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作者： Keviczky, L. Bányász, Cs. Institute of Computer Science and Automation MTA-BME Control Engineering Research Group Hungarian Academy of Sciences H-1111 Budapest Kende u 13-17 Hungary

A PID regulator tuning method is introduced for HAMMERSTEIN and WIENER type block-oriented cascade factorable nonlinear models. Then the YOULA-parameterization approach is discussed which allows to develop an observer... 详细信息

关键词： Proportional control systems

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Plug & Test at system level via testable TLM primitives

Plug & Test at system level via testable TLM primitives

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International Test Conference 2008, ITC 2008

作者： Alemzadeh, Homa Carlo, Stefano Di Refan, Fatemeh Prinetto, Paolo Navabil, Zainalabedin CAD Research Group ECE Department University of Tehran Tehran 14399 Iran Control and Computer Engineering Department Politecnico di Torino I-10129 Torino Italy

ISBN: (纸本)9781424424030

With the evolution ofElectronic System Level (ESL) design methodologies, we are experiencing an extensive use of Transaction-Level Modeling (TLM). TLM is a high-level approach to modeling digital systems where details of the communication among modules are s eparated from the those of the implementation offunctional units. This paper represents a first step toward the automatic insertion of testing capabilities at the transaction level by definition of testable TLM primitives. The use of testable TLM primitives should help designers to easily get testable transaction level descriptions implementing what we call a "Plug & Test" design methodology. The proposed approach is intended to work both with hardware and software implementations. In particular, in this paper we willfocus on the design of a testable FIFO communication channel to show how designers are given the freedom of trading-off complexity, testability levels, and cost. C2008 IEEE.

关键词： Design for testability

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Stable ℋ∞ controller design based on a novel parameterization of the controller set

Stable ℋ∞ controller design based on a novel parameterizat...

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European control Conference (ECC)

作者： T. Péni Z. Szabó J. Bokor Institute for Computer Science and Control MTA-BME Control Engineering Research Group

This paper proposes a method for improving the LMI-based robust control synthesis. It is well-known that the design of a ℋ ∞ controller can be formulated as a two-step procedure. In the first step the performance level is minimized and the closed loop Lyapunov function is determined. The second step is the construction of the controller. The currently available implementations of this procedure generate only one controller candidate and leave no room for additional tuning between the design steps. If the controller obtained is not acceptable, (e.g. it is unstable) then the designer has to modify the original control problem (changing, e.g., the performance weighting functions) and then has to perform the entire synthesis again. This paper presents a novel parameterization of all controllers corresponding to the performance level and Lyapunov function determined in the first design step. This parameterizaton makes it possible to construct tuning algorithms for finding the “best” controller in the parameterized set. Now, this paper focuses only on the stability of the controller and provides an iterative tuning algorithm, which finds a stable controller having poles on the prescribed domain of the left half complex plane. The applicability of the proposed algorithm is demonstrated on a simple robust control problem.

关键词： Linear matrix inequalities Tuning Symmetric matrices Optimization Algorithm design and analysis Eigenvalues and eigenfunctions Output feedback

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Recent advances in heterogeneous catalysis of solar-driven carbon dioxide conversion

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Journal of Environmental Sciences 2024年第6期140卷 165-182页

作者： Jun Xu Farzaneh Arabpour Roghabadi Ying Luo Vahid Ahmadi Qian Wang Zheng Wang Hong He State Key Joint Laboratory of Environment Simulation and Pollution Control Research Center for Eco-Environmental SciencesChinese Academy of SciencesBeijing 100085China College of Chemistry and Chemical Engineering Henan Polytechnic UniversityJiaozuoHenan 454000China Department of Process Engineering Faculty of Chemical EngineeringTarbiat Modares UniversityTehranIran Optoelectronics and Nanophotonics Research Group Faculty of Electrical and Computer EngineeringTarbiat Modares UniversityTehranIran Graduate School of Engineering Nagoya UniversityFuro-choChikusa-kuNagoya 464-8603Japan

Solar-driven carbon dioxide(CO_(2))conversion including photocatalytic(PC),photoelectrochemical(PEC),photovoltaic plus electrochemical(PV/EC)systems,offers a renewable and scalable way to produce fuels and high-value chemicals for environment and energy *** review summarizes the basic fundament and the recent advances in the field of solar-driven CO_(2)*** the visible-light absorption is an important strategy to improve solar energy conversion *** separation and migration of photogenerated charges carriers to surface sites and the surface catalytic processes also determine the photocatalytic *** engineering including co-catalyst loading,defect engineering,morphology control,surface modification,surface phase junction,and Z-scheme photocatalytic system construction,have become fundamental strategies to obtain high-efficiency *** to photocatalysis,these strategies have been applied to improve the conversion efficiency and Faradaic efficiency of typical PEC *** PV/EC systems,the electrode surface structure and morphology,electrolyte effects,and mass transport conditions affect the activity and selectivity of electrochemical CO_(2)***,the challenges and prospects are addressed for the development of solar-driven CO_(2)conversion system with high energy conversion efficiency,high product selectivity and stability.

关键词： Solar-driven CO_(2)reduction Photocatalytic system Photoelectrochemical system Photovoltaic plus electrochemical system Surface/interface engineering

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On the generation of LFT-based uncertainty models for flight control law robustness analysis

On the generation of LFT-based uncertainty models for flight...

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AIAA Guidance, Navigation, and control Conference and Exhibit 2001

作者： Kureemun, Ridwan Bates, Declan G. Hayes, Martin J. Control and Instrumentation Research Group Department of Engineering University of Leicester University Road Leicester LEI 7RH United Kingdom Department of Electronic and Computer Engineering University of Limerick Limerick Ireland

ISBN: (纸本)9781563479786

This paper considers the problem of generating Linear Fractional Transformation (LFT) based uncertainty models for the robustness analysis of flight control systems using the structured singular value μ. Two approaches to the problem are described. The first is an 'exact' approach based on physical modelling, which requires detailed information about the way in which the uncertain aircraft parameters enter the aircraft dynamic equations. This approach is compared with an easier and faster method which uses the differences in the linearised trims that arise from a simulation model of the aircraft evaluated at different points over the uncertain parameter space as a basis for LFT construction. Although this method could potentially be quite conservative, we show by an example robustness analysis for the lateral control law of a civil transport aircraft that the proposed 'difference-based' approach yields comparable bounds on μ to those generated via the exact method. This is due partly to the absence of repeated real uncertainty constraints in the LFT's generated via the difference based approach, resulting in a less conservative μ-analysis problem formulation than that generated by the exact LFT representation. Our results indicate that, for many practical aerospace analysis problems, it may be feasible to use simple, easily automated algorithms for LFT-based uncertainty modelling. © 2001 by the authors.

关键词： Flight control systems

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A risk situation estimation method for power information communication network 4

A risk situation estimation method for power information com...

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4th IEEE Conference on Energy Internet and Energy System Integration, EI2 2020

作者： Zhang, Zhicheng Lv, Jin Yu, Lei Peng, Qiwei Shi, Jianghong Li, Gang State Grid Electric Power Research Institut Nari Group Corporation Nanjing China North China Electric Power University School of Control and Computer Engineering Baoding China

ISBN: (纸本)9781728196060

The fusion and interdependence of cyber and physical system has become the main characteristic of power system, which has brought new challenges to the risk assessment of the power information and communication network at the same time. Since the risk situation assessment of power information and communication network is a multilevel and multiple indicators issue with a deep correlation between the indicators, a comprehensive risk situation assessment model is constructed. First, the index system of risk situation assessment is constructed. Second, the model of comprehensive evaluation of risk situation is constructed based on fuzzy measure and choquet fuzzy integral. The subjective weighting calculation method combines with the objective calculation method to determine the fuzzy density of single index, and then calculate fuzzy measure based on the obtained fuzzy density. Employ choquet fuzzy integral operator to integrate comprehensive estimation value of index set. Finally, the maximum membership degree principle is adopted to obtain the comprehensive risk situation. By applying the evaluation method to the simulation analysis of a power communication network, the validity of the proposed method is shown. © 2020 IEEE.

关键词： Risk assessment

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Robust Reconfgurable control for In-wheel Electric Vehicles

Robust Reconfgurable Control for In-wheel Electric Vehicles

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作者： Gaspar, Péter Bokor, József Mihály, András Szabó, Zoltán Fülep, Timea Szauter, Ferenc Institute for Computer Science and Control Hungarian Academy of Sciences and MTA-BME Control Engineering Research Group Budapest Hungary Institute for Computer Science and Control Hungarian Academy of Sciences Budapest Hungary Research Center of Vehicle Industry Széchenyi István University Gyôr Hungary

The paper presents a fault tolerant reconfgurable control method for vehicles driven by four in-wheel electric motors and a steering system. The aim of the design is to realize robust velocity and road trajectory tracking even under challenging driving conditions or actuator failures. The vehicle is operated solely with the in-wheel motors, thus steering intervention is only applied in case of skidding or a failure of an electric motor. The reconfgurable control is realized based on Linear Parameter Varying (LPV) framework, using the specifc characteristics of the in-wheel motors of fast and accurate torque control. The operation of the designed control system is demonstrated in a CarSim simulation environment. © 2015

关键词： Robust control

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Dynamic modeling and model analysis of a large industrial synchronous generator

Dynamic modeling and model analysis of a large industrial sy...

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作者： Fodor, Attila Magyar, Attila Hangos, Katalin M. Department of Electrical Engineering and Information Systems University of Pannonia 8200 Veszprém Hungary Process Control Research Group Computer and Automation Research Institute HAS Budapest Hungary

ISBN: (纸本)9788070438657

A simple dynamic model of an industrial size synchronous generator operating in a nuclear power plant is developed in this paper based on first engineering principles. The constructed state-space model consists of a nonlinear state equation and a bi-linear output equation. It has been shown that the model is locally asymptotically stable with parameters obtained from the literature for a similar generator. The effect of load disturbances on the partially controlled generator has been analyzed by simulation using a traditional PI controller. It has been found that the controlled system is stable and can follow the set-point changes in the effective power well. The disturbance rejection of the controller is also satisfactory.

关键词： Disturbance rejection

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Static performance of hot bonded inserts in honeycomb panels

Static performance of hot bonded inserts in honeycomb panels

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49th AIAA/ASME/ASCE/AHS/ASC Structures, Structural Dynamics, and Materials Conference

作者： Bianchi, G. Aglietti, G.S. Richardson, G. School of Engineering Sciences University of Southampton Southampton SO17 1BJ United Kingdom Surrey Satellite Technology Limited Tycho House Surrey Research Park Guildford GU2 7YE United Kingdom Astronautics Research Group AIAA Mechanical Computer Aided Design Group

An investigation on the structural performance of inserts within honeycomb sandwich panels is presented. The investigation only considers metallic inserts in all aluminum sandwich panels and emphasis is placed on the structural performance difference between hot bonded and cold bonded inserts. The former are introduced during panel manufacture while the latter are potted into existing panels. The investigation only deals with the static performance of the two insert systems subject to loads in the normal direction to the facing plane, which corresponds to their main mode of operation. The experimental part of the work presented involved carrying out pullout tests on hot bonded and cold bonded reference samples by loading them at a centrally located insert. As expected the hot bonded reference samples outperformed the cold bonded reference samples in terms of load carrying capabilities. An analytical model which allows the prediction of shear stress distribution in a circular sandwich panel normally loaded at a centrally located insert is used in an analytical approach for calculating the load carrying capability of inserts. The results from this analytical approach were found to correlate well with the experimental ones for the hot bonded inserts but not for the cold bonded inserts which actually failed at a significantly lower load than was predicted. Copyright © 2008 by the American Institute of Aeronautics and Astronautics, Inc. All rights reserved.

关键词： Honeycomb structures

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Multi-view people detection on arbitrary ground in real-time

Multi-view people detection on arbitrary ground in real-time

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8th International Conference on computer Vision Theory and Applications, VISAPP 2013

作者： Kiss, Ákos Szirányi, Tamás Distributed Events Analysis Research Group Computer and Automation Research Institute Hungarian Academy of Sciences Budapest Hungary Dept. of Control Engineering and Information Technology Budapest University of Technology and Economics Budapest Hungary

ISBN: (纸本)9789898565471

We show a method to detect accurate 3D position of people from multiple views, regardless of the geometry of the ground. In our new method we search for intersections of 3D primitives (cones) to find positions of feet. The cones are computed by back-projecting ellipses covering feet in input images. Instead of computing complex intersection body, we use approximation to speed up intersection computing. We found that feet positions are determined accurately, and the height map of the ground can be reconstructed with small error. We compared our method to other multiview-detectors - using somewhat different test methodology -, and achieved comparable results, with the benefit of handling arbitrary ground. We also present accurately reconstructed height map of non-planar ground. Our algorithm is fast and most of steps are parallelizable, making it possibly available for smart camera systems.

关键词： computer vision

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