ELECTRICAL POWER ENGINEERING
The electric drive system with a predicting model makes it possible to ensure control in accordance with a selected optimum criterion at the given limitations on coordinates under conditions of changeable parameters and external actions on an object to be controlled within permissible boundaries. The proposed control system presupposes to build a predicting model on the basis of an optimized object in accordance with an optimum criterion. While constructing the model it is necessary preliminary to distinguish a mathematical description of three higher external coordinates.
The object model acquires prediction properties after setting scale time coefficients in it. The proposed predicting model permits to exclude immediate rapid time calculations of a control value.Basic structural and functional components of the control system project are control algorithm, control program, principle scheme, scheme of electrical equipment arrangement, schemes of driving mechanisms, etc. The system of predicate formulae (SPF) as a formalized resident model has been selected to be the gist of the project.
Method of evental modeling for SPF, due to which results are reflected on the enumerated non-formalized parts of the project, is realized. This modeling is called distributed.НEAT POWER ENGINEERING
The method of calculation and results of computer dynamics modeling of solid ingot skin in a crystallizer are presented in the paper. The paper shows influence of ingot drawing rate on dynamics of solid ingot skin growth in the continuous casting machine at steel grades used at Republic Unitary Enterprise «Belarussian Metallurgical Works» (BMZ).
The paper involves analytical solutions and formulae for determination of the oxide film thickness in the silicon oxidation while using nitride mask. Calculations are based on solutions of a three-dimensional diffusion equation and new mathematical functions that are firstly defined by the author. Suitable analytical and numerical solutions based on the diffusion equation have not yet been obtained
The purpose of the paper-is to construct a mathematical model that makes it possible to investigate and modify design and heat technological models of units intended for heating and thermal treatment of products with due account of all parameters affecting the quality of the process proceeding. Orthogonal Bubnov-Galiorcin method has been used to solve boundary equation problems of heat conduction with corresponding initial and limiting conditions of the first, second and third origin. Maximum error of the results obtained with the help of the proposed model does not exceed 3,7 %, that testifies its adequacy and proves its possible usage with the purpose to optimize heating and thermal treatment processes of products.
ISSN 2414-0341 (Online)
