автоматика
В. Руйкова. Обобщено предсказващо управление с компенсация на смущения за процеси със закъснение

Статията е 1 от 11 в списание АВТОМАТИКА И ИНФОРМАТИКА 2, 2022 г.

Key Words: Generalized predictive controller; disturbance compensation; time-delay; Diophantine equation.

Abstract. The aim of this paper is to design predictive algorithm for control of time-delayed systems with the possibility of measurable disturbance compensation. A new approach to extended Generalized Predictive Control (GPC) has been proposed. Three Diophantine equations are solved non recursively. The cost function and the control law of the GPC are derived. Simulation examples are presented to show results of the design. Two cases are considered – in case of delay between the input and the output of the process, less than the delay, between the disturbance and the output of the process, and in case of delay between the input and the output of the process, greater than the delay between the disturbance and the output of the process. In both cases, comparisons were made between a standard GPC, a compensator with future interference values included in the GPC, a compensator without future interference values included in the GPC and a classic compensator for one case. The results show that the GPC cannot completely eliminate the disturbances, even when the future disturbances values are included in the control. Complete elimination of the disturbances is possible only when the weighting factor, that distributes the energy of the controller, is zero.

Повече

автоматика
М. Петров. Многокритериална оптимизация за производството на етанол от щам Saccharomyces cerevisiae

Статията е 2 от 11 в списание АВТОМАТИКА И ИНФОРМАТИКА 2, 2022 г.

Key Words: Multiple objective optimisation; ethanol production; Saccharomyces sereviciae; general multiple objective optimisation; fuzzy optimisation; fuzzy multiple-objective optimisation.

Abstract. A fuzzy procedure is applied in order to find the optimal feed policy of a fed-batch fermentation process for ethanol production using a Saccharomyces serevicieae. The policy consists in feed flow rate, feed concentration, and fermentation time. In this study biotechnological process is formulated as a general multiple objective optimisation problem. By using an assigned membership function for each of the objectives, the general multiple objective optimisation problem can be converted into a maximizing decision problem. In order to obtain a global solution, a method of fuzzy sets theory is introduced to solve the maximizing decision problem. After this multiple optimisation, the useful product quality is raised and the residual substrate concentration is decreased at the end of the process. Thus, the process productiveness is increased.

Повече

автоматика
С. Митева, Д. Попов. Присъединяване на криогенна батерия към конвенционална енергопреобразуваща инсталация

Статията е 3 от 11 в списание АВТОМАТИКА И ИНФОРМАТИКА 2, 2022 г.

Key Words: Liquid air; energy storage; regenerative steam cycle; feed water; waste heat.

Abstract. The aim of the present study is to evaluate an option of integration of liquid air energy storage (LAES) into regenerative steam turbine cycle. The waste heat from LAES discharge is used for feed water preheating. Thermodynamic analysis shows that the newly proposed hybrid LAES system has a round-trip efficiency of 16% higher than the standalone LAES.

Повече

информатика
Ж. Жейнов, Й. Урумов. Моделиране на влиянието на деформация върху загубите в оптично влакно на Брег

Статията е 4 от 11 в списание АВТОМАТИКА И ИНФОРМАТИКА 2, 2022 г.

Key Words: Bragg fiber; bending; losses; Photonic Crystal Fiber; model of deformation.

Abstract. The article analyzes the losses in one type of Photonic Crystal Fiber – Bragg fiber. It is one-dimensional fiber, made as coaxial cylindrical layers. The fiber cladding is a dielectric mirror realized as a multilayer dielectric coating. The paper proposes a method based on geometric optics for the analysis of light propagation losses in a multilayer microstructured fiber with an air core, as a result of tunneling. A model of M-layer fiber with set refractive indices of the dielectric layers is proposed. The angles of incidence and reflection of the boundaries of each two layers of the fiber cladding according to Snelius’ law are calculated. The transverse reflection coefficients of each boundary between two layers for TM and TE polarization are calculated. The electric fields of the reflected and incident beams are calculated. The magnitudes of these vectors are recursively related to each boundary of the previous and next fiber layer. The input power of the light in the first fiber layer for TE and TM polarization is calculated. The losses from light reflection when it passing through all layers of the fiber as a function of the reflection coefficients are calculated. The normalized attenuation is calculated. The characteristic equation for the optical waveguide is decided. The angles of reflection in different modes are calculated. The distance between two consecutive reflections of the beam is calculated as a function of the reflection coefficients for the different polarizations and the reflection angles of the layers for TE and TM polarizations. They determine the reflection coefficient and the phase change when light passes through the whole fiber. The delays of the rays with TE and TM polarization are obtained. The expressions for the chromatic dispersion of the fiber for TE and TM polarization are then derived. A mathematical model of the deformation, presented as a change in the geometry of the fiber in this section as part of a circle is proposed. For this section of the deformed fiber by geometric transformations the connection between the angles of incidence and reflection in the straight and in the round section of the deformed fiber is calculated. The distance between two consecutive reflections from the fiber boundary surface of the rays trajectory is determined by the number of consecutive reflections in the core of the fiber. The reflection losses in TE and TM polarization, which are proportional to the number of beam reflections, are then determined. The phase delays for beams with TE and TM polarization for a fiber of a certain length are determined as the sum of the individual delays in the reflections of the beams. The proposed mathematical model and algorithm for calculating the attenuation of the fiber for different modes of TE and TM polarization, an example of M-layer PCF fiber with air core and alternating dielectric layers with two alternating coefficients and thicknesses is solved, so as to create at the average wavelength of light a phase shift of 900. A MATLAB program has been written. It simulates the attenuation and dispersion of a fiber with set optical parameters. After solving the characteristic equation for this fiber with the introduced parameters, the normalized attenuations for TE and TM polarization are calculated for fiber with and without deformation for different propagating modes. Calculations have been made for fibers with core radius of 20-200 μm for a light wavelength of 1559 nm. The attenuation and chromatic dispersion graphs for TE and TM polarization of several straight and deformed fibers with the same length and different number of layers were plotted. A conclusion about the influence of the core diameter, the bending radius and the number layers of the fiber cladding on the losses of the different propagated modes is made. A comparison of PCF losses and ordinary quartz single-mode fibers was made. In conclusion, the disadvantage of the proposed method is that only the meridional rays of the propagating light are analyzed and the dielectric losses in the fiber cladding are not taken into account. The advantage of the proposed method is the small computational complexity and the correct qualitative result of the PCF analysis with certain parameters. Guidelines for future development are proposed – analysis of the losses of the fiber, taking into account the non-meridional rays in the fiber. The possibilities for using PCF for information transmission and as dispersion compensators in telecommunications are pointed. The possibility of using the method for optimization of certain parameters of PCF of this kind is proposed.

Повече

интелигентни системи
Г. Гергов, Дж. Круз, Е. Кирилова. Сравнителна оценка на способността за предсказване на PLS и RBF ANN калибрационни техники, приложени за SW-NIR данни за месо

Статията е 5 от 11 в списание АВТОМАТИКА И ИНФОРМАТИКА 2, 2022 г.

Key Words: NIR spectroscopy; Partial Least Square method; Radial Basis Functions Neural Networks; moisture content; fat content; pork meat samples.

Abstract. In this study the performance of linear and nonlinear chemometric methods has been investigated and compared. The transmittance spectra of pork meat samples were collected by SW-NIR (short wave near infrared) analyser in the spectral range of 850 nm to 1,050 nm. Partial Least Square (PLS1) method and Radial Basis Functions Neural Networks (RBF NN) were chosen for chemometric analysis of that samples for determination of moisture and fat content. The reason for using RBF ANN is significant nonlinearity which is exhibited between the spectra and the fat and moisture content. PLS1 and RBF NN with different architecture have been combined with different pre-processing techniques such as first derivative (D1), standard normal variate (SNV), multiplicative signal correction (MSC) and the combinations of MSC and SNV with first derivative. It was found that optimal pre-processing was MSC for moisture, and the combination of D1and SNV for fat. When PLS1 was used, results showed reduction of RMSEP and REP using MSC with 15 and 13% for moisture determination. In case of PLS1 fat determination considerable reduction of RMSEP and REP was observed using a combination of D1 and SNV with 48 and 47%. Compared to PLS1 regression with suitable preprocessing, RBF ANN showed better results: reduction of RMSEP and REP using a combination of D1 and SNV with 48% for moisture, and reduction using a combination of D1 and SNV with 59% for fat determination. These improvements together with the facility of SW-NIR technology to be implemented in the process engineering made it ideal for the meat industry.

Повече

интелигентни системи
Г. Колев, Е. Колева. Интегрирана система тип умен дом

Статията е 6 от 11 в списание АВТОМАТИКА И ИНФОРМАТИКА 2, 2022 г.

Key Words: Internet of Things; Wireless Sensor Network; smart home; integration; voice assistant.

Abstract. An integrated Smart Home system for monitoring and management of the elements of the working environment or at home in Home Assistant platform and is integrated with a voice assistant (Google Assistant) has been developed. The structure of the Smart Home (SH) system is based on the concept of the Internet of Things (IoT), which includes connectivity of devices and actuators, as well as the presence of Wireless Sensor Network (WSN). The main functions in each SH depend strongly on the requirements, way of live, special health issues, availability of pets and appliances etc. of the household members, as well as the home/house architecture, location etc. The developed integrated system structure consists of the following main modules: connected devices, measuring (sensor) module, processing module, visualization module (interface), communication module (voice communication). The system allows monitoring and control of various parameters of the environment, determination of geolocation, tracking the state of the connected devices, provides ascertainment of conditions or constraints during the implementation of logical algorithms or actions, etc. The developed integrated system solves the problem of using various interface applications, communication protocols and standards by integration of all its elements in one Application Programming Interface (API) and simultaneously the system is expanding its scope through its integration with a voice assistant (Google Assistant). In the developed integrated system solutions with pre-set functions, default functions and user selection functions are implemented. Also, specially designed by the author (G. Kolev), made and tested IoT boards for stepper motor control, RGB LED strip, as well as IoT board for control of small relays for concealed mounting are applied. The system operation rules can be set by the user (directly or in time) or depending on the values obtained from the sensors (Sensor-based Linked Open Rules). The developed SH system gives also the possibility for building actions according to the geolocation of each of the devices (users) via the GPS system of the phone. Elements, connected with the energy utilization (consumption) efficiency – electricity, water and heat consumption efficiency are also considered. The optimization of the consumption is directly connected with cost savings which adds an additional benefit to the undeniable advantages of the Smart Home system development. The process of development of integrated remote-control Smart Home systems can continue without limitation in time as far as the imagination of the designer and/or the users reaches.

Повече

новости, информация, общество
Общо събрание на Съюза по автоматика и информатика „Джон Атанасов“

Статията е 7 от 11 в списание АВТОМАТИКА И ИНФОРМАТИКА 2, 2022 г.

На 31 май 2022 г. Съюзът по автоматика и информатика „Джон Атанасов“ (САИ) проведе Общо събрание, на което Управителният съвет направи отчет за периода 2017-2021 г., бяха набелязани насоки за следващия отчетен период 2022-2025 г. и бяха проведени избори за нови ръководни органи на САИ.

В отчетния доклад беше акцентирано върху големия брой проведени престижни международни конференции и симпозиуми като: Advances in Neural Networks and Applications (ANNA), 15-17 септември 2018 г., Варна; 19-а IFAC конференция „Technology, Culture and International Stability” (TECIS’19)…

Повече

новости, информация, общество
Ново ръководство на САИ „Джон Атанасов“, избрано на Общото събрание на 31 май 2022 г.

Статията е 8 от 11 в списание АВТОМАТИКА И ИНФОРМАТИКА 2, 2022 г.

Управителен съвет
1. Ангел Смрикаров
2. Валери Андреев
3. Ваня Стойкова
4. Валери Младенов
5. Васил Сгурев
6. Веселин Акиванов
7. Владимир Йоцов
8. Драгомир Добруджалиев
9. Емил Николов
10. Иван Куртев
11. Камен Спасов
12. Камен Перев
13. Кирил Алексиев
14. Кирил Боянов
15. Коста Бошнаков
16. Красимира Стоилова
17. Любка Дуковска
18. Минчо Хаджийски
19. Михаил Петров
20. Никола Николов
21. Никола Петков
22. Петко Русков
23. Пламен Ангелов
24. Румен Трифонов
25. Станимир Йорданов
26. Таня Пенчева
27. Христо Вълчанов
28. Цветелина Георгиева
29. Чавдар Дамянов
30. Ясен Горбунов

Повече

новости, информация, общество
Насоки за дейността на САИ за периода 2022-2025 г.

Статията е 9 от 11 в списание АВТОМАТИКА И ИНФОРМАТИКА 2, 2022 г.
  1. Увеличаване на членския състав (физически и юридически лица) и преди всичко привличане на млади специалисти, на колеги от бизнеса и на работещи в чужбина. Укрепване и разширяване на организационните структури и развитие на дейността им.
  2. Продължаване на усвояването и широко прилагане на информационните технологии в съюзния живот в посока на обобщение на най-актуалните научно-технически предизвикателства в областта на дигитализацията и иновациите в духа на Индустрия 4.0.

Повече

in memoriam
Проф. д.т.н. инж. Никола Маджаров

Статията е 10 от 11 в списание АВТОМАТИКА И ИНФОРМАТИКА 2, 2022 г.

Покрусени съобщаваме, че на 6 юни 2022 г. ни напусна уважаваният и обичан от няколко поколения негови колеги преподаватели, от многобройните негови студенти и докторанти и от цялата гилдия на специалистите по автоматика и информатика проф. д.т.н. инж. Никола Маджаров.

Проф. Никола Маджаров беше талантлив учен със сериозен авторитет в научната общност по автоматика в България с дългогодишна преподавателска, научноизследователска и организационно-административна дейност. Той беше научен ръководител на много преподаватели и докторанти в областта на автоматиката.

Повече

in memoriam
Проф. д.т.н. инж. Никола Енчев Маджаров

Статията е 11 от 11 в списание АВТОМАТИКА И ИНФОРМАТИКА 2, 2022 г.

Никола Маджаров е роден на 5 септември 1934 г. в Сопот.

Завършил е висшето си образование през 1958 г. в Машинно-електротехническия институт (МЕИ) – София, като електроинженер със специалност електрообзавеждане на промишлени предприятия.

Започнал е своята трудова дейност през 1958 г. като началник на електролаборатория в Държавния металургичен завод в Перник, където работи до 1960 г. През 1960-1961 г. е редовен асистент в МЕИ – София, по „Електрообзавеждане и автоматизация на промишлеността”.

Повече

автоматика
М. Хаджийски. Взаимното проникване и обогатяване като двустранен ускоряващ фактор за развитие на машинното обучение и автоматиката

Статията е 1 от 10 в списание АВТОМАТИКА И ИНФОРМАТИКА 1, 2022 г.

Key Words: Artificial intelligence; control theory; deep learning; industrial automation; machine learning; reinforcement learning.

Abstract. The study shows that the existence of fundamental similarities between control theory and machine learning is a real basis for productive interpenetration and enrichment with new concepts, methods and tools, which are mutually beneficial for overcoming a number of serious modern challenges such as the control of complex and autonomous systems, cybersecurity, intelligent robotics, bioautomatics. The continuous development of the control theory as a result of its own progress and under the influence of the ideas of artificial intelligence will not allow the transformation of automation into a routine engineering discipline. In turn, the systems based on artificial intelligence and machine learning are enriched with well-developed methods and procedures from the control theory in order to improve and create new algorithms and to ensure a higher speed, robust stability and optimality of the learning process. Industrial automation systems will absorb the innovative results of the interpenetrating development of artificial intelligence and control theory improving both the quality and scope, safety and security of operations.

Повече

автоматика
М. Петров. Оптимизация на биотехнологични процеси чрез комбиниран алгоритъм

Статията е 2 от 10 в списание АВТОМАТИКА И ИНФОРМАТИКА 1, 2022 г.

Key Words: Fuzzy sets theory; random search with back step; combined algorithm; initial condition.

Abstract. A combined algorithm for optimisation of biotechnological processes has been developed. The algorithm includes a random search method for an optimal choice of an initial point and a method based of the fuzzy sets theory. Combining both methods overcomes а major disadvantage of the fuzzy optimisation method, connected with a determination of large scale problems. The combined algorithm has been successfully applied for optimisation of the initial condition and optimal control of the biotransformation process of whey fermentation by а strain Kluyveromyces lactis MC5.

Повече

информатика
Р. Иванов. Автоматично разполагане на радиомаяци при локализация на закрито

Статията е 3 от 10 в списание АВТОМАТИКА И ИНФОРМАТИКА 1, 2022 г.

Key Words: Beacon deployment; indoor localization; Indoor Positioning Systems.

Abstract. Localization of visitors in public buildings is a key technology to create accessible environments using location-based services. The usability of these services and the satisfaction of their clients depend on the accurate calculation of the position of visitors. This is most often realized using wireless sensor networks. The localization accuracy depends on a number of factors, one of which is the deployment of the sensor nodes. This is a complex task, which is most often realized by experts. In this article, we offer a complete solution for creating systems for indoor localization, which includes: (1) Algorithm for fast partitioning of the building components into non-overlapping rectangles; (2) Algorithm for sensor nodes deployment based on the geometry of the rectangles obtained; and (3) Algorithm for optimizing the sensor nodes placement taking into account the connectivity between the building components (rooms and corridors), as well as the static objects, which are obstacles for radio signals. Numerous experiments have been implemented in stimulating and real environments, which prove the applicability of the proposed solution.

Повече

информатика
П. Василев, В. Синдраковска. Взаимовръзки между стандартите IEC/EN 62264 и RAMI 4.0

Статията е 4 от 10 в списание АВТОМАТИКА И ИНФОРМАТИКА 1, 2022 г.

Key Words: RAMI 4.0; IEC/EN 62264; asset; communication and presentation capabilities; activity; scheduling; model; web services; B2MML.

Abstract. The Reference Architectural Model for Industry (RAMI) 4.0 tends to unify the efforts for rapid development of new technologies of the information and communication technology sector by stating definitions of an asset and its role in the cyber-physical world with the use of presentation and communication functions applied to the asset. Furthermore, the standard describes how an asset should interact with the cyber-physical world. In order to introduce the asset as a conceptual fundament, the standard RAMI 4.0 extends the Equipment hierarchy model of another standard – IEC/EN 62264, which is well known and applied as an architectural framework within software integration projects of various information systems. The differences between, are that in IEC/EN 62264, a physical asset model corresponds to the equipment model, whereas the RAMI 4.0 states that an asset may present even a Product or Connected World (Cyber-Physical World). The introduced extension is necessary because th perspective of the two standards is different. IEC/EN 62264 defines objects and models for integration, in which a Product, as an abstraction of “what should be made?” is a part of Product Definition Model (Operations Definition Model), and when it is physically performed “what is actually made?”, it is a part of Material Model. As such, the objects “carrying” the integration information are different. The Connected world also is an asset in RAMI 4.0, because it has value for a company, while the whole subject of the IEC/EN 62264 standard is to integrate information systems, thus achieving “Connected World”. This is why the standard IEC/EN 62264 should be considered as a “roadmap” for the cyber-physical transformation of the RAMI 4.0 standard. The aim of the article is to discuss the importance and the assumption of non-implicit relations between the two standards as well as the concept for development of RAMI 4.0 administration shell based on IEC/EN 62264 architecture.

Повече

информатика
Р. Калтенборн. Integration in Educational Systems Extended with Artificial Intelligence – Based Technologies

Статията е 5 от 10 в списание АВТОМАТИКА И ИНФОРМАТИКА 1, 2022 г.

Key Words: Artificial intelligence; intelligent learning system; integration; learning technologies; optimization; system of systems.

Abstract. The main problems related to the integration of diverse functional elements of advanced intelligent learning systems are considered. It is shown that the integration of the elements in the learning process is a complex multilayered process due to the great variety and complexity of the ongoing basic processes – cognitive, pedagogical, technological, social and interpersonal. It is emphasized that the need for the integration process to be solved as a multifactor optimization data-driven problem and the use of modern techniques in the field of artificial intelligence – machine learning, pattern recognition, natural language processes, network management.

Повече

новости, информация, общество
Клуб САИ през 2021 г.

Статията е 6 от 10 в списание АВТОМАТИКА И ИНФОРМАТИКА 1, 2022 г.

Клуб САИ продължава да е едно от най-привлекателните и популярни мероприятия на Съюза. Наред с чисто човешките, колегиални и професионални контакти представянето на фирмите позволява членовете на САИ да се запознаят с постиженията в предметната област на Съюза, постижения на колеги в сходни области и проблемите на реалната икономика.
През 2021 г. се проведоха осем сбирки. Само две от сбирките – през май и юни 2021 г., се проведоха по обичайния начин на живо съответно в зала 4 и 3 на ФНТС.

Повече

новости, информация, общество
Дни на Джон Атанасов и IEEE International Conference Automatics and Informatics 2021 (ICAI’21), 30 септември – 2 октомври 2021 г., Варна

Статията е 7 от 10 в списание АВТОМАТИКА И ИНФОРМАТИКА 1, 2022 г.

Ежегодната международна конференция IEEE International Conference Automatics and Informatics’21 (ICAI’21), продължение на традиционната Международна конференция „Автоматика и информатика“, се проведе в периода 30 септември – 2 октомври 2021 г. с домакин ТУ – Варна. Тя е едно от основните мероприятия в дните на Джон Атанасов, които се провеждат под патронажа на президента на Република България с цел представяне и популяризиране на резултатите от научните изследвания в областта на автоматиката и информатиката, както и отбелязване на 4 октомври – професионален празник на българските специалисти по компютърна техника, информационни технологии и автоматика.

Повече

новости, информация, общество
Седма международна IEEE конференция „Big Data, Knowledge and Control Systems Engineering – BdKCSE’2021“

Статията е 8 от 10 в списание АВТОМАТИКА И ИНФОРМАТИКА 1, 2022 г.

Седмата международна IEEE конференция „Big Data, Knowledge and Control Systems Engineering – BdKCSE’2021“, организирана от ИИКТ – БАН, и САИ „Джон Атанасов“, се проведе виртуално на 28-29 октомври 2019 г. Конференцията се осъществи с техническата поддръжка на Американският институт за електро- и електронно инженерство (IEEE), като беше регистрирана под номер 48644 и включена в списъка на провежданите IEEE конференции.

Повече

новости, информация, общество
29-и международен симпозиум „Управление на енергийни, екологични и индустриални системи“, 11-12 ноември 2021 г., София

Статията е 9 от 10 в списание АВТОМАТИКА И ИНФОРМАТИКА 1, 2022 г.

На 11-12 ноември 2021 г. във виртуална среда се проведе традиционният ежегоден 29-и международен симпозиум „Управление на енергийни, индустриални и екологични системи“, организиран от Съюза по автоматика и информатика „Джон Атанасов“ със съдействието на ФНТС.

В повече от четвъртвековното си съществуване симпозиумът е поддържал неизменно линията за връзка между специалистите по автоматика и информатика от изследователските групи и индустрията.

Повече