Power system stabilizers (PSS) play an important role in damping of power system oscillations. an intensive research activity has been devoted to design of their structure and optimal setting of their parameters. in t...
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in this paper, we propose an object recognition method for 2D objects using wavelet descriptors. The descriptors are derived from the continuous wavelet transform using the Mexican hat function as mother wavelet. in c...
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A genetic algorithm based controller design approach is described. The genetic algorithm represents an optimisation procedure, where the cost function to be minimized comprises the closed-loop simulation and a perform...
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Today's circuit design process is become a complex task. Sequential logic synthesis is an important part of the circuit design flow. The logic synthesis phase is a bottleneck during the overall design process sinc...
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The purpose of this paper is to show a simple ability of using neural networks in longitudinal vehicle guidance. The main motivation is an opportunity of neural networks to learn from acquired real driver data, as wel...
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In all mechanical devices, motors are subject to failures, which can sometimes lead to the shutting down of an entire industrial process. That is the reason why predictive maintenance and prognosis are necessary. Moto...
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In all mechanical devices, motors are subject to failures, which can sometimes lead to the shutting down of an entire industrial process. That is the reason why predictive maintenance and prognosis are necessary. Motor current signature analysis is a condition monitoring technique that is now widely used to diagnose problems such as broken rotor bars, abnormal levels of airgap eccentricity, shorted turns in low voltage stator windings and some mechanical problems. This paper presents the effect of the broken bar time evolution since the created incipient fault on the various characteristics of the induction machine such as torque, speed and currents. The methods used for analysis are based on: the Lissajous representation of Park vector current components spectral analysis of stator current and the modulus of Park vector current.
The correlation between electric disturbances and vibration, as well as audible noise in marine frequency controlled AC drive systems was examined. The destructive influence of these factors on quality of life of a se...
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ISBN:
(纸本)9789638658647
The correlation between electric disturbances and vibration, as well as audible noise in marine frequency controlled AC drive systems was examined. The destructive influence of these factors on quality of life of a sea going vessel's crew was indicated.
The paper proposes a new frequency domain approach to the design of robust decentralized controllers (DC) for continuous-time systems described by a set of transfer function matrices. To guarantee the nominal stabilit...
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The paper proposes a new frequency domain approach to the design of robust decentralized controllers (DC) for continuous-time systems described by a set of transfer function matrices. To guarantee the nominal stability and the prespecified nominal performance, the recently developed DC design technique (Kozáková and Veselý, 2003) has been applied, adapted so as to guarantee the robust M -δ structure based stability conditions modified for the closed-loop system under decentralized controller as well. Unlike the standard robust approaches to the DC, this technique allows the inclusion of the nominal interactions into the nominal model; thus the conservativeness of the robust stability conditions is relaxed.
Uncertain or unknown parameters are often an essential part in several biological or technical applications represented by nonlinear systems. These uncertainties cause numerical and analytical problems in finding guar...
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Uncertain or unknown parameters are often an essential part in several biological or technical applications represented by nonlinear systems. These uncertainties cause numerical and analytical problems in finding guaranteed bounds for the solution of the state space representation for such systems. Unfortunately several industrial applications are demanding exactly these guaranteed bounds in order to fulfil regulations by the state authorities. A common and well known method to perform simulations with uncertain parameters is the Monte-Carlo method. This method with its stochastic approach cannot deliver guaranteed bounds. Methods using interval arithmetic provide a lot of overestimation. Thus we have to develop a novel method to find guaranteed bounds as an initial interval for further methods based on interval arithmetic. In this scope a new method is presented which is using a linear Lyapunov like functions to solve this problem. We achieve guaranteed and finite simulation bounds as a result of our approach. The idea is to find an auxiliary function, which helps to bind the state variables. An example from an industrial application completes the paper.
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