Modelling and robust control of temperature fields in casting mould

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Most of the dynamical systems analysed in engineering practice have the dynamics, which depends on both position and time. Such systems are classified as distributed parameter systems (DPS). The casting technology is a typical case of the DPS. There in order to obtain the desired structure during solidification, the process requires a specific temperature field of the mould, which is defined on complex-shape 3D definition domain. Modelling, simulation and evaluation of re­al-time experiments in this area is now widely accepted as an important tool in product design and process development to improve productivity and casting quality.

 

For analysis of the casting process dynamics as DPS, especially temper­ature fields in the casting mould and control synthesis purposes, the benchmark casting plant with steel mould of complex-shape was de­signed. Temperature fields of the mould for casting processes in this benchmark were also modelled and studied by means of finite elements method (FEM) in the software environment COMSOL Multiphysics. Based on this FEM modelling, numerical models for DPS control syn­thesis purpose in the form of a lumped-input/distributed-output system (LDS) were created.

Next, uncertainty analysis of the models both in time and space domain was performed and robust control synthesis with internal model control (IMC) structure has been designed. Simulation of the robust control of temperature fields in the casting mould and afterwards real-time exper­iment in accordance to casting technology requirements was carried out using the Distributed Parameter Systems Blockset for MATLAB & Sim­ulink, a third-party software product of The MathWorks, developed at the Institute of Automation, Measurement and Applied Informatics, Fac­ulty of Mechanical Engineering STU Bratislava.

 

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TEXT/PHOTOS PROF. ING. CYRIL BELAVÝ, CSC., ING. MARCEL VLČEK, ING. FILIP VITÁLOŠ, ING. BORIS BARBOLYAS, SLOVAK UNIVERSITY OF TECHNOLOGY IN BRATISLAVA, FACULTY OF MECHANICAL ENGINEERING, INSTITUTE OF AUTOMATION, MEASUREMENT AND APPLIED INFORMATICS, BRATISLAVA

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