Ivanova G. Automatic control system of metal cooling modes of continuous casting machine

The research object: system of automatic control of processes of cooling of a continuous ingot. The purpose is development of algorithms and methods of research of the continuous ingot thermal state, identification thermal and physical parameters and control of cooling modes in processes continuous casting of steel based on mathematical modeling. Methods of researches are based on the theory of continuous casting of steel, the equations of mathematical physics, numerical methods of problems with unknown boundary for the equations in partial derivatives, the theory of inverse problems, methods of identification of the distributed parameters, the automatic control theory, methods of computer modeling. On the basis of thermal-physical lows the mathematical models of quasistationary and non-stationary processes of heat transfer and heat-mass transfer with the phase transition are developed. It allows observing the thermal processes occurring in the continuous ingot and in mold walls in real time, to investigate the sensitivity of various operated parameters of process to changes of operating parameters, to make an operative estimation of the ingot thermal condition. Ways of identification of the distributed parameters of external heat exchange for initial and adaptive adjustment of convection heat transfer coefficient on the ingot surface are developed. On the basis of the mathematical model, that gives the operative estimation of the temperature condition of the continuous ingot, new model based predictive algorithms are offered and programmed. These algorithms support the stabilization of the required temperature mode of cooling ingot and allow raising quality of output metal. Results of the thesis research, and also the developed software, have been used for mathematical modeling, parametrical identification and synthesis of control algorithms by non-stationary heat-mass transfer processes in continuous ingot at the "Kiev institute of automation" and at Nizhnetagilsky metallurgical industrial complex. Usage area - metallurgy.