Vol 25, No 4 (2017)
- Year: 2017
- Articles: 22
- URL: https://journals.eco-vector.com/1991-8542/issue/view/1198
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For an elastic distributed plant with parameters depending on the spatial variable, based on the spectral method of distributed systems analysis and synthesis and considering the internal resistance according to Voigt the transition is made from PDE to an infinite system of ODE in state space form. The boundary conditions are additively included to the obtained spectral representation, which enables to control from the boundaries. The control law for suppression of oscillations is synthesized and the closed system is analyzed. The obtained results can be used in the control systems synthesis for aircraft with active dynamic compensation of elastic vibrations.
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A restorable system with linear branching structure and finite reliability is considered. Preventive maintenance of its elements is carried out. Operation and restoration periods are assumed to be random values of general kind. Iteration processes of calculation of stationary reliability and economical characteristics of the network are constructed. Optimal intervals between elements’ maintenance are obtained as the functions of their times-to-failure. The examples of electricity supply network and industrial circuit-switched net are given. It is shown that the optimal choice of elements’ preventive maintenance results in economical network indexes improvement.
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We examine issues of sinter quality management by means of changing the level of carbon in charge mixture. We show the main problems: low frequency of control of quality indicators and influence of carbon level in mixture on productivity which has to remain high. To solve the problem of sinter quality management we propose using a double-loop system of automated optimization on the basis of an optimum control system and a loop for cold mechanical strength stabilization. We consider issues of loops coordination and explore influence of their setting parameters on management efficiency. We assessed the effeciency by attainable productivity and cold strength levels. We show the need for a compromise between the mentioned indicators for the efficiency assessment when current disturbing frequency increases. We determined a correspondence between the frequency of control of cold mechanical strength index and the share of conforming sinter.
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