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Volumetric Based Inspection

Volumetric Based Inspection

引用

IEEE International Workshop on Intelligent Robots and systems (IROS)

作者： G.H. Tarbox S.N. Gottschlich L.A. Gerhardt Electrical Computer and Systems Engineering Department Rensselaer Polytechnic Institute New York State Center for Advanced Technology in Robotics and Automation Troy NY USA

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A Perturbation Refinement Method for Nonholonomic Motion Planning

A Perturbation Refinement Method for Nonholonomic Motion Pla...

引用

American Control Conference (ACC)

作者： A.W. Divelbiss J. Wen New York State Center for Advanced Technology in Robotics and Automation Department of Electrical Computer and Systems Engineering Rensselaer Polytechnic Institute Troy NY USA

The kinematic path planning problem of a nonholonomic system can be posed as a point-to-point control problem of a nonlinear system. This system has the property that it is not locally stabilizable but is globally controllable. In this paper, we present a new algorithm for constructing a feasible path between specified initial and final configurations. Polyhedral constraints in both configuration and non-configuration spaces (possibly non-convex) can also be incorporated in this framework. The algorithm is based on the assumption that the system is usually controllable about a non-trivial trajectory, which is true for many cases. An initial trajectory is iteratively warped until the desired final configuration is reached. Examples of a front-wheel driven car, and tractors with one, two, and three trailers are included to illustrate the efficacy of the proposed algorithm.

关键词： Control systems Kinematics Adaptive control Convergence Iterative algorithms Motion planning robotics and automation systems engineering and theory Path planning Position control

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Use of monocular groupings and occlusion analysis in a hierarchical stereo system

Use of monocular groupings and occlusion analysis in a hiera...

引用

Conference on computer Vision and Pattern Recognition (CVPR)

作者： R.C. Chung R. Nevatia Institute for Robotics and Intelligent Systems Department of Electrical Engineering and Computer Science University of Southern California Los Angeles CA USA

A hierarchical stereo system is described that uses structural descriptions up to the surface level. Surface descriptions are computed from monocular images, by using a perceptual grouping technique. Occlusion can be a major problem in stereo analysis and is often not treated explicitly. An analysis is presented of occlusion effects in stereo, and it is shown how structural descriptions can be used to deal with them. Experimental results are given for scenes with curved objects and significant occlusions.< >

关键词： Layout Intelligent robots Surface treatment Stereo image processing Image reconstruction Intelligent systems Intelligent structures Hierarchical systems Monitoring Contracts

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Flow equivalent nets for the performance analysis of generalized stochastic Petri nets

Flow equivalent nets for the performance analysis of general...

引用

IEEE International Conference on robotics and Automation (ICRA)

作者： H. Jungnitz A.A. Desrochers Center for Intelligent Robotics for Space Exploration (CIRSSE) Electrical Computer and Systems Engineering Department Rensselaer Polytechnic Institute Troy NY USA

The reduction of the state space of generalized stochastic Petri net (GSPN) models is discussed. For a certain class of GSPNs it is possible to analyze subnets in isolation by keeping the number of tokens in the net constant. The authors construct a flow equivalent net (FEN), which has the same temporal and input/output properties of the original net, but with a strongly reduced state space. The FEN is substituted back into the complement of the original net.< >

关键词： Performance analysis Stochastic processes Petri nets State-space methods Stochastic systems Intelligent robots Coupled mode analysis System recovery Orbital robotics Space exploration

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A feasible collision-detection algorithm for mobile robot motion planning with moving obstacles

A feasible collision-detection algorithm for mobile robot mo...

引用

International Conference on Industrial Electronics, Control and Instrumentation

作者： T.-J. Pan R.C. Luo Department of Information Engineering Tatung Institute of Technology Taipei Taiwan Robotics and Intelligent Systems Laboratory Department of Electrical and Computer Engineering North Carolina State University Raleigh NC USA

A new approach to solving the collision detection problem for mobile robots in the presence of moving obstacles is proposed. Both the robot and obstacles in the two-dimensional space are assumed to be polygonal and are composed of a set of convex polygons. The half-plane representation uses an algebraic method to describe the object motion including translation and rotation through time. Compared with previous methods, the proposed representation is more general in that obstacles are now allowed to move at nonconstant velocities. To detect collision between polygonal objects, a traversability vector method was developed. Traversability vectors are a simple mechanism used to analyze geometric constraints imposed by polygons. Using these vectors, a simple algorithm for predicting collision is derived. computer simulations were conducted to show the feasibility of the proposed method.< >

关键词： Mobile robots Motion planning Robot motion Orbital robotics Intelligent robots Technology planning Space technology Motion detection Object detection Prediction algorithms

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Identification and Multi-Objective Controller Tuning of a Plastic Injection Molding Machine

Identification and Multi-Objective Controller Tuning of a Pl...

引用

American Control Conference (ACC)

作者： C. M. Seaman A. A. Desrochers G. F. List Robotics & Automation Laboratories Rensselaer Polytechnic Institute Troy NY USA Electrical Computer & Systems Engineering Department Rensselaer Polytechnic Institute Troy NY USA Decision Sciences and Engineering System Department Rensselaer Polytechnic Institute Troy NY USA

In this paper, a multi-objective approach to controller tuning is described. An algorithm for implementation of this tuning is given. This approach has the following merits: there is no restriction on the type or number of performance criteria; no a 'priori weights need be chosen since performance criteria are not combined into a single objective function. The intention is that the algorithm is implemented to run in real-time so as to provide immediate feedback to a process operator about the current operating point. If the current operating point is not Pareto optimal, the algorithm can automatically adjust the parameters to achieve this. If it is Pareto optimal but not desirable, the algorithm can provide information on how trade-offs can be made so that the desired operating point is achieved. The algorithm is applied to the tuning of a PID controller for the plastication phase of an injection molding process. An analytic model for this process is presented. Experiments are described in which data was collected from this process, and an empirical discrete-time transfer function was identified. This transfer function was then used, within a simulation, to allow the algorithm to tune the controller, with respect to two objective functions. The tradeoff curve for these objectives, and corresponding controller gains is presented.

关键词： Plastics Injection molding Transfer functions Pareto optimization Three-term control Constraint optimization Minimization methods Problem-solving Delta modulation Error correction

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Task planning for flexible manufacturing systems

Task planning for flexible manufacturing systems

引用

1990 IEEE Colloquium in South America, COLLOQ 1990

作者： Sanderson, Arthur C. IEEE Robotics and Automation Society Electrical Computer and Systems Engineering Department Rensselaer Polytechnic Institute TroyNY1218 United States

ISBN: (纸本)0879426101

The design and implementation of flexible manufacturing systems require the planning of task requirements to meet standards of reliability, cost, and throughput over a family of products. Tools for computer-aided engineering of manufacturing systems utilize automated planning and representation methods to enhance the capability of engineers to design better systems. Automated assembly sequence planning methods link product design to assembly system design and provide a basis for such interactive engineering tools. Methods for geometric reasoning, assembly plan representation, and automated assembly sequence selection will be discussed. © 1990 IEEE.

关键词： Flexible manufacturing systems

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T-buffer: Fast visualization of relativistic effects in spacetime 90

T-buffer: Fast visualization of relativistic effects in spac...

引用

1990 Symposium on Interactive 3D Graphics, I3D 1990

作者： Hsiung, Ping-Kang Thibadeau, Robert H. Wu, Michael Carnegie Mellon University PittsburghPA15213 United States Department of Electrical and Computer Engineering Carnegie Mellon University United States Imaging Systems Laboratory Robotics Institute Carnegie Mellon University United States

ISBN: (纸本)0897913515

Wc have developed an innovative ray-tracing simulation algorithm to describe Welativistic Effects in SpaceTime ("REST"). Our algorithm, called REST-frame, models light rays that have assumed infinite speed in conventional ray-tracing to have a finite speed in spacetime, and uses the non-Newtonian Lorentz Transformation to relate measurements of a single event in different inertial coordinate systems {inertial frames). Our earlier work [5][6][7] explored the power of REST-frame as an experimentation tool to study the rich visual properties in natural world modeled by Special Relativity. Non-intuitive images of the anisotropic deformation ("warping") of space, the intensity concentration/spreading of light sources in spacetime, and the relativistic Doppler shift were visualized from our simulations. REST-frame simulations arc computationally expensive. Several hours of CPU time may be needed to generate one intricate image on a relatively powerful DECStation 3100. This high simulation cost of REST-frame precludes its application in interactive, real-time graphics environments. In this paper, we report a scanline based REST-frame rendering method that provides a faster alternative to the original ray-tracing based REST-frame implementation. This new method operates in the spirit of the classical Z-buffer in computer graphics[2] and the inter-inortial frames point-mapping method investigated in physics in the early 1960's[14][12], and determines the visibility of points in spacetime by their spatial and temporal visibility. Specifically, all spacetime event points that arc potentially visible from the viewpoint at the imaging time are geometrically projected in three dimensional (3D) space to the image plane pixel buffer. Multiple points with a same pixel affiliation arc sorted by their time distance © 1990 ACM.

关键词： Ray tracing

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IROS: an intelligent rehabilitative orthotic system for cerebrovascular accident

IROS: an intelligent rehabilitative orthotic system for cere...

引用

IEEE International Conference on systems, Man and Cybernetics

作者： S. Lee A. Agah G. Bekey Institute for Robotics and Intelligent Systems Department of Electrical Engineering University of Southern California Los Angeles CA USA Institute for Robotics and Intelligent Systems Department of Computer Science University of Southern California Los Angeles CA USA

An intelligent externally powered orthotic system (exoskeleton) for the treatment of motor dysfunctions of the upper extremities of stroke patients is described. IROS is an interactive and cooperative human-machine system, with both controlling the human arm. Initially, the machine is the main controller of the arm. As the patient improves, the human control of the arm increases, and the machine control of the arm decreases. The system combines the skills of professional therapists with a sensor-integrated orthosis and a real-time graphics system to ensure proper interaction and cooperation with the patient in order to achieve the goals of therapy. It uses the expertise of the therapists, which is incorporated into its knowledge system, while monitoring the sensory information from the patient, including the force, motion, and electromyogram (EMG) signals. The treatment-related tasks are displayed on the real-time graphic system to increase the interest and enhance the motivation of the patient. Such a system can be used to improve the rehabilitation process for stroke patients.< >

关键词： Intelligent systems Orthotics Medical treatment Machine intelligence Humans Real time systems Graphics Exoskeletons Extremities Man machine systems

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Time dilation visualization in relativity 90

Time dilation visualization in relativity

引用

Proceedings of the 1990 ACM/IEEE conference on Supercomputing

作者： Ping-Kang Hsiung Robert H. Thibadeau Christopher B. Cox Robert H. P. Dunn Department of Electrical and Computer Engineering Carnegie Mellon University Pittsburgh Pennsylvania Imaging Systems Laboratory The Robotics Institute Carnegie Mellon University Pittsburgh Pennsylvania Department of Physics Carnegie Mellon University Pittsburgh Pennsylvania Department of Art Carnegie Mellon University Pittsburgh Pennsylvania

ISBN: (纸本)9780897914123

This work extends our previous effort in visualizing the spatial aspect of relativistic effects, and treats the phenomenon of time dilation; an inherent temporal effect of special ***, we demonstrate through still-frame images and live animations that in observing the viewing independent time dilation, the finite light transit time involved in performing the observation makes the observed time dilation also depend on the viewing *** we introduce the physics of special relativity into ray-tracing and make time to pass as a ray travels through space, we are able to link the spatial and temporal dimensions in a fundamental and consistent way in our simulations, and generate images that reveal the spatial and temporal properties of the 4D geometry of *** exploration highlights the interplay of the imaging process and the imaged physical events in producing the final images. It reveals a richly detailed physical reality which the mathematical language of thought experiment in relatively does not directly provide.

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