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Article title FUNCTIONAL DIAGNOSTICS OF THE ADAPTIVE CONTROL SYSTEM: STATEMENT OF THE PROBLEM AND ITS SOLUTION
Authors A.V. Kondrashin, V.S. Karasev
Section SECTION III. SAFETY OF COMPLEX SYSTEMS
Month, Year 08, 2016 @en
Index UDC 681.5.09
DOI 10.18522/2311-3103-2016-8-7988
Abstract Presented are the conceptual provisions which define the specific tasks of functional diag-nostics of one class of searchless adaptive control systems characterized by the use of indirect indicators which are calculated from the real-time error control. The urgency of the problem is caused by the elevated requirements of complex technological object of control. Introduced is the concept of functional performance area which takes into account the risks of deterioration of adaptive control. The solution of the problem made it possible to supplement the functions of an adaptive system with the self-diagnostic function having the ability of mild attenuation of the adapting effects when approaching the threshold values of diagnostic indicators. The solution is based on the use of the linguistic variable assessing the diversity of functional states of the system. Described are the technical solutions used in the existing adaptive system of control of the super-heated steam temperature in large power boiler. Each typical functional state corresponds to the action of control, which reduces or eliminates the effect of risk on the quality control. To increase the quality of control in the context of unpredictable changes in operation factors which significantly affect the dynamic characteristics of the control object, it is proposed to use a compromise solution, which combines the adaptive tuning of the controller parameters and the tuning based on pre-prepared table of solutions, taking into account the value of the leading operation factor, the steam boiler load. All technical solutions are focused on application of modern microprocessor control systems providing the capability of solving many functional tasks in real-time. The achieved functional flexibility of the control system allows expecting its effective application in conditions of different level of adjusters’ professional skills.

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Keywords Searchless adaptive system; functional diagnostics; linguistic variable; functional perfor-mance area; microprocessor control system.
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