Variable Structure System for Electric Arc Furnace Control
Variable structure controllers that can be effectively applied to control an electric arc furnace are investigated in this paper. A gereral formulation and solution of the variable structure system design problem is presented together with some guidlines for the choice of a suitable model following. A state space reduction method is applied to reduce the dominant dynamic order and hence simplify the design process. The effects of switching surface, modelling, gain polarity and magnitude are discussed.
This paper systematically analyzes main factors affecting the decision of bracing system for deep foundation pits; establishes an index system of evaluation scheme and a multiobjective fuzzy optimum model of bracing schemes through fuzzy mathematical theory; and puts forward rational methods of the definiteness of objective weight and quantitating qualitative objects. A case study shows that the decision method is effective and easy to operate.