scholarly journals Technology for restoring functional dependencies to determine reliability parameters

2021 ◽  
Vol 101 (1) ◽  
pp. 78-86
Author(s):  
V.P. Kvasnikov ◽  
◽  
S.V. Yehorov ◽  
T.Yu. Shkvarnytska ◽  
◽  
...  
Keyword(s):  
Interpolation Polynomial ◽  
Electronic Equipment ◽  
Optimal Interpolation ◽  
Electronic Systems ◽  
Functional Dependencies ◽  
Interpolation Methods ◽  
Reliability Parameters ◽  
Discrete Sample ◽  
Failure Statistics ◽  
Qualitative Characteristics

The problem of determining the properties of the object by analyzing the numerical and qualitative characteristics of a discrete sample is considered. A method has been developed to determine the probability of trouble-free operation of electronic systems for the case if the interpolation fields are different between several interpolation nodes. A method has been developed to determine the probability of trouble-free operation if the interpolation polynomial is the same for the entire interpolation domain. It is shown that local interpolation methods give more accurate results, in contrast to global interpolation methods. It is shown that in the case of global interpolation it is possible to determine the value of the function outside the given values by extrapolation methods, which makes it possible to predict the probability of failure. It is shown that the use of approximation methods to determine the probability of trouble-free operation reduces the error of the second kind. A method for analyzing the qualitative characteristics of functional dependences has been developed, which allows us to choose the optimal interpolation polynomial. With sufficient statistics, using the criteria of consent, it is possible to build mathematical models for the analysis of failure statistics of electronic equipment. Provided that the volume of statistics is not large, such statistics may not be sufficient and the application of consent criteria will lead to unsatisfactory results. Another approach is to use an approximation method that is applied to statistical material that was collected during testing or controlled operation. In this regard, it is extremely important to develop a method for determining the reliability of electronic systems in case of insufficiency of the collected statistics of failures of electronic equipment.

MODEL FOR ASSESSMENT OF DECISION SUPPORT APPLICATION EFFICIENCY IN RADIO-ELECTRONIC EQUIPMENT MAINTENANCE PROCESSES

2018 ◽  
pp. 66-68
Author(s):  
V. B. Tikhonov
Keyword(s):  
Electronic Equipment ◽  
Electronic Systems ◽  
Informational Support ◽  
Military Equipment ◽  
Radio Electronic ◽  
Study Results ◽  
Feasibility Evaluation ◽  
Readiness Level ◽  
Technical Operation ◽  
Maintenance Personnel

Modern radio-electronic systems (RES) of weapons and military equipment (WME) are more functionally and structurally sophisticated that results in high requirements for their effective operation organisation. Insufficient level of technical knowledge among RES WME operational and maintenance personnel often results in increase of operability restoration period of these items in case of failures. This, in its turn, results in decrease of the readiness level of the RES WME pieces. In order to reduce duration of the RES WME restoring repair in case of failures, methods and tools of the auto-mated informational support of the operational and maintenance personnel activities related to the WME operation and restoring repair are developed. This article is devoted to development of a model of the automated informational support of the personnel activities in order to find rational options of the RES WME maintenance and repair organisation. The study results related to feasibility evaluation and development of the automated technical operation system model for the radio-electronic equipment incorporated in the AD WME are provided.

scholarly journals On Hermite-Fejér type interpolation on the Chebyshev nodes

1993 ◽  
Vol 47 (1) ◽  
pp. 13-24 ◽  
Author(s):  
Graeme J. Byrne ◽  
T.M. Mills ◽  
Simon J. Smith
Keyword(s):  
Approximation Error ◽  
Interpolation Polynomial ◽  
Precise Estimate ◽  
Type Interpolation ◽  
Interpolation Methods ◽  
Chebyshev Nodes ◽  
Interpolatory Process

Given f ∈ C [−1, 1], let Hn, 3(f, x) denote the (0,1,2) Hermite-Fejér interpolation polynomial of f based on the Chebyshev nodes. In this paper we develop a precise estimate for the magnitude of the approximation error |Hn, 3(f, x) − f(x)|. Further, we demonstrate a method of combining the divergent Lagrange and (0,1,2) interpolation methods on the Chebyshev nodes to obtain a convergent rational interpolatory process.

Research about Influencing Factor on Interpolation Accuracy in Data Exchange of Fluid-Structure Interaction

2013 ◽  
Vol 318 ◽  
pp. 100-107
Author(s):  
Zhen Shen ◽  
Biao Wang ◽  
Hui Yang ◽  
Yun Zheng
Keyword(s):  
Data Exchange ◽  
Shape Function ◽  
Interpolation Method ◽  
Matching Condition ◽  
Optimal Interpolation ◽  
Complex Interpolation ◽  
Interpolation Function ◽  
Interpolation Methods ◽  
Interpolation Accuracy ◽  
Lower Accuracy

Six kinds of interpolation methods, including projection-shape function method, three-dimensional linear interpolation method, optimal interpolation method, constant volume transformation method and so on, were adoped in the study of interpolation accuracy. From the point of view about the characterization of matching condition of two different grids and interpolation function, the infuencing factor on the interpolation accuracy was studied. The results revealed that different interpolation methods had different interpolation accuracy. The projection-shape function interpolation method had the best effect and the more complex interpolation function had lower accuracy. In many cases, the matching condition of two grids had much greater impact on the interpolation accuracy than the method itself. The error of interpolation method is inevitable, but the error caused by the grid quality could be reduced through efforts.

scholarly journals Computer Simulation of Complex Electronic Systems of Navigation Systems

2020 ◽  
Vol 35 ◽  
pp. 04021
Author(s):  
Victor V. Shcherbinin ◽  
Ravil R. Zagidullin ◽  
Georgy A. Kvetkin ◽  
Marina S. Sidorova
Keyword(s):  
Computer Simulation ◽  
Navigation System ◽  
Electronic Equipment ◽  
Electronic Systems ◽  
Navigation Systems ◽  
Software Complex ◽  
Radio Electronic ◽  
Local Navigation ◽  
Using Data

The paper proposes ways to reduce the time and improve the quality of development of electronic equipment using computer simulation. The paper considers an example of the development and debugging of a radio-electronic module, which has found its direct application in a local navigation system that operates on the basis of the method of point landmarks. The paper considers a hardware-software complex for the implementation of the study of the health of both individual functional units and radio rangefinder equipment as a whole, as well as for the modernization of the radio-electronic module of the navigation system. The various computer simulation environments available today allow the development and design of electronic equipment at various levels. In the proposed work, computer simulation was carried out in MATLAB / Simulink, LabVIEW, Multisim and MicroCap. The work also provided for the possibility of using data collection and processing modules, which provides the opportunity in one software development and modeling environment to compare the results obtained using simulation modeling and physical research of the object. The result of the work is a hardwaresoftware kit of the radio-electronic module of the navigation system through which it is possible to evaluate the influence of various external influences on the accuracy of determining the range from the interrogator (moving object) to the transponder (stationary beacon).

Integration of e-Government Bases as a Means for Ensuring Economic (Tax) and Information Security

2020 ◽  
Vol 9 (3) ◽  
pp. 1039
Author(s):  
Bagdat T. SEITOV ◽  
Medet S. ZARKENOV ◽  
Nazarbek Sh. ZHEMPIISSOV ◽  
Oleg B. KHUSSAINOV ◽  
Dauren P. UTEPOV
Keyword(s):  
Public Procurement ◽  
Integrated Approach ◽  
Electronic System ◽  
Economic Security ◽  
Economic Crime ◽  
Electronic Systems ◽  
Property Relations ◽  
Legal Method ◽  
Initial Stage ◽  
Qualitative Characteristics

In this article, on the basis of an integrated approach, a comparative legal method of cognition, it is proposed to integrate the bases of electronic governments to improve measures to effectively counter economic crime and ensure economic security. Given the global progress in dynamically developing market and civil property relations, in the context of the digitalisation of the economy, the methods of committing many crimes are evolving, their qualitative characteristics and methods of commission are changing. According to the authors, the information model of the integration of electronic systems of tax and other state bodies into a single electronic system will successfully prevent and combat crimes in the field of IT-technologies at the initial stage of using information systems. In the future, the integration of electronic ‘Governments for citizens’ of different countries available for use by citizens and organisations in the field of taxes, public procurement, etc. into a single system will significantly increase information and economic security at the global level.

scholarly journals Probabilistic analysis of the strength and reliability of reinforced concrete structures under low-temperature impact

2018 ◽  
Vol 212 ◽  
pp. 01026
Author(s):  
Boris Pinus ◽  
Zhanetta Pinus
Keyword(s):  
Reinforced Concrete ◽  
Low Temperature ◽  
Functional Dependencies ◽  
Statistical Parameters ◽  
Reliability Parameters ◽  
Strength And Deformation ◽  
Temperature Impact ◽  
Concrete Elements ◽  
Random Nature ◽  
Kinetics Of

The paper presents the results of numerical modeling of the kinetics of strength and reliability of bent reinforced concrete elements in the process of cyclic low-temperature and humidity effects of various levels. In this case, the calculated strength model is adopted in accordance with the normative functional dependencies, taking into account the random nature of the implementation of the input parameters, while the reliability model is in the form of a safety factor determined by the statistical parameters of their distributions. The latter are taken on the basis of representative empirical data of changes in the strength and deformation of concrete and reinforcement (in concrete) at certain stages of depletion of the standard resource of frost resistance. Substantial differences are established in the change in the strength and reliability parameters for the FTC and the determining effect of the reinforcement level on their kinetics.

scholarly journals Mathematical model for producing machine parts

2021 ◽  
Vol 264 ◽  
pp. 04078
Author(s):  
Kamolkhon Karimov ◽  
Nodir Turakhodjaev ◽  
Azamat Akhmedov ◽  
Shukhrat Chorshanbiev
Keyword(s):  
Heat Treatment ◽  
Mathematical Model ◽  
Mathematical Models ◽  
Technological Process ◽  
Aluminum Content ◽  
Experimental Studies ◽  
Interpolation Polynomial ◽  
Electroslag Remelting ◽  
Functional Dependencies ◽  
Analytical Studies

In the article, the object of research is the development of a technology for improving the operational properties of cast parts from steel 45, obtained by the method of electroslag remelting. Based on the research results, the modes of heat treatment of the shaft-gear part in an aqueous medium water-oil, heat treatment to increase the service life of the product, and energy-saving melting technology by the method of electroslag remelting were developed. Particular attention is paid to the development and analytical implementation of the mathematical model of the developed technologies by the methods of linear algebra by drawing up the Lagrange interpolation polynomial. Functional dependencies have been obtained for determining the amount of oxygen in the melt depending on the diameter of the electrode and the aluminum content in this electrode for any diameter of the mold, the hardness of the shaft surface depending on its diameter, the oxygen content (amount) in the melt depending on the aluminum content in the electrode for different mold diameters. Based on the developed and analytically implemented mathematical models of the investigated technological process, it seems possible to simplify experimental studies. In other words, based on analytical studies, it is possible to predict the results of subsequent experiments. Based on the developed and analytically implemented mathematical models of the investigated technological process, it seems possible to simplify experimental studies. In other words, based on analytical studies, it is possible to predict the results of subsequent experiments.

Optimal interpolation methods for farmland soil organic matter in various landforms of a complex topography

2020 ◽  
Vol 110 ◽  
pp. 105926 ◽  
Author(s):  
Jun Long ◽  
Yaling Liu ◽  
Shihe Xing ◽  
Liming Zhang ◽  
Mingkai Qu ◽  
...  
Keyword(s):  
Organic Matter ◽  
Soil Organic Matter ◽  
Optimal Interpolation ◽  
Complex Topography ◽  
Interpolation Methods ◽  
Farmland Soil

Development of Compact Thermal–Fluid Models at the Electronic Equipment Level

2012 ◽  
Vol 4 (3) ◽  
Author(s):  
Jason Stafford ◽  
Ronan Grimes ◽  
David Newport
Keyword(s):  
Boundary Condition ◽  
Multiple Scales ◽  
Flow Characteristics ◽  
Electronic Equipment ◽  
Compact Model ◽  
Electronic Systems ◽  
Fluid Models ◽  
Electronic Components ◽  
Detailed Model ◽  
Computational Fluid Dynamics Cfd

The introduction of compact thermal models (CTM) into computational fluid dynamics (CFD) codes has significantly reduced computational requirements when representing complex, multilayered, and orthotropic heat generating electronic components in the design of electronic equipment. This study develops a novel procedure for generating compact thermal–fluid models (CTFM) of electronic equipment that are independent over a boundary condition set. This boundary condition set is estimated based on the information received at the preliminary design stages of a product. In this procedure, CFD has been used to generate a detailed model of the electronic equipment. Compact models have been constructed using a network approach, where thermal and pressure-flow characteristics of the system are represented by simplified thermal and fluid paths. Data from CFD solutions are reduced for the compact model and coupled with an optimization of an objective function to minimize discrepancies between detailed and compact solutions. In turn, an accurate prediction tool is created that is a fraction of the computational demand of detailed simulations. A method to successively integrate multiple scales of electronics into an accurate compact model that can predict junction temperatures within 10% of a detailed solution has been demonstrated. It was determined that CTFM nodal temperatures could predict the corresponding area averaged temperatures from the detailed CFD model with acceptable accuracy over the intended boundary condition range. The approach presented has the potential to reduce CFD requirements for multiscale electronic systems and also has the ability to integrate experimental data in the latter product design stages.

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