PNRPU Bulletin. Electrotechnics, Informational Technologies, Control Systems

The complex analysis of prospects of improvement of functionality and power characteristics of centrifugal superchargers of gas at compressor stations of the main gas pipelines is offered. It is shown that energy saving approach to implementation of requirements of increase in efficiency and useful use of energy technological installations and units on objects of fuel and energy complex provides need of carrying out gas-dynamic researches on gas-distributing units of booster and linear compressor stations. The reasons of emergence of off-design operating modes of the main gas pipelines which are connected with change of their configurations, change of parameters of units, fluctuations of relief and natural factors, and also redistribution of loadings of gas between shops are proved. The analysis of natural tests of various centrifugal superchargers with standard extents of compression and use of replaceable flowing parts is provided. The main characteristics of superchargers of 235-21-1 and 235 type of HRC 1,32/76 - 5000 on temperature and power consumption are compared. Their initial inefficient modes at compressor stations have a talk an initial mismatch of gas-dynamic parameters of units with characteristics of network of gas pipelines and decline in production in comparison with the project. The principles and structure of a technological chain of realization of a technical means and algorithms of energy efficient technologies with obtaining additional effects of energy saving are considered. The indirect reserves shown in article on decrease in an expense of the electric power at compressor stations are provided, in particular, with additional charge in parallel of the working units on giving and on power, stability of collaboration within the shop and restriction of hit in a surge zone. Recommendations about further improvement of characteristics of centrifugal superchargers of a megawatt class at gas-turbine compressor stations are offered.

This article provides an overview and analysis of the main methods of parametric identification of the induction motor. The problem of shortage and inaccuracy of information on actual parameters of the equivalent circuit of induction motor is v. Main parameters, which are necessary to take into account the implementation of vector control systems are selected. Classification and analysis of different identification methods are are implemented. Identification methods to be implemented in real-time and pre-adaptation mode, the drive, before putting it into operation are compared. The main advantages and disadvantages of identification methods are marked. Methods based on the processing available for measurement of phase currents and voltages are the most common. A mathematical model of an asynchronous machine is used to determine the parameters in most identification methods. Various modifications of the Kalman filter and the least squares method are the most promising to estimate the parameters in real time. In the pre-setting of the actuator usually are used active methods by inserting into the power circuit of the electric drive a test information signal. A variant of constructing the structure of systems of this class is proposed. In conclusion, it is noted that the assessment and identification of induction motor parameters are relevant and need detailed study with the development of new algorithms and approaches. In the course of further work, it is planned to develop and study a system of preliminary identification of the parameters of an induction motor using an experimental laboratory installation of an AC drive.

Considerable sophistication of automatic monitoring and control systems in the gas turbine engine development can be seen today, and their verification is complex for a number of reasons. Control systems R&D require a control object that is a gas turbine engine. Processes of demonstration automatic control systems and GT engines design, their joint testing and engineering development are time and money consuming activities associated with great risks. The more time a project takes and higher the risks are, the more expensive it becomes. In order to reduce that risks and time, improve the R&D quality when developing new ACS projects and checking current ones, the real control object could be replaced with its simulator and its mathematical model. The bench pre-check of ACS electronic assemblies and Automatic Control Systems using HIL simulations allows to: avoid a lot of errors by software and algorithms prior to production of the controller unit and GT engine demonstrator; analyze the ACS & C algorithms being developed at the initial stages of the life cycle; refine the interaction interfaces between the ACS & C elements; estimate a compliance with the technical specifications for the ACS & C electronic units before the beginning of the engine tests making it possible to introduce early corrections; and study potential causes of abnormal incidents in the ACS & C electronic units during operation. The paper describes the iron bird tests of automated control system electronic section based on the example of bypass flow engine.

At present, one of the trends in Russian science and education is the so-called import substitution of electronic components. At the Department of Automation and Telemechanics, research is being carried out in this direction, related to the subjects of control and testing of aircraft engines, communication and telecommunications equipment, and complex information protection. There is creative cooperation with the academic institutes of the Russian Academy of Sciences. Great importance is given to the engineering preparation of students and post-graduate students in circuit engineering. In this regard, in connection with the limitations of the newly introduced standards of higher education, there arises the problem of a shortage of time for laboratory practice. One of the ways to solve it may be a closer "bundle" of disciplines studied in one semester in order to intensify the learning process, the use of new methodical techniques that allow carrying out accelerated experiments using circuit simulation systems. Thus, the estimated part of some laboratory exercises on discipline "Circuitry" can be performed within the discipline "Discrete Mathematics" in the topic "Finite-State Machine ". Tasks for synthesis can be scaled in view of the time allocated, and the experiment itself can be conducted on the basis of blanks - templates. The article offers methodological techniques of accelerated laboratory research on the synthesis of finite-state machine-sequences set generator for the discipline "Circuitry" on the basis of templates in which it is necessary to make changes in line with the job option. Possible tasks can be shaped in the form of names and surnames of students. The paper proposes a method that allows within 2-4-hour lesson hold both calculations and experiment.

In the modern digital world, more and more data processing is required. When working with them, often use the technology of knowledge engineering. This article examines the ontological approach and focuses on the visual representation of ontologies. The prerequisites for creating a multi-user adaptable ontology editor MulTOnt 1.0 are discussed. The shortcomings of the created research prototype are analyzed, changes of version 1.1 are shown. Based on the requirements for the multi-user editor, the requirements for version 2.0 are highlighted. Based on them, some new features of the editor are considered. In particular, there is a detailed overview of the simultaneous operation of several users at once with a whole set of ontologies. The paper considers the mechanism of processing a dynamic URL in ASP.NET. Also, a comparative analysis of technologies that allow you to embed one website into another. We consider technologies such as Flash / Silverlight / JavaFx,