Kerch State Marine Technological University

Kerch, Russia

Kerch State Marine Technological University

Kerch, Russia
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Chernyi S.,Kerch State Marine Technological University | Zhilenkov A.,Kerch State Marine Technological University | Sokolov S.,Admiral Makarov State University of Maritime and Inland Shipping | Titov I.,Saint Petersburg State University
Metallurgical and Mining Industry | Year: 2015

The stabilization problem of two or three parallel operating diesel gas generators as part of autonomous electric energy system is considered in the article. This system working conditions are considered as a part of mountainous self-contained platform where ship electric mains load sharp changes are unsuitable for existing diesel gas generators automatic control systems because the latter are characterized by rotating speed high instability. Rotating depends on generator loads (torque), hence the diesel gas generator frequency controller adjustment must be improved depending on its operational conditions. The drilling rig autonomous electric energy system operation analysis allowed establishing that commutation processes based on loads loss and connection cause mains voltage and frequency fluctuations. Their spectrum is of the same frequency range as DGGS rotating oscillation spectrum, this conduce to power oscillations onset between parallel-working generators. On the conducted experiments basis the diesel gas generator speed controller adjustment factors values, which provide the best transient process with specified power, were obtained. It is seen from conducted analysis that the controller adjustment should be conducted under minimum power rather than normal power. It was demonstrated that however the load increment will cause stability margin increase. On the decibel-log frequency characteristic (DLFC) method basis, the analytical dependence between diesel engine and controller parameters was established. This dependence allows system oscillation acceptable degree establishing. © Metallurgical and Mining Industry, 2015.


Zhilenkov A.,Kerch State Marine Technological University | Chernyi S.,Kerch State Marine Technological University
Energy Procedia | Year: 2015

The paper explores new approach for the real-time identification of harmonic composition of the distorted signals (voltages and currents) of autonomous electric power systems with inconsistent frequency, phase and amplitude, and which can be greatly distorted. The identification of target non-stationary harmonics is made by adjustment of the parameters of the relevant functionprototype. The proposed method of tracking the parameters of any harmonic of the distorted signal makes possible to provide unique, stable and convergent solution of the non-linear dynamic system. The obtained algorithm provides the unique asymptotic trajectory, being periodical and lying in the vicinity of the approximated function - target harmonic of the signal. This method may be successfully applied in design of the multivariable systems for identification of external parameters in the water transport and in other autonomous electric power systems. The test of the developed system is performed in the medium Matlab and the algorithm's practical implementation by FPGA sources is proposed. © 2015 The Authors. Published by Elsevier Ltd. This is an open access article under the CC BY-NC-ND license.


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.


Maksimov A.B.,Kerch State Marine Technological University | Gulyaev M.V.,Kerch State Marine Technological University | Erokhina I.S.,Kerch State Marine Technological University
Steel in Translation | Year: 2016

The laminar development of damage in thick 10Г2С1 steel sheet during cold plastic deformation by cyclic flexure is investigated. The steel is subjected to pure flexure in a symmetric cycle, with strain of amplitude 5.5%. The variation in steel strength indicates the damage kinetics in the plastic deformation. In the region of reversible damage, the rate of change in the strength increases to a maximum and then declines. In the region of irreversible damage there is no further change in strength of steel before failure occurs. An upper limit is proposed for the damage of the steel: 20–30% of Nf, where Nf is the number of cycles to failure in cyclic extension–compression. In structural terms, the upper limit of reversible damage is assumed to correspond to the transformation of cellular dislocation structure to band structure. © 2016, Allerton Press, Inc.


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.


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.


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.


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

We have given the results of developing of a method of neuro-fuzzy structures self-organization in intelligent process control systems. The proposed modification of the basic algorithm can improve the control performance index of intelligent automated control systems at a reduced volume of calculations and corresponding increase of system performance. In classical training rule, fuzzy neural networks and the number of production rules, type of membership functions, fuzzy inference of algorithm type, etc. is given a priori and does not change during the network training. In the case of an incorrect choice of these parameters fuzzy neural networks can be ineffective in the field of automation. Operation of the developed algorithm is based on the theory of sampling frequency and training frequency distribution. In traditional adaptive control systems parameters are adjusted once every sampling period, thus the sampling rate and update rate are not separated. In order to reduce the algorithm running time and improve its efficiency when performing parametric synthesis of asymptotically stable intelligent control systems, the experts determine method of the concentration coefficient of membership functions and sampling limits for further adjustments to the base of the adaptive-established rules. One of the most essential tasks for a number of systems of the automatic controls in the autonomous electric power systems of water transport is accurate calculation of variable harmonic components in the non-sinusoidal signal. In the autonomous electric power systems being operated 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 is performed in the Matlab medium. © Metallurgical and Mining Industry, 2015.


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.

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