№1(9) 2018

Постійне посилання зібрання

https://eir.nuos.edu.ua/handle/123456789/3328

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Зараз показуємо 1 - 20 з 21

Assessment of rigidity of the designed intermittent connections in ship structures
(2018) Korobanov, Yu. N.; Kuznetsov, A. I.; Hrabenko, A. A.; Коробанов, Ю. Н.; Кузнецов, А. И.; Грабенко, А. А.
The article presents the assessment of rigidity of ship intermittent connections. The stress distribution and the values of rigidity coefficients of intermittent connections of the structure have been studied. The analysis is based on the results of computational procedures which follow the finite and boundary element methods to the contrary of the numerical methods used by other authors who cover the same topic. It has been established that there is a great variance and a lot of allowances in rigidity coefficients, as well as methods for their calculation. An analysis of methods for determining rigidity coefficients has shown that they cannot practically be introduced into the computer-aided system for ship structure design in the form presented in appropriate literary sources. In addition, the paper covers various ap-proaches to interpretation of the rigidity coefficients of intermittent connections and methods for their calculation using the example of a discontinuous plate. It is shown how to apply the finite and boundary element methods with their possible integration into computer-aided design systems.
Automation of the monitoring and control processes of a mobile robot for processing of large inclined surfaces
(2018) Kozlov, O. V.; Gerasin, O. S.; Kondratenko, Yu. P.; Kushnir, V. O.; Козлов, О. В.; Герасін, O. C.; Кондратенко, Ю. П.; Кушнір, В. О.
The article renders special features of the design of a tracked mobile robot (MR) for moving over inclined ferromagnetic surfaces while performing specified technological operations. There is conducted a synthesis of the functional structure and selective technological parameters (such as control coordinates) of the computerized monitoring and control system (CMCS) intended for use with this MR. Application of the CMCS with the proposed functional structure allows substantially increasing the accuracy of the MR monitoring and control, which in turn provides for a considerable enhancement in the quality and economic efficiency of the operations on processing of large ferromagnetic surfaces.
Conceptual model of project management for robotic water area clearing from underwater potentially hazardous objects
(2018) Hrytsaienko, Maksym H.; Грицаєнко, М. Г.
Антотація. Сформульовано науково-прикладне завдання управління проектами очищення акваторій від підводних потенційно небезпечних об’єктів. Реалізацію завдання пропонується виконувати шляхом застосування засобів морської робототехніки. Розроблено узагальнену концептуальну модель управління проектами роботизованого очищення акваторій на основі єдиного інформаційного простору проекту. Модель створена як чотирирівнева структура. Кожний рівень реалізується відповідними засобами морської робототехніки і пов’язаний з іншими за допомогою системи інформаційного обміну.
Creating an online platform for managing joint educational programs with foreign partners
(2018) Ryzhkov, O. S.; Ryzhkov, R. S.; Рижков, О. С.; Рижков, Р. С.
Distance education is the ideal solution for professionals who want to continue their careers. This makes it possible to obtain an additional qualification and save the current job. Distance learning programs can be the key to the career and promotion through a flex¬ible schedule and resources that are available on the Internet. During globalization and the rapid technology development, the functioning of the university as a full-fledged player of the international market cannot be imagined without the use of distance learning methods. The modern online platform “WeStudy” has been developed for the Ukrainian market of edu-cational services. The issues of using modern information and communication technologies are examined in order to improve the quality of educational services in the implementation of joint Ukrainian-Chinese projects. The programs between the Admiral Makarov National University of Shipbuilding and its two partners - Zhejiang University International College and Jiangsu University of Science and Technology are taken as a pilot.
Devices for maintenance of comfortable working conditions in floating docks
(2018) Korol, Yu. M.; Liubytska, N. G.; Король, Ю. М.; Любицька, H. Г.
The towing resistance of the projects AVP 07, AVP 07m, AVP 09 and AVP 11 has been studied in accordance with the needs of Artel LLC. The AVP 07m differs from the AVP 07 by the shape of the bottom at the aft end; thus, the impact of this shape on resistance is assessed. For the AVP 09 with non-standard, simplified contours, its towing resistance is esti¬mated and its performance characteristics are defined. For the AVP 11 project, the effect of lat¬eral clearance on its towing resistance is studied. The main research method is CFD modeling.
Devices for maintenance of comfortable working conditions in floating docks
(2018) Shchedrolosiev, O. V.; Uzlov, O. M.; Konovalova, H. V.; Kyrychenko, K. V.; Щедролосев, О. В.; Узлов, О. M.; Коновалова, Г. В.; Кириченко, К. В.
Classification of ice-retaining devices has been presented; they allow docking vessels when there is a lot of ice in the water area. Schemes of the devices designed for closing the ends of floating docks are provided. They reduce the amount of draughts on the pontoon deck, which is especially relevant throughout cold autumn, partly winter, and spring. Schemes of the staff structures of dock scaffoldings are presented; the requirements for them are also described.
Emergency modes of marine tethered systems
(2018) Trunin, Kostiantyn S.; Трунін, К. С.
Анотація. Розглянуто аварійні режими морських прив’язних систем (МПС), що мають у своєму складі гнучкий зв’язок (ГЗ). Розроблено класифікацію аварій і аварійних режимів МПС і ГЗ, що дає можливість більш повно визначити умови, що призводять до аварійних випадків і аварійних режимів МПС, які можливі в умовах їхнього функціонування, а також перейти до моделювання аварійних режимів роботи МПС із ГЗ.
Heat transfer inside the rough-walled tubular channels of power plant elements
(2018) Kuznetsov, V. V.; Кузнецов, В. В.
Tubular channels with rough walls are now widely used for the formation of heat transfer surfaces of heat exchangers, which must meet the technical and economic requirements for power plants. Among these requirements, intensity and compactness are the main ones. The implementation of these requirements is possible with the intensification of heat transfer processes in a confined space. As shown by prior studies, the intensification of heat transfer on rough surfaces is based on a complex analysis of the effect of roughness in geometric parameters and thermophysical properties of heat agents on their efficiency. At the same time, the results of these studies are limited to the investigated heat agents, as well as the relative roughness heights. To compare the results of experimental studies on heat transfer, a generalized mathematical expression is derived on the basis of the Lion equation. It is intended for determining the heat transfer coefficient of rough surfaces taking into account the influence of velocity distribution on temperature drop in the turbulent core of the flow and the dependence of thickness of the viscous sublayer on the flow mode. The height is determined as the key factor of roughness. Surface roughness is divided into technical and regular. Comparison of the obtained solution to the available experimental data on heat transfer in technically rough pipes showed a difference in the results up to 10%, while in pipes with a regular roughness the divergence did not exceed 14%.
Implementation of the compensated operation mode of a synchronous generator with direct and transverse axis excitation
(2018) Podymaka, V. I.; Novogretskyi, S. N.; Подимака, В. І.; Новогрецький, С. М.
The article considers the possibility of putting a synchronous generator into a compensated mode by controlling excitation in the transverse axis. In this mode, the transverse armature reaction is completely compensated by the magnetizing force of the transverse excitation winding, the rotor torque angle is maintained at zero level, and the transverse component of the load current vector is its active component. It is shown that introduction of a positive feedback in the transverse excitation axis on the active component of the load current is sufficient in order to provide for this mode. At the same time, only proportional control of the generator’s armature voltage needs to be implemented for the direct excitation axis. Abandoning feedback on the reactive component of the armature current enables a more efficient damping of electromechanical oscillations in the system. As revealed by the study of the equation of dynamic equilibrium of the generator, oscillations of the rotor torque angle are damped at the use of the specified control method and at a loading angle below the critical value. The ratio of the magnetizing excitation forces and the transverse axis armature reaction has been analyzed, which allowed obtaining an analytical dependence of the feedback coefficient for the active component of the load current on the inductive resistance of the armature phase and geometric data of the generator.
Improvement of the mathematical model for spatial motion of a remotely operated underwater vehicle with technological equipment
(2018) Korytskyi, V. I.; Корицький, В. І.
Full-scale sea experiments of underwater vehicles and their automated control systems are an expensive and labor-intensive process. Moreover, execution of such experiments is always accompanied with the risk of damaging the components of an underwater vehicle or even injuring its crew. Thus, it is relevant to minimize the time of configuring automatic control systems of underwater vehicles through computer simulation. This paper considers advanced approaches to motion dynamics simulation for underwater vehicles with technological equipment. There is substantiated the necessity of developing a specialized mathematical model of a tethered remotely operated underwater vehicle with technological equipment. The proposed mathematical model accounts for an underwater vehicle that is organized according to the principle of separation of progressive motion of its hull and rotary motion of its technological equipment. The mathematical model of the rotary motion platform is designed; it considers the influence of disturbances arising from the technological equipment on the dynamics of its motion. The developed mathematical model will be used during the design and preliminary configuration of the automated control system for an underwater vehicle and its technological equipment.
The mathematical model of resonant frequency converter with pulse regulation
(2018) Pavlov, H. V.; Vinnychenko, I. L.; Павлов, Г. В.; Вінниченко, І. Л.
On the basis of the state variables method, the mathematical model of the resonant converter is constructed, within which the analytical dependences are obtained, which allow calculating the durations of the inter-commutation stages, the certain sequence of which provides the sinusoidal shape of the carrier pulses. The article aim is to study electromagnetic processes in the power section of the resonant frequency converter with pulse control and to obtain the analytical expressions for the durations of the inter-commutative stages of the converter operation. With the usage of the state variables method, the solutions of vector-matrix equations, which describe the processes in the power section of the resonant frequency converter, were obtained. That made possible to get the exact shape of the resonant voltage and current pulses and determine the durations of the inter-commutation stages, which provide their shape, characterized with the low THD. The phase characteristic of the converter operation cycle is constructed as well. The results of the research can be applied in the development of the pulse frequency converters control systems. The obtained analytical expressions allow computing the required switching moments of the converter power transistors.
Mathematical modeling of the automatic control system for an autonomous underwater vehicle as a group agent
(2018) Burunina, Z. Yu.; Aloba, L. T.; Hrudinina, H. S.; Буруніна, Ж. Ю.; Алоба, Л. Т.; Грудініна, Г. С.
A mathematical model of the automatic control system for an autonomous unmanned underwater vehicle operating as a group agent has been developed. The ACS was modeled in the MATLAB Simulink software. There has been carried out the simulation of the maneuvering motion of the AUUV, in which the device maintained at a safe distance from the given agent (object of the group) in the specified distance range: the adhesion mode, or the cohesion mode. The proposed control system contains two major control units: the distance control unit and the course control unit. For the implementation of the task, fuzzy controllers of the Mamdani-type were chosen, with defuzzification via the Center of Gravity method.
Methods to improve the performance of diesel engines by adding hydrogen into high pressure line
(2018) Tkach, M. R.; Tymoshevskyy, B. G.; Shalapko, D. O.; Proskurin, A. Yu.; Mytrofanov, O. S.; Ткач, М. Р.; Тимошевський, Б. Г.; Шалапко, Д. О.; Проскурін, А. Ю.; Митрофанов, О. С.
One way to improve the efficiency of diesel engines is the addition of hydrogen (0.2 ... 2.0 % by weight) to the main diesel fuel. An addict of hydrogen to the fuel line between the high pressure fuel pump (HPFP) and nozzle. This achieved by reducing specific fuel con¬sumption at 0,4... 2,8%.
Natural potential of maritime economy: essential features and valuation
(2018) Parsyak, V. N.; Parsyak, K. V.; Парсяк, В. Н.; Парсяк, К. В.
The growth of unsatisfied needs and gradual decline of natural resources on the continents will inevitably lead the mankind to the coasts of the World Ocean with its natural potential being enormous up to the present day. That is why the author has systematized and described the essence of its key elements: natural conditions and natural resources. Consequences of the careful use of natural resources as part of the state policy are revealed. Favorable natural conditions for the development of the maritime economy in Ukraine are highlighted. Top-priority measures to be taken to achieve this goal are outlined. Furthermore, there is a detailed review of the approaches and methods for the valuation of the marine natural potential, namely, the cost method, successful efforts method, rental method, rates and norms method, and lost profit method. The paper also demonstrates the areas of their application and limitations to their use.
Refining the classification of underwater missions performed using underwater complexes withflexible connections
(2018) Blintsov, O. V.; Burunina, Z. Yu.; Voitasyk, A. M.; Блінцов, О. В.; Буруніна, Ж. Ю.; Войтасик, А. М.
The concept “underwater complex with flexible connections” has been introduced to the field of marine robotics. Advanced underwater technologies that are implemented with the help of underwater vehicles and complexes with flexible connections are considered, and the main features of their operation are established. The existing systems for classification of tethered underwater vehicles are supplemented with classification features that take into account basic underwater technologies, surface conditions for underwater works, characteristics of underwater space, and intended purpose.
Risk management model for the selection of manufacturers of plasma equipment for power systems
(2018) Burunsuz, K. S.; Бурунсуз, К. С.
The article presents analysis of previous studies which defines the aspects of selection of technical equipment manufacturers. The available criteria for the manufacturer assessment are rendered. The study implements the practices for the selection of plasma equipment manu-facturers at the execution of various projects. There has been developed a model for managing the risks arising at the selection of plasma equipment manufacturers in the projects aimed at creation of plasma-chemical elements. The article then considers the major blocks of the risk management model for the selection of plasma equipment manufacturers within the projects aimed at creation of plasma-chemical elements. There are provided the criteria for the selection of plasma equipment manufacturers that can be used by the project team. The most probable indicators of plasma systems used to select potential manufacturers are defined. The study also considers the main steps of testing the manufacturer’s qualification prior to establishment of a contract. At last, the criteria for assessment of plasma equipment manufacturers are proposed.
Using metal-plastic windows with energyefficient insulating glass units in thermal modernization of marine infrastructure facilities
(2018) Dolganov, Yu. A.; Yepifanov, O. A.; Долганов, Ю. А.; Єпіфанов, О. А.
The article considers the use of metal-plastic windows with energy-efficient insulating glass in the process of thermal modernization of administrative and public buildings of marine infrastructure facilities. The purpose of the study is to obtain data on the heat flow densities in different types of insulating glass units depending on the temperature drop typical for the climate zone of the southern Ukraine. Mathematical modeling is employed to obtain temperature fields on the outer surface of the insulating glass units. The densities of heat flow through various types of insulating glass units are studied experimentally. Analytic dependencies of the heat flow density on the temperature drop through the window structure are obtained.
Визначення аналітичної залежності параметрів точки максимальної потужності фотоелектричного перетворювача для прогнозування його виробітку прямим інтегруванням
(2018) Баганов, Є. О.; Тимофеєв, К. В.; Baganov, Yevgen A.; Tymofeiev, Kostiantyn V.
Анотація. В роботі проведено аналіз п’ятипараметричної моделі фотоелектричного перетворювача (ФЕП). На основі функції Ламберта отримано аналітичну функціональну залежність точки максимальної потужності ФЕП від параметрів сонячного випромінювання та температури прогнозувати кількість виробленої ФЕП енергії прямим інтегруванням без покрокового моделювання.
Керування високовольтними передачами постійного струму на базі повністю керованих напівпровідникових перетворювачів
(2018) Жук, О. К.; Жук, І. Ю.; Жук, Д. О.; Криворучко, Д. В.; Zhuk, O. K.; Zhuk, I. Y.; Zhuk, D. O.; Kryvoruchko, D. V.; Воскобоєнко, К. А.; Voskoboienko, K. A.
Рассмотрены основные виды и направления развития высоковольтных передач постоянного тока (ВППС) и способы их синхронизации, создан обобщенную схему системы управления современными ВППС на базе автономных инверторов напряжения, определены состав и назначение регуляторов, которые составляют основу систем управления ВППС, предложен общий алгоритм определения параметров.
Модельное исследование системы управления фильтрокомпенсирующим устройством с реакторным компенсатором
(2018) Жук, О. К.; Жук, И. Ю.; Жук, Д. О.; Криворучко, Д. В.; Zhuk, O. K.; Zhuk, I. Y.; Zhuk, D. O.; Kryvoruchko, D. V.; Воскобоєнко, К. А.; Voskoboienko, K. A.
Определены условия полной компенсации реактивной мощности нагруз¬ки в автономной электроэнергетической системе (ЭЭС) с мощными полупроводниковыми преобразователями (ИЛ). Предложены принципы построения соответствующей системы управления (СУ) усовершенствованного фильтрокомпенсирующего устрой-ства (УФКУ). Создана и исследована MATLAB-модель системи для оценки эффектив-ности работы СУ УФКУ.

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