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EUROSIM Congress on Modelling and Simulation (EUROSIM)

作者： Alberto de la Calle Luis J. Yebra Sebastián Dormido Automatic Control Group CIEMAT-Plataforma Solar de Almería Tabernas Spain Dept. of Computer Science and Automatic Control UNED Madrid Spain

Falling film evaporators and condensers have demonstrated a good performance in air-conditioning and refrigeration. A study of falling film evaporation and condensation models is presented in this document. Two different evaporator models and a condenser model are being developed considering a trade-off between efficiency and accuracy. These models are based on classical Newton's viscosity law and Nusselt falling film theory. Two libraries, with evaporator and condenser components, compatible with Modelica. Fluid, Modelica. Thermal and Modelica. Media have been implemented. The presented simulations have the expected behaviour. These models will be used to complete a model of a heat pump.

关键词： Electron tubes Heat transfer Mathematical model Libraries Atmospheric modeling Generators Thermodynamics

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Pros and cons of horizontal axis wind turbines linear identification

Frontiers in Artificial Intelligence and Applications

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Frontiers in Artificial Intelligence and Applications 2012年 243卷 684-695页

作者： Stefanoiu, Dan Tudor, Florin Sebastian Politehnica University of Bucharest Dept. of Automatic Control and Computer Science 313 Splaiul Independentei Bucharest-060042 Romania

ISBN: (纸本)9781614991045

This article outlines some of the advantages and disadvantages of wind turbines linear identification, in case of minimal number of measuring channels. The identified turbine has horizontal axis and belongs to middle size class. Multi-variable models of linear type (Box-Jenkins (BJ) / ARMAX, state space representation) are estimated and compared in terms of fitness in time, as well as in frequency. All models are validated by data acquired from a running turbine, in conditions of variable but rather weak wind activity. Linear models do not match very well HAWTs, though some BJ models are behaving fairly. © 2012 The authors and IOS Press. All rights reserved.

关键词： Horizontal axis wind turbine

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NEW DIRECT DISCRETIZATION OF THE FRACTIONAL-ORDER DIFFERENTIATOR/INTEGRATOR BY THE CHEBYSHEV-PADÉ APPROXIMATION

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IFAC Proceedings Volumes 2006年第11期39卷 269-273页

作者： A.P. de Madrid C. Mañoso R. Hernández Dept. of Computer Science and Automatic Control Computer Science School. Juan del Rosal 16. 28040 – Madrid (Spain)

This paper deals with the use of the Chebyshev-Padé approximation (CP) in order to achieve accurate direct discrete-time approximations to the fractional-order differentiator/integrator. It is shown how, for a given order of the transfer functions, CP is much more accurate at low frequencies than the continued fraction expansion (CFE). Furthermore, CP can be more accurate than a CFE approximation of a higher order.

关键词： Fractional-order differentiator/integrator Fractional calculus Fractional-order systems Chebyshev-Padé approximation Continued fraction expansion Integer-order approximation Backward differentiation rule Tustin operator Al-Alaoui operator Discretization

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From high-level task descriptions to executable robot code

Advances in Intelligent Systems and Computing

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Advances in Intelligent Systems and Computing 2015年 323卷 189-202页

作者： Stenmark, Maj Malec, Jacek Stolt, Andreas Dept. of Computer Science Lund University Lund221 00 Sweden Dept. of Automatic Control Lund University Lund221 00 Sweden

For robots to be productive co-workers in the manufacturing industry, it is necessary that their human colleagues can interact with them and instruct them in a simple manner. The goal of our research is to lower the threshold for humans to instruct manipulation tasks, especially sensor-controlled assembly. In our previous work we have presented tools for high-level task instruction, while in this paper we present how these symbolic descriptions of object manipulation are translated into executable code for our hybrid industrial robot controllers. © Springer International Publishing Switzerland 2015.

关键词： Robots

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Closed Loop Fault Detectability Based on a Gap-Metric 2

Closed Loop Fault Detectability Based on a Gap-Metric

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2nd IEEE Conference on control Technology and Applications, CCTA 2018

作者： Sekunda, Andre Ding, Steven Kjolstad Poulsen, Niels Niemann, Henrik Department of Electrical Engineering Automation and Control Tech. University of Denmark Kgs. LyngbyDk-2800 Denmark Dept. of Automatic Control and Complex Systems University of Duisburg-Essen Duisburg47057 Germany Dept. of Applied Mathematics and Computer Science Tech. University of Denmark Kgs. LyngbyDk-2800 Denmark

ISBN: (纸本)9781538676981

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. © 2018 IEEE.

关键词： Fault detection

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Reduced Relative Errors for Short Sequence Counting with Differential Privacy

Reduced Relative Errors for Short Sequence Counting with Dif...

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International Conference on control Systems and computer Science (CSCS)

作者： Sergiu Costea Gabriel Ghinita Rvzvan Rughinis Nicolae Tapus Faculty of Automatic Control and Computer Science University POLITEHNICA of Bucharest Dept. of Computer Science University of Massachusetts Boston

Current concerns about data privacy have lead to increased focus on data anonymization methods. Differential privacy is a new mechanism that offers formal guarantees about anonymization strength. The main challenge when using differential privacy consists in the difficulty in designing correct algorithms when operating on complex data types. One such data type is sequential data, which is used to model many actions like location or browsing history. We propose a new differential privacy algorithm for short sequence counting called Recursive Budget Allocation (RBA). We show that RBA leads to lower relative errors than current state of the art techniques. In addition, it can also be used to improve relative errors for generic differential privacy algorithms which operate on data trees.

关键词： Databases Data privacy Privacy Noise Resource management Vegetation Estimation

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Trust region policy optimization with optimal transport discrepancies: duality and algorithm for continuous actions 22

Trust region policy optimization with optimal transport disc...

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Proceedings of the 36th International Conference on Neural Information Processing Systems

作者： Antonio Terpin Nicolas Lanzetti Batuhan Yardim Florian Dörfler Giorgia Ramponi Automatic Control Laboratory ETH Zürich Dept. of Computer Science ETH Zürich Dept. of Computer Science ETH AI Center

ISBN: (纸本)9781713871088

Policy Optimization (PO) algorithms have been proven particularly suited to handle the high-dimensionality of real-world continuous control tasks. In this context, Trust Region Policy Optimization methods represent a popular approach to stabilize the policy updates. These usually rely on the Kullback-Leibler (KL) divergence to limit the change in the policy. The Wasserstein distance represents a natural alternative, in place of the KL divergence, to define trust regions or to regularize the objective function. However, state-of-the-art works either resort to its approximations or do not provide an algorithm for continuous state-action spaces, reducing the applicability of the method. In this paper, we explore optimal transport discrepancies (which include the Wasserstein distance) to define trust regions, and we propose a novel algorithm - Optimal Transport Trust Region Policy Optimization (OT-TRPO) - for continuous state-action spaces. We circumvent the infinite-dimensional optimization problem for PO by providing a one-dimensional dual reformulation for which strong duality holds. We then analytically derive the optimal policy update given the solution of the dual problem. This way, we bypass the computation of optimal transport costs and of optimal transport maps, which we implicitly characterize by solving the dual formulation. Finally, we provide an experimental evaluation of our approach across various control tasks. Our results show that optimal transport discrepancies can offer an advantage over state-of-the-art approaches.

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Object-oriented modeling for remote monitoring of manufacturing processes

Object-oriented modeling for remote monitoring of manufactur...

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International Conference on Emerging Technologies and Factory Automation (ETFA)

作者： M. Marcos I. Calvo D. Orive I. Sarachaga J.M. Fuertes P. Marti R. Villa S. Buzoianu Department of Automatic Control and Systems Engineering University of Basque Country (UPV-EHU) Bilbao Spain Dept. of Automatic Control and Systems Engineering University of the Basque Country Bilbao SPAIN Dept. of Automatic Control and Computer Engineering Technical University of Catalonia Barcelona SPAIN

ISBN: (纸本)0780372417

Deals with the use of object oriented technologies in the modeling of industrial plants that have to be remotely monitored and/or controlled. The main goal is to propose a design methodology for obtaining the model of the so-called Virtual Plant, that a remote and certified user will use to access the real plant for performing command actions and/or monitoring. The type of applications and systems targeted must have autonomous behavior and be interconnected and accessible. Reliability, maintainability and flexibility are also required goals, as well as a high rate of reusability of the applications. The methodology has been applied to the remote process monitoring and control of manufacturing processes. The Virtual Plant Model is, in fact, the part of the plant that can be accessed by a certified remote client and thus it can be constituted by a set of sub-models, as many as different types of clients. The Virtual Plant resides inside the Application Server who is responsible of communicating with the cell controller and sends the image of the actual plant state (the Virtual Plant) as required by the remote client (monitoring) or sends the client commands to the cell controller.

关键词： Object oriented modeling Remote monitoring Manufacturing processes automatic control Internet Process control Systems engineering and theory Paper technology Industrial plants computerized monitoring

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Mapping different communication traffic over DDS in industrial environments

Mapping different communication traffic over DDS in industri...

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作者： Etxeberria-Agiriano, Ismael Calvo, Isidro Pérez, Federico De Albeniz, Oier Garcísa Dept. of Computer Languages and Systems University of the Basque Country C/Nieves Cano 12 01006 Vitoria-Gasteiz Spain Dept. of Automatic Control and Systems Engineering University of the Basque Country C/Nieves Cano 12 01006 Vitoria-Gasteiz Spain

ISBN: (纸本)9789899624757

This paper describes the different communication patterns followed in industrial communications and maps them into DDS (Data Distribution Service) which is a recent middleware specification. This specification follows the publisher/subscriber paradigm and it is characterized by providing an API that allows tuning the QoS (Quality of Service) of the applications with a large set of parameters. This paper proposes using DDS as the backbone for industrial communications at the control level. In particular, we advocate its use to combine sending critical information such as alarms and real-time periodic information with less critical information related to configuration, diagnostic or maintenance operations. © 2011 AISTI.

关键词： Quality of service

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Mobile Application for Visualizing the Measurements 5

Mobile Application for Visualizing the Measurements

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5th IEEE International Conference on Modern Electrical and Energy System, MEES 2023

作者： Kiresova, Simona Guzan, Milan Sobota, Branislav Melnykov, Viacheslav Yatsiuk, Rostyslav Peryvertailo, Bohdan Technical University of Košice Dept. of Theoretical and Industrial Electrical Engineering Košice Slovakia Technical University of Košice Dept. of Computers and Informatics Košice Slovakia Kremenchuk Mykhailo Ostrohradskyi National University Dept. of Systems of Automatic Control and Electric Drive Kremenchuk Ukraine National University Dept. of Computer Engineering and Electronics Kremenchuk Mykhailo Ostrohradskyi Kremenchuk Ukraine

ISBN: (纸本)9798350359787

This paper deals with the design of an Android mobile application and visualization of the measured values of particulate matter and meteorological factors from the measurement stations. The application can in principle be effectively used in any field of data visualization. The architecture of the mobile application, the security, the use of AWS services to access the data in the InfluxDB databases, as well as the user interface and graphical visualizations of the measured data are described and illustrated. The application is user tested and the paper documents their first experiences using the mobile application. © 2023 IEEE.

关键词： Visualization

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