Systems are often controlled using feedback loops. Fault diagnosis schemes are usually designed assuming that there is no feedback loop. Therefore fault diagnosis methods need to accommodate for the feedback loop. One...
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Systems are often controlled using feedback loops. Fault diagnosis schemes are usually designed assuming that there is no feedback loop. Therefore fault diagnosis methods need to accommodate for the feedback loop. One such method is active fault diagnosis based on a fault signature system. This method is derived using the YJBK parametrisation, named after Youla, Jabr, Bongiorno and Kucera. It uses the derived fault signature system to determine the detectability of possible faults in the system. Deriving the fault signature system requires knowledge about the controller. This paper demonstrates the possibility of estimating the detectability of faults in the fault signature system using a gap-metric. The gap-metric has the advantage of only requiring knowledge about the plant. By using the gap-metric it is possible to estimate the detectability of faults without using information about the controller.
Solving Lur'e equations plays a critical role in addressing linear-quadratic optimal control (LQOC) problems, especially in cases where the control cost matrices are singular. This paper introduces, for the first ...
Solving Lur'e equations plays a critical role in addressing linear-quadratic optimal control (LQOC) problems, especially in cases where the control cost matrices are singular. This paper introduces, for the first time, two novel zeroing neural network (ZNN) models—ZNNLE and ZNNLE-LQOC—specifically designed to solve the Lur'e equation system and the LQOC problem, respectively. The proposed models extend the applicability of the ZNN methodology to these challenging scenarios by offering robust and efficient solutions to time-varying matrix equations. Theoretical analyses confirm the validity of both models, while numerical simulations and practical applications demonstrate their effectiveness. Moreover, a comparative study with an enhanced alternating-direction implicit (ADI) method highlights the superior performance of the ZNNLE-LQOC model in solving LQOC problems.
This paper deals with the problem of controlling linear complex networks in an efficient way, i.e., with limited control energy. A general principle is provided, based on the eigenvalues of the network. It is shown nu...
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The aim of this paper is to investigate the problem of selecting driver nodes enabling the control of a network with minimal control energy. The networks we are interested in are coupled harmonic oscillators, i.e., ne...
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In this paper, we study the problem of controlling complex networks with unilateral controls, i.e., controls which can assume only positive or negative values, not both. Given a network with linear dynamics represente...
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When dealing with epidemic spread, a very common And dangerous situation is the presence of an epidemic disease and a complication, especially in an elderly population or a weakened one. In this case the complication,...
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When dealing with epidemic spread, a very common And dangerous situation is the presence of an epidemic disease and a complication, especially in an elderly population or a weakened one. In this case the complication, that alone is not, in general, a fatal disease, may become risky. The ad hoc resource allocation becomes a mandatory task, aiming at the most rationale control strategy. This is the aim of this work, in which a new model is introduced; five classes are considered: the susceptible one, the class of people that has got the immunity from the first dangerous disease (but not from the complication), the class of patients with first disease, the class of those in the risky situation of having both the diseases, and the category of individuals with only the second disease that can still caught the first serious one. control actions are introduced, as vaccination and medication, studying the effects of the different strategies. Preliminary simulation results evidenced the effectiveness of the proposed approach, allowing to determine a control strategy that reduces the number of dead, with an efficient resource allocation.
In this paper the problem of the HIV/AIDS spread reduction is addressed in the framework of optimal control theory. A model recently proposed has been adopted; it considers two classes of susceptible subjects, the wis...
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In this paper the problem of the HIV/AIDS spread reduction is addressed in the framework of optimal control theory. A model recently proposed has been adopted; it considers two classes of susceptible subjects, the wise people and the people with incautious behaviors, and three classes of infected, the ones still not aware of their status, the pre-AIDS patients and the AIDS ones. The control actions involve prevention by information campaign, to reduce the category of subjects with unwise behavior, by test campaign, to reduce the number of subjects not aware of having the virus, and medication on patients with a positive diagnosis. A cost index aiming at the reduction of patients with positive diagnosis is introduced with the conflicting requirements of using as less resources as possible.
Various wide-band multiple source detection and direction-of-arrival (DOA) estimation using array methods have been proposed. For multiple wide-band 2D source DOA estimation, an Approximate Maximum-Likelihood (AML) me...
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This paper presents practical experiences in an inverter-based microgrid installed at SEPIC research laboratory (Technical University of Catalonia, Spain). These experiences validate recent developments in the control...
ISBN:
(纸本)9781839531330
This paper presents practical experiences in an inverter-based microgrid installed at SEPIC research laboratory (Technical University of Catalonia, Spain). These experiences validate recent developments in the control of power electronics-based distributed generators which confirm the opportunity to provide auxiliary services for the utility grid. Harmonic rejection, voltage imbalance reduction, fault-ride through capability, and voltage and frequency regulation are some of the auxiliary services designed to improve the power quality of the future grid.
In-field test of electronic devices is becoming increasingly important due to the wide adoption of electronic systems in safety-critical applications. Hence, it is crucial to devise and deploy effective solutions supp...
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