This work presents the theoretical study considerations and the characteristics of a general design methodology in optimal time for electronic systems using numerical methods and optimal control theory. Through this t...
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ISBN:
(纸本)9781457707599
This work presents the theoretical study considerations and the characteristics of a general design methodology in optimal time for electronic systems using numerical methods and optimal control theory. Through this theory the design problem of a system is formulated in terms of optimal control in minimal time. This general design methodology includes the traditional design strategy (TDS), where is possible to use different kind of optimization procedures and different models, but in each step solution is not possible to change these;the modified traditional design strategy (MTDS) is also included, where the model of the system is part of optimization procedure but an objective function of optimization process is constructed such includes the traditional objective function and some penalty functions that feign the model of the system. A whole of special control functions are introduced artificially to generalize the methodology and producing several design trajectories for the same optimization process, where the first and final trajectories correspond to TDS and MTDS respective. The combination of a whole these trajectories produce an infinite number of design strategies, some of these are quasi-optimal in time and only one is optimal in time. The determinations of switching points for the optimal construction algorithm are found using optimal control theory, whit approximation methods and through the special Lyapunov function. These ideas are proposed using the method of gradient optimization and acceleration effect. The analysis of some non linear electronic circuits models shows that this strategy can reduce the total number of operations many times and accelerate the design process. Qualitative and numeric results of this iterative process are generated in a personal computer in a C++ language elaborated program whit a visual C++ graphic user interface. The examples presented show that the traditional design methodology is not time optimal, and the potential ga
The thin-film acoustoelectric effect in surface acoustic wave (SAW) devices describes the interaction of electrical energy between a SAW in a piezoelectric medium and a thin-film placed in the wave's propagation p...
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The thin-film acoustoelectric effect in surface acoustic wave (SAW) devices describes the interaction of electrical energy between a SAW in a piezoelectric medium and a thin-film placed in the wave's propagation path. The real-time observation of the thin-film acoustoelectric interaction is useful in the design and characterization of SAW-based thin-film chemical and physical sensors (i.e. temperature, humidity, viscosity, voltage, current, hall effects, etc.). An in-situ test fixture was designed to be mechanically, thermally and electrically stable. Data has been taken for many SAW devices and over a wide range of frequencies. The results show that the use of the in-situ procedure yielded: good agreement between theoretical predictions and the measured data, characterization a SAW-H 2 gas sensor in real-time and various methods to calibrate the film deposition system and procedure. This paper presents the approach taken in configuring an electron beam evaporation system for ultra-thin-film characterization and the design of test fixtures, data acquisition configuration, and experimental procedures to extract and analyze SAW parameters in real time, and to extract the thin-film properties under test.
A sliding mode controller for uncertain systems is proposed in this paper. The class of system considered has matched and mismatched uncertainties. The design framework involves linear matrix inequality methods and po...
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This paper aims to design a robust H∞controlsystem against time invariant polytopic uncertainties. In general, such robust control problems are described by parameter dependent bilinear matrix inequality (PDBMI) pro...
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This paper provides a summary of several recently detailed recursive, filtering strategies as applied to the task of tracking deformable objects from a video sequence. Estimation theory provides the foundation for fil...
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A practical method is proposed in this paper to compute a lower bound on the worst-case H∞ performance for a linear time-invariant system affected by parametric uncertainties. The problem is first solved for a few fr...
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The performance of distributed controlsystems, apart from the sampling period, depends on many parameters, such as the control loop execution time, jitter and communication parameters of data transmission channels. L...
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The main aim of this paper is to improve and further develop numerical iterative methods for calculating the optimum sequence of switching angles for the multilevel converter of direct to alternating voltage in the th...
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A MATLAB based CAD Tool is presented for reduced order controller design based on a multi-model scheme. This multi-model scheme adaptively searches for the lowest order plant model which is then used to design a low o...
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