulation during the winter in snow. However, the concentration of cadmium, zinc, chromium in the snow exceed its long-term contents in the soil.
In the end, during the spring flood, together with hoists waters, these contaminants are redistributed: a part of them remains in the soil, the other to migrate into groundwater or with surface runoff enters the river.
One of problems of transfer of the rainfall of sewage (OSV) is use of impeller pumps for these purposes. Now displacement pumps, in particular screw are used. Application of impeller pumps is limited due to the lack of rheological characteristics of flowed through environments in this connection impeller pumps apply in the main ambassador of a dilution of OSV water that leads to padding energy consumptions.
Definition of rheological characteristics of OSV will allow to recommend impeller pumps for their transfer and will define their opportunities.
It is for this purpose offered to use a method of a capillary viscosimetry for definition of rheological constants (the ultimate strain of shift and viscosity) which characterize OSV which current is described by model of viscoplastic liquid.
Definition of rheological constants of rainfall of sewage was carried out on production installation where performance characteristics of pumps with simultaneous definition of the OSV viscoplastic properties were removed.
Rheological constants OSV were defined by method of the accounting of hydraulic resistances on the fixed site of a round pipe depending on an expense of OSV and its concentration in the assumption that the current mode laminar.
It is established that unlike the Newtonian liquids all curve currents in a pipe depending on its concentration pass not through an origin of coordinates, and intercept that indicates the OSV viscoplastic properties. Driving begins to happen only after when pressure in a pipe is more than pressure of the ultimate strain of shift.
The research of rheological behavior of OSV showed that the main characteristics of the studied OSV are the ultimate strain of shift and plastic viscosity which depend on concentration of suspension.
Results of an experiment show that change of rheological characteristics of OSV depending on concentration depends on change of characteristics of pumps and corresponds to the existing recommendations about transfer of OSV pumps without watering.
Dependence between rheological characteristics of rainfall of sewage and their concentration is established.
This article substantiates the significance of the development of construction for the lives of people and the state as a whole. The situation in the construction sector of Russia is considered, the need for its intensive development is substantiated and the main problems are highlighted: high degree of monopolization of the real estate market, outdated technologies and inefficient design solutions, strong dependence on the administration, lack of motivation of local governments in the development of construction. Particularly urgent is the problem of broad construction of social housing, taking into account the climatic conditions and the level of incomes of citizens. Given the enormous resource potential of Russia, the latter task does not seem insoluble.
To solve these problems, the experience of states that have won leadership positions in the industry is suggested. On this basis, it will be rational to create an individual national approach for the development of construction in Russia, taking into account resource, economic, technological, climatic and legal features. The work takes into account the pace of development of the construction of the Group of Seven countries, the United States, as well as new leaders in the construction industry (India, Brazil, China), the reasons for such a rapid growth in their construction sector, and forecasts for their further development.
The methods of construction in such countries as China, the United States, Japan, Turkey, India, the United Kingdom, the EU countries have been studied, common features have been revealed: improvement of design decisions, determination of reliable project cost, application of modern technologies, energy saving, reduction of construction time, distribution of "green"construction, increasing the energy efficiency of structures, etc. Finally, concrete steps of the RF legislation aimed at improving the construction are reflected.
Computer science, computer engineering and IT managment
Spatial data processing typically involves data collection, storage and maintenance, analysis, and output. The introduction of modern technologies has led to increased use of computers and information technology in all aspects of spatial data processing. The software technology used in this area is a geographic information system. Geographic information systems are used by various disciplines as tools for spatial data processing in a geographic environment.
Currently, the determining role in the Arsenal of automated information systems is occupied by geoinformation systems based on the use of the latest geoinformation technologies and remote sensing data and considered in the adopted concepts of the development of new types of science-intensive technologies as priority system-forming elements of infrastructure.
One of the priority directions of development of information and communication technologies in the long term is the formation of modern information and telecommunication infrastructure, automated information systems, geographic information systems and geoinformation technologies, and the provision on their basis of quality innovative services and products that ensure the effective development of industry and the economy of the country's regions.
At the same time, the creation and implementation of geoinformation systems as innovative elements of automated information systems into the work of government bodies, enterprises of industry, takes place against the background of the complicating action of scientific, technical and economic factors and trends.
In the constantly developing information infrastructure there is a clear trend in the intensification of the use of geospatial components, there is a growing equipment of most elements of automated information systems with a new type of information support – geospatial information.
An important result of the spread of geoinformation technologies is their penetration into many areas of social and political life, including the sphere of science, production, management of the country's economy.
The article reveals the questions of mathematical formalization and algorithmic implementation of economic dynamics. To develop a computer model of sectoral development of the Russian economy, an agent-based approach was chosen, allowing to evaluate the result of control actions as a set of reactions to them of individuals and organizations.
At present, in the practice of managing social and economic systems of various levels, new methods are needed to assess the impact of monetary, investment, tax and social policies on social stability and economic security of the country. The diversity and stochastic nature of the factors influencing the sectoral development of the Russian economy necessitated an interdisciplinary study combining agent-based simulation modeling, socio-economic analysis, methods of artificial intelligence and cognitive psychology. In the context of developing a computer model of the Russian economy, the aggregate of changes in final, intermediate and investment demand in the economy and the market response in the form of changes in the output of individual organizations, increasing or decreasing the need for personnel, financial resources and equipment are considered as mechanisms for implementing the processes of economic dynamics.
Manageable parameters of the computer model are measures for the implementation of sectoral and regional development programs, introduction of tax incentives for developing industries, etc. The model provides assessment of the impact of managerial decisions on the economic system; in particular, when analyzing various variants of sectoral programs, it is possible to compare their influence on the structure of exports - imports and assess the import-substituting effect. The proposed approach has significant differences from the currently used mathematical and software models of the economy and provides the ability to predict non-equilibrium economic systems in the long term.
One of the essential conditions for creating the bearing capacity of the lubricating layer in thin channels with moving relative to each other forming surfaces is the presence of a geometric or viscous wedge. In this paper, the authors propose a method of creating additional bearing capacity due to the so-called artificial temperature wedge. The paper presents a mathematical model of non-isothermal flow of a viscous fluid in the confuser channel formed by two non-axial cylinders, taking into account the multi-zone method of supplying a lubricant of non-uniform temperature. The developed mathematical model is based on the generalized Reynolds equation and the equation of convective heat conduction written in bicilindrical coordinates, which greatly simplifies the definition of boundary conditions. The validity of using the Reynolds equation is confirmed by an analysis of the terms of the Navier-Stokes equation in the considered range of values of geometric, kinematic and static factors. The mathematical model is numerically implemented using the finite-difference method, and the developed calculation program is a kind of practical tool for calculating the distributed and integral characteristics of the objects in question as applied to fluid-friction bearings and hydrodynamic gap seals. In particular, this paper shows the effectiveness of creating an artificial temperature wedge due to a multi-zone supply of a non-uniform temperature lubricant. Based on the computational experiment, the temperature conditions for the lubricant supply are determined, which allow to increase the bearing capacity by an average of 20%, while the friction coefficient decreases by 16% for the object in question as applied to the bearings of the friction of the laboratory rotor-support unit.
The article considers the application of the network programming method to the solution of the discrete problem of minimizing the cost of the project for a given duration of its implementation. The essence of the method is that the target function and the restriction in the scheduling problem can be represented as a superposition of simpler functions. This representation is convenient to depict in the form of a network, at the lower level of which there are vertices corresponding to variables (network inputs), intermediate vertices correspond to the functions included in the superposition, and the final vertex (output) corresponds to the original function.
Calendar planning tasks are very common in practice and at the same time belong to the class of NP-difficult. This makes the development of algorithms for their solution actual. The paper describes two basic algorithms for solving the problem for the cases of independent and sequential works. More complex cases (tree-type network and an aggregated network) can be represented as a combination of these cases and solved based on sequential application of basic algorithms. As an example of a production network is given a network of the type "Assembly with a components". For it the method which consists in definition of a set of works which fixing of duration leads to one of the cases considered above (tree-type network or aggregated network) is offered. Next all possible options for fixing the duration of the work of the selected set and the solution of the problem for each option are considered. The best of all the options is chosen.
The algorithms proposed in paper may be useful in the of the project management, particularly in solving scheduling tasks.
This work addresses the problem of creating the simulation models of a graphical multiprocessor for carrying out computational experiments to determine the efficiency of using the parallel computing based on GPGPU (General-purpose computing for graphics processing units, non-specialized computing on graphics processors) in tasks of structural-parametric synthesis of big discrete systems based on evolutionary procedures. We propose to use the Petri netstheory as a mathematical tool.It has the parallelism property and allows describing discrete processes occurring both in the genetic algorithm and in the computing system itself.The development of a simulation model is carried out on the basis of the graphic multiprocessor module memory architecture taking into account the specifics of its work related to the ability to read, write and transmit data.In addition, we describe the feature of the arithmetic logic devices work, which are able to simultaneously execute one command over a set of data.When building the model we take into account a feature of graphic multiprocessors which allows to get a greater effect from usingthe parallel computing avoiding the branching and control blocks operation that slow down the multiprocessor (since their number is less than the calculators number), thereby forming the “narrow” places.The proposed simulation model of a multiprocessor unit based on the selected tool is implemented using the specialized software for simulation based on the Petri nets theory – PIPE 5.This software is distributed free of charge and has a wide range of instrumental and analytical tools, which greatly simplifies both the modeling process and the process of analyzing the obtainedmodels.The resulting model will provide an opportunity to evaluate the efficiency of using parallel computing based on GPGPU technology in solving the task of improving the performance of intelligent information decision support systems based on genetic algorithms adapted to the subject area.
ISSN 2686-6757 (Online)