BUČEK Pavol ŽP VVC s.r.o.

Spoluautoři NOGA Pavol, TKÁČ Lukáš, HULKÓ Gabriel

In continuous casting, the secondary cooling zone plays a crucial role in solidification process in a casting strand. Improper cooling conditions may have a detrimental impact on stress distribution in solidified shell, leading to cracks and other casting defects. Careful design of operating regimes for secondary cooling zone requires the effect of spray zones on overall temperature field of the strand to be known, be it in steady or transient state. Transients, as the inherently dynamic phenomena, represent a considerable challenge for control due to natural nonlinearity of solidification, the peculiar character of process time constants and, most importantly, stringent economics of the whole production process. In this paper, a feasibility study of online identification and adaptive control of secondary cooling zone of billet continuous caster as a distributed parameter system has been performed, the results being compared with traditional PI fixed control law in anti-windup scheme. For this purpose, ProCAST casting simulation environment served as a numerical model of the casting process whereas the DPS Blockset for MATLAB & Simulink provided blocks for control synthesis in MATLAB/Simulink control design environment. The actual control process ran in a cosimulation regime with both environments interchanging their data synchronously via tailor-made cosimulation block from DPS Blockset (the actual data being controlled and manipulated variables, respectively).