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  Title: Механика : Модул IV : Динамика / Гено Дунчев, Константин Арнаудов  Author: Дунчев, Гено Кръстев; Арнаудов, Константин Симеонов
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  Title: Comparative analysis of D and ID fractional regulators for the robust control of static plants  Author: Benova, Bela Oleg; Бенова, Бела Олег Date: 2004 Abstract: In this paper are given the basic properties and features of the CRONE control. One of the most popular methods for the synthesis of non-integer-order control systems — the approximation by a fractio-rational recursion — is used for the conception of fractional differentiator and integro-differentiator. The dynamic and robust characteristics of two control systems including, respectively, the D and ID regulators and the same static plant, are compared Conclusions are made on the advantages and inconveniences in using these fundamental types offractional-order controllers.
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  Title: Discrete robust control system with internal model  Author: Nikolova, Nina Georgieva Date: 2004 Abstract: The paper presents a proof for the applicability of a method for synthesis of robust internal model control systems. The case of discrete-time systems synthesis is discussed.
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  Title: Робастна каскадна система за управление с вътрешен модел  Author: Николова, Нина Георгиева; Николов, Емил Костов; Nikolova, Nina Georgieva; Nikolov, Emil Kostov Date: 2004 Abstract: In the present article is proposed the structure of a new robust cascade control system with internal model. The new system effectively combines the properties of the .robust system with internal model and robust system with conditional feedback, both well know in the literature. For synthesis of pro-posed system are used the method of a free parameter and method of the equation of stability. The applicability of the new system for control of industrial plant is confirmed by modeling and simulation. The robust stability and robust performance of the synthesized system are proved.
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  Title: Сравнителен анализ между някои методи за апроксимация на преходни характеристики  Author: Дойчев, Дойчин Йорданов; Doychev, Doychin Yordanov Date: 2004 Abstract: The approximation of the plant's step response is still the most traditional way for plant's dynamics modeling. In the paper some methods for step responses approximation are examined. The aim of this examination is to make some conclusions about using the plant models for controllers tuning. The comparative analysis is based on examples and simulations.
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  Title: Честотен анализ на линейни непрекъснати интегро – диференциращи системи  Author: Карлова, Весела Ангелова; Костов, Костадин Георгиев; Karlova, Vesela Angelova; Kostov, Kostadin Georgiev Date: 2004 Abstract: The paper studies linear continuous Lag-Lead systems in the frequency domain: The relations between some parameters of the frequency responses and the parameters of the system have been established in analytical form. Responses are presented in the different planes depending on the variation of the ratio between the poles and the zeros of the transfer function. The possible implementations of the systems are discussed.
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  Title: Оптимално по енергия управление на електрически бойлер  Author: Наплатаров, Константин Христов; Стоицева, Десислава Руменова; Naplatarov, Konstantin Hristov; Stoitseva, Desislava Rumenova Date: 2004 Abstract: The energy efficiency problem is a question of present interest especially in Bulgaria, which is at the back of the line on this criterion in Europe based on statistics. This article treats the possibilities of achieving electrical power economy in using electrical power boiler, through optimal control. The electrical power boiler, with sufficient accuracy in terms of practice and working area, could be approximated with first order non static. object. Results of several experiments on real object are given. These results show approximately 15-20% energy economy compared to conventional methods of using electrical power.
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  Title: Discrete fractional - order control system  Author: Nikolov, Emil Kostov; Николов, Емил Костов Date: 2004 Abstract: In the present article are proposed: structure of a fractional order control system; method for the synthesis of a fractional algorithm of a new class; method for a discretization of the fractional algorithm; it is deducated a finite difference equation suitable for a direct configuration of discrete controllers; it is submitted and solved a numerical example for the synthesis of a system with the proposed structure by using the method for the synthesis; the robust features of the synthetized system are proved.
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  Title: Система за управление на пастьоризатор  Author: Ружеков, Георги Томов; Събев, Диан Иванов Date: 2004 Abstract: In this paper was described a pasteurizator, its functions, modes and problems. The control system was based on the Siamtic S7 300 controller. The human machine intetface was realized by the touch panel TP170A. All dialogs are in Bulgarian. The system makes continuous diagnostics over all the valves, sensors and input — output controller modules. The flaws and the temperatures are being controlled by program designed PID controllers. In these controllers were implemented elements of the auto-tuning system. A system which collects and archives the data gathered from the process was designed based on the WinCC.
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  Title: Адаптивна компенсация на смущения по активен товар при работа на хидроагрегат в локална мрежа  Author: Пулева, Теофана Тодорова; Puleva, Teofana Tododrova Date: 2004 Abstract: In this paper an adaptive load disturbance rejection algorithm in hydro generator local network operation is described The active load variation is considered in the case of permanent disturbance, as well as ramp disturbance. The method is based on augmented estimator with the disturbance equation and its compensation in the control law. That permits to cancel out the effects of the disturbance in the steady state.
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  Title: Моделиране на процесите в абонатна станция за топлоснабдяване. Синтез на алгоритми за управление  Author: Райчева, Евелина Райчева; Хараланова, Елена Александрова; Raycheva, Evelina Raycheva; Haralanova, Elena Alexandrova Date: 2004 Abstract: The modernization of the district heating system in Bulgaria necessitates the study of processes of heat transfer in district heating substations in order to design contemporary control systems for these processes. In this paper reviewed are models, describing these processes and different algorithms for their automatic control. Presented are results of simulations as well.
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  Title: Интервални вероятности и вземане на решение при риск  Author: Гатев, Гео Иванов; Gatev, Geo Ivanov Date: 2004 Abstract: The concept of Interval Probabilities is introduced. An Interval Expected-Value Criterion for Decision-Making Under Risk is proposed for the cases when the probabilities of the states of the nature and the outcomes of decisions are uncertain, but the intervals within ,which the probabilities and outcomes are expected to fall are known. The results are applicable for the cases when the uncertainty is described using fuzzy numbers, by representing the corresponding fuzzy sets as unions of their a — cuts. Some tools for selecting the optimal alternative are presented
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  Title: Мярка за нелинейност в системите за управление  Author: Перев, Камен Лазаров; Perev, Kamen Lazarov Date: 2004 Abstract: This paper considers the notion of nonlinearity measure in control systems. The nonlinearity measure determines the distance between a given nonlinear system and its local linearization for particular set of input signals. One of the most important applications of the noniinearity measure is in determining the linearizing effect of feedback in control systems. Two examples are considered, where the nonlinearity measures for typical nonlinear elements are computed for different vector spaces and sets of input signals.
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  Title: Регионални модели за анализ на сеизмични огнища  Author: Ищев, Александър Каменов; Ищев, Камен Георгиев; Ishtev, Alexandar Kamenov; Ishtev, Kamen Georgiev Date: 2004 Abstract: Examined dynamic system consist of number of seismic stations, soil structures and a part of lithosphere under them. A considerable difference between the "nominal" model and the real del, received during small earthquake in a distance from these sites, indicates changes in the iracteristies of examined dynamic system. Analysis of the change character affords opportunities to ftriate future seismic activity and to localize the earthquake preparation zones.
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  Title: Мултимоделен апериодичен регулатор в САУ [Системитите за автоматизирано управление] с променлива тактова честота  Author: Гарипов, Емил Михайлов; Стоилков, Теодор Митков; Garipov, Emil Mihaylov; Stoilkov, Teodor Mitkov Date: 2004 Abstract: An original scheme of Multimodel Deadbeat Controller (MMDC) is submitted in the , paper. Thus the linear behaviour of the control system signals is protected even in case of constraints over the plant input. Program functions in MATLAB and block-diagrams in SIMULINK are built to realize a multirate frequency hybrid control system with MMDC.
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  Title: Проектиране и реализиране на универсален цифров ПИД [Потенциално интегрално диференциален] регулатор с обобощена дискретизация  Author: Гарипов, Емил Михайлов; Томов, Лъчезар Пл.; Garipov, Emil Mihaylov; Tomov, Lachezar Pl. Date: 2004 Abstract: All-purpose difference equations of digital PID controllers are worked out in the paper. The conditions of their stability functioning are taken into consideration depending on the changes at the analog controller coefficients and the used discrete-time interval. Critical analysis is made by test examples on the behaviour of simulation algorithms in SIMULINIC environment. Some approaches for digital integrating are underlined in order to avoid the shortcomings of the trade mark rules in the S-function, often lead even to the unstable control systems.
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  Title: Устойчивост на затворени линейни системи за управление с интервални данни  Author: Колев, Любомир Варадинов; Филипова-Петракиева, Симона Кирилова; Kolev, Lyubomir Varadinov; Filipova-Petrakieva, Sinoma Kirilova Date: 2004 Abstract: In this paper the problem of stability analysis of linear closed-looped systems under interval uncertainties is considered. The problem is reduced to the problem of determining outer bounds on the ranges of the eigenvalues of interval matrices with dependent coefficients with respect to the independent elements of all other interval matrices A' , B u K. The case of real eigenvalues is discuss for simplify' the presentation. The method is suggested first for stability analysis of open linear systems under interval data. It consist of setting up and solving a system of n nonlinear equations with n unknowns with real coefficients. The latter system is only mildly nonlinear and its solution presents no numerical difficulties. An example illustrating the applicability of the method presented is provided.
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  Title: Синтез на слабо нелинейни автоколебателни системи  Author: Савов, Весел Николаев; Георгиев, Живко Димитров; Тодоров, Тодор Георгиев; Savov, Vesel Nikolaev; Georgiev, Zgivko Dimitrov; Todorov, Todor Georgiev Date: 2004 Abstract: A method for the synthesis of weakly nonlinear oscillators systems by using qualitative theory of differential equations analysis is proposed in this article. The self- sustained oscillations in such systems are regarded as limit cycles. The synthesis of weakly nonlinear oscillators systems possessing limit cycles with preliminarily assigned properties is done by the Melnikov function.
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  Title: Сравнителен анализ на някои алгоритми за синтез на линейни стохастични адаптивни системи за управление  Author: Маджаров, Никола Енчев; Славов, Цоньо Николаев; Madzharov, Nikola Enchev; Slavov, Tsonyo Nikolaev Date: 2004 Abstract: A comparative analysis of some algorithms for design of linear stochastic systems with indirect adaptation is described in this paper. The comparing systems realized on basis of some estimation algorithms — recursive least-square algorithm, recursive least-square algorithm with multiple Kalman filter and recursive lest-square algorithm with adaptive Kalman filter.
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  Title: Нелинеен математичен модел на електромеханичните преходни процеси в еднофазен колекторен двигател с отчитане на загубите в стоманата : II Част – променлив ток  Author: Божилов, Ганчо Йорданов; Рац, Емил Р.; Михов, Михо П.; Иванов, Адриан П.; Ризов, Пламен Малинов (рец.); Bozhilov, Gancho Yordanov; Rats, Emil R.; Mihov, Miho P.; Ivanov, Adrian P. Date: 2004 Abstract: The article presents simulation and experimental examination of a single-phase commutator motor considering non-linearity of the magnetic chain and core losses with a mathematical model, created with MATLAB-SIMULTNK. In the material it is also presented an examination of some typical regimes as start, stop and power reverse: constant voltage, sine voltage,puts width modulated voltage and source with phase control of the voltage. It's made a comparison of the calculated and experimentally found results.

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