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Decentralized PID control with inverted decoupling and superheating reference generation for efficient operation: Application to the Benchmark PID 2018

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IFAC-PapersOnLine 2018年第4期51卷 710-715页

作者： Garrido, J. Lara, M. Ruz, M.L. Vázquez, F. Alfaya, J.A. Morilla, F. Computer Science and Numerical Analysis Department University of Cordoba Cordoba14071 Spain Systems Engineering and Automatic Control Department University of Sevilla Sevilla41092 Spain Computer Science and Automatic Control Department UNED Madrid Spain

This paper deals with the control problem of a refrigeration vapor compression system proposed as a benchmark for the IFAC Conference on Advances in PID controllers (PID'18). This refrigeration system is a multivariable nonlinear process that shows interactions and is subjected to input constraints. In this work, a decentralized PID control with inverted decoupling is proposed as control structure. The inverted decoupling is designed from an approximated multivariable linear model. Then, the PID controllers are tuned by genetic algorithms to minimize a performance index. In addition, a superheat reference generation is developed to achieve stationary operation points with maximum coefficient of performance which is a widespread efficiency measurement in these systems. Simulations considered in the benchmark show that the proposed design achieves better performance than the reference case. © 2018

关键词： Three term control systems Benchmarking controllers Electric control equipment Genetic algorithms Proportional control systems Vapor compression refrigeration Coefficient of Performance Decentralized PID control Decoupling controls Efficiency measurement Optimal operation Stationary operations Vapor compression refrigeration cycle Vapor compression systems

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Low cost air invitation remote lab 4

Low cost air invitation remote lab

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4th Experiment at International Conference, exp.at 2017

作者： Sáenz, Jacobo Chacón, Jesús De La Torre, Luis Dormido, Sebastián Department of Computer Science and Automatic Control Computer Science School UNED Spain

ISBN: (纸本)9781538608104

Online experimentation have become a common resource in education since the virtual and remote labs (VRLs) allowed the users to interact with a system without been in a laboratory environment. The science and engineering areas needs to teach their student in experimental practices and this implies, in most cases, costly and complex systems. This work shows how new technologies allows a low cost online laboratory. © 2017 IEEE.

关键词： Cost engineering

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QFT multivariable control for the longitudinal dynamics of an air vehicle 9

QFT multivariable control for the longitudinal dynamics of a...

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9th International Conference on Electrical and control Technologies, ECT 2014

作者： Alcubilla, Javier Joglar Almansa, Joaquín Aranda Automatic Control and Computer Science Department UNED Madrid Spain

ISBN: (纸本)9781634398039

Quantitative Feedback Theory (QFT) requires working with square plants or, in some cases using procedures of "squaring-down", it is possible to use more inputs than outputs, although always in a process of input variables reducing, which involve loss of plant characteristics. The procedure of "squaring up" using MIMO-QFT compensation allows working with plants with underactuated uncertainty, ie with more outputs than inputs, in a process without specifications suppression of the control system. Furthermore, in the design process we incorporate optimization of the control effort, as to track as to regulation. © Kaunas University of Technology, 2014.

关键词： Design

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Design of a stabilization control system for high-speed crafts based on robust techniques. Two different approaches 11

Design of a stabilization control system for high-speed craf...

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11th IEEE Conference on Industrial Electronics and Applications, ICIEA 2016

作者： Muñoz-Mansilla, Rocío Díaz, José Manuel Chaos, Dictino Aranda, Joaquín Department of Computer Science and Automatic Control UNED Madrid Spain

ISBN: (纸本)9781509026050

This work handles the design of a stabilization control for a high-speed craft in order to improve comfort and security in maritime transport. The goal is to damp the coupled dynamics of heave, pitch and roll by using active stabilization surfaces such as flaps, T-foil and fins. The methodology used is based on the Quantitative Feedback Theory (QFT) robust technique. Two approaches depending on the degree of coupling are presented. In the first approach, controllers for the longitudinal and transversal dynamics are designed separately and afterwards the actuator coupling is considered. The second approach provides a solution in cases where the effect of the actuator coupling is large. Hence, a combination of QFT and Eigenstructure Assignment (EA) methods is used. For both methods, time-domain simulations analyses for different conditions of sea state and angles of incidence provide satisfactory results and achieve damped responses. It is shown that robust techniques based on QFT methodology result feasible and very suitable since the problem can be applied to any angle of incidence and only one controller is required for any speed or sea state. Therefore they constitute attractive alternatives in the application of a stabilization control of an advanced marine system. © 2016 IEEE.

关键词： Robust control

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Open Service-Oriented Platforms for Personal Learning Environments

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IEEE INTERNET COMPUTING 2013年第4期17卷 26-31页

作者： Ros, Salvador Hernandez, Roberto Robles-Gomez, Antonio Caminero, Agustin C. Tobarra, Llanos Sancristobal Ruiz, Elio Control and Communication Systems Department Spanish University for Distance Education (UNED) UNED School of Computer Science

Learning management systems (LMSs) are software systems for administrating, tracking, and reporting on e-learning programs. The authors' third-generation LMS provides a personal learning environment (PLE) in which LMS functions are integrated into a context that users are familiar with and use for other purposes - that is, mashup platforms that use gadgets. By modularizing LMS functionality as a collection of services, the system lets users select the services they want, use services from multiple providers, and mix their learning with other activities in a more natural manner.

关键词： Least Squares Approximations Mashups Electronic Learning Context Awareness Learning Systems Software Metrics Service Oriented Architecture Open Service Oriented Platforms Learning Platforms Personal Learning Environments

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Semi-virtual Plant for the Modelling, control and Supervision of batch-processes. An example of a greenhouse irrigation system

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IFAC-PapersOnLine 2015年第29期48卷 123-128页

作者： Rodríguez, F. Castilla, M. Sánchez, J.A. Pawlowski, A. Department of Computer Science Automatic Control Robotics and Mechatronics Research Group University of Almería Agrifood Campus of International Excellence CeiA3 Spain Department of Computer Science and Automatic Control ETSII UNED Madrid Spain

In this work, a hardware-software architecture for control engineering education is proposed and a case of study regarding a greenhouse irrigation virtual process has been implemented. This specific process is especially useful for subjects related to industrial automation, since it is characterized by mixed dynamics (continuous/discrete) and can be controlled by a Programmable Logic controller (PLC). In such a case, there is no need to access to the real process that is not always available for practical exercises. Moreover, the developed scheme eliminates the maintenance costs related to real process, being a very important advantage for academic institutions. The developed architecture for the industrial process simulation uses Labview, OPC, MODBUS, SolidWorks and Schneider Modicon M340 PLC for the control of virtual processes. The developed example is applied to the greenhouse fertirrigation control that enables the agricultural engineering students to design the irrigation control system. The control strategy is implemented on the PLC which interacts with the virtual process by carrying out the necessary actions in order to control the appropriate variables of the process. © 2015, IFAC (International Federation of automatic control) Hosting by Elsevier Ltd. All rights reserved.

关键词： Process control Batch data processing Engineering education Greenhouses Irrigation Academic institutions control strategies Industrial automation Industrial process simulation Irrigation controls Irrigation systems Programmable Logic controller (PLC) Virtual plants

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Order reduction of transfer functions in practical control systems 9

Order reduction of transfer functions in practical control s...

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9th International Conference on Electrical and control Technologies, ECT 2014

作者： Alcubilla, Javier Joglar Almansa, Joaquín Aranda Automatic Control and Computer Science Department UNED Madrid Spain

ISBN: (纸本)9781634398039

In the design of control systems and, in particular on aircrafts, you often need to work with mathematical models of high order. There are control methodologies that allow you to do it, as Quantitative Feedback Theory (QFT), although they give rise to compensators (controller and prefilters) with order also high. The real problems in implementation of such controllers are obvious, even in some occasions unworkable. We can consider two solutions: Trying to reduce the order of the original plant to get low order controllers;or reducing the controllers which are the high order solution, we have obtained from the original plant. © Kaunas University of Technology, 2014.

关键词： Transfer functions

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Vehicle type recognition based on audio data 58

Vehicle type recognition based on audio data

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58th Hawaii International Conference on System sciences, HICSS 2025

作者： Kobiela, Dariusz Hajdasz, Michał Erezman, Mateusz Nurzyńska, Karolina Zaporowski, Szymon Kurowski, Adam Weichbroth, Paweł Department of Software Engineering Faculty of Electronics Telecommunication and Informatics Gdańsk University of Technology Gabriela Narutowicza 11/12 Gdańsk 80-233 Poland Department of Multimedia Systems Faculty of Electronics Telecommunication and Informatics Gdańsk University of Technology Gabriela Narutowicza 11/12 Gdańsk 80-233 Poland Department of Algorithmics and Software Faculty of Automatic Control Electronics and Computer Science Silesian University of Technology Akademicka 16 Gliwice 44-100 Poland

ISBN: (纸本)9780998133188

Identifying different vehicle types can help manage traffic more efficiently, reduce congestion, and improve public safety. This study aims to create a classification model that can recognize vehicle types based on the sound of passing vehicles. To achieve this, a database of raw audio files containing 1763 samples from two sources was assembled. The time-domain signals were converted to a time-frequency representation using the short-time Fourier transform to generate Mel Spectrograms. Mel-frequency Cepstral Coefficients (MFCCs) were also generated using the discrete cosine transform. In our experiments we compared these approaches. Since the data was imbalanced we applied online augmentation. Based on the literature review, we chose a Convolutional Neural Network (CNN) classifier because it is particularly well suited for analyzing large datasets due to its automatic feature extraction, parameter sharing and sparsity. The results showed that Mel Spectrograms were more effective for audio data preprocessing in this particular use case, achieving the highest accuracy of 0.875 and the highest f1-score of 0.877 compared to MFCCs. © 2025 IEEE computer Society. All rights reserved.

关键词： acoustics mel-frequency cepstral coefficient mfcc sound spectrogram vehicle type detection vehicle type recognition

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Simulation benchmark for autonomous marine vehicles in LabView

Simulation benchmark for autonomous marine vehicles in LabVi...

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IEEE-Spain OCEANS

作者： Astorga, Alejandro Moreno Moreno-Salinas, David García, Dictino Chaos Almansa, Joaquin Aranda Department of Computer Science and Automatic Control UNED University Madrid Spain

ISBN: (纸本)9781457700866

The use of autonomous vehicles is becoming ubiquitous due to the versatility and flexibility that they display in the execution of individual and cooperative tasks, coupled with the fact that their use avoids placing human lives at risk. Closely related to these autonomous systems and their control are the simulation tools. A poor control design could have dramatic consequences to the vehicle itself, the rest of vehicles and even the environment in a real scenario. Thus, these tools are essential to test the correct design and behaviour of the modelling and control algorithms theoretically. In this work a benchmark for unmanned vehicles is presented. The main objective is to have a generic framework in which to develop and test control algorithms for coordinated and cooperative tasks between different kinds of vehicles. The tool is constructed in a modular way, so as any kind of vehicle can be simulated (or tested) with a slight modification of the program. The benchmark can run continuous and discrete (DEVS and non-DEVS) simulations and it is constructed over LabVIEW as Hardware-In-The-Loop (HIL) simulation platform. The use of the same system for simulation and real experiments reduces the cost of hardware tests and facilitates enormously the portability of the theoretical design to the real world. This tool is oriented both for researchers and students, to test their own control algorithms both theoretically and experimentally. © 2011 IEEE.

关键词： Software testing

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Observer-based finite-time control of conformable Takagi–Sugeno fuzzy systems with time delay

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Asian Journal of control 2025年

作者： Kahouli, Omar Gassara, Hamdi Aloui, Ali Elleuch, Zied Bouteraa, Yassine Department of Electronics Engineering Community College University of Ha'il Ha'il Saudi Arabia Laboratory of Science and Technology of Automatic Control and Computer Engineering National School of Engineering of Sfax University of Sfax Sfax Tunisia Department of Computer Science Community College University of Ha'il Ha'il Saudi Arabia Department of Computer Engineering College of Computer Engineering and Sciences Prince Sattam Bin Abdulaziz University Al-Kharj Saudi Arabia

This paper examines finite-time (F-T) observer-based control of fractional-order nonlinear systems with time delay, employing the Takagi–Sugeno fuzzy (T-SF) approach. This study utilizes the conformable fractional derivative (CFD) as its foundational framework. Sufficient conditions are formulated to guarantee that the augmented vector, consisting of the state estimates and the state estimation errors, stays within a ball centered at the origin. This applies not only to specified initial conditions but also to predefined disturbances. These conditions are then reformulated as linear matrix inequalities (LMIs) conditions, which can be efficiently solved using the LMI toolbox. An illustrative example is given to illustrate the proposed result. © 2025 Chinese automatic control Society and John Wiley & Sons Australia, Ltd.

关键词： Delay-sensitive applications

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