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scientific edition of Bauman MSTU

SCIENCE & EDUCATION

Bauman Moscow State Technical University.   El № FS 77 - 48211.   ISSN 1994-0408

Science and Education

Subsections:

Definition of Tension and Travel in Covering Details on Cylindrical Surfaces with Small Gap (if Details with Hole Are Considered Boundless).
# 06, June 2011
D.S. Blinov, V.F. Alyoshin
The methods of definition of contact pressure affecting the hole of covering details were described in the previous article. The research was held in accordance with the theory of elasticity’s flat deformation problem. The dependencies obtained can be used to calculate tensions, travels and deformations in covering details. Several graphs for calculations of the late parameters were built.
Estimation of query excution time
# 06, June 2011
V.L. Pluzhnikov
This article analyzes existing architectures of parallel database systems. The process of query execution in parallel database systems is reviewed in details. Laplas-Stiltes transform is produced for time of query execution in parallel database systems. Properties of Laplas-Stiltes transform are used for deriving of averages of distribution of query execution time for different parallel database systems architectures. Practical example of query execution time computation for SE, SD and SN architectures is shown. Dependence of query execution time from number of processors in defined architecture is analyzed and corresponding conclusions are made.
Present-day technologies of high-performance computing in modeling of detailed mechanism for catalytic olefin hydroalumination reaction
# 06, June 2011
I.M. Gubaidullin, K.F. Koledina, Yu.B. Lind
To investigate mechanisms of complex chemical reactions an experiment for detailed particular reactions is conducted. This causes complexity in kinetic parameters estimation – the same set of rate constants ought to describe both particular and general schemas for the reaction. In this paper solution of this problem for olefin hydroalumination reaction is presented. To optimize the computational process a methodology of paralleling has been proposed. On its base a kinetic model for the reaction has been constructed and physical-chemical conclusions on its mechanism have been made. The character of breakdown time for olefin hydroalumination reaction with diisobutylaluminium chloride has been estimated.
Digital asset in the system of production management
# 06, June 2011
M.F. Menyaev
Technique is considered the application of the digital asset management system on manufacture, allows to increase the efficiency of production due to the application of the digital code of technological information in the course of the additional issue but the products. Examines the concept of the lifetime of the order for the product. Shows the changes in the structure of the production process when using the digital asset management system. The conclusion is that the effectiveness of the development and application of digital assets allows to reduce time for the preparation of additional orders, carry out preparation of the operational, personalized and small series of products without attraction of additional resources for the development of technological operations, improve reliability and reduce the time the search for the desired information.
Analysis of constructive and technological parameters of device for rotary band grinding on the basis of examination of dynamics of relative motion of abrasive belt
# 06, June 2011
S.A. Shiliaev, A.G. Ivanov
Quality of the surface layer is a result of the impact of a cutting tool on work material while cutting. The work presents the conclusion of analytic dependencies of relative motion of an abrasive belt of a device for rotary band grinding which enable to establish the criteria and boundary values of operating mode of the device under which stable OS are observed, their frequency and amplitude being established as well. The results of study offer and explain rational constructive parameters of device and processing modes with the device for rotary band grinding
Dynamic system attainability domain boundaries construction via composition of multiple integration and vector field approximation approaches
# 05, May 2011
DOI: 10.7463/0511.0185335
D.S. Kulesh, A.P. Karpenko, V.A. Fedin
Dynamic system attainability domain approximate construction problem is considered. We studyefficiency of using composition of multiple integration approach and vector field approximation of model differential equations system for solution of this problem. We present description of specified methods and their tests on application of approximate construction of attainability domain of aircraft, described by model. For given research we reach a conclusion about usability condition of approach composition involved.
Test quality monitoring of training quality and quality criteria of educational tests. The review
# 04, April 2011
DOI: 10.7463/0411.0184741
A.P. Karpenko, A.S. Domnikov, V.V. Belous
The paper presents the general questions connected with a test quality monitoring of quality of training, and also various ways of classification of tests and test tasks. We present the review of the basic criteria for estimation of tests reliability, validity, difficulty and so on. A number of the validity measures of tests is offered. These measures are based on the knowledge of a subject domain of studied discipline in the form of a semantic network.
Information flows in the system of management of industrial enterprise
# 05, May 2011
M.F. Menyaev
For the effective use of business information, formed on the basis of the information-information technologies, the system of management is organized information resource, defining interaction of internal and external information, as well as the methods, technologies and means of search, processing and distribution information for managerial decision- making. Its active use allows to get additional advantages in the management of the organization in the direction of organization of technological processes, increase the property, the search for and development of new technological solutions, virtualization management of manufacturing processes. Also processing the operative information on each stage of the management of manufacturing processes to determine the optimum amount of adding the cost of the product, can contribute to the generation of new technological knowledge, allowing to let out a new product, to form a corresponding segment of the market, reduce production and commercial risks and to receive additional profit.
Development of parallel algorithm for obtaining initial basic feasible solution of a transportation problem
# 05, May 2011
A.A. Al-khulaidi
This paper describes a parallel algorithm for finding the basic feasible solution of the transportation problem, developed on the basis of the Vogel’s approximation method (VAM). Effectiveness of the proposed algorithm was proved by experiment.
Expediency and directions of formation of a complex of marketing at realization of the high technology project of creation of the industrial equipment
# 04, April 2011
V.J. Moshchelkova
The role of tools of marketing in the high technology design management and directions of their perfection are analysed in this article. The complex of recommendations is offered to manufacturers of the high technology industrial equipment. It includes the recommendations for realization of commodity policy in view of specificity of stages of creation of the industrial equipment and formation of requirements to its development; for a choice of a method and model of formation of the price of the high technology industrial equipment at various stages of life cycle of the project; for realization of marketing policy of the manufacturer depending on a degree of readiness of the equipment - a product of the project. Besides the algorithm of development of communication policy of the manufacturer is offered. The application of this algorithm allows to consider a degree of readiness of the industrial equipment at stages of life cycle of the project and to choose optimum means and directions of promotion of the equipment in the market.
The use of "trees" search states to support decision making in complex operational estimation systems on board spacecraft
# 05, May 2011
H.V. Sarkisyan, M.M. Matyushin
Any on-board system is a complex technical system, and its analysis requires special mathematical methods. The number of parameters describing the state of the spacecraft, there are tens of thousands. Each such parameter characterizes the state of node, block, unit, subsystem of any on-board system, or any aspect of the operation of this site, the block unit. To estimate the state of the spacecraft and support decision –making requires an estimate of the set of parameters describing the state of this spacecraft. One of the approaches that allow facilitates the process of search for a solution to a group of flight control of spacecraft is presented in this article. This method is the use of "trees" search condition. This approach allows us to optimize the process of analysis of the systems on board. Also, the use of "trees" search state allows you to automate the analysis process and implement its program, organizational, hardware.
Slot Width Controlling for Filter Structure Produced by Deformational Cutting
# 05, May 2011
N.N. Zoubkov, A.D. Sleptsov
The article presents the main principles of through-wall slot width controlling for polymer filtering tubes produced by deformational cutting technology. Dependence of the machining parameters on slot width at the beginning and the end of slotting was determined. Authors proposed the  technique providing the slot width uniformity along the filter tube. This technique is based on changing the axial feed value when machining the beginning and the end of slotting. Experimental researches proved this method. Slot width variance along the slot for adjustable filter tubes with helical through-wall slot rows was described and proved experimentally. The main factor influencing on slot width variance is inclination  angle of helical slot rows.
Modeling of mechanical linkages. Contractibility conditions
# 05, May 2011
A.N. Bojko
We consider a model describing the positional  mechanical connections of products. This model is a hypergraph. Necessary conditions for the existence of the sequence of contractions, transforming the original hypergraph in unimodal discrete state, are proved. These conditions can be used for verification of projects in the early stages of design and construction. It is shown that the violation of a linear relationship between vertices and edges of the hypergraph leads to intractable dimensional chains and the emergence of excess bases. We find all the nonisomorphic noncontractible  hypergraphs of fourth order, which remain valid for the necessary conditions
Between coordinates ties in theory of vibroprotection
# 04, April 2011
S.V. Eliseev, Yu.V Ermoshenko, R.S. Bolshakov
Methodical bases for building of transport mathematical models  vibroprotection systems are suggested. Considered systems have lever mechanisms and additional ties, which can be realized through using of elementary typical links of widen collection.
The procedure of a typical hotel complex services ranging on the basis of personal requirements ranks for hospitality sphere
# 05, May 2011
V.B. Demurin
The article contains the results of personal requirements expert ranging for hospitality sphere and model of a typical hotel complex which describes dependence of services set from requirements and personal activities. The procedure of services ranging on the basis of personal requirements ranks is proposed. There are also numerical values of services ranks for main purposes of accommodation: rest, treatment and business trip. The results of the procedure are the basis for implementing the method of intellectual selection of a hotel room and can also simplify the process of selecting a services set, corresponding to the desired number.
Definition of the Distribution Diagram of Contact Pressure in the Connections of Details on Cylindrical Surfaces with Small Gap (if Details with Hole Are Considered Boundless).
# 05, May 2011
D.S. Blinov, V.F. Alyoshin
The lack of reliable and comfortable methods of engineering calculations of connections of the details on cylindrical surfaces with accounting of radial gap, that is somewhat of a key component in such calculation, is becoming more and more obvious. The following group of articles has to improve this situation. The calculation can generally be divided into three parts in accordance with rigidity of the detail with hole. This article is dedicated to the development of methods of engineering calculations of connections of the details on cylindrical surfaces with small gap, that can be considered as boundless in radial direction
Сoncept graph as the basis for student knowledge model
# 05, May 2011
I.A. Girya
Adaptive technology in designing computerized educational systems is one of the major tendencies today. Student model here is the main component, on which adaptive course control is based. The paper is focused on a proposed approach to designing student knowledge model based on an expandable graph of concepts. The graph presents educational concepts and terms in a form of hierarchy. Each node is connected to related objects of computerized teaching system (e.g. chapters, pages, quizzes etc.). Thus, the system is able to track student’s level of knowledge of concepts from graph, node by node.  The proposed principle can be used to design  competence-oriented model of specialist knowledge.
Modification of gears with an overlapping coefficient more than two
# 05, May 2011
D.V. Dorofeev, I.V. Shevchenko
Gearings with contact ratio big 2 have some advantages in comparison with standard straight-toothed transfers: high flexural and contact strength, low vibrations and small dynamic loads. At their projection there are some problems - jam origination, high contact loadings on crimps of teeths, heightened speeds of a slip, a heightened heat release. For elimination of these problems it is offered to use modification of a line of a structure of teeths. The article presents results of comparison of various kinds of the profile modification applied to steams of aviation toothed wheels: with contact ratio big 2, and also with contact ratio equal 1.5. Comparison was conducted for the gears applied in aircraft.
System modeling of information processes of industrial organization
# 05, May 2011
M.F. Menyaev
System model of the organization of the information resource lets show the interaction of the main information flows in the management system and to identify the main elements required for control of information space of production. Depending on the level of use of information technologies it is possible to allocate two basic levels of forming the system of information management. The first level will make decisions implemented on the basis of the operational database. The second level is determined by the solutions implemented on the basis of the local network of the organization.
System analysis and reengineering of legacy program systems
# 04, April 2011
L.V. Massel, D.V. Podcamenny
The article describes method of legacy program  systems analysis  which is proposed by authors on the base of legacy systems reengineering experience in the field of energetic. Estimates of module stability, algorithm of  module stability degree identification and module concatenation are considered. There are described method of legacy systems reengineering proposed by authors and expert system Expacy made for support of this method.Given in this article results  are  supported  by  RFBR  grants ╧ 10-07-00264, ╧ 11-07-00192 and by RAS Presidium Program grant ╧2.29.
 
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