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Closed Loop Fault Detectability Based on a Gap-Metric

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Closed Loop Fault Detectability Based on a Gap-Metric

control Technology and Applications (CCTA),

作者： André Sekunda Steven Ding Niels Kjølstad Poulsen Henrik Niemann Department of Electrical Engineering Automation and Control Tech. University of Denmark Denmark Dept. of Automatic Control and Complex Systems University of Duisburg-Essen Duisburg Germany Dept. of Applied Mathematics and Computer Science Tech. University of Denmark Kgs. Lyngby Denmark

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.

关键词： Fault diagnosis Measurement Kernel Closed loop systems Fault detection Sensors

Conducting Online Lab Experiments with Blockly

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IFAC-PapersOnLine 2017年第1期50卷 13474-13479页

作者： Galan, Daniel Heradio, Ruben de la Torre, Luis Dormido, Sebastian Esquembre, Francisco Dept. of Computer Science and Automatic Control Universidad Nacional de Educación a Distancia Juan del Rosal 16 MadridE-28040 Spain Dept. of Software Engineering and Computer Systems Universidad Nacional de Educación a Distancia Juan del Rosal 16 MadridE-28040 Spain Dept. of Mathematics Universidad de Murcia Campus de Espinardo MurciaE-30071 Spain

Laboratory experimentation plays an essential role in control education. To reduce the high costs of maintaining apparatus in traditional labs and to support distance and blended learning, online laboratories are used as a possible alternative to conventional hands-on labs. In these labs it is often desirable to allow students to define their own experiments. This paper presents the definition and implementation of a generic experimentation language for conducting automatic experiments on existing online laboratories. The main objective is to use an online lab, created independently, as a component in which users can perform experiments. To achieve it, authors present the Experiment Application. It is composed by Blockly, to define and design the experiments, and Google Chart, review and visualize the experiment results. This tool offers benefits to students, teachers and, even, lab designers. For the moment, it can be used with any existing lab or simulation created with the authoring tool Easy Java(script) Simulations. Since there are repositories with hundreds of free available labs created with this tool, the potential applicability of the described tool is considerable. To illustrate the utility of the Experiment Application a very well-known system is used: the Simple Harmonic Oscillator system. © 2017

关键词： computer software Experiments Research laboratories Teaching Blockly Easy java(script) Simulations Experimentation Language Javascript Remote laboratories Virtual laboratories

Hybrid petri net model based decision support system

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arXiv 2017年

作者： Culita, Janetta Caramihai, Simona Munteanu, Calin Politehnica" University of Bucharest Dept. of Automatic Control and Computer Science

It is well known that the complex system operation requires the use of new scientific tools and computer simulation. This paper presents a modular approach for modeling and analysis of the complex systems (in communication or transport systems area) using Hybrid Petri nets. The performance evaluation of the hybrid model is made by a simulation methodology that allows building up various functioning scenario. A Decision Support System based on the above mentioned methodologies of modeling and analysis will be designed for performance evaluation and time optimization of large scale communication and/or transport systems. Copyright © 2017, The Authors. All rights reserved.

关键词： Decision support systems

A cooperative enterprise agent based control architecture

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arXiv 2017年

作者： Caramihai, Simona Dumitrache, Ioan Stanescu, Aurelian Culita, Janetta Politehnica University of Bucharest Dept. of Automatic Control and Computer Science

The paper proposes a hierarchical, agent-based, DES supported, distributed architecture for networked organization control. Taking into account enterprise integration engineering frameworks and business process management techniques, the paper intends to apply control engineering approaches for solving some problems of coordinating networked organizations, such as performance evaluation and optimization of workflows. Copyright © 2017, The Authors. All rights reserved.

关键词： Enterprise resource management

A DECISION SUPPORT SYSTEM FOR COMMUNICATION NETWORK ANALYSIS BASED ON HYBRID PETRI NET MODELS

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arXiv 2017年

作者： Caramihai, Simona Iuliana Munteanu, Călin Culiţă, Janetta Politehnica" University of Bucharest Dept. of Automatic Control and Computer Science Romania

It is well known that the complex system operation requires the use of new scientific tools and computer simulation. This paper presents a modular approach for modeling and analysis of the complex systems (in communication or transport systems area) using Hybrid Petri nets. The performance evaluation of the hybrid model is made by a simulation methodology that allows building up various functioning scenarios. A Decision Support System based on the above mentioned methodologies of modeling and analysis will be designed for performance evaluation and time optimization of large scale communication and/or transport systems. Copyright © 2017, The Authors. All rights reserved.

关键词： Decision support systems

Event-based selective control strategy for raceway reactor: A simulation study

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IFAC-PapersOnLine 2016年第7期49卷 478-483页

作者： Pawlowski, A. Frenández, I. Guzmán, J.L. Berenguel, M. Acién, F.G. Dormido, S. Dept. of Computer Science and Automatic Control UNED Madrid Spain Dept. of Computer Science University of Almería ceiA3 CIESOL Almería Spain Dept. of Chemical Engineering University of Almería ceiA3 CIESOL Almer´ia Spain

This work presents a simulation study of an event-based selective control strategy for a raceway reactor. The control system aims are to maintain simultaneously a pH and dissolved oxygen within specific limits. In the analyzed control scheme, the pH value is prioritized over the dissolved oxygen, since it has a critical influence on the process performance. Besides, the dissolved oxygen also influences the photosynthesis rate and should be kept within the limits. The control structure is evaluated through simulation, where a nonlinear model for microalgae culture in the raceway photobioreactor is used. Analysis of different configurations allows to determine the most adequate control system setup to achieve the desired goals. The obtained results show that combination of an event-based approach with selective control allows to increase the overall productivity as well as to address effective CO2utilization and aeration system energy minimization. © 2016

关键词： Dissolved oxygen Algae control systems Dissolution Microorganisms Dissolved oxygen control Micro algae PH control raceway reactor Selective control

Kalman filtering of distributed time series

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arXiv 2017年

作者： Stefanoiu, Dan Culita, Janetta "Politehnica" University of Bucharest Dept. of Automatic Control and Computer Science 313 Splaiul Independentei Bucharest060032 Romania

This paper aims to introduce an application to Kalman Filtering Theory, which is rather unconventional. Recent experiments have shown that many natural phenomena, especially from ecology or meteorology, could be monitored and predicted more accurately when accounting their evolution over some geographical area. Thus, the signals they provide are gathered together into a collection of distributed time series. Despite the common sense, such time series are more or less correlated each other. Instead of processing each time series independently, their collection can constitute the set of measurable states provided by some open system. Modeling and predicting the system states can take benefit from the family of Kalman filtering algorithms. The article describes an adaptation of basic Kalman filter to the context of distributed signals collections and completes with an application coming from Meteorology. Copyright © 2017, The Authors. All rights reserved.

关键词： Kalman filters

Blogcrawl: Customized crawling of online communities

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UPB Scientific Bulletin, Series C: Electrical Engineering an...

UPB Scientific Bulletin, Series C: Electrical Engineering and computer science 2017年第2期79卷 3-14页

作者： Stavarache, Lucia Larise Balint, Mihaela Dascalu, Mihai Trausan-Matu, Stefan Nistor, Nicolae Dept. of Computer Science University Politehnica of Bucharest Romania Faculty of Automatic Control and Computers University Politehnica of Bucharest Research Institute for Artificial Intelligence of the Romanian Academy Academy of Romanian Scientists Romania Ludwig-Maximilians-Universität München Germany Walden University United States

With half of the world already connected to the Internet, we are facing a growing amount of information available online, that is expected to increase exponentially in the following years. Educational environments are transitioning from closed structures to open, collaborative environments, using technology to build virtual classrooms. In this paper we present a customized crawler dedicated to alternative knowledge building environments used for potential community inquiry, that is unique in its power to combine data extraction and indexing capabilities that facilitate discourse-driven community network analysis integrated into the ReaderBench framework.

关键词： computer aided instruction

Clustering in block Markov chains

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arXiv 2017年

作者： Sanders, Jaron Proutière, Alexandre Yun, Se-Young Kth Royal Institute of Technology School of Electrical Engineering Dept. of Automatic Control Osquldasväg 10 Stockholm10044 Sweden Delft University of Technology Faculty of Electrical Engineering Mathematics and Computer Science Dept. of Quantum and Computer Engineering Mekelweg 4 Delft2628CD Netherlands Korea Advanced Institute of Science and Technology Dept. of Industrial and Systems Engineering 291 Daehak-ro Eoeun-dong Yuseong-gu Korea Republic of

This paper considers cluster detection in Block Markov Chains (BMCs). These Markov chains are characterized by a block structure in their transition matrix. More precisely, the n possible states are divided into a finite number of K groups or clusters, such that states in the same cluster exhibit the same transition rates to other states. One observes a trajectory of the Markov chain, and the objective is to recover, from this observation only, the (initially unknown) clusters. In this paper we devise a clustering procedure that accurately, efficiently, and provably detects the clusters. We first derive a fundamental information-theoretical lower bound on the detection error rate satisfied under any clustering algorithm. This bound identifies the parameters of the BMC, and trajectory lengths, for which it is possible to accurately detect the clusters. We next develop two clustering algorithms that can together accurately recover the cluster structure from the shortest possible trajectories, whenever the parameters allow detection. These algorithms thus reach the fundamental detectability limit, and are optimal in that sense. Copyright © 2017, The Authors. All rights reserved.

关键词： Asymptotic analysis