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Chernyi S.G.,Kerch State Marine Technological University
Neftyanoe Khozyaystvo - Oil Industry | Year: 2016

The analysis of drilling rigs, being operated currently at depths of about 2500-8000 meters, shows that for the drilling of oil and gas wells on the territory of the Russian Federation, the rigs with the direct current controlled- velocity electric drive, are the majority. Thus, rigs with drilling depth more than 4500 meters and offshore drilling rigs belong to consumers of the first category. Application of direct current electric drive like that of induction drive as an alternative solution for them is caused by necessity to ensure more advanced adjustment while controlling the drilling unit's main mechanisms. The peculiarities of these units are: The high input power of actuators; the availability of a number of actuators with adjustable and non- Adjustable characteristics; the high degree of pulling- And-running operations' mechanization and other operations; the control flexibility and the ease of operation. The structure of electrical power system with the main direct current drive is typical for all the categories of the investigated drilling rigs with autonomous power supply [1]. The diesel-generator set DGS1, DGS2 units, etc. consisting of the synchronous generators SG1, SG2, etc. set into rotation by the diesels D1, D2 etc. are used as the main sources of the electric power on them. All generators are connected across, that is their power is summarized on the joint buses (DGS1 - The diesel-generator set (the diesel D1 + the generator SG1); AFR (automatic frequency regulator), AVR (automatic voltage regulator) - The automatic control systems of synchronous generator's frequency and voltage). The systems of the automatic control of voltage (AVR) and the automatic control of frequency (AFR) are used for DGS which is the leading one in the group of parallel-working generators. For DGS which are secondary in the group of parallel-working generators are realized the regulation of active and reactance with the use of the adjusters (controllers) respectively, AAPR and ARPR effecting on the diesel through a fuel system, and on the generator - Through a field system. Herewith the operation of an offshore drilling rig is characterized by: The limitation of power station's power; the commensurability of power of converting load of the controlled-velocity electric drive and the station's power; pronounced variable loading conditions; the considerable change of the maximum loads depending both on the current depth of a well, and on the lithologic conditions of drilling; continuous alterations of electric power system of the drilling rig electro technical complex connected: With the change of the working electric drives' number depending on drilling conditions; with the change of a number parallel-working synchronous generators depending on drilling conditions. © Copyright 2016. Source

Chernyi S.,Kerch State Marine Technological University
Metallurgical and Mining Industry | Year: 2015

RFC6455support, JSON in JavaScript format have been analyzed and studied. The model of the formation of an expert group for decision-making support has been proposed. The process of interacting of software modules is described from the perspective of the processes of coordination of the system. © Metallurgical and Mining Industry, 2015. Source

Sytnik N.A.,South Research Institute of Marine Fishery and Oceanography | Zolotnitskiy A.P.,Kerch State Marine Technological University
Hydrobiological Journal | Year: 2014

Dependence of filtration and respiration rate in the flat oyster on water emperature was studied. Parameters of the exponential equation of relation of the considered functions with the body mass within the temperature interval 10-23°C were determined. Specific filtration rate varied over the range 0.88-2.37 l/hour?g, regression coefficient - 0.435-0.513, specific respiration rate varied over the range 0.291-0.725 mg O2/hour?specimen, regression coefficient - 0.688-0.773. Relation F/R (index of filtering activity) at different temperature varied insignificantly - from 4.41 to 4.82 l/ml O 2. Relatively stable relation of filtration and respiration rates over natural seasonal temperature rhythm indicates compensatory modification of filtration and metabolism intensity under changing temperature. © 2014 Begell House, Inc. Source

Ivanovskaya A.,Kerch State Marine Technological University
Journal of Vibroengineering | Year: 2010

Free vibrations of the single-mass system with variable parameters that characterize inertia, friction, rigidity are considered. For an exact analytical solution the method of constant coefficients under derivatives with a new variable is proposed. © Vibroengineering. Journal of Vibroengineering. Source

Chernyi S.,Kerch State Marine Technological University | Zhilenkov A.,Kerch State Marine Technological University
Transport and Telecommunication | Year: 2015

One of the most essential tasks for a number of systems of the automatic controls in the autonomous electric power systems of the water transport is accurate calculation of variable harmonic components in the non-sinusoidal signal. In the autonomous electric power systems operating with full semiconductor capacity, the forms of line currents and voltages are greatly distorted, and generator devices generate voltage with inconsistent frequency, phase and amplitude. It makes calculation of harmonic composition of the distorted signals be a non-trivial task. The present paper provides a mathematical set for solution of the outlined problem including the realization in the discrete form. The simplicity and efficiency of the system proposed make possible to perform its practical realization with the help of cheap FPGA. The test of the developed system has been performed in the medium Matlab. Source

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