05.00.00 Technical science
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Description
At the nodes of the various machines, we use plain bimetal bearings: a steel base - antifriction cladding layer. Bimetal bearings have increased performance. One of the ways of making such bearings is the way of centrifugal bimetallization with heating of the independent electric arc. An important requirement of this technology is a uniform heating of the workpiece along the entire length until the formation of a continuous layer of the molten cladding material. The process of bimetallization require temperature control, since within the movement of the electric arc, low heat or high heat are possible due to heat dissipation from the ends of the workpiece in the installation and from the outer surface of the workpiece to the environment. A viable option the temperature control of the heat process of bimetallization for industrial conditions is to control the temperature of the outer surface of the steel base. It is necessary to solve the heat problem of the relationship between the temperature on the surface of the workpiece with the temperature on the boundary layers. For this purpose the numerical solution of the mathematical model of the thermal process, which includes the heat transmitting equation of Fourier and heat transfer at the ends of the sleeve according to Newton's law. The equivalent coefficients of heat transfer are obtained based on calculated and experimental thermograms. This is a time-consuming work. To minimize the time of fixing the boundary value problem of the thermal process of bimetallization, in this work we present the preliminary modeling based on the analytical solution of the thermal task of bi-metallization
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Description
The technique relates to the area of distribution of key information in cryptographic communication systems. The purpose of the work was to solve the problem of increasing the speed of distribution of key information for special bodies of federal bodies of critical facilities in the conditions of network-centric management and creating alternative options for the distribution of key information when key documents are compromised to special equipment. By applying the methodology, a solution to this problem is achieved by applying a key distribution method based on asymmetric cryptography using symmetric polynomials
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Description
The article formulates and solves the task of discrete control in the thermophilic stage of the composting process. It is shown that considering the relay control entity to maintain specified process conditions requires the organization of the sliding mode. We have solved the problem of minimizing the temperature deviation of the substrate from the set values and the deviation of the oxygen concentration in the gas phase of the bioreactor from the specified values. The article shows the algorithm to compute the discrete control of the composting process in the thermophilic stage. This work was prepared in the framework of the scientific project 16-48-230441 a(R) "Mathematical modeling of the processes occurring in the automated installation for year-round production of organic fertilizers in the conditions of the Krasnodar region", financed by RFBR and the administration of the Krasnodar region
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SOURCES OF ELECTRICAL ENERGY OF AIRCRAFT ELECTRIC POWER SUPPLY SYSTEMS: CONDITION AND PERSPECTIVES
DescriptionAccording to its operating principles, generators of aircraft electric power supply systems do not differ from the similar generators of transporting and stationary systems, but have range of peculiarities: low weight and dimensions, high density of armature current, compulsory cooling (air and liquid), high frequency of rotor spinning. The article considers main requirements, imposed to generators of flight vehicle and the construction peculiarities and main physical and operational characteristics of generators applied in modern flight vehicles. It is suggested to use noncontact electrical machines as sources of electrical energy in the aircraft electric power supply systems: synchronous generators with impulses from permanent magnets and asynchronous generators with capacitive impulse. To improve physical and operational characteristics of generators and aircraft electric power supply systems it is suggested to refuse from permanent frequency spinning drivers which have low converters as stabilizer of voltage and frequency current of electrical energy source. The peculiarities of its operation are considered, its advantages and disadvantages. It is possible to improve characteristics of aircraft electric power supply systems by means of study of the electromagnetic compatibility of the main functional system elements and by means of application of non-contact electrical devices, applied in the guard and control systems, made on the basis of power and electronic devices
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THE FINISHING CLEANUP AND STRENGTHENING PROCESSING OF AGRICULTURAL PURPOSE CARS DETAILS
DescriptionResults of engineering and scientific search of improvement of resource-saving machine technologies of finishing and cleanup processing of cars details, development of new camps and technologies are presented. The possibility of low-frequency fluctuations with big amplitude can be implemented due to assembling flat or curvilinear elements on external surfaces of the relative screw reel. The use of computer modeling enabled us to obtain a relative screw drum that provides not only giving movement to loading masses with a big fluctuations amplitude, but also compression of loading masses in the process of their motion from loading to unloading. In such machines increase in processing efficiency is reached not only due to achievement of great movement amplitudes values of the loading masses, but also at the cost of compression of loading masses in processing and intensity increase of their mixing. The scheme of the machine for continuous processing with mechanization of separation of details from working environments particles is provided. Results of researches of quality and surfaces micro hardness change processed in the offered machines designs show that details processing time makes 3-6 min
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SOLUTION OF THE OPTIMIZATION PROBLEM FOR ELASTIC-DAMPING MECHANISM PARAMETERS IN PLOWING MODE
DescriptionThe article is devoted to finding of the optimum parameters for elastically damping mechanism (EDM) which is located in transmission of machine-tractor unit (MTU). The investigated MTU is based on the tractor of 1.4 class in plowing mode. EDM is designed for MTU in order to make its’ start smoothly, to reduce the dynamic load in transmission, to protect engine from the external load vibration. The “transmittance level” (index T) is used as evaluation of the protective mechanism quality. The study was carried out by means of the experiment planning method, viz. the central composition plan of second order with five factors. A regression model for response function (“transmittance level”) is given. This model takes into account the chosen EDM characteristics. The statistical analysis methods (Student’s t-test, Fisher’s test) were used to study the regression model. The dependence of response function on each factor apart, their cross impact on the process are described. The system of partial differential equations is obtained to find the optimal values of parameters and response function. The optimal value of a “transmittance level” can be obtained by varying different EDM parameter values. Optimal values of parameters and as result - response function - allow improving of MTU functioning in plowing mode
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Description
The article is devoted to the analysis of the use of large data processing technology in information systems of territorially distributed complexes
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Description
The problem of availability and quality of medical care is a priority nowadays. The Medical Centres for Information and Analysis (MCIA) have been created in the regions for the purpose of gathering information about the quality of services rendered and subsequent data are transferred to the Ministry of Health Care of Russia. Regional MCIA are complex and developed systems that solve simultaneously many problems, one of which – the organization of collection, processing, recording and analysis of information on the provision of medicines. It has been established in the course of conducting an analytical review of examination systems of preferential recipes and information protection that the level of automation of routine operations of the MCIA activity of the Krasnodar Region is high, but there is no qualitative information processing. As a result of the comparative analysis it was determined that the automated review of medical prescriptions for privileged drugs allows identifying abnormalities in the reference data without any analytical conclusions about the causes and consequences of the case. Taking into account the fact that in the provision of essential medications there still exists quite understandable demand for software products which automize the routine work of specialists, it remains obvious that the directions of improvement of software products are not implemented fully. In this regard, the present research proposes measures to improve the existing systems by integrating with the information system of medical and economic control of the prescription of medicines
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OPTIMIZATION OF PARAMETERS OF ELEMENTS COMPUTER SYSTEM
DescriptionThe work is devoted to the topical issue of increasing the productivity of computers. It has an experimental character. Therefore, the description of a number of the carried-out tests and the analysis of their results is offered. Previously basic characteristics of modules of the computer for the regular mode of functioning are provided in the article. Further the technique of regulating their parameters in the course of experiment is described. Thus the special attention is paid to observing the necessary thermal mode in order to avoid an undesirable overheat of the central processor. Also, operability of system in the conditions of the increased energy consumption is checked. The most responsible moment thus is regulating the central processor. As a result of the test its optimum tension, frequency and delays of data reading from memory are found. The analysis of stability of characteristics of the RAM, in particular, a condition of its tires in the course of experiment is made. As the executed tests took place within the standard range of characteristics of modules, and, therefore, the margin of safety put in the computer and capacity of system wasn't used, further experiments were made at extreme dispersal in the conditions of air cooling. The received results are also given in the offered article
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Description
An overview of various ways of preparing roses for industrial processing with the aim of obtaining rose essential oil is presented. Based on the patent and information retrieval data, features of new, scientific developments in this field, which have not yet found wide application in industrial processing, their advantages and disadvantages are discussed. The conclusion is made about the need to search for new, modern, environmentally safe ways of preparing raw essential oil for industrial processing