ISSN 0236-235X (P)
ISSN 2311-2735 (E)

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Higher Attestation Commission (VAK) - К1 quartile
Russian Science Citation Index (RSCI)

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2
Publication date:
16 June 2024

Articles of journal № 2 at 2014 year.

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Public date | Title | Authors

21. The method of quality factors estimation for radar detection [№2 за 2014 год]
Authors: Platonov A.Yu., Pomazuev O.N., Mironov A.M., Abu-Abed, F.N., Ryumshin A.R.
Visitors: 14483
Nowadays stealth technologies are widely used. That is why the radiated radar -tracking signal is essentially r e-flected and absorbed. Thus, the power of a reflected signal on an intake radar entry is decreased. It complicates airplane d e-tection, or other object creat ed according to similar technology. Under these conditions it is difficult to estimate quality fa c-tors of radar detection of stealth and small targets. In many cases the radar signals amplitude and a phase is unknown parametres. The models of signals are u sed often when there are fast (in relation to clock frequency) fluctuations amplitude signals and a phase when there is no possibility to es ti-mate their values according to the results of preliminary statistical estimation on the previous intervals. We propose a technique which allows determining the quality of radar detection for a wide class of models of signals (i n-cluding stealth and small targets) in terms of stationary Gaussian noise, impulse noise and in non -jamming environment. The technique uses the obtained analytical expressions and approximation of distributions with Gram–Charlier series in Edge-worth Expansion. Detection threshold for given probabilities of false alarm is defined by Newton's method. It improves the accuracy and simplifies the calculations. The article shows the estimates for quality detection under these conditions. The de-veloped methodology and the resulting estimates can be used to determine quality factors of higher hierarchical level sys-tems. For example, indicators of secondar y signal processing, probability of signal detection (capture) in the search area.

22. Mathematical model for ship life cycle milestones cost assessment through information support systems [№2 за 2014 год]
Author: Tretyakov O.V.
Visitors: 12528
The programming stage plays the most significant role in ship design and construction because the whole range of activities at design and construction stages is carried out for this stage exactly. In conjunction with future opera tional processes design, their cost is defined, and different kinds of resources are planned in the budget. Mistakes in resource for e-casting may lead to funding shortages, failures to support ship readiness at a certain level and decrease the Navy operationa l potential. Conventional techniques for cost evaluation of separate stages of the ship life cycle are based on statistic relations. Such an approach requires regular technique and data updates according to ship design and operation findings. It is not a l-ways possible, especially when new ships operation experience is absent. Furthermore, it is quite challenging to assess (with acceptable error) the impact of ground-breaking decisions taken during ship design and construction on its operational cost using such techniques. The article describes a mathematical model of ship life cycle cost assessment based on activity-based costing analysis. The proposed approach not only enables to assess the ship cost based on the tasks cost, but also reveal the most vulnerable points in making design decisions. The model and its technique are designed for developing the ship life c y-cle information support system. The ship's structural and functional model is an information resource for calculations. And this model is based on the ship general digital model. This is one of the peculiarities of the said approach for cost assessment.

23. On the automated survivability evaluation technology and safety for russian navy ships [№2 за 2014 год]
Authors: Lobanov S.L., Blednov D.A., Sorokin V.E.
Visitors: 6624
Many military shipbuilding specialists connect the numerous accidents and disasters which occurred on ships after the World War II with their insufficient survivability. The paper states that the ship safety is the main feature which can withstand accidents and probable damage in the peacetime during the ship service process under routine con ditions. The au-thors analyse the “safety” term, used in the Russian Navy. They also propose an approach to develop an automated assess-ment technology for this term. This method is based on a minimum level criterion of ship operation. The article describes and proves events which should be excluded to ensure such level of the ship functioning. The ship safety criteria definition is based on its functional efficiency of preventing these events by means (systems) of the ship. Definitions and basic parities to describe their parameters calculation are given. It is offered to enter two management levels of the ship and its means (sys-tems) at struggle for safety: low at manual and high at remote control by means (systems) of the ship. The re is an example of possible division of the ship on emergency regions . Their equipment and mechanisms fall within the scope of adverse factors of various accidents. Safety estimations formalization is based on allocation of the functional -independent operations which are carried out by significant elements of the ship means (systems) on maintenance a minimal necessary level of its functio n-ing. It also is based on construction of functional -topological circuits of elements and structural -logic circuits of these opera-tions performance conditions as direct graph. Quantitative values of functional-independent operations performance parame-ters are calculated according to corresponding circuits to logic expressions. The article considers the process of definition of projected ships safety rating according to entered criteria and parameters, as well as recommendations to increase their safety. The concluding part of the paper formulates a number of proposals to improve ships safety of the Russian Navy.

24. Iterative method of ship landing and stability calculation in systems of the automated survivability assessment [№2 за 2014 год]
Authors: Lushin G.V., Kuryatnikov V.V., Markov M.S., Ivanov B.G.
Visitors: 7497
The article describes the method of calculating landing and stability of an intact and damaged ship in systems of the automated survivability assessment. The iterative method for a given load is based on V.G. Vlasov’s method of succes-sive approximations. It allows solving the problem with given and controlled accuracy degree. It does not solve some spatial problem of in trim landing characterization. It calculates the diagram of crosscut statistic stability of a freely trimmed ship. Calculated parameters of crosscut diagram are used to assess the ship state. The method uses a mathematical model of the ship. It is specified by the point coordinates on the theoretical surface and watertight compartments. It allows calculating the parameters of landing, stability and others that characterize the safety of the ship for a given load (flooded compartments) with controlled accuracy. The article contains load calculation principles for a damaged ship at various ways of flooding watertight compartments, including doubtful flooded compartments. There are certain formula dependances that allow assessing stability of an intact and damaged ship.The authors conclude that using this iterative method can improve the efficiency and reasonability of decision-making and assignment the measures to restore sta-bility.

25. Implementation of the parameter optimization algorithm for molecular dynamic force field REAXFF [№2 за 2014 год]
Authors: Shefov K.S., Stepanova M.M.
Visitors: 9538
Molecular dynamic methods that use ReaxFF (Reactive Force Field) allow obtaining sufficiently good results in simulating large multicomponent chemically reactive systems. ReaxFF is implemented in the standard software package LAMMPS. However, pre-optimization of numerous parameters of this force field for a specific system is required for correct computations. This paper presents a parallel program that implements one-parameter search algorithm for the molecular dy-namic force field ReaxFF. The program uses data obtained by accurate quantum chemical computations of characteristics (training set) of chemical compounds simple models for t he optimization process. The parameter search is based on the min-imization of the error function. This is a sum of squared deviations of training set entries computed by ReaxFF from ones computed by quantum chemical methods. The paper describes the parameter search algorithm and shows the program block-scheme. Molecular dynamic simulator LAMMPS is used to search the minimum of ReaxFF potential energy (optimal geom e-try) of the training set models. The package LAMMPS is compiled as a library and linked to the program. The program al-lows searching ReaxFF parameters for arbitrary types of chemically reactive systems. It is necessary for specific numerical simulations of chemical reactions using the molecular dynamic package LAMMPS on high -performance parallel computers.

26. Modeling of the deformation process in the presence of a phase transition from a potential to dissipative stream [№2 за 2014 год]
Authors: Федотов В.П., Gorshkov A.V.
Visitors: 6074
The paper considers the algorithm for solving nonlinear elasticity issue. Cross-effect in complex systems is determined by the phenomenological components of relevant systems of equations. In these systems the relation between the generalized flows and generalized forces is established based on the Onsa ger’s ap-proach. For the deformation problems, this relation usually is established by Hook’s linear postulate. However, this postulat e can not be a basis for describing the second-kind phase transition from elasticity to dissipative plastic flow. And relating con-tinuous physical quantities (temperature, admixture concentration etc.) can not offset yield strength since the latter is an ex-perimental pointwise quantity. As a practically confirmed hypothesis, it is assumed that the reciprocity factors L km, constant by Onsager, can be nonline-ar functions. For deformation problems we use the Cauchy postulate. It states that the Onsager factor in the elastic region i s a quadratic function of strain. In this case the elasticity problem solution is reduced to the sol ution of nonlinear equation. The application of the finite elements method requires a solution of large -dimension systems and, consequently, it is extremely time-consuming. To reduce the computation time, the boundary element method is used in combination with analytical com-putation if possible. The article considers the example of the algorithm application to solve a nonlinear plane problem of el as-ticity for an inhomogeneous region.

27. A complex of problem-oriented programs for analysis of micro photo images of nanocomposites texture FRA_VA_T [№2 за 2014 год]
Authors: Galaev A.B., Butusov O.B., Meshalkin V.P
Visitors: 12067
A complex of problem-oriented programs for analysis of micro photo images (MPI) of nanocomposites texture "FRA_VA_T" is developed. It is based on the principles of modular and object -oriented programming using Matlab language and Image Processing Toolbox library functions. The software complex is designed according to the original morphological, fractal -wavelet and cluster-morphometric methods and algorithms of MPI analysis previously proposed by the authors. The "FRA_VA_T" complex consists of three main programs: P1is a primary brightness analysis program; P2 is a fractal dimension calculating program, P3 is a cluster-morphometric analysis program for mikrographs of nanocomposites sections and one auxiliary VP-1 program to calculatу the dependency of textural parameters from the input data. Data support of the "FRA_VA_T" complex is a database. It is implemented using MYSQL database and includes r e-loadable with each new research mikrographs input data. This input data contains the original MPI and corresponding numer-ical characteristics, as well as the output data representing the main results of the complex: special generated images and t heir corresponding calculated values of texture parameters of MPI.

28. The software-programmable method of interchannel gradient reconstruction of color digital images [№2 за 2014 год]
Authors: Samoylin E.A., Shipko V.V.
Visitors: 6371
The article considers a reconstruction method of failure elements of the color digital image using interchannel redunancy. Nowadays there are vectorial median filters that show their advantage comparing to traditional component -wise image processing. At the same time they aren’t able to de -update lost signal value always authentically because of the limited aperture sample capture, and also in case of overwhelming quantity of faulty elements in an aperture. Meanwhile, redunancy appearing after transition from gray-scale to color images opens new opportunities for restoration of images signals values lost due to interference attack. In particular, in case of distortion of image element brightness in one of color channels, it is possible to evaluate its value using the brightness amplitude of other color channels appropriate elements. The local gradien ts are the difference between the central aperture element and closely-spaced elements. The base of the method is an assump-tion that the local gradients are approximately equal in the image plane of each component. The results showed that this a s-sumption is fair for many real color digital images.The results of modeling show the superiority of interelement gradient r e-construction over median filtering in reconstruction accuracy of the lost or distorted elements of color image components. The results show that the offered method allows receiving higher accuracy of distorted signals restoration comparing to tradi-tional vectorial median processing. The example of the processing the real color digital image shows the efficiency of the presented method. The study results show the possibility to reconstruct interference signals of color digital images using local gradients of nearby channels. The proposed method implies the software implementation and can be used in different co m-puter systems and independent software modules for color digital images processing.

29. Simulation of taxonomy program of parts production technology for mechanical-engineering using petri nets [№2 за 2014 год]
Author: Shestakov A.M.
Visitors: 11772
The article considers a model created using Petri nets. It allows analyzing the tran smission and receipt of data from computers to the technology taxonomy program for details production on the Internet. The purpose of modeling is simulation of the program failure, deadlocks search (no loops and dead ends), and identifying bottlenecks when transmiting data. In the simulation experiments failures of computer service by the taxonomy program are simulated as appearance of a random number of markers chips in the position. When there are no failures the program works automatically. The position serves the teams on the computer taxonomy. When there is an access denial in the program, the arc closes the transition and returns to the starting position. In normal operating mode at any time the Petri nets programs provide simultaneous conflict -free reference of multiple computers to taxonomy program with parallel work. Parallelism means that any of the computers that receive the access to the program can start referring or finish it before or after the other. The Petri nets apparatus c an be used as a formal language to describe the Web application model of taxonomy of the details production technologies. The Pe-tri nets are an extension of the classical graph theory. The Petri nets theory of enables the system specification using math e-matical representation. Its analysis helps to get important information about the structure and dynamic behavior of the mo d-eled system. Based on Petri nets the spanning tree of the reachability graph is constructed. Its points are all possible reac hable network marks. The analysis of the spanning tree highlightes its properties such as: security (number of marks in any position does not exceed 1); persistence (the inability of appearing and deleting resources in the simulated object) and vividness (no loops and dead ends.) The developed Petri net does not have loops and dead ends. Its taxonomy program can be used in production.

30. Automated control system for science-based mechanical engineering product development [№2 за 2014 год]
Authors: Burdo G.B., Stoyanova O.V.
Visitors: 12607
Nowadays Russian and world markets determine the demand for science-intensive high-tech products in vari-ous fields of mechanical engineering. The reduction of terms in design and production of prototype science -based products (SP) is in focus considering high competition level. The design and production of first innovative samples is a specific task for a number of reasons. This distinguishes it from the tasks and problems facing the serial production and re -engineering (modernization, modification). Due to this task specifics the existing decision support tools can not be effective enough for creating a SP. Therefore, the development of the automated control system of preproduction engineering, manufacture and testing of science-based products (ACS PE&T) is an actual task. New principles of developing the ACS PE&T are set forth. They allow (a) the decision-making processes to be adequate to real production processes, (b) the informational integration into the control hierarchy, (c) the ACS PE&T to be incorp o-rated into the automated support system for a product life cycle, (d) the decision -making procedures to comply with human reasoning as well as experts’ operational algorithm, (e) a manufacturer to reduce the total time (cycle) for a SP sample man u-facturing. A set-theoretic model of the ACS PE&T is developed in terms of the structure and procedure functi ons educed in the process of creating a SP. A set-theoretic model is proved to comply with the established ACS principles. The processes controlled with ACS are performed at the following stages of SP developing: research, development and engineering; designing and preproduction engineering; manufacturing planning; manufacture; quality control and testing. The information conversions within the automated control system are found out and described. A set-theoretic model and a temporal structure model is t he basis for development of methods and algorithms of decision-making in the automated control system.

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