Software & Systems

Articles of journal № 1 at 2017 year.

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21. Editing and entering information into XML-documents of automated information systems [№1 за 2017 год]
Authors: A.N. Trusov, P.Yu. Ivanchenko, D.A. Katsuro
Visitors: 7475
The article considers the issues of automated editing and amending changes to a eXtensibleMarkupLanguage format (XML) configuration file protected from external editing in some automated information system (AIS) with financial and analytical content. It describes the basic idea and the concept of creating a module for editing and entering the infor-mation in an original XML-file in an automated system. It considers a method of providing information system functionality to an end-user by placing a web page on the Internet. The paper shows the algorithm of interaction between a user and program modules. It also describes in detail the technical implementation of the algorithm for editing and automated changing an AIS configuration file without direct interaction with software. The article analyzes the configuration file structure in detail and forms the requirements for its creation. It presents fragments of the configuration file formed structure in the information system, as well as the code referring to the tree element in the XML-file. The authors select the appropriate software implementation to enter social and economic parameters into a configuration file without interaction with a software product. The described approach is necessary when there is a need in operational processing and visual representation of socio-economic information based on situational centers of operational support decision-making in expert analysis of the state and development of socio-economic systems. The authors implemented a software package consisting of the described module and the optimization of financial and analytical AIS, which has been tested in solving problems of social and economic analysis of the situation center in the regional socio-economic development of the Kemerovo branch of the Russian University of Economics named after G.V. Plekhanov.

22. Time delay automatic control systems: robustness, response time, synthesis [№1 за 2017 год]
Authors: V.D. Than, D.Yu. Berchuk
Visitors: 10585
The article considers synthesis of time delay automatic control systems (ACS). A synthesis statement is connected to equation solving by a numerical technique without approximation of a time delay element. This issue has a potential to improve synthesis accuracy of regulators. A real interpolation method (RIM) has number of advantages in synthesis of time delay ACS. RIM allows finding a regulator that compensates time delay using a targeted model, a defined non-approximated mathematical model of object and a regulator structure. Moreover, RIM allows building transfer function with direct quality factors on the stage of developing a targeted model. It’s simpler and more useful for a developer. The article demonstrates potentials of the method using minimal quantity of factors: overshoot and settings time. The targeted model with a defined non-approximated mathematical model and a regulator structure allows building accurate synthesis equation, which is useful for numerical research of synthesis and robust properties of time delay systems. The article proposes an algorithm of a maximal control rate for a time delay system in terms of specified overshoot. It also shows a negative effect of increasing time delay to robustness of the system. A result is graphically illustrated and proved by a number of examples.

23. Statistical analysis of test results of products of aeronautical engineering in terms of random censoring [№1 за 2017 год]
Authors: Agamirov L.V., Agamirov V.L., Vestyak V.A.
Visitors: 7657
The article considers a technique of point and interval estimation of distribution parameters applied in statistical analysis of fatigue tests of aircraft structural elements based on the least squares method. The technique considers censored observations. Relevance of the study is defined by the fact that when estimating distribution parameters for fatigue properties characteristics for a statistical analysis of fatigue tests of aircraft equipment it is necessary to take into account the results of the samples with the test finished before reaching a critical condition. The solution of this problem using known methods (maximum likelihood method) is complicated due to objective function nonmonotonicity, a number of local extremes, etc. The first part of the article is devoted to a technique of estimating distribution parameters of observed random variables for a complete sample, which were transformed from repeatedly censored (incomplete) sample by bootstrap simulation based on order statistics. Transformation of an original randomly censored sample into a quasicomplete one is carried out in order to use the least squares method to estimate distribution parameters since this method is applicable only for a complete sample. The second part of the article is devoted to construction of confidence limits for a quintile of observed random variable distribution. In the aircraft engineering it is applicable for assessment of a guaranteed resource normalized on a lower confidence limit of a durability quintile. The article considers a reduction technique of repeatedly censored incomplete sample in a general case to an equivalent quasicomplete sample, for which it is possible to use the least squares method and receive the most stable and efficient evaluation with minimum dispersion. Thus, the problem of point and interval estimation of distribution parameters of fatigue properties characteristics of aircraft structure elements considering multicensored observations is solved.

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