PNRPU Bulletin. Electrotechnics, Informational Technologies, Control Systems

The optimal schedule, on the one hand, is a practical necessity to conserve resources, for example, problem in the multiprocessor computing systems. On the other hand, many of the scheduling problems are NP-hard and can not be solved exactly in polynomial time. Flow shop scheduling problem is the one of the most famous optimization problem. The scheduling problem is to find sequences of jobs on given machines with the objective of minimizing some function of the job completion times. All jobs pass through all machines in the same order. There is exact polynomial Johnson's algorithm for two machines. But it is NP-hard problem in case of an arbitrary number of machines. In practice, either trivial exhaustive search algorithms with exponential complexity are used when the number of jobs is not large, either some fast approximation algorithms, for example, the frontal algorithm. In this paper a new approach for the approximate solution of the flow shop scheduling problem is proposed. It uses double sorting. For each job, the stage durations are previously sorted in descending order. Stage numbers are written as a character string (classification). These job classifications lexicographically are sorted in descending order. Therefore, jobs with the longest last stage will be executed firstly. Then work with the longest penultimate stage will be executed and so on. It means that the last machine, and then the penultimate machine etc. at the beginning are loaded with the largest jobs. It allows them to avoid idle waiting for the next jobs. The practical implications of this paper is higher accuracy of the lexicographical algorithm compared with the frontal algorithm to works, where the number of jobs more than the number of stages, however the frontal algorithm is faster. The paper provides data about accuracy and execution time of these algorithms depending on the number of jobs and stages.

The organization of labor protection in enterprises in recent years the management of production risks becoming the main mechanism to ensure safe working conditions at the workplace. Control of physical environment factors at work in the Volgograd branch of PJSC "Rostelecom" is one of the elements of the "prevention of danger" in the workplace. Monitoring of physical factors in the workplace in accordance with the current legislation is a must event. In the Volgograd branch of the measurement of physical factors held within the framework of production control. To carry out production control in the Volgograd branch has accredited as a testing laboratory in the national accreditation system of labor protection. One of the areas of production control of physical environment factors is - measurements of electromagnetic radiation in the microwave range at the workplace. Our own laboratory, part of the occupational health service is cost-effective and profitable exercise in terms of creating a healthy and safe working conditions in the workplace. This article analyzes the legal framework of production control. Provides information on administrative penalties for lack of laboratory research protocols (measurements) and the production control program. Analyzed measurements of the energy flux density of 8 Rakita equipment in the workplace. Analyzed the average annual time spent on maintenance of equipment maintenance unit Rakita 8. The schedule of dependence of the energy flux density of the exposure time. The conclusions of the occupational risks of electromagnetic radiation when servicing equipment.

Operational operating modes of turbocompressors as gas-distributing units of compressor stations of the main gas pipelines are considered. The analysis of statistical data of breakdown rate of electrodriving units at compressor stations of the main transport of gas depending on operating modes and places of damages is carried out. Need of increase in safety of functioning of electrodriving turbocompressors by optimization of course of the transitional modes by decrease in dynamic components of currents and the moments of the synchronous car of a megawatt class is proved. The electromagnetic and electromechanical processes happening in the electric drive during the work on turbocompressor loading are considered. Examples of modernization of the existing electrical machines according to requirements of the starting modes of gas-distributing units at compressor stations are given.Examples of modernization of the existing electrical machines according to requirements of the starting modes of gas-distributing units at compressor stations are given. Options of comparison of the existing and innovative systems of safe launch of synchronous electric motors of electrodriving gas-distributing units to use of the latest methods, technical means and control algorithms of start are analysed. Need of control and optimization of the key electrodynamic parameters of the driving electric motor of the gas-distributing unit according to the mode of pumping of gas and technical parameters of the cars and adjacent units working according to the parallel scheme is proved. Results of computer modeling of the starting modes of electrodriving units with devices of reactor, smooth, quasifrequency and frequency start-up are received. Major importances of dynamic components of current of the stator, the electromagnetic moment and flux linkage, and also value of parameters of electromagnetic compatibility with a power line of average tension are compared. It is shown that the smallest impact on network is exerted by process of frequency launch of synchronous cars, providing observance of standard indicators of compatibility. Methodical, hardware and algorithmic means are developed for operational management of engines of turbocompressors of big power in the dynamic modes.

In today's modern digital world, a lot of attention is paid to the processing of Big Data. For correct operation with Big Data is necessary to use different techniques of knowledge engineering. This article touches upon the ontological knowledge engineering. Special attention is directed to the article knowledge representation in the form of ontologies. Often, the development of an ontology being with a team of engineers, and each teammate must have the ability to edit the ontology, which is developing in real-time, moreover all its changes should replicate for other developers. Based on this article and highlighted one of the main requirements for the editor - multi-user access. Another basic requirement for modern ontology editor - adaptability. The article discusses the need to fine-tune the visual representation of ontologies, depending on personal preference. The article shows that the adaptation mechanisms MulTOnt editor based on meta-knowledge, and this knowledge is presented in the form of metaontology editor. This approach to the representation metaknowledge also applies to other modern graphical editor, ontology, developed on the basis PSNRU supported by the company ITT - ONTOLIS. This makes it possible to adapt the ontology editor for graphical user preferences, you can configure the reaction of the editor on different DOM event. The article talked about the multiplayer adaptable editor MulTOnt 1.0, showing his shortcomings. The first drawback, sanctified in the article - the inability to inherit the styles, the second drawback - the lack of functionality, allows you to select a hierarchy of concepts. The relevance of these shortcomings and editor MulTOnt version 1.1, which does not contain in itself these shortcomings, are discussed further in this article.

The modular design of the automated systems associated with the process of partitioning (decomposition) of the system into separate loosely coupled components, allowing for their relatively independent development and use. A decomposition method widely used in scientific research and in particular in the development of automated control systems. Decomposition of information and software called modularity. Modularity is connected with the creation of such a structure software that gives the greatest effect in the creation and operation of the software. The task of partitioning a complex system into functional modules occurs in the technical design stage, which generated total system requirements, and defines the system executes the functions processing the input data and the intermediate and output results. The initial data for the problem are many different types of input, intermediate and output data, as well as many of the required procedures. The attitude of many procedures to a variety of information elements can be conveniently represented in the form of a bipartite graph, arcs which connect the procedure with the relevant information elements. Partitioning information support of automated control systems into modules is to split a given set of procedures for disjoint subsets with the minimum number of shared information items. Most clearly, this formulation can be represented as a graph whose vertices are the treatments and their connecting arcs correspond to the available information elements. The article describes the application of topological decomposition to optimize the structure of the enterprise. Also carried out the evaluation of the results obtained from the point of view of economic efficiency of functioning of enterprise.