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23rd International Conference on control systems and Computer Science Technologies, CSCS 2021

作者： Radulescu, Iulia Stefanoiu, Dan University Politehnica of Bucharest Department of Automatic Control and System Engineering Bucharest Romania

ISBN: (纸本)9781665439398

The objective of this paper is trajectory tracking for an aerial vehicle in presence of wind disturbances. The approach first involves linearizing the non-linear model of the aerial vehicle around operating points chosen along the trajectory to be followed. Then, a proposed modified version of robust min-max model predictive control is employed by using only one linearized model along the prediction horizon. The trajectory is generated using the concept of differential flatness. The simulation results of the proposed approach show that the aerial vehicle effectively manages to follow the trajectory under wind disturbances. © 2021 IEEE.

关键词： Trajectories

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Advanced concepts in Power control systems

Advanced concepts in Power Control Systems

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作者： Dumitrache, Ioan Iliescu, Sergiu Stelian Automatic Control and System Engineering Department Faculty Automatic of Control and Computers Politehnica University Bucharest Romania Automatic Control and Industrial Informatics Departament Faculty Automatic of Control and Computers Politehnica University Bucharest Romania

ISBN: (纸本)9783902661388

In this paper are presented some new concepts of control applied in Power systems. Are given the architectures and methodologies based on the agents theory. The complexity of Power systems is included into a new paradigm - Complex Adaptive systems - and the modelling and control of Power systems based on intelligent agents are considered. Some concepts on hierarchical and heterarchical architectures which include different intelligent techniques are also presented in this paper.

关键词： Multi agent systems

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Hierarchical control with Guaranteed Fault Diagnosability

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IFAC-PapersOnLine 2018年第24期51卷 1105-1110页

作者： Stoican, Florin Petzke, Felix Prodan, Ionela Streif, Stefan University POLITEHNICA of Bucharest Automatic Control and Systems Engineering Department 313 Splaiul Independentei Bucharest Romania Technische Universität Chemnitz Automatic Control and System Dynamics Lab Chemnitz09107 Germany GrenobleINP France

A multiple time-scale hierarchical control approach with guarantees for active fault diagnosability (detection and isolation) is presented. Robust positive invariance notions are used to provide a set-membership test for FDI validation at the low level and sufficient constraints for guaranteeing FDI at the high level. Due to the computational burden of the involved bilinear optimization problem, the high-level reference governor operates at a slower sampling time than the controller of the low-level system. Therefore, corner cutting avoidance constraints are imposed such that the faster-sampled lower level is still guaranteed to function properly. A case study illustrates the presented theoretical notions. © 2018

关键词： Fault detection Edge detection Bilinear optimizations Computational burden Corner cutting Fault diagnosability Hierarchical control isolation Positive invariance Reference governors

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Integrating Blockchain Technology in a Cyber Physical system to Secure Data 24

Integrating Blockchain Technology in a Cyber Physical System...

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24th International Conference on control systems and Computer Science, CSCS 2023

作者： Beatrix-May, Balaban Stefan, Sacala Ioan Alina-Claudia, Petrescu-Nita Razvan, Nita Politehnica University of Bucharest Faculty of Automatic Control and Computers Department of System Engineering Romania

ISBN: (纸本)9798350313390

Considering the constant growth and evolution of technology, being able to secure data is a challenge. This is why researchers find this a top research topic. Cyber-Physical systems are complex, large-scale systems that can be found in domains like healthcare, transportation, industrial controls systems or smart grids. Having many components that interact with each other, we can observe here the challenge in maintaining a secure environment for the data as data tampering or data extraction can occur, for example, in the actual transportation of data from one device to another. The main focus of this paper is to give an answer if blockchain technology provides a solution in building a secure network. We give a short review of the related work regarding blockchain integration in large-scale systems like Cyber-Physical systems. It was also briefly analyzed the layered structure of a blockchain and discussed some solutions for each layer. We then discussed about consensus algorithms for validation and authentication process. In general, consensus algorithms are implemented to assure the validation process of the nodes in a network. In this paper we tried to analyze and propose a model that offers an extra layer of security by adding the authentication step. In this way, the nodes that are validated are also considered trusted nodes in the network. © 2023 IEEE.

关键词： Blockchain

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Robust Event-Triggered MPC for Constrained Linear Discrete-Time systems with Guaranteed Average Sampling Rate

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IFAC-PapersOnLine 2015年第23期48卷 117-122页

作者： Brunner, Florian D. Heemels, W.P.M.H. Allgöwer, Frank Institute for Systems Theory and Automatic Control University of Stuttgart Pfaffenwaldring 9 Stuttgart70569 Germany Control System Technology Group Department of Mechanical Engineering Eindhoven University of Technology Netherlands

We propose a robust event-triggered model predictive control (MPC) scheme for linear time-invariant discrete-time systems subject to bounded additive stochastic disturbances and hard constraints on the input and state. For given probability distributions of the disturbances acting on the system, we design event conditions such that the average frequency of communication between the controller and the actuator in the closed-loop system attains a given value. We employ Tube MPC methods to guarantee robust constraint satisfaction and a robust asymptotic bound on the system state. Moreover, we show that based on a given periodically updated Tube MPC scheme, an appropriate event-triggered MPC scheme can be designed, with the same guarantees on constraints and region of attraction, but with a reduced number of average communications. © 2015, IFAC (International Federation of automatic control) Hosting by Elsevier Ltd. All rights reserved.

关键词： Discrete time control systems Closed loop systems Digital control systems Linear control systems Model predictive control Predictive control systems Probability distributions Robustness (control systems) Stochastic models Stochastic systems Constraint Satisfaction Discrete time systems Event triggered controls Linear discrete time systems Linear time invariant Predictive control Region of attraction Stochastic disturbances

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Numerical Evaluation of a Robust Self-Triggered MPC Algorithm

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IFAC-PapersOnLine 2016年第22期49卷 151-156页

We present numerical examples demonstrating the efficacy of a recently proposed self-triggered model predictive control scheme for disturbed linear discrete-time systems with hard constraints on the input and state. In order to reduce the amount of communication between the controller and the actuator, the control input is not re-computed at each point in time but only at certain sampling instances. These instances are determined in a self-triggered fashion in the sense that at every sampling instant the next sampling instant is computed as a function of the current system state. A compact set in the state space, whose size is a design parameter in the control scheme, is stabilized. © 2016

关键词： Discrete time control systems Digital control systems Model predictive control Predictive control systems Robustness (control systems) control inputs control schemes Design parameters Hard constraints Linear discrete time systems Predictive control Sampling instants Self triggered controls

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A microgrid library in a general simulation language 19

A microgrid library in a general simulation language

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19th IFAC World Congress on International Federation of automatic control, IFAC 2014

作者： Salazar, J. Tadeo, F. De Prada, C. Department of System Engineering and Automatic Control School of Industrial Engineering University of Valladolid Valladolid47011 Spain

ISBN: (纸本)9783902823625

A library in the EcosimPro environment, developed with the objective of providing the tools needed to integrate MicroGrids into multi-domain simulations is presented. Thus, practical simulated components of renewable energy sources (photovoltaic arrays, wind turbines), diesel generators, power electronic interfaces (DC/AC or AC/DC/AC), energy storage devices (batteries) are developed, in order to integrate them with the existing libraries of loads (such as electrical systems, hydraulic systems, chemical engineering process, etc). Components in the library are designed so they can be parametrized from data sheet information by general engineers, and then graphically connected to simulate under variable conditions specific real-life Microgrids. With this, different configurations and control strategies for Microgrids can be tested when operating on the real process. After presenting the main ideas behind the dynamic modelling of the components, the application to a case study is presented. © IFAC.

关键词： Digital libraries

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Artificial Intelligence Embedded Object-Oriented Methodology For Model Based Decision Support

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Journal of systems engineering and Electronics 1996年第1期7卷 1-14页

作者： Feng Shan Tian Yuan Li Tong & Cai Jun (Institute of system engineering, department of automatic control engineering Huazhong University of Science and Technology, Wuhan, Hubei, 430074, P. R. China) Institute of System Engineering Department of Automatic Control Engineering Huazhong University of Science and Technology Wuhan Hubei 430074 P. R. China

The paper presents the coupling of artificial intelligence-AI and Object-oriented methodology applied for the construction of the model-based decision support system *** MBDSS is designed for support the strategic decision making lead to the achievemellt of optimal path towardsmarket economy from the central planning situation in China. To meet user's various requirements,a series of innovations in software development have been carried out, such as system formalization with OBFRAMEs in an object-oriented paradigm for problem solving automation and techniques of modules intelligent cooperation, hybrid system of reasoning, connectionist framework utilization,etc. Integration technology has been highly emphasized and discussed in this article and an outlook to future software engineering is given in the conclusion section.

关键词： Artificial intelligence Object-oriented methodology Knowledge-based systems Intelligently cooperative systems Neural nets Case hased reasoning Behavioral science,Advancedautomation.

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Discrete Simulation of Flexible Plate Structure Using State-Space Formulation

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系统仿真学报 2008年第19期20卷 5141-5146页

作者： S. Md. Salleh M. O. Tokhi Department of Automatic Control and System Engineering The University of Sheffield Sheffield S3 1JD U. Kingdom Faeulty of Mechanical and Manufacturing Engineering University of Tun Hussein Onn Malaysia 86400 Johor Malaysia

This paper presents the development of dynamic simulation of a flexible plate structure with various boundary conditions. A flexible square plate is considered. A finite-difference method is used to discretise the governing partial differential equation formulation describing its dynamic behaviour. The model thus developed has been validated against characteristic parameters of the plate. The model thus developed is further formulated using discrete state-space representation, to allow easy and fast implementation for simulating the dynamic behaviour of the plate with various boundary conditions. The simulation algorithm thus developed is validated, and accurate results with representation of the first five modes of vibration of the plate have been achieved. The algorithm thus developed is used in subsequent research work as a platform for development and verification of suitable control strategies for vibration suppression of flexible plate structures.

关键词：复杂系统模拟技术平面结构分析方法系统结构

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Time-varying sliding mode control for a class of uncertain MIMO nonlinear system subject to control input constraint

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Science China(Information Sciences) 2010年第1期53卷 89-100页

作者： JIN YongQiang1,2, LIU XiangDong1, QIU Wei2 & HOU ChaoZhen1 1department of automatic control, Beijing Institute of Technology, Beijing 100081, China 2Aerospace system engineering Shanghai, Shanghai 201108, China 1. Department of Automatic Control Beijing Institute of Technology Beijing 100081 China2. Aerospace System Engineering Shanghai Shanghai 201108 China

To solve the regulator problem of a class of uncertain MIMO nonlinear systems subject to control input constraint, three types of time-varying sliding mode control laws are proposed. The sliding surfaces pass the initial value of the system at the initial time, and are shifted/rotated towards the predetermined ones. The controller parameters are optimized by genetic algorithm (GA). Lyapunov method is adopted to prove the stability and robustness to the parameter uncertainties and external disturbance. By mean of time-varying sliding mode control law, the reaching phase in the conventional sliding mode control is eliminated, and the system is guaranteed to have robustness from the very beginning. Taking the control of two-link manipulator and attitude tracking of rigid spacecraft as two examples, we illustrate the features of the time-varying sliding mode control. The simulation results show the validity of the control law to a class of uncertain MIMO systems. Better robustness against the uncertainties and external disturbance could be achieved by time-varying sliding mode control without violating the constraint on control input.

关键词： time-varying sliding surface sliding mode control MIMO nonlinear system uncertain control input constraints

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