Repetitive processes are a distinct class of 2D systems (i.e. information propagation in two independent directions) of both systems theoretic and applications interest. They cannot be controlled by direct extension o...
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Repetitive processes are a distinct class of 2D systems (i.e. information propagation in two independent directions) of both systems theoretic and applications interest. They cannot be controlled by direct extension of existing techniques from either standard (termed 1D here) or 2D systems theory. Here we give the first results on how feedback/feedforward control action can be used to influence one form of controllability for processes with discrete dynamics.
The paper presents the requirements of measurement system for electric arc furnace parameters measurement and for working characteristic calculating. On this basis measurement signals were specified and measurement al...
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The paper presents the requirements of measurement system for electric arc furnace parameters measurement and for working characteristic calculating. On this basis measurement signals were specified and measurement al...
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The paper presents the requirements of measurement system for electric arc furnace parameters measurement and for working characteristic calculating. On this basis measurement signals were specified and measurement algorithms were developed. For data acquisition a special system was constructed. The system consists of portable computer with acquisition card and conditioning system with differential amplifiers, antialiasing filters and sample and hold circuits. The system is connected with interface build-up permanent in arc furnace. The system software makes possible on-line observation of measured signals values and save data to hard disk. Further calculations may be performed off-line using special developed algorithms. For system software development the open source Python language and GCC compiler for Windows were used.
Parameter estimation of an autoregressive movmg average (ARMA) model is discussed in this paper by using bounding approach. Bounds on the model structure error are assumed unknown, or known but conservative. To reduce...
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Parameter estimation of an autoregressive movmg average (ARMA) model is discussed in this paper by using bounding approach. Bounds on the model structure error are assumed unknown, or known but conservative. To reduce this conservatism, a point-parametric model concept is proposed, where there exist a set of model parameters and structure error corresponding to each input. Feasible parameter sets are defined for point-parametric model. Bounded values on the model parameters and structure error can then be computed jointly by tightening the feasible set using observations under deliberately designed input excitations. Finally, a constantly bounded parameter model is established, which can be used for robust control.
The paper is devoted to the problem of modeling demand for inventory management of slow-moving items in the case of reporting errors. It is proposed a generalization of the beta-binomial demand model that takes into a...
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The paper is devoted to the problem of modeling demand for inventory management of slow-moving items in the case of reporting errors. It is proposed a generalization of the beta-binomial demand model that takes into account possible reporting errors in the learning sample. For the new model, there are developed identification and forecasting algorithms that provide consistent estimators of the model parameters and mean square optimal forecasts. The efficiency of the proposed approach is illustrated by an application example for slow-moving car parts.
New developments in computer networks and communications provide new possibilities for control purposes. control systems for highly complex plants are themselves very complex and heterogeneous. A new software infrastr...
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This paper represents a new technique for remapping the distributed object-oriented software methods to target architecture. This technique takes into consideration the advantages of the structure inherit in object-or...
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The present paper considers the problem of hazard in combinatorial logic structures . We start from time constants method but we shall prove that this is not error free (there are situations when this method fails to ...
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The present paper considers the problem of hazard in combinatorial logic structures . We start from time constants method but we shall prove that this is not error free (there are situations when this method fails to point hazards in a combinatorial logic circuit). So we shall define an improvement for this method, improvement that will consider, among other features, the specific function implemented by the gates used (we are mostly interested by the inverting characteristic). In this endeavor we shall define a new type of operator and a new type of variable, both of them applicable when propagating the switching times for a specific circuit. The mentioned method is a very laborious one (considers all the possibilities disregarding the specific function implemented by a circuit). We shall prove that only a strictly limited number of situations should be considered in conjunction with the function that is being implemented by the circuit analyzed. In order to achieve this goal we shall express the logic function with respect to a new logic variable that is dependent by time. Operations with this new variable prove to have some very interesting properties (that we prove in the paper) that will allow us to restrain the window of possibilities of hazardous functioning to a very narrow one.
A technique for real time path planning of under-actuated robots is developed. The real time path-planning problem is posed as a finite time nonlinear control problem, which is solved in parallel with an optimization ...
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A technique for real time path planning of under-actuated robots is developed. The real time path-planning problem is posed as a finite time nonlinear control problem, which is solved in parallel with an optimization technique in the real time. A new controller that is called the Fault Tolerant Motion controller (FTM) is developed. Also a new measure that we called the Reliability Index (RI) is proposed to monitor, instantly, the performance of the FTM. Simulation studies are presented.
This paper is concerned with an application study of model-based fault detection method to a ship propulsion system. When modeling the object system, Quasi-ARMAX model with multi-model form is used. In this model, the...
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