Dissertations / Theses on the topic 'Функції перетворення'
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Корогод, Г. О. "Математичне моделювання нелінійної функції перетворення із застосовуванням надлишковості." Thesis, Київський національний університет технологій та дизайну, 2020. https://er.knutd.edu.ua/handle/123456789/16481.
Full textКорогод, Г. О. "Моделювання методів надлишкових вимірювань при кубічній функції перетворення." Thesis, Київський національний університет технологій та дизайну, 2019. https://er.knutd.edu.ua/handle/123456789/14577.
Full textГоркунов, Б. М., Євген Анатолійович Борисенко, and Т. Шібан. "Нормовані функції перетворення під час здійснення вихорострумового контролю." Thesis, Національний технічний університет "Харківський політехнічний інститут", 2018. http://repository.kpi.kharkov.ua/handle/KhPI-Press/46823.
Full textКорогод, Г. О. "Комп’ютерне моделювання і дослідження логарифмічної функції перетворення із застосовуванням надлишковості." Thesis, Київський національний університет технологій та дизайну, 2021. https://er.knutd.edu.ua/handle/123456789/19322.
Full textКорогод, Г. О. "Забезпечення метрологічного самоконтролю при застосуванні методів надлишкових вимірювань." Thesis, Київський національний університет технологій та дизайну, 2018. https://er.knutd.edu.ua/handle/123456789/9681.
Full textЧуніхіна, Тетяна Віталіївна, Д. С. Марданов, В. Ю. Ксьондзов, and І. А. Дивнич. "Сучасний стан вирішення задачі довготривалої роботи ТЕП на об'єкті." Thesis, Національний технічний університет "Харківський політехнічний інститут", 2018. http://repository.kpi.kharkov.ua/handle/KhPI-Press/39559.
Full textЧуніхіна, Тетяна Віталіївна. "Підвищення точності первинних перетворювачів температури." Thesis, Національний технічний університет "Харківський політехнічний інститут", 2016. http://repository.kpi.kharkov.ua/handle/KhPI-Press/47529.
Full textПревисокова, Н. В. "Міжсистемні перетворення функцій та кодових систем." Thesis, Видавництво СумДУ, 2006. http://essuir.sumdu.edu.ua/handle/123456789/22482.
Full textМатусов, Ю. П. "Оцінки лінійних перетворень випадкових функцій в стохастичній оптимізації." Diss. of Candidate of Physical and Mathematical Sciences, Національний технічний ун-т України "Київський політехнічний інститут", 2009.
Find full textКлобуков, Віталій Віталійович, Vitalii Klobukov, and Виталий Виталиевич Клобуков. "Метод підвищення ефективності роботи допплерівського вимірювача швидкості на етапі обробки вхідного сигналу." Thesis, Національний авіаційний університет, 2021. https://er.nau.edu.ua/handle/NAU/52290.
Full textВ диссертационной работе решается актуальная научно-техническая задача по разработка алгоритма оценки частоты дискретно-экспоненциального сигнала, основанного на спектральном анализе в базисе функций Виленкина - Крестенсона, и также оценки эффективности этого метода и сравнение его с эффективностью метода, основанного на быстром преобразовании Фурье в базисе дискретно-экспоненциальных функций. В работе: впервые разработан алгоритм формирования дочерних симметричных базисных систем, который в отличие от существующих связывает дискретно-экспоненциальной функции, функций Уолша и функций Виленкина - Крестенсона; впервые предложена методика вычисления значений порогов решения при приеме сигнала на фоне односвязного марковского шума, в базисах Виленкина - Крестенсона и дискретно-экспоненциальной функции, которые обеспечивают необходимые вероятностные характеристики оценки частоты сигнала; впервые предложен метод изоморфного представления дискретных базисов Виленкина - Крестенсона, что позволило перейти от комплексно-значных компонентов базиса к их модулярных целочисленных эквивалентов, существенно упростило как анализ, так и синтез алгоритмов обработки сигналов в этих базисах; впервые предложен метод индикаторных матриц, позволяет синтезировать полную множество базисов Виленкина - Крестенсона (в том числе и базисов Уолша) с заданными параметрами, а также исключить процедуру факторизации матриц Виленкина - Крестенсона и Уолша при синтезе алгоритмов быстрого преобразования Фурье в этих базисах. Практическое значение полученных результатов заключается в: разработке метода оценки дисперсии квадратур гармоник при спектральном анализе коррелированного шума в различных базисах .; разработаны алгоритма оценки частоты доплеровского сигнала методом спектрального анализа в базисах Виленкина - Крестенсона.
The dissertation solves the current scientific and technical problem of developing an algorithm for estimating the frequency of a discrete exponential signal based on spectral analysis in the basis of Vilenkin - Crestenson functions, as well as evaluating the effectiveness of this method and comparing it with the efficiency of the method based on fast Fourier transform. discrete-exponential functions. In the work: for the first time an algorithm for the formation of child symmetric basis systems was developed, which, in contrast to the existing ones, connects discrete-exponential functions, Walsh functions and Vilenkin-Crestenson functions; for the first time the method of calculation of values of decision thresholds at reception of the signal accepted against one-connected Markov noise in Vilenkin - Crestenson bases and discrete-exponential functions which provide necessary probabilistic characteristics of an estimation of frequency of a signal is offered; for the first time a method of isomorphic representation of discrete Vilenkin - Crestenson bases was proposed, which allowed to pass from complex-significant components of the base to their modular integer equivalents, which significantly simplified both analysis and synthesis of signal processing algorithms in these bases; The method of indicator matrices was proposed for the first time, which allows to synthesize a complete set of Vilenkin - Crestenson bases (including Walsh bases) with given parameters, and to exclude the factorization procedure of Vilenkin - Crestenson and Walsh matrices in the synthesis of fast Fourier transform algorithms in these Fourier transform bases. The practical significance of the obtained results is: development of a method for estimating the variance of harmonic quadratures in the spectral analysis of correlated noise in different bases .; developed algorithms for estimating the frequency of Doppler signal by spectral analysis in the bases of VKF.
Вітрук, Ю. В., and Я. І. Рубан. "ЗАСТОСУВАННЯ ВЕЙВЛЕТ-ПЕРЕТВОРЕННЯ ДЛЯ ВИЗНАЧЕННЯ ДІАГНОСТИЧНИХ ОЗНАК ПРИ НЕРУЙНІВНОМУ КОНТРОЛІ МЕТОДОМ ВІЛЬНИХ КОЛИВАНЬ." Thesis, Академія метрології України, 2016. http://er.nau.edu.ua/handle/NAU/25760.
Full textХудоба, Василь Олегович. "Метод та засоби тестування криптографічних алгоритмів на основі булевих перетворень." Master's thesis, КПІ ім. Ігоря Сікорського, 2021. https://ela.kpi.ua/handle/123456789/46086.
Full textThe purpose of the master's thesis is to increase the efficiency of testing cryptographic resistance to hacking of data protection algorithms, which are based on Boolean functional transformations, by accelerating the process of determining important for cryptographic stability characteristics of Boolean transformations. To do this, the following tasks were set and solved: review of methods of testing cryptographic algorithms. conducting analytical analysis and comparative evaluation of existing ways to accelerate the determination of nonlinearity of Boolean functional transformations and conducting statistical evaluation of satisfaction of the avalanche effect criterion. theoretical substantiation and research of a new way to improve the efficiency of testing cryptographic algorithms based on Boolean functional transformations. development of a program for research of the proposed method comparative evaluation of the proposed method with existing methods.
Зубрецька, І. С. "Аналіз методів апроксимації експериментальних даних при побудові градуювальних характеристик ЗВТ." Thesis, Київський національний університет технологій та дизайну, 2017. https://er.knutd.edu.ua/handle/123456789/8416.
Full textВигівська, Л. В. "Оцінки добутку внутрішніх радіусів симетричних неперетинних областей." Thesis, Київський національний університет технологій та дизайну, 2019. https://er.knutd.edu.ua/handle/123456789/13898.
Full textЛавриненко, Олександр Юрійович, Александр Юрьевич Лавриненко, and Oleksandr Lavrynenko. "Методи підвищення ефективності семантичного кодування мовних сигналів." Thesis, Національний авіаційний університет, 2021. https://er.nau.edu.ua/handle/NAU/52212.
Full textThe thesis is devoted to the solution of the actual scientific and practical problem in telecommunication systems, namely increasing the bandwidth of the semantic speech data transmission channel due to their efficient coding, that is the question of increasing the efficiency of semantic coding is formulated, namely – at what minimum speed it is possible to encode semantic features of speech signals with the set probability of their error-free recognition? It is on this question will be answered in this research, which is an urgent scientific and technical task given the growing trend of remote human interaction and robotic technology through speech, where the accurateness of this type of system directly depends on the effectiveness of semantic coding of speech signals. In the thesis the well-known method of increasing the efficiency of semantic coding of speech signals based on mel-frequency cepstral coefficients is investigated, which consists in finding the average values of the coefficients of the discrete cosine transformation of the prologarithmic energy of the spectrum of the discrete Fourier transform treated by a triangular filter in the mel-scale. The problem is that the presented method of semantic coding of speech signals based on mel-frequency cepstral coefficients does not meet the condition of adaptability, therefore the main scientific hypothesis of the study was formulated, which is that to increase the efficiency of semantic coding of speech signals is possible through the use of adaptive empirical wavelet transform followed by the use of Hilbert spectral analysis. Coding efficiency means a decrease in the rate of information transmission with a given probability of error-free recognition of semantic features of speech signals, which will significantly reduce the required passband, thereby increasing the bandwidth of the communication channel. In the process of proving the formulated scientific hypothesis of the study, the following results were obtained: 1) the first time the method of semantic coding of speech signals based on empirical wavelet transform is developed, which differs from existing methods by constructing a sets of adaptive bandpass wavelet-filters Meyer followed by the use of Hilbert spectral analysis for finding instantaneous amplitudes and frequencies of the functions of internal empirical modes, which will determine the semantic features of speech signals and increase the efficiency of their coding; 2) the first time it is proposed to use the method of adaptive empirical wavelet transform in problems of multiscale analysis and semantic coding of speech signals, which will increase the efficiency of spectral analysis due to the decomposition of high-frequency speech oscillations into its low-frequency components, namely internal empirical modes; 3) received further development the method of semantic coding of speech signals based on mel-frequency cepstral coefficients, but using the basic principles of adaptive spectral analysis with the application empirical wavelet transform, which increases the efficiency of this method. Conducted experimental research in the software environment MATLAB R2020b showed, that the developed method of semantic coding of speech signals based on empirical wavelet transform allows you to reduce the encoding speed from 320 to 192 bit/s and the required passband from 40 to 24 Hz with a probability of error-free recognition of about 0.96 (96%) and a signal-to-noise ratio of 48 dB, according to which its efficiency increases 1.6 times in contrast to the existing method. The results obtained in the thesis can be used to build systems for remote interaction of people and robotic equipment using speech technologies, such as speech recognition and synthesis, voice control of technical objects, low-speed encoding of speech information, voice translation from foreign languages, etc.
Коржов, Ігор Михайлович. "Пристрій контролю та діагностування стану промислових динамічних об’єктів." Thesis, Національний технічний університет "Харківський політехнічний інститут", 2019. http://repository.kpi.kharkov.ua/handle/KhPI-Press/43360.
Full textThe thesis is submitted to obtain a scientific degree of Doctor of Philosophy, specialty 152 – Metrology and information-measuring technique (15 – Automation and instrument-making). – National Technical University “Kharkiv Polytechnic Institute”, Kharkiv, 2019. The object of research is the process of conducting analysis in primary and secondary system transformations of information, which creates a problem situation with the improvement of hardware, algorithmic and software devices for control and diagnostics of complex industrial objects. The subject of research is a device for control and diagnostics of the state industrial dynamic objects. The scientific and practical task of increasing the efficiency of devices for control and diagnostics of the state of complex industrial objects with uncertain dynamic properties is solved in the dissertation. The solution is found using both classical and fundamentally new modern methods of probability theory, random processes, multivariate statistical analysis, information theory of measurement and control. The introduction substantiates the relevance of research tasks showing connection between the work and scientific programs, plans, themes, the scientific novelty is stated and practical value of the obtained results is formulated. The first chapter deals with analytical review and evaluation of questions in the field of control and diagnostics of the state of industrial objects. The object of diagnostics is selected; its structure, technical characteristics and area of use are considered. The analysis of methodical, algorithmic and equipment-specific devices for measuring temperature and mechanical vibration is carried out. A review of the existing devices for control and diagnostics of the state of complex industrial objects is made, their technical and economic characteristics are analyzed, and the optimal structure of the control and diagnostic system is selected. Some aspects of hardware, software and algorithmic programming when creating devices for control and diagnostics of the state of complex industrial objects are emphasized. The areas of research are selected; the main tasks of the dissertation are stated. The second chapter studies probabilistic models of parametrization of spectral changes of stationary measurement signals. The formalization of the probabilistic properties of non-stationary random signals is made, the correlation models of the spectral non-stationary of these signals are investigated, the dispersion analysis of frequency and time models of auto-coherence is carried out, the sensitivity of the correlation spectral model for the auto-coherence indicator of the multidimensional thermodynamic process is estimated, the discriminating properties of the indicators of auto-coherence are assessed regarding the classification of vibrational processes, diagnostic properties of components of the auto-coherence index are investigated, the choice of indicators for non-stationary control of dynamic processes is conducted. The research results have allowed obtaining a number of scientific results: - the theory of auto-coherence for spectrally non-stationary measurement signals has been developed. The conditions of the choice of the number of scales and displacements are determined regarding the estimation of the auto-coherence coefficients for monitoring the stationary disturbances of the measuring signal; - the conditions of calibration of auto-coherence index, which correspond to the absence of stationary violation, are obtained. A probabilistic model of the autocoherence index taking into account the minimum value (scale) of the spectral wavelet transform is developed; - the possibility of dispersion expansion of the basic auto-coherence index in paired independent components is shown, allowing to receive independent information on stationary violation, taking into account functional and random changes of the spectrum; - the example of thermal dynamic processes shows the efficiency of the developed autocorrelation index for controlling the dynamic properties of inertial multidimensional industrial objects. Also the possibility of automatic correction of the measurement error of temperature, if you control the whole heat process, and not its individual values, is shown; - the example of vibration signals shows the possibility of a qualitative classification of technical states, as well as quantitative classification of individual frequency-time components of the auto-coherence index is shown. It is proved that the best diagnostic properties are characterized by random (noise) components of the auto-coherence index. The third chapter presents studies on the diagnostic properties of autocoherence indices with restrictions on the measurement information volume. The general task of functional diagnostics of dynamic industrial objects is formulated, the model of parametric discrimination is chosen, the influence of the study sample size on the average risk of diagnosing is investigated, and mathematical and computer models of optimization of the space of informative signs by the criterion of maximum likelihood were created and their research was conducted. The researches in this chapter have allowed obtaining the following results: - experimental studies of the auto-coherence indices of vibration signals show that it is possible to use a linear solving function for controlling and diagnosing the technical state of vibrational objects, for which it is possible to use dispersion tables of auto-coherence indices and a normalized covariance matrix, which allow to generate, by multiplication, a total covariance matrix; - equations for the average risk and diagnostics probability are obtained allowing to model the influence of the training sample volume and informative features number on the performance indicators of the technical condition; - the existence of minimal extreme values of average risk for thermal and vibrational objects has been proved, allowing to use average risk as a target function for optimizing informative features space; - the complex influence of three parameters (geometric distance between diagnosed states, number of informative parameters, training sample volume) on the probability of control and diagnostics of the technical state of both thermal and vibration objects is studied. Such research has proven the ability to form an optimal, maximum control probability, system of informational features. The fourth chapter is devoted to the development of algorithmic and software device for monitoring and diagnosing the state of industrial objects. The methods of primary and secondary statistical transformations based on regression, spectral, dispersion and covariance analyses of the control and diagnostic device, have allowed to form the structure and the principle of algorithmic support functioning while limiting the volumes of measuring information by the diagnosed functional states. In this chapter the software aimed at implementation of the developed algorithms is chosen, programs fragments of devices for control and diagnostics of the state of industrial objects on the platform LabView are developed. According to researches of this chapter the following results are obtained: - the algorithmic structure of control devices and diagnostics of dynamic objects is developed, which consists of primary and secondary statistical transformation and contains the implementation of sampling processes of measurement signals, discrete analog wavelet transformation, differentiation and integration procedures; - an adaptive wavelet transform process with a flexible choice of the Gaussian parent wavelet is implemented, which minimizes the errors of control and diagnostics. - computer components of algorithmic and software procedures of primary and secondary statistical transformation in the synthesis of computerized diagnostic systems are formed, simulation modeling is conducted, the effects of destabilizing factors when controlling parameters of dynamic objects nodes are analyzed and their states are diagnosed; - the device software for controlling and diagnosing the state of industrial objects on the LabView platform with the use of object-oriented programming language, which allows to carry out the necessary control procedures in batch mode and in real-time, is developed.The fifth chapter presents engineering applications for the control and diagnostics of complex industrial objects. The research is provided for the development and patenting of primary transformers, selecting and patenting the structure of measuring channels of primary transformers, the development and creation of electronic blocks of primary and secondary transformation of information. The method of calibration of vibration test stands for metrological provision of primary vibration transducers is proposed, the verification of qualification of calibration laboratories in Ukraine and the influence of metrological support on the creation of systems of control and diagnosis of complex industrial objects are considered. According to researches of this chapter the following results are obtained: - primary temperature transducers for monitoring infra-low frequency processes in the investigated industrial object when evaluating thermal regimes, as well as primary transducers of mechanical vibration for monitoring high-frequency processes when evaluating rolling bearings condition of gear reducers are developed and patented; - on the basis of the Arduino microcontroller, a device for monitoring and diagnosing the condition of the extruder heating zones for manufacturing thermoplastics and the rolling bearings condition of gear reducers is created; - metrological researches of devices for measurement of infra-low frequency and high-frequency measuring signals are conducted, the vibration testing devices are implemented, and calibration methods of these devices are developed. - prospects for development of the theory and practice of control and diagnostics of processes characterized by different frequency indices in the specialized metrological laboratories are presented.
Главчев, Дмитро Максимович. "Моделі, методи та програмні компоненти комп'ютерної системи тягового рухомого складу." Thesis, Національний технічний університет "Харківський політехнічний інститут", 2020. http://repository.kpi.kharkov.ua/handle/KhPI-Press/48901.
Full textThe thesis is submitted to obtain a scientific degree of Doctor of Philosophy, specialty 123 – Computer Engineering – National Technical University “Kharkiv Polytechnic Institute” , Kharkiv, 2020. The object of the research is the processes of managing the traction rolling stock with the help of an on-board computer system used in the DEL-02 series diesel trains. The subject of research are models, methods and corresponding software components used in the computer system of traction rolling stock, which extend the using scope of geometric control theory for the synthesis of optimal controls of rolling stock, as well as methods and tools for the development of modern software complexes in the development of computer decision support systems of the diesel train driver of the DEL-02 series trains. The introduction focused and explained on the relevance of the topic being researched, shows the relationship with scientific programs, plans and topics, presents the scientific novelty, as well as formulates the practical significance of the results. The first section provides an analytical overview of models, methods and software components used in computerized decision support systems of the diesel train driver and train control systems. The peculiarities of the structure and peculiarities of using such systems on rail transport in Ukraine and in the world (China, India, Germany, CIS countries) are considered. On the example of the operation of such systems considered their structure, specifications, applications and features of use. The first section also deals with the mathematical model of a control object, an example of a method of linearization of a given mathematical model, a method of finding transform functions that relate variables of linear and nonlinear mathematical models. Also, the possibility of using neural network associative memory in control systems was considered and methods of synthesis of optimal control systems were analyzed. As a result, the main directions of research were selected and the main tasks of the dissertation were set. In the second section, the question of converting nonlinear mathematical models into equivalent linear mathematical models in the form of Brunovsky was considered. Also, methods of simplifying analytical transformations during the linearization process by converting to a linear kind of nonlinear systems with different numbers of monomials in the right-hand sides of the differential equations of the initial object, as well as separating the linear equation from the other part of the system of equations, were considered. These methods were verified by modeling the motion along the path of the initial object in the form of a nonlinear system of differential equations and the object transformed into a linear Brunovsky form, with further comparison of the results obtained, which showed coincidence, which indicates that in the case of using this the linearization method allows to obtain a linear mathematical model that is completely equivalent to the original non-linear model. Additionally, linearization of a more complex nonlinear mathematical model describing the operation of a train with two separate engines was performed, and the verification of the results of the linear model simulation showed complete equivalence to its original form. Research results have yielded a number of scientific results: − dependence of quantity and complexity of calculations during linearization and search of transformation functions on the number of monomials in the right part of equations of nonlinear mathematical model is determined; − two new methods of finding transform functions are proposed that relate variables of linear and nonlinear models that extend the scope of geometric control theory to objects whose right-hand sides of differential equations contain more than two monomials; − was proposed a method of reducing the number of calculations when performing linearization by separating a linear equation from the system; − this method was tested, which showed its workability on more complex mathematical models, in particular, on a model that describing the operation of a train using two equivalent motors. In the third section of the paper, the question of creating a new method for finding functions of transformation using neural networks was considered. In this section proposes a new neural network that can be used to search for conversion functions. In addition, this section proposes a new tabular method of finding conversion functions, which is simple and clear and can be used to get results when performing the calculation process. The studies conducted in this section have yielded the following scientific results: − a new neural network has been created and proposed for searching the conversion functions that relate variables to nonlinear and linear models of a control object, which in turn widens the scope of geometric control theory; − a new tabular method for finding conversion functions is proposed, which is simple enough to understand and sufficiently visual. In this context, it is proposed to present a system of partial differential equations with constraints in the form of differential inequalities in the form of a corresponding table, which allows to visualize the dependence of transformation functions on arguments, as well as to form systems of linear homogeneous equations by which it is possible to narrow the search area of conversion functions. The fourth section focuses on the software components of the on-board computer system, as well as the developed software that extends the scope of geometric control theory. Specifically, shows with new functionality of designed software and describes its main characteristics and structure. In the framework of the description of the developed software, special attention is paid to the structure and description of the operation of individual functional blocks of the program, the development of the interface structure, the reliability of the software, components for solving control problems using geometric control theory, evaluation of the quality of the software. Also, this section gives an example of how the developed software works. In addition, this section presents the results of solving the problem of optimal motion of the diesel train along the route of its direction, in which the simulation of the train movement along the route was performed and the comparison of the obtained data with the data of the movement of the real train, as well as an attempt to improve the efficiency of train movement due to the optimization of individual sets of routes, taking into account the features of the route. The following scientific results have been obtained within this section: − new software has been developed that has been further developed through the use of modern programming languages. The developed software is more stable due to the testing unit, more convenient due to the created graphical user interface, more functional, because it can perform the process of linearization and search of conversion functions, many of the functionality are automated, there are comments and an explanation that increases the ease of use of this software, in addition, the characteristics of the program meet the requirements of the standard of program quality; − the study of the dependence of the amount of fuel consumed during train movement on the features of terrain, the style of running the train and its schedule; − a method of reducing the amount of fuel consumed was proposed and tested, using terrain features, permissible lag or advance of the train timetable, as well as determining the optimal driving style for the route as a whole and for its individual parts; − the train simulation was performed on a real route, and the results showed that the simulation was correct, because it was compared to the real train running on this route. Therefore, the dissertation is devoted to the solution of the scientific-applied problem, namely, the development of models, methods and software components of the computer system of traction rolling stock, which is created on the basis of generalized mathematical models, developed software, as well as the means of optimizing the control of moving objects new methods, as well as the use of a new neural network structure to search for transformation functions, which made it possible to extend the scope of geometric control theory it breeds the preconditions for developing automatic train control systems and improves performance related to energy consumption. The advanced diesel train model takes into account the main types of interaction between the train and the track profile, namely, turns, slopes, as well as the performance of the train engines, which adequately reflects the processes in real diesel train. Specialized software has been created that has a graphical user interface and complies with software quality assessment requirements. This software implements an advanced structure of the human-machine system, makes it possible to perform automation of analytical transformations of geometric control theory to the form of Brunovsky. The new neural network structure is based on ART-type neural networks to solve multiple-choice tasks. This made it possible to develop a new method of finding transform functions that relate variables of nonlinear and linear models in the form of Brunovsky. To increase the efficiency of the linearization process, several methods have been proposed to simplify the calculation process by reducing the number of elements in the right-hand side of the initial differential equation system, and by separating the first equation, which itself is linear, from the general system of equations. The performed research and development allowed to improve the structure of the on-board computer system of decision support of the driver of the diesel train, which allowed, under real conditions of movement of the dynamic object, during changes of road conditions, to perform recalculations and to give the driver new control laws which will allow to continue the movement on the route adhering to the timetable and minimum cost of fuel and energy resources. Appropriate researches were conducted on real object and mathematical models. The results of the researches confirmed the correctness of the used tools, methods and algorithms, on the basis of which the appropriate solutions that formed the basis of the developed software were proposed.
Маляренко, Марина Леонідівна. "Перетворення системи Гаара під дією оператора множення на функцію у просторі L2[0, 1]." Магістерська робота, 2020. https://dspace.znu.edu.ua/jspui/handle/12345/2565.
Full textUA : Робота викладена на 53 сторінках друкованого тексту, містить 8 рисунків, 16 джерел, 1 додаток. Об’єкт дослідження: ортонормована система Гаара гільбертового простору L2[0, 1]. Мета роботи: дослідити властивості оператора множення на деяку неперервну функцію та дію цього оператора на ортонормованій системі Гаара гільбертового простору L2[0, 1]. Метод дослідження: аналітичний. У кваліфікаційній роботі розглядається ортонормована система Гаара простору. Досліджуються властивості оператора щільного вкладення, в якості якого вибрано оператор множення на неперервну функцію. Аналізуються властивості перетвореного базису та його підпослідовностей. Побудовано приклад ортонормованого базису, який залишається безумовним базисом під дією оператора L2[0, 1].
EN : The work is presented on 53 pages of printed text, 8 figures, 16 references, 1 supplement. The object of the study is the orthonormalised Haar system of the Hilbert space L2[0, 1]. The aim of the study is to study the properties of the operator of multiplication by a continuous function and to investigate the action of this operator on the trigonometric basis of the Hilbert space L2[0, 1]. The method of research is analytical. In the qualifying paper the orthonormalised Haar system in the space is L2[0, 1] considered. The properties of the operator of multiplication by a continuous function as a dense imbedding operator are investigated. The properties of transformed basis and its subsequence are analyzed. An example of an orthonormal basis which remains an unconditional basis under the action of an operator is constructed.
Штенгєлов, Віталій Петрович. "Застосування інтегрального перетворення Лапласа до дослідження коливань механічних систем." Магістерська робота, 2020. https://dspace.znu.edu.ua/jspui/handle/12345/3078.
Full textUA : Робота викладена на 61 сторінці друкованого тексту, містить 2 рисунка, 11 джерел. Об’єкт дослідження: коливання струни під дією миттєвих поштовхів. Мета роботи: визначення переміщень точок струни у коливальних процесах, що виникають під дією миттєвих поштовхів. Метод дослідження: операційний. У даному магістерському дослідженні розв’язана задача про коливання струни під дією миттєвих поштовхів за допомогою інтегрального перетворення Лапласа. При цьому розглянуті коливання напівнескінченної струни під дією миттєвих поштовхів, а також аналогічні коливання скінченної струни для випадків наявності та відсутності тертя. Отримано функціональні залежності переміщень точок струни від просторової координати та часу.
EN : The work is presented on 61 pages of printed text, 2 figures, 11 references. The object of the study is oscillation of the string under the influence of instant shocks. The aim of the study is to determine the displacement of the points of the string in the oscillatory processes that occur under the influence of instantaneous shocks. In this study the problem of the oscillation of a string under the action of instantaneous shocks by the integral Laplace transform is solved. In this case, the oscillations of a semi-infinite string under the action of instantaneous shocks, as well as similar oscillations of a finite string for cases of presence and absence of friction, are considered. Functional dependences of the displacement of the points of the string on the spatial coordinate and time are obtained.
Олексієнко, Владислав Андрійович. "Застосування операційного методу для дослідження нестаціонарних процесів." Магістерська робота, 2020. https://dspace.znu.edu.ua/jspui/handle/12345/3471.
Full textUA : Робота викладена на 58 сторінках друкованого тексту, містить 12 джерел. Об’єкт дослідження: коливання струни під дією миттєвих поштовхів. Предмет дослідження: коливальні процеси одновимірних обʼєктів. Мета роботи: визначення переміщень точок струни у коливальних процесах, що виникають під дією миттєвих поштовхів. Методи дослідження: методи аналізу (аналіз інформації вітчизняних та зарубіжних науковців) і синтезу (систематизація інформації), операційний метод (застосування перетворення Лапласа). У кваліфікаційній роботі магістра розглянуто особливості застосування інтегрального перетворення Лапласа для розвʼязання диференціальних рівнянь у частинних похідних. Розвʼязано задачі про коливання напівнескінченної струни під дією миттєвих поштовхів, а також аналогічні коливання скінченної струни для випадків наявності та відсутності тертя. Застосування інтегрального перетворення Лапласа дозволило звести розвʼязання задач до інтегрування звичайних диференціальних рівнянь. Результати роботи можуть бути використані при викладанні операційного числення, рівнянь математичної фізики, математичного моделювання.
EN : The work is presented on 58 pages of printed text, 12 references. The object of the study is the oscillation of the string under the action of instantaneous shocks. The aim of the study is oscillatory processes of one-dimensional objects; to determine the displacements of string points in oscillatory processes that occur under the action of instantaneous shocks. The methods of research are methods of analysis (analysis of information of domestic and foreign scientists) and synthesis (systematization of information), operational method (application of Laplace transform). The masterʼs thesis considers the peculiarities of the application of the Laplace integral transformation for solving differential equations in partial derivatives. The problems of oscillations of a semi-infinite string under the action of instantaneous shocks, as well as similar oscillations of a finite string for cases of presence and absence of friction are solved. The application of the Laplace integral transformation made it possible to reduce the solution of problems to the integration of ordinary differential equations. The results of the work can be used in teaching operational calculus, equations of mathematical physics, mathematical modeling.