Кафедри
Постійне посилання на розділhttps://repository.kpi.kharkov.ua/handle/KhPI-Press/35393
Переглянути
3 результатів
Результати пошуку
Документ Synthesis of minimal schemes of systems control of hydraulic and pneumatic drives(Національний технічний університет "Харківський політехнічний інститут", 2023) Cherkashenko, M. V.The existing schemes of command apparatus are presented. Their analysis is carried out and the shortcomings are indicated. The scheme of a fundamentally new command apparatus is given, which can significantly reduce the number of its elements. The synthesis of the pneumatic control system of the foundry machine was carried out on the basis of the design approach proposed by M. Cherkashenko, which as a result led to a reduction in the devices by 3.5 times. A graph of operations of the pneumatic control system of the molding machine is constructed. A matrix of correspondences is obtained, which determines the correspondence between the signals that cause transitions and the complete input sets acting in the transitions. Analysis of the matrix of correspondences made it possible to identify and eliminate contradictory transitions. On the basis of the elongations, a system of equations describing the scheme of the control system is synthesized. Further, minimization is performed due to factorization and decomposition of equations, and obtaining equations in their final form. A diagram is presented pneumatic control system of the molding machine, consisting of a command apparatus containing three cells, five cylinders, two vibrators, six limit switches, a time relay and other devices. The circuit simultaneously uses the functional and logical capabilities of limit switches, the possibility of implementing the functions of three variables by distributors. Thus, the use of the proposed command apparatus, in contrast to the existing schemes of command apparatus, can significantly reduce the number of distributors in the synthesis of the command apparatus itself and significantly reduce the number of elements when using the chosen approach to the design of circuits of pneumohydraulic control systems.Документ On the theory of synthesis of minimal schemes of systems control of hydraulic and pneumatic drives(Національний технічний університет "Харківський політехнічний інститут", 2022) Cherkashenko, M. V.Showed the strict compliance of the scientific direction "Synthesis of minimum control schemes of hydraulic and pneumatic drive systems" developed by the author with the point of view of general algebra, algebra of logic, graph theory and automata theory. The synthesis of the minimum graph of operations, which is a mathematical model of the control system, has been proved. The legitimacy of the methods of undivided decomposition of equations describing the scheme of the control system has been proved. The control system is considered as a cyclic Moore finite automaton. By a cyclic automaton (CA) we will understand the mathematical model of a device designed to control cyclic processes, which are a set of technological operations performed in a certain sequence. In this regard, the automaton at each clock necessarily passes into some new state, and for a finite number of cycles the target reaches any state, and its graph contains a contour, covering all states. In general, the CA may contain several circuits, so that each circuit is interpreted either as one of the possible sequences of technological operations due to the corresponding mode of operation, or as an independent and simultaneous execution of a number of sets of technological operations. A sequential decomposition of the CA is presented in order to represent it by the sequential operation of automata with one internal state. Such a consideration of the function of transitions will naturally lead to a decrease in the number of elements in the implementation of the CA. The study will be subjected to the CA, the graph of which consists of a single circuit, since the results obtained are easily generalized to multi-circuit CA. Obtaining a breakdown of the states of a cyclic automaton in the manner indicated above is performed directly according to any automaton description without any additional calculations, tables and other constructions.Документ Synthesis of minimum control systems of hydraulic and pneumatic drives(National Technical University "Kharkiv Polytechnic Institute", 2022) Cherkashenko, M. V.The monograph presents the scientific direction developed by the author: "Synthesis of minimum of control systems of hydraulic and pneumatic drives", associated with topical problems of the modern theory of synthesis of drive s control systems, including theoretical foundations and methods of structural analysis and synthesis of d rive s control systems. Modern text material is of interest to professionals engaged in t he development of drive systems. Is intended for students in the study of relevant courses, as well as for raduate students of engineering speci alties.