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IEEE International Conference on Fuzzy systems (FUZZ-IEEE)

作者： T. Dorsam S. Fatikow I. Streit Institute for Real-Time Computer Systems awl Robotics Faculty for Informatics University of Karlsruhe Karlsruhe Germany

A fuzzy logic approach for the online grasp-force-adaptation, which can be used for the control of fine manipulating with a multifingered robot hand, will be presented in this paper. The kernel of this approach consists of decision making logic which expresses the a-priory knowledge about the force behaviour inside the friction cones and the necessary reactions, regarding the criterion for grip stability. For the software realisation of the fuzzy control approach a Fuzzy-C Development System supporting the entire development process was used. Two corresponding fuzzy controllers have been designed: A finger controller and a grasp controller. During fine manipulations of an object the fuzzy controller interacts with an underlying conventional controller that receives, after defuzzyfication, the adapted force values which were applied. A computer based simulation system was developed to analyse the capabilities of the designed fuzzy controllers.< >

关键词： Robots Fuzzy control Force control Fuzzy logic Kernel Decision making Friction Stability criteria Fingers Computational modeling

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A variable structure force controller for robotic manipulators

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IFAC Proceedings Volumes 1994年第14期27卷 481-486页

作者： I.E. Paromtchik M. Damm L.I. Matioukhina University of Karlsruhe Institute for Real-Time Computer Systems and Robotics D-76128 Karlsruhe Germany

Hybrid position/force control for robotic manipulators is considered. The control is carried out in task coordinates. For the force control the non-linear variable structure controller is presented and investigated. The controller maintains the system to reach and remain at the switching hypersurfaces, consisting of internal coordinates of the force controller. The stability of the system and the existing of the sliding mode are analyzed by means of the second Lyapunov method. The developed non-linear force controller was implemented for the hybrid position/force control of a PUMA 200 manipulator. The experimental setup and obtained results are described.

关键词： Position/force control robot variable structure systems stability

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Emulation of spline curves and its applications in robot motion control

Emulation of spline curves and its applications in robot mot...

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IEEE International Conference on Fuzzy systems (FUZZ-IEEE)

作者： J. Zhang J. Raczkowsky A. Herp Institute for Real-Time Computer Systems and Robotics University of Karlsruhe Germany

The paper presents the design of a fuzzy controller to emulate spline curves for generating smooth motion trajectories. Spline models and a fuzzy control model are compared. Based on this comparison, a fuzzy control model is devised to make the robot continuously pass through the planned subgoals guiding the robot motion. By analyzing primitive movements along subgoals, the rule base can be developed. System structures are proposed for applying this fuzzy controller in the hierarchical motion control of robot systems. Its applications in robot arms and mobile robots are also presented.< >

关键词： Emulation Spline Robot motion Motion control Robot control Fuzzy control Control systems Intelligent robots Fuzzy systems Robot sensing systems

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A practical approach to motion generation and control for an omnidirectional mobile robot

A practical approach to motion generation and control for an...

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IEEE International Conference on robotics and Automation (ICRA)

作者： I.E. Paromtchik U. Rembold Institute for Real-Time Computer Systems and Robotics University of Karlsruhe Karlsruhe Germany

Path generation execution and motion control for an omnidirectional mobile robot (vehicle) are considered. real-time path generation is based on the polynomial spline-interpolation with prediction of velocities of a spline-function. The mobile vehicle control is performed with the use of its kinematic model and digital PID-controllers of the wheels. The theoretical approach is illustrated by the obtained experimental results.< >

关键词： Motion control Mobile robots Spline Remotely operated vehicles Sensor systems Polynomials Communication system control Kinematics Wheels Space vehicles

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Design of a fuzzy controller for optimal execution of subgoal-guided robot motions

Design of a fuzzy controller for optimal execution of subgoa...

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IEEE International Conference on robotics and Automation (ICRA)

作者： Jianwei Zhang A. Herp Inst. for Real-Time Computer Systems and Robotics Karlsruhe Univ. Germany Institute for Real-Time Computer Systems and Robotics Department of Computer Science University of Karlsruhe Karlsruhe Germany

In this paper, an approach is presented for designing a robot controller to integrate path planning and motion execution. Instead of following an exactly planned geometric path, which cannot be easily modified to deal with uncertainties, a robot realizes its motion under the guidance of a sequence of grossly selected crucial points called subgoals. A fuzzy model is used for on-line controlling the robot to pass through the subgoals smoothly. With the help of heuristics for optimal motion control, the rule base can be developed. Such a concept provides a control method in real time as well as a possibility of integrating sensor data for the subgoal-guided motion.< >

关键词： Fuzzy control Optimal control Motion control Path planning Orbital robotics Robot sensing systems Motion planning Collision avoidance Solid modeling Control systems

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Concurrent simulation and control of robot tasks

Concurrent simulation and control of robot tasks

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Annual Hawaii International Conference on System Sciences (HICSS)

作者： Mehlhaus Institute for Real-Time Computer Systems and Robotics University of Karlsruhe Karlsruhe Germany

In the area of telerobotics, where remote systems are to be controlled, it is helpful to plan subsequent operations based on as much relevant data as possible. The simulation of the remote system, executed in parallel, can provide additional information, otherwise difficult or impossible to retrieve from sensor feedback. In this paper, the integrated DiSCUS environment (Distributed Simulation and Control in a Unix System) is presented, which is used for the simulation and the control of a small assembly cell. All (physical and logical) components are represented as stand-alone programs, as tasks. These tasks are distributed over a workstation network, so that "true" parallelism can be achieved.< >

关键词： Distributed computing Distributed control Telerobotics

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Extensive manipulation capabilities and reliable behavior at autonomous robot assembly

Extensive manipulation capabilities and reliable behavior at...

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IEEE International Conference on robotics and Automation (ICRA)

作者： T.C. Lueth U. Rembold Institute for Real-Time Computer Systems and Robotics IPR University of Karlsruhe Karlsruhe Germany

Different powerful extensions and improvements of the control architecture of an autonomous robot are presented. They are used to increase the reliability of robot assembly and to reach a sufficient behavior. The decision to use autonomous assembly robots in an industrial manufacturing setting depends mainly on the reliability of such a system and the extension of its manipulation capabilities. The Karlsruhe Autonomous Mobile Robot (KAMRO) is a robot system that is able to take on, and to execute, assembly tasks autonomously. Although the robot was able to work without human intervention within a limited scope, the reliability of the system was unfortunately not adequate for large-scale applications. This paper describes how the reliability has been improved and which experiments were performed to evaluate the concept.< >

关键词： Robotic assembly Service robots Power system reliability Mobile robots Electrical equipment industry Manufacturing industries Assembly systems Humans Large-scale systems Performance evaluation

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An approach to motion planning for mobile manipulation

An approach to motion planning for mobile manipulation

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IEEE International Workshop on Intelligent Robots and systems (IROS)

作者： U.M. Nassal Institute for Real-Time Computer Systems Robotics IPR University of Karlsruhe (FZI) USA

Increasing the flexibility of robot systems has been one of the main objectives of robotics research in recent years, There are various approaches to achieve this: increasing fault-tolerance on different levels, the development of sophisticated sensors, grippers and manipulators, and the use of learning techniques. But the field of operation of such smart systems is still limited to a rather small area. Mobile manipulation is another facet of increasing the flexibility of a robot system. By exploiting the mobility of a platform, the dexterous workspace of manipulators can be considerably increased. One main research topic on mobile manipulation is the decomposition of the motion of the tool-center-point into manipulator motion and platform motion. In this paper a new online approach to this decomposition is presented which allows the consideration of complex obstacles and multiple manipulators mounted on the platform. Simulation studies verify the suitability of the approach. Some of the realized algorithms have been applied to a real mobile two-arm system.< >

关键词： Control systems Robot sensing systems Mobile robots Vehicle dynamics Robotic assembly Gravity Motion planning Robot kinematics Manipulator dynamics real time systems

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Decentralized control of distributed intelligent robots and subsystems

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Annual Review in Automatic Programming 1994年第C期19卷 281-286页

作者： Laengle, Th Lueth, T.C University of Karlsruhe Faculty for Informatics Institute for Real-Time Computer Systems and Robotics 76128 Karlsruhe Prof. Dr.-Ing. U Rembold Prof. Dr.- Ing. R. Dillmann Germany

In a distributed robot system, asynchronous and synchronous communication between the system components is necessary to guarantee problem soliving capability in realtime. On that account, the distributed control architecure of the Karlsruhe Autonomous Mobile Robot KAMRO which is being developed at IPR has been extended by these communication kinds. The robot system consists of several subcomponents, like manipulators, two hand-eyecameras, one overhead camera and a mobile platform. To get better problem solving capability than the former centralized control architecture, these components are able to work together in teams (asynchronous communication) or special agents (synchronous communication). © 1995.

关键词： control theory Distributed control real-time computer systems robot control architecture robots

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Neural-fuzzy force control using a TAI-lorable parallel computer concept

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IFAC Proceedings Volumes 1994年第14期27卷 151-156页

作者： S. Fatikow B. Magnussen T. Doersam University of Karlsruhe Faculty for Informatics Institute for Real-Time Computer Systems and Robotics Kaiserstr. 12 76128 Karlsruhe Germany

In this paper a new control system for the intelligent force control of multifingered robot grips is presented. The multi-level system architecture combines both fuzzy-based and a neural-based control algorithms. After defining the fine manipulation problem fuzzy and neural controller are developed. The demands of flexibility and real-time control of the implementation of the control system are suited by a tailorable parallel computer concept. The basic ideas of the concept are to set up each processing element and the communication individually for its application

关键词： Force control fuzzy control neural nets real time computer systems parallel processing

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