Том 8 № 3

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  • Документ
    TRAINING OF NUMERICAL CONTROL MACHINES OPERATORS: MODEL OF SYNTHESIS
    (2017) A. M. Silvestrov, A. I. Sorokovyi, A. I. Laktionov
    There are topical issues of development of the automated system intended for assessment of level of competence of industrial enterprises divisions for planning of training actions of specialists in automation of engineering processes are determined in article.
  • Документ
    FILTERS RESEARCH FOR FREE MOTION EXTRACTION IN SELF-TUNING AUTOMATIC CONTROL SYSTEMS
    (2017) V. A. Khobin, M. V. Levinskyi
    Technological type control objects specific feature, which distinguish them among many mobile or electro technical types, is more low-frequency parametric disturbances spectral composition than spectral composition of coordinate disturbances. Most often parametric disturbances reveal themselves in changing control object transmission coefficient in the channel ―controller control action – control variable‖. On a number of occasions transmission coefficient can change in a wide range – in 2…10 times more than initial value. Coordinate disturbances change control variables but don’t change control object features. Besides spectral density of control variable change, under the impact of coordinate disturbances, has its peak in low-frequency range and characterize forced component of automatic control system motion. Parametric disturbances have influence on control variables and on control object properties, in particular on its transition coefficient. In this case, character of transient processes change, i.e. free motion component of the system. Spectral density of control variable changes, under the influence of transition coefficient change, has its peak, in general, in mid-frequency range. In the case, when using filters, even approximately, it is possible to separate out mid-frequency component from the overall process, which characterizes generally free motion of automatic control system, then it is possible to estimate current value of control object transmission coefficient using parameters change of this component. Such control variable components motions separation is used for designing selftuning ACS. In this case the informative parameter is dispersions difference of control object control variable and control variable of its model in the outputs of linear band pass filters. This dispersion difference is in proportion to current value of transition coefficient. In this article the results of simulation modeling computer experiments of self-tuning automatic control system with opened self-tuning loop are represented. The analysis of filtering efficiency, for three filter model options, are represented as well. The analysis was carried out with three different coordinate disturbances spectral compositions, with the same dynamics of control object and its model and with the different dynamics. Recommendations for filters structures alternatives selection are given. The possibility of optimal parametric tuning of filters is examined.
  • Документ
    COMPUTER INTEGRATED MANUFACTURING: OVERVIEW OF MODERN STANDARDS
    (2017) A. Рupena, I. Elperin, R. Mirkevich, O. Klymenko
    The article deals with modern international standards ISA-95 and ISA-88 on the development of computer inegreted manufacturing. It is shown scope of standards in the context of a hierarchical model of the enterprise. Article is built in such a way to describe the essence of the standards in the light of the basic descriptive models: product definition, resources, schedules and actual performance of industrial activity. Description of the product definition is given by hierarchical presentation of products at various levels of management. Much attention is given to describe this type of resources like equipment, which is logical chain to all these standards. For example, the standard batch process control shows the relationship between the definition of product and equipment on which it is made. The article shows the hierarchy of planning ERP-MES / MOM-SCADA (in terms of standard ISA-95), which traces the decomposition of common production plans of enterprises for specific works at APCS. We consider the appointment of the actual performance of production at MES / MOM considering KPI. Generalized picture of operational activity on a level MES / MOM is shown via general circuit diagrams of the relationship of activities and information flows between the functions. The article is finished by a substantiation of necessity of distribution, approval and development of standards ISA-88 and ISA-95 in Ukraine. The article is an overview and can be useful to specialists in computer-integrated systems control and management of industrial enterprises, system integrators and suppliers.
  • Документ
    ЕКСПЕРТНА ОЦІНКА РЕВАЛЕНТНОСТІ ВІДПОВІДЕЙ АВТОМАТИЗОВАНОЇ СИСТЕМИ ПІДТРИМКИ ДІАЛОГУ ДЛЯ ДИСТАНЦІЙНОГО НАВЧАННЯ
    (2017) А. І. Лісовенко, О. В. Бісікало
    В статті представлено опис та аналіз існуючих методів експертної оцінки ревалентності відповідей автоматизованої діалогової системи, наведено переваги та недоліки кожного з них, а також обґрунтовано метод, що найбільше підходить для оцінки ревалентності відповідей нової діалогової системи для дистанційного навчання.
  • Документ
    ШВИДКИЙ АЛГОРИТМ АДАПТАЦІЇ ПІ- РЕГУЛЯТОРА
    (2017) Д. А. Шумигай, А. П. Ладанюк, Я. В. Смітюх
    Quality of the automatic control is the basis of economic effect of industrial control systems. The appropriate regulator settings should be found to improve the quality of automated control systems, but improved accuracy results in the reduction of stability margin, that’s why operators try to reduce setttings in complex systems (ie, set the "weak setting"),so the system could worke in all modes. Controller’s "low (all-mode) tuning" is the main disadvantage of existing control systems, which reduces profits. Frequent changes of plant parameters are the prime cause of low quality tuning and reduced efficiency of control systems. These changes are caused by changeable mode of plants, loop interdependence in multidimensional systems. In terms of operating the only one way is to ease settings, achieving reduction of loop interdependence, ensuring adequate stability margin in all possible modes of operation. The quality of work with such tuning is obviously worse and the profit is less. The article presents possible approaches that can increase the efficiency of automatic control systems and describes the adaptation algorithm for PI controller based on an analysis of statistical data.