Sokol D. Models and methods for rational control of a vortex energy separator

The dissertation is dedicated to a vital problem of development of a rational control system for the vortex energy separator under conditions of uncertainty by solving problems of diagnosing and restoring performance. The object of research is a process of diagnosing and restoring the vortex energy separator performance. The subject of research is models, methods and facilities of vortex energy separator rational control under conditions of uncertainty caused by destabilizing effects of various origins. The work presents an analysis of existing control systems for the vortex energy separator, design and functional features of the vortex energy separator are determined, and an analysis of the used control principles for vortex energy separator efficiency and typical approaches to a mathematical description of the vortex energy separator is carried out. An analysis of relevant research on development of the vortex energy separator automatic control systems has been carried out. The main shortcoming of these researches is the lack of a complete and adequate description of the processes taking place inside the vortex energy separator. Experimental studies of the operation of the automatic temperature stabilization system, formed using the deviation control principle, indicate the existence of factors that significantly affect the system operation. The application of such an approach to the control of the vortex energy separator as a non-linear object is not effective enough, since the problem of regulating the vortex energy separator parameters arises. The results of a Computational Fluid Dynamics (CFD) simulation of the vortex energy separation process are presented. The structure and parameters of the vortex energy separator mathematical model as an automatic control object are determined using interval linearization and analysis of known experimental frequency characteristics. The structure of the vortex energy separator rational control system has been developed, which includes the vortex energy separator as a rational control object, a diagnostic module and a control module. The diagnostic software module has been developed in the form of linear diagnostic models of the rational control system of vortex energy separator as the rational control object for the consistent removal of uncertainty and diagnosing destabilizing effects. The control module has been developed in the form of algorithms for restoring the performance of the rational control object. The model of the vortex energy separator rational control system has been developed in the Simulink environment, which includes diagnostic and control modules, mathematical models of the vortex energy separator as the automatic control object. A series of computational experiments was carried out to diagnose various types of destabilizing effects and restore the performance of the functional elements of the rational control object using computer modeling. The presented graphs show that the developed rational control system of the vortex energy separator quickly and unambiguously diagnoses inoperable functional elements of the rational control object and effectively counters detected types of destabilizing effects. The effectiveness of the rational control system is evaluated using numerical quality indicators for various destabilizing effects. The scientific novelty of the obtained results: - for the first time, linear diagnostic models of the vortex energy separator as a rational control object have been developed, which differ from the known ones by using the structural and parametric features of abnormal functioning of the vortex energy separator, which makes it possible to analytically formulate rational control algorithms; - the method of structural-parametric identification based on the experimental frequency characteristics of controlled objects has been improved, differing from the known one by using polynomial derivatives, which makes it possible to increase the adequacy of the linear mathematical description; - the method of forming algorithms for diagnosing the vortex energy separator as a rational control object has been further developed, which differs from the known use of fragmentary linear diagnostic models, which makes it possible to simplify the structure of algorithmic support for the rational control process and improve performance; - the method of forming algorithms for restoring the performance of functional elements of the rational control object has been further developed, which differs from the known one by specifying the use of functional diagnostic models and means of parrying destabilizing effects, which makes it possible to develop effective algorithms for performance restoration.