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Optimizing Supervision and control for Industrial Furnaces: Predictive control Based Design

IFAC Proceedings Volumes 2004年第19期37卷 17-28页

作者： Georgi M. Dimirovski A. Talha Dinibütün Miomir K. Vukobratovic J. Zhao SS Cyril and Methodius University Faculty of Electrical Engineering MK-1000 Skopje Republic of Macedonia Dogus University Computer Engineering Department Faculty of Engineering Acibadem Zeamet Sk. 21 Kadikoy TR-34722 Istanbul Turkey Institute “Mihailo Pupin” Centre of Robotics and Flexible Automation 11000 Belgrade Serbia and Montenegro Northeastern University School of Information Science and Engineering Institute of Control Theory Shenyang Liaoning 110004 P.R. of China

A systems re-engineering technique to integrated control and supervision for applications to industrial multi-zone furnaces has been elaborated by using known theories on generalized predictive control and nonlinear programming. This paper presents the derivation of optimizing equations and inequalities. The design is based on the use of general predictive control to provide optimized set-points under the presumption a well designed regulatory control was implemented at the executive level. Digital implementation of control functions are sought within standard computer process control platform for practical engineering and maintenance reasons.

关键词： Complex time-delay processes generalized predictive control integrated control and supervision optimization set-point control

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Workspace deformation based teleoperation for the increase of movement precision

Workspace deformation based teleoperation for the increase o...

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IEEE International Conference on robotics and Automation (ICRA)

作者： A. Casals L. Munoz J. Amat Dep. Automatic Control and Computer Engineering Robotics Institute UPC-Universitat Politicnica de Catalunya Spain Robotics Institute. (IRI) UPC / CSIC UPC-Universitat Politècnica de Catalunya Spain

Teleoperation makes possible the execution of many tasks, that otherwise are not feasible when a human operator can not access to the working area due to dangerousness or environmental conditions, and it is not possible as well, to program the task so as to be performed autonomously, due to its complexity. Nevertheless, manipulation tasks require certain ability from the human operator due to the difficulties that produce the need to operate through control devices that does not fit with the structure of the slave arms. With the aim of increasing the precision capabilities provided by such control interfaces, a vision based procedure designed to deform the space around the working point has been developed. The vision system operates from the detection of the relevant scene elements. This space deformation produces automatically a progressive increase in precision when the robot arm approaches the relevant detected elements.

关键词： Robot kinematics Humans Orbital robotics Automatic control Service robots Medical robotics Intelligent robots Arm robotics and automation Force feedback

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Novel approach in the adaptive control of systems having strongly nonlinear coupling between their unmodeled internal degrees of freedom

Novel approach in the adaptive control of systems having str...

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IEEE International Conference on robotics and Automation (ICRA)

作者： I.J. Rudas K. Kozlowski J.K. Tar K. Jezernik John von Neumann Faculty of Informatics Institute of Mathematical and Computational Sciences Budapest Hungary Chair of Control Robotics and Computer Science Poznan University of Technology Poznan Poland Budapest Polytechnic Institute of Mathematical and Computational Sciences Budapest Faculty of Electrical Eng. and Computer Science Institute of Robotics University of Maribor Slovenia

The application of a novel branch of computational cybernetics is extended to the adaptive control of very inaccurately and partly modeled electromechanical systems also having unmodeled non-linear dynamic coupling with their environment. The method uses "uniform structures" for modeling, and "uniform procedures" for "repetitive" or cumulative learning like in the case of the "traditional" soft computing approaches. But it considerably reduces the number of free parameters tuning with simple, lucid, and explicit algebraic operations of limited number of steps. It is demonstrated via simulation that the control can operate even if strongly nonlinear terms (Coulomb friction and sticking combined with the elastic and viscous terms of the unmodeled external interaction in the Stribeck model), and elastically deformable joints are present. As a paradigm a mechanically 3 DOF SCARA arm actuated by voltage-controlled DC motors is considered. The system has 9 degrees of freedom (6 mechanical and 3 electrical). For the controller only three mechanical degrees can efficiently compensate the effect of the unmodeled degrees of freedom, the external interaction, and the inaccuracy of the modeled part of the robot.

关键词： Adaptive control Couplings Deformable models Cybernetics Electromechanical systems Computational modeling Friction Voltage DC motors Robots

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A real-time Java system on a multithreaded Java microcontroller

A real-time Java system on a multithreaded Java microcontrol...

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International Symposium on Object-Oriented Real-Time Distributed Computing

作者： M. Pfeffer S. Uhrig T. Ungerer U. Brinkschulte Institute for Computer Science University of Augsburg Augsburg Germany Institute for Process Control Automation and Robotics University of Karlsruhe Karlsruhe Germany

This paper presents a real-time Java hardware and software system for use in embedded applications. The system includes a multithreaded Java microcontroller, an adapted Java Virtual Machine (JVH) and an extended application programming interface (API). The microcontroller core is designed with a multithreaded pipeline and hardware support for real-time scheduling algorithms. The Java Virtual Machine consists of trap routines for complex Java byte-codes, real-time garbage collection and a class loader for creating real-time data structures. On a higher level, the application programming interface provides easy real-time thread management and access to hardware components like serial interfaces and timer/counter units.

关键词： Java Real time systems Microcontrollers Hardware Application software Virtual machining Software systems Algorithm design and analysis Pipelines Scheduling algorithm

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Selection of the best stereo pair in a multi-camera configuration

Selection of the best stereo pair in a multi-camera configur...

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IEEE International Conference on robotics and Automation (ICRA)

作者： J. Amat M. Frigola A. Casals Robotics Institute IRI UPC-CSIC Barcelona Spain Department of Automatic Control and Computer Engineering Technical University Catalunya Barcelona Spain

The analysis of the error of stereo measurements by triangulation is revisited from three points of view: geometrical, statistical and visual quality. When the target is visible by a set of distributed cameras in the workspace, there are multiple combinations of camera pairs adequate to be considered for the location, by triangulation, of the target position. Three-camera placements are analysed evaluating their precision in a short-medium distance. The work presented analyses which combination of stereo measurements gives the best results, and proposes a method for the automatic selection of the most adequate cameras pair.

关键词： Cameras Robot vision systems Force control Automatic control Stereo vision Calibration Uncertainty Pixel Error analysis robotics and automation

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A neural approach to an attentive navigation for 3D intelligent virtual agents

A neural approach to an attentive navigation for 3D intellig...

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IEEE International Conference on Systems, Man and Cybernetics

作者： M. Lozano J. Molina Artec Group Institute of Robotics. Computer Science Department University of Valencia Valencia Spain Neurotechnology Control and Robotics Group Engineering and Automatic Systems Department Politechnic University of Cartagena Spain

This paper presents an attempt to integrate attention and navigation skills in 3D embodied agents (virtual humanoids). The neural model presented has been divided in two main phases. Firstly the environment-categorization phase, where an online pattern recognition and categorization of the agent current sensory input data is carried out by an adaptive resonance driven self organizing neural network, which will finally simulate the agent's short term memory (STM). Secondly, the model must also learn how and when to map its current STM state into the navigation and attention motor layers of the 3D agent. We also review the world modelling and the agent vision system, and finally we present the first results extracted from two of the subsystems which conforms the complete neural model, such as, the environment categorization subsystem and the base navigation neural model.

关键词： Navigation Intelligent agent Intelligent robots robotics and automation Humans Graphics Virtual environment Machine vision computer science Augmented virtuality

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Augmented reality to assist teleoperation working with reduced visual conditions

Augmented reality to assist teleoperation working with reduc...

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IEEE International Conference on robotics and Automation (ICRA)

作者： A. Casals J. Fernandez J. Amat Dep. Automatic Control and Computer Engineering Universitat Politecnica de Catalunya Barcelona SPAIN Robotics Institute. (lRI) UPC/CSIC Barcelona SPAIN

Teleoperation in harsh environments has to tackle the problem of working with images of poor quality, as the visual feedback means for the human operator. This paper describes a procedure for image augmentation, based on the models of the scene elements, which are built from the images acquired in a previous phase, before the execution of the task, when the visual environment conditions are still good enough.

关键词： Augmented reality Layout Robots TV Optical sensors Optical feedback Automatic control control engineering computing robotics and automation Operating systems

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DEXTERITY IMPROVEMENT IN TELEOPERATION THROUGH computer VISION BASED AUTOMATIC CORRECTION

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IFAC Proceedings Volumes 2002年第1期35卷 473-478页

作者： J. Amat A. Casals L. Muñoz M. las Heras Robotics Institute. (IRI) UPC / CSIC Llorens Artigas 4-6 2a pt. 08028 Barcelona SPAIN Dep. Automatic Control and Computer Engineering Universitat Politècnica de Catalunya

Robot manipulation through teleoperation requires some ability from a human operator. This requirement is stronger when the tridimensional scene is observed through a 2D monitor. This paper describes a telemanipulation aiding system based on the superposition of a position correction component to the manual orders given by the human operator, through his gestures. This correction will enable the slave arm to move quicker when it is far from the target, while moving slower and more precisely when it operates close to the target, thus, the system behaves as if an external attraction force appear around the possible objects to be manipulated.

关键词： Telerobotics Telemanipulation computer Vision Man-Machine Interface Stereo Vision

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An extension of weighted strategy sharing in cooperative Q-learning for specialized agents

An extension of weighted strategy sharing in cooperative Q-l...

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International Conference on Neural Information Processing

作者： S.M. Eshgh M.N. Ahmadabadi School of Intelligent Systems Institute of Studies in Theoretical Physics and Mathematics Tehran Iran Control and Intelligent Processing Center of Excellence and Robotics Laboratory Department of Electrical and Computer Engineering University of Tehran Tehran Iran

Using other agents' experiences and knowledge, a learning agent may learn faster, make fewer mistakes, and create some rides for unseen situations. These benefits will be gained if the learning agents know the area of expertise and the expertness values of each other. In this paper, some Q-learning agents with different skills and expertness levels cooperate in learning. The agents use some criteria to judge others information and knowledge. Four expertness criterion, certainty and entropy measures are used to assign degrees of importance to others' Q-Tables. Effects of measuring these values based on their whole Q-Table, a portion of Q-Tables that reflects their proficiencies, and the states in Q-Tables on the learning quality are studied. Simple strategy sharing and two different weighted strategy-sharing methods are used to combine the acquired knowledge from different agents.

关键词： Intelligent robots Intelligent agent Process control control systems Intelligent control Laboratories Intelligent systems Physics Mathematics Entropy

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Certainty and expertness-based credit assignment for cooperative Q-Learning agents with an AND-type task

Certainty and expertness-based credit assignment for coopera...

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International Conference on Neural Information Processing

作者： A. Harati M.N. Ahmadabadi School of Intelligent Systems Institute of Studies in Theoretical Physics and Mathematics Tehran Iran Control and Intelligent Processing Center of Excellence & AI and Robotics Laboratory Department of Electrical and Computer Engineering University of Tehran Tehran Iran

In multiagent reinforcement learning, inter-agent credit assignment is a fundamental problem, since a single scalar reinforcement signal is the only reliable feedback that teams of learning agents receive. This problem is more critical in groups of independent learners with a joint task. In this research, it is assumed that a critic agent receives the environment feedback and assigns a proper credit to each agent using some measures. Three of such measures for a team of cooperative agents with a parallel and AND-type task are introduced. These measures somehow compare the agents' knowledge. One of these criteria, called normal expertness, is a non-relative measure while two other ones (certainty and relative normal expertness) are relative measure. It is experimentally shown that relative measures work better as they contain more information for the critic agent.

关键词： Feedback Intelligent agent Intelligent robots Process control control systems Intelligent control Artificial intelligence Robot kinematics Physics computing Reliability engineering

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