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SSRN 2024年

作者： Ni, Chuantao Lang, Ziqiang Wang, Bing Li, Ang Cao, Chenxi Du, Wenli Qian, Feng Key Laboratory of Smart Manufacturing in Energy Chemical Process Ministry of Education East China University of Science and Technology Shanghai200237 China Department of Automatic Control and System Engineering University of Sheffield SheffieldS1 3JD United Kingdom

Source term estimation (STE) of hazardous gas leakages in chemical industrial parks (CIPs) is important for addressing environmental pollution and improving engineering safety and reliability. For this purpose, some least squares-based STE methods have recently been developed, which performs the real-time STE using an off-line determined response matrix that represents the relationship between the sensor measurements and strengths of hazardous gas leakages. However, these methods require the number and locations of potential hazardous gas leakage sources are known a priori, which is difficult in many practical applications. To resolve this issue, in the present study, a novel multi-sensor data-driven STE (MSDD-STE) approach is proposed, which overcomes the difficulties with existing least squares-based STE methods and can, for the first time, address the MSDD-STE problems in complicated scenarios where meteorological conditions such as wind directions change over a considerable range. A detailed analysis is introduced to evaluate the performance of the proposed approach. The effectiveness of the proposed approach is verified by comprehensive numerical simulation studies. © 2024, The Authors. All rights reserved.

关键词： Least squares approximations

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An Approach to Distributed Robust Model Predictive control of Discrete-Time Polytopic systems

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IFAC Proceedings Volumes 2014年第3期47卷 2576-2581页

作者： Alexandra Grancharova Sorin Olaru Institute of System Engineering and Robotics Bulgarian Academy of Sciences Acad. G. Bonchev str. Bl.2 P.O.Box 79 Sofia 1113 Bulgaria (Tel: +*** E3S (SUPELEC Systems Science) Automatic Control Department and EPI INRIA DISCO Gif-sur-Yvette France

A suboptimal approach to distributed robust MPC for uncertain systems consisting of polytopic subsystems with coupled dynamics subject to both state and input constraints is proposed. The approach applies the dynamic dual decomposition method and reformulates the original centralized robust MPC problem into a distributed robust MPC problem. It is based on distributed on-line optimization by applying an accelerated gradient method. The suggested approach is illustrated on a simulation example of an uncertain system consisting of two interconnected polytopic subsystems.

关键词： Predictive control Distributed control Decomposition methods Interconnected systems Uncertainty Robust control Constraints

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Adaptive control for Stabilizing Possibly Inversely Unstable Continuous-time Plants by Using Multirate Input and Fractional-order Holds

Adaptive Control for Stabilizing Possibly Inversely Unstable...

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American control Conference

作者： S. Alonso-Quesada M. De la Sen A. Ibeas Department of Electricity and Electronics University of Basque Country (UPV-EHU) Leioa Spain Institute of Processes Research and Development University of Basque Country (UPV-EHU) Leioa Spain System Engineering and Automatic control Group ETSE. Universidad Autónoma de Barcelona Bellaterra Spain

This paper presents an adaptive control strategy for stabilizing a potentially non-inversely stable, linear and time-invariant plant. Such a strategy consists of a discretization of the plant by means of a fractional-order hold (FROH) with a multirate input in order to place the zeros of the discretized plant into the stability region. In this way, an adaptive controller can be designed so that the discretized plant asymptotically matches a stable reference model without any linking between the reference model zeros and those of the discretized plant Such a controller ensures the matching of the reference model at sampling instants and the boundedness of the plant output for all time. An example is presented to illustrate this control strategy.

关键词： Adaptive control Stability Programmable control Sampling methods controllability automatic control Joining processes Helium State feedback Context modeling

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Study of photophysical properties of Cdq2 thin film

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Materials Today: Proceedings 2022年 66卷 202-204页

作者： Lougdali, M. El Kouari, Y. Anoua, R. Zazoui, M. El Oudghiri-Idrissi, I. Abboud, Y. Zawadzka, A. Sahraoui, B. Laboratory of Materials Energy and Control System Faculty of Sciences and Technology Hassan II University of Casablanca Mohammedia B.P 146 Morocco Department of Automatic and Measurement Faculty of Physics Astronomy and Informatics Nicolaus Copernicus University Torun Poland Laboratory of Engineering Sciences for Energy National School of Applied Sciences of El Jadida El Jadida BP 1166 Morocco Faculty of Sciences Ben M'sik University of Hassan II of Casablanca Casablanca Morocco Centre for Modern Interdisciplinary Technologies Nicolaus Copernicus University Wilenska 4 Torun 87-100 Poland MOLTECH-Anjou UMR 6200 CNRS UNIV Angers 2 bd Lavoisier Angers 49045 France

In this work, the morphological and optical properties of the cadmium (II) bis(8-hydroxyquinoline) (Cdq2) thin film are presented. The film was elaborated by physical deposition technique. The Atomic Force Microscopy (AFM) image shows a homogenous surface. The transmittance was measured in the range of 300–1200 nm with UV–visible spectroscopy. The emission of the film was characterized via the photoluminescence spectroscopy, a strong luminescence has been found. The measurements done at low temperatures show a decrease of the intensity of luminescence in the temperature range of 77–300 K. © 2022

关键词： Thin films

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New features of Easy Java Simulations for 3D Modeling

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IFAC Proceedings Volumes 2010年第24期42卷 250-255页

作者： Carlos A. Jara Francisco Esquembre Francisco A. Candelas Fernando Torres Sebastián Dormido Department of Physics System Engineering and Signal Theory University of Alicante Alicante Spain (e-mail:{carlos.jara francisco.candelas fernando.torres}@ua.es) Department of Mathematics University of Murcia Murcia Spain (e-mail: fem@um.es) Department of Computer Science and Automatic Control UNED University Madrid Spain (e-mail: sdormido@dia.uned.es)

This paper presents a new interface framework which has been added to Easy Java Simualtions' environment in order to improve its graphical features for 3D modeling. These new 3D capabilities provide users a set of new view elements which can be used to develop models with a high degree of reality. In this way, Easy Java Simulations becomes a powerful tool to easily and quickly create 3D realistic simulations.

关键词： computer simulation modeling programming environment software tool virtual reality

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Constrained optimal control of monotone systems with applications to battery fast-charging

arXiv

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arXiv 2023年

作者： Drummond, Ross Courtier, Nicola E. Howey, David A. Couto, Luis D. Guiver, Chris The Department of Automatic Control and Systems Engineering University of Sheffield Mappin St SheffieldS1 3JD United Kingdom The Department of Engineering Science University of Oxford 17 Parks Road OxfordOX1 3PJ United Kingdom The Department of Control Engineering and System Analysis Université libre de Bruxelles BrusselsB-1050 Belgium The School of Engineering & the Built Environment Edinburgh Napier University EdinburghEH10 5DT United Kingdom

Enabling fast charging for lithium ion batteries is critical to accelerating the green energy transition. As such, there has been significant interest in tailored fast-charging protocols computed from the solutions of constrained optimal control problems. Here, we derive necessity conditions for a fast charging protocol based upon monotone control systems theory. Copyright © 2023, The Authors. All rights reserved.

关键词： Optimal control systems

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Quick unsupervised hyperspectral dimensionality reduction for earth observation: A comparison

arXiv

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arXiv 2024年

作者： Lupu, Daniela Garrett, Joseph L. Johansen, Tor Arne Orlandic, Milica Necoara, Ion Automatic Control and System Engineering Department National University of Science and Technology Politehnica Bucharest Bucharest060042 Romania Center for Autonomous Marine Operations and Systems Norwegian University of Science and Technology Trondheim Norway Department of Engineering Cybernetics Norway Department of Electronic Systems Norway G. Mihoc-C. Iacob Institute of Mathematical Statistics and Applied Mathematics The Romanian Academy Bucharest050711 Romania

Dimensionality reduction can be applied to hyperspectral images so that the most useful data can be extracted and processed more quickly. This is critical in any situation in which data volume exceeds the capacity of the computational resources, particularly in the case of remote sensing platforms (e.g., drones, satellites), but also in the case of multi-year datasets. Moreover, the computational strategies of unsupervised dimensionality reduction often provide the basis for more complicated supervised techniques. Seven unsupervised dimensionality reduction algorithms are tested on hyperspectral data from the HYPSO-1 earth observation satellite. Each particular algorithm is chosen to be representative of a broader collection. The experiments probe the computational complexity, reconstruction accuracy, signal clarity, sensitivity to artifacts, and effects on target detection and classification of the different algorithms. No algorithm consistently outperformed the others across all tests, but some general trends regarding the characteristics of the algorithms did emerge. With half a million pixels, computational time requirements of the methods varied by 5 orders of magnitude, and the reconstruction error varied by about 3 orders of magnitude. A relationship between mutual information and artifact susceptibility was suggested by the tests. The relative performance of the algorithms differed significantly between the target detection and classification tests. Overall, these experiments both show the power of dimensionality reduction and give guidance regarding how to evaluate a technique prior to incorporating it into a processing pipeline. © 2024, CC BY.

关键词： Remote sensing

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Can random proximal coordinate descent be accelerated on nonseparable convex composite minimization problems?

Can random proximal coordinate descent be accelerated on non...

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European control Conference (ECC)

作者： Flavia Chorobura François Glineur Ion Necoara Automatic Control and System Engineering Department Spl. Independentei University Politehnica Bucharest Bucharest Romania ICTEAM Institute and CORE Université catholique de Louvain Louvain-la-Neuve Belgium Gheorghe Mihoc-Caius Iacob Institute of Mathematical Statistics and Applied Mathematics of the Romanian Academy Bucharest Romania

In this paper we consider convex composite optimization problems, where first term is smooth, while the second term is proximal easy but nonseparable (possibly non-smooth). For this problem we adapt the accelerated proximal coordinate descent algorithm from [7], initially developed for convex composite problems having the second term separable. We study convergence to a coordinate-wise minimizer point, and derive convergence rate in expected function values of order $\mathcal{O}((\mathrm{C}+(\mathbb{E}[S_{k}^{\#}])_{+})/k^{2})$. The first term, C, coincides with the usual constant appearing in the rate of accelerated gradient type methods, while the second one, $S_{k}^{\#}$, measures the nonseparability of the second term in the objective along the iterates. We conjecture that the second term, $S_{k}^{\#}$, is bounded as this is what we observe in all our numerical simulations and that coordinate descent can be accelerated.

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Tutorial: control issues in haptic teleoperation

Tutorial: Control issues in haptic teleoperation

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World Haptics Conference

作者： Angelika Peer Cristian Secchi Katsunari Sato Cenk Cavusoglu Institute of Automatic Control Engineering (LSR) Technische Universität München Munchen Germany DISMI University of Modena and Reggio Emilia and INFM Reggio Emilia Italy Graduate School of System Design and Management Keio University Yokohama Kanagawa Japan Department of Electrical Engineering and Computer Sciences Case Western Reserve University Cleveland OH USA

Telerobotics is one of the most traditional fields of robotics and it played a crucial role in the history of robotics and of the mankind, especially in the areas of space and undersea exploration and of remote material handling. On the other hand, teleoperation is still a very active research area and many problems are still open. In particular, the design of the control strategy for coupling local and remote site is of paramount importance for implementing telepresence, namely the feeling of being directly interacting with the remote environment. The IEEE RAS Technical Committee on Telerobotics would like to propose a half-day tutorial for illustrating several successful control strategies for implementing high performance bilateral teleoperation systems.

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The Displacement of Quatrupedal Walking Robots

The Displacement of Quatrupedal Walking Robots

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第十一届IFTOMM世界大会

作者： Ion Ion Ion Simionescu Adrian Curaj Technology of Machine Manufacturing Dept.POLITEHNICA University Splaiul Independentei no. 313 Bucharest Romania Mechanism and Robot Theory Dept POLITEHNICA University Splaiul Independentei no. 313 Bucharest Romania Automatic Control and System Engineering Department POLITEHNICA University Splaiul Independentei no. 313 Bucharest Romania

The main characteristic of the walking robots is that they are able to move away on not arranged, horizontal and rough terrain. The movement of the walking robots can be divided in two modes: - under condition of the static stability, - under condition of the dynamic stability. The loss of static or quasi-static stability may be produced in two cases, namely: - the vertical projection of the gravity center is out of support polygon, - one or more tangential components of reaction forces from support points are greater than the friction forces. The movement of the walking robot under dynamical stability conditions may be realized when the forward average speed is greater than a certain limit. In the work are analyzed the possibilities of determination of the limit conditions for the stable displacement of the quadrupedal walking robots.

关键词： Walking robot, Force distribution in walking robot structure, Stability of walking robot

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