A legged robot "JROB-1" is developed for a robotics research platform as a result of inter-university research program on intelligent robotics supported by the Ministry of Education Grant-in-Aid for Scientif...
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A legged robot "JROB-1" is developed for a robotics research platform as a result of inter-university research program on intelligent robotics supported by the Ministry of Education Grant-in-Aid for Scientific Research on Priority Areas in Japan. The JROB-1 features: 1) self-contained, 2) RT-Linux running on PG/AT processes vision and sensor processing, motion planning and control, 3) connected to a network via radio Ethernet as to utilize networked resources, 4) Fujitsu color tracking vision board and Hitachi general purpose vision processing board, 5) all parts are commercially available, and 6) it is extensible with respect to sensor, sensor processing hardware and software. JROB-1 is expected to be a common testbed for experiment and intelligent robotics research by integrating perception and motion.
Workflow technology is a particular kind of IT for supporting work by enacting explicitly modeled and represented business processes. Thus, conceptual models of business and work processes are essential for process de...
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Workflow technology is a particular kind of IT for supporting work by enacting explicitly modeled and represented business processes. Thus, conceptual models of business and work processes are essential for process design as well as for process support in the form of workflow enactment. The author describes the APM (Action Port Model) workflow modeling language which builds upon existing IS conceptual modeling languages. Even if based on traditional languages, APM is intended to be the basis for a flexible workflow support environment supporting ad hoc workflow, conform to ideas of workflow models as plans for situated action.
This paper deals with the development and application possibilities of a 2D thermovision sensing system based on infrared non-cooled detector and advanced HW/SW signal processing technology. The design and results fro...
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ISBN:
(纸本)0819426326
This paper deals with the development and application possibilities of a 2D thermovision sensing system based on infrared non-cooled detector and advanced HW/SW signal processing technology. The design and results from preliminary experiments are briefly described.
A manipulator with free joints is a class of under-actuated mechanisms. control of such systems is one of major topics in robotics and control engineering. In this paper, we apply the averaging method to manipulators ...
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A manipulator with free joints is a class of under-actuated mechanisms. control of such systems is one of major topics in robotics and control engineering. In this paper, we apply the averaging method to manipulators connected by free joints and describe their behaviors in response to periodic inputs. We analyze 2R and 3R free-joint manipulators and show that each system has invariant manifolds defined by an energy-like conserved quantity. We also develop a control method via feedback modulation of the input amplitude to reach a desired invariant manifold. The effectiveness of the method is verified by computer simulations.
A method using fuzzy logic and neural network structures for the identification and control of robot dynamics is presented in this paper. Fuzzy identifiers are employed to match the effects in the robot dynamics model...
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A method using fuzzy logic and neural network structures for the identification and control of robot dynamics is presented in this paper. Fuzzy identifiers are employed to match the effects in the robot dynamics model. Fuzzy logic systems used are represented as three-layer feedforward neural networks. Fuzzy system parameters are adjusted via backpropagation. An on-line tuning algorithm is employed. Simulation results obtained with a three degrees of freedom articulated arm are given.
In this paper, we propose a new algorithm for scheduling parallel programs represented as directed acyclic graphs onto multiprocessors with communication delays. In such systems, task duplication is known as a useful ...
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In this paper, we propose a new algorithm for scheduling parallel programs represented as directed acyclic graphs onto multiprocessors with communication delays. In such systems, task duplication is known as a useful technique for shortening the length of schedules. The proposed algorithm adopts several heuristics based on GAs as well as task duplication. To apply a GA to scheduling, we design chromosomes using list representation so that each chromosome can uniquely represent a schedule of tasks. We also design genetic operators to control the degree of replication of tasks. Through simulation studies for three kinds of parallel programs under various scheduling conditions, we compare the proposed algorithm with an established algorithm proposed by Kruatrachue. As a result, it is found that the new heuristic algorithm outperforms the previous algorithm especially when communication delays are relatively small.
A new method for the simultaneous tackling of the effects of incomplete and approximate robot models and that of the dynamic interaction with an unmodeled environment in robot control was recently outlined. The basic ...
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A new method for the simultaneous tackling of the effects of incomplete and approximate robot models and that of the dynamic interaction with an unmodeled environment in robot control was recently outlined. The basic idea was to gain adaptivity via tuning the parameters of the symplectic group inherent in the Hamiltonian description of classical mechanical systems. This description results in equations of uniform structure independent of the particular properties of the system to be controlled. Until now, only the effects of tuning of only special parameters were investigated by simulation for a special 3 DOF robot arm. In this paper, the behavior of a similar control with extended parameter space is considered in the case of a vertical 3 DOF SCARA robot. Simulation results are discussed for different nominal trajectories. The results reveal that this approach may open new prospects in the control of mechanical devices.
The authors describe an approach to perceptual organization and prediction/verification of hypotheses for detecting a polyhedral 3-D object in indoor scenes. This method is a sequence of different stages which allow a...
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The authors describe an approach to perceptual organization and prediction/verification of hypotheses for detecting a polyhedral 3-D object in indoor scenes. This method is a sequence of different stages which allow a reduction in the space of research and to give semantic significance to each primitive at different levels of representation. Since in indoor environments most of the objects are man-made, it appears that their morphological characteristics are essentially linear and regular, and for these reasons straight line segments are the best primitives available in order to detect such objects. From these primitives, geometric relations allow to obtain different classes of pair of segments which represent a second level in their algorithm. Next a method based on prediction and verification of hypotheses with score assignment is performed in order to create the third level, constituted by different simple geometric shapes as squares, rectangles, triangles and other polygons. Last stage is dedicated to the grouping of these different shapes by perceptual organization for finding complex objects in the scene. After a more detailed description of their algorithm, the authors prove that the method is both efficient and robust in the presence of noise like occlusion. Finally, experimental results obtained in the laboratory are shown in order to demonstrate the method's effectiveness.
A stability proof is presented for a nonlinear PD (NPD) controller and third order systems. Nonlinear-stiffness control has been described previously in the literature and experimentally demonstrated;but to date, no s...
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A stability proof is presented for a nonlinear PD (NPD) controller and third order systems. Nonlinear-stiffness control has been described previously in the literature and experimentally demonstrated;but to date, no stability proof has been given for systems of degree greater than 2 and the case where the stiff gain exceeds the limit established by the circle criterion. The limitation is important because, for this case, the circle is quite conservative and much of the benefit of NPD control comes with gains greater than could previously be proven to be stable. The stability of 3rd order systems with nonlinear-stiffness PD control and gains exceeding the circle-criterion limit is established by demonstrating a Lyapunov function. The damping achieved by high-gain NPD control is demonstrated by simulation.
The proceedings contains 42 papers. Topics discussed include robotics and manipulators, dynamics and control of flexible structures, deployment dynamics, impact dynamics, microgravity, multi-body dynamics, friction of...
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The proceedings contains 42 papers. Topics discussed include robotics and manipulators, dynamics and control of flexible structures, deployment dynamics, impact dynamics, microgravity, multi-body dynamics, friction of harmonic drive actuators, piezo-damping of light structures, laser communications.
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