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The window corner algorithm for planning translational paths among polyhedral subassemblies

The window corner algorithm for planning translational paths...

引用

1992 IEEE/RSJ International Conference on Intelligent Robots and Systems, IROS 1992

作者： Krishnan, S.S. Sanderson, A.C. New York State Center for Advanced Technology in Automation and Robotics and Electrical Computer and Systems Engineering Department Rensselaer Polytechnic Institute TroyNY12180 United States

ISBN: (纸本)0780307372

In this paper, we present a complete and exact algorithm for planning a geometrically feasible path for a polyhedral subassembly (robot) translating amongst polyhedral obstacles. Our algorithm can be used to determine whether a pair of non-convex subassemblies can be separated by a sequence of fine-motions and, possibly, contact-motions, when the amount of free space tends to be severly limited. We present the three-dimensional Window Corner algorithm to plan feasible paths. The algorithm solves the FeosiblePath problem, in worst-case time O(m5) where m is the product of the number of vertices describing the robot and obstacles respectively. A Feasiblepath solution hierarchy, for assembly sequence planning, is described for incremental, straight-line and multi-step paths. The Polyhedral Cone Representation (PCR) is introduced to efficiently represent the geometrical constraints on translation and as a basis for fast collision avoidance checks. We introduce the concept of Window Corners in the PCR and this results in a finite search space. The Polyhedral Cone Obstacle Representation (PCUR), which is a constructive representation of all boundary contact configurations, transforms the problem into that of a point moving amongst a collection, O(m), of convex obstacles. In comparison, the worstcase space complexity of the C-space boundary is O(m3). Certain contact-constrained, feasible motions, which lie on surfaces without interior points can be inaccessible in a typ i d C-space representation. © 1992 Institute of Electrical and Electronics Engineers Inc. All rights reserved.

关键词： Robot programming

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Workcell based robot design methodologies

Workcell based robot design methodologies

引用

ASME 1998 Design Engineering Technical Conferences, DETC 1998

作者： Derby, Stephen Director Mechatronics and Assembly Lab New York State Center for Advanced Technology in Automation Robotics and Manufacturing Rensselaer Polytechnic Institute TroyNY12180 United States

ISBN: (纸本)9780791880319

This paper details a set of methodologies to design a robot based on an existing workcell that would be difficult or costly to modify. Standard robot bases, as well as tracked robots, are located to minimize the error of the desired taught robot gripper positions. Error levels are established based on the angle of the misalignment and the length of the required loading or unloading motion. A computer program was written to implement these methods. © 1998 by ASME.

关键词： Robots

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An Information Theoretic Approach to Approximate Reasoning

An Information Theoretic Approach to Approximate Reasoning

引用

1992 IEEE/RSJ International Conference on Intelligent Robots and Systems, IROS 1992

作者： Gottschlich, S.N. Stephanou, H.E. New York State Center for Advanced Technology in Automation and Robotics Electrical Computer and Systems Engineering Department Rensselaer Polytechnic Institute TroyNY12180-3590 United States

ISBN: (纸本)0780307372

In traditional geometric modeling, it is common to assume that models of objects created are complete and correct. Unfortunately in real life robots and other autonomous machines may have only uncertain knowledge of only a portion of an object's geometry and therefore we need to be able to create object models that are incomplete and uncertain. Towards this end we have developed mechanisms for representing geometric entities in terms of Dempster-Shafer belief functions. To do this we have extended the notion of belief functions to include continuous frames of discernment. A fractal model of the belief functions is developed and information theory concepts are applied for reasoning about a sensor data model vis-a-vis reference object models. An implementation of these concepts and experiments involving them are discussed. © 1992 IEEE.

关键词： Uncertainty analysis

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Volumetric Based Inspection

Volumetric Based Inspection

引用

1992 IEEE/RSJ International Conference on Intelligent Robots and Systems, IROS 1992

作者： Tarbox, G.H. Gottschlich, S.N. Gerhardt, L.A. New York State Center for Advanced Technology in Robotics and Automation Electrical Computer and Systems Engineering Department Rensselaer Polytechnic Institute TroyNY12180-3590 United States

ISBN: (纸本)0780307372

A novel approach to inspection is presented based on comparing a volumetric representation of a reference object to a volumetric representation of an actual object iteratively created from sensor data. The use of volumetric representations gives this approach a number of distinct advantages over the more traditional surface-based inspection methods. One significant advantage of volumetric inspection is that there is no need to identify geometric "features", particularly important when inspecting objects such as castings and forgings whose features are often difficult to identify. Secondly, the volumetric representation lends itself naturally to a multi-sensor environment. By this we mean that a volumetric model of the sensed object can be synthesized utilizing information from multiple sensors of varying types, accuracy, location, etc. This allows a choice of the most appropriate sensor for acquiring information about the different regions of the object. Finally, the volumetric representation allows us to carry out true three-dimensional inspection as opposed to the typical approach where renderings of the reference model are compared to two-dimensional images of the actual object. © 1992 IEEE.

关键词： Inspection

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Description and kinematic analysis of the Anthrobot-2 dextrous hand

Description and kinematic analysis of the Anthrobot-2 dextro...

引用

IEEE International Symposium on Intelligent Control (ISIC)

作者： J. Vanriper M.S. Ali K.J. Kyriakopoulos H.E. Stephanou New York State Center for Advanced Technology in Automation and Robotics Rensselaer Polytechnic Institute Troy NY USA

An anthropomorphic five-fingered hand, the Anthrobot-2, is described. It features anatomical consistency with a human hand, giving it special advantages during teleoperation. Each finger has four joints as in the human hand: two at the knuckle, one between the proximal and middle finger segments, and one between the middle and distal finger segments. The thumb has four degrees of freedom, allowing it to emulate human thumb motion. The controlling hardware and the kinematic analysis, including forward and inverse kinematics, are presented. Future research is discussed.< >

关键词： Kinematics Fingers robotics and automation Robots End effectors Jacobian matrices Software prototyping Prototypes NASA Servomechanisms

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Fuzzy distance functions for motion planning

Fuzzy distance functions for motion planning

引用

International Conference on Tools for Artificial Intelligence (ICTAI)

作者： K. Sridharan H.E. Stephanou New York State Center for Advanced Technology in Automation and Robotics Rensselaer Polytechnic Institute Troy NY USA

The problem of planning motions offline for a robot in the presence of obstacles via an algorithm that does not proceed by a discretization of the search space involves defining good heuristics to characterize the proximal relationships between two rigid bodies and the development of algorithms for their computation. Several measures are presented, and schemes for their computation are developed. The performances of the algorithms are determined in terms of their running time. The advantage of the fuzzy model is that it lends itself easily to numerical computation involving manipulation of the coordinates of the extreme points.< >

关键词： Motion planning robotics and automation Fuzzy sets Robots Bandwidth Motion measurement Motion detection Manipulators Euclidean distance Algorithm design and analysis

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IVIS: an integrated volumetric inspection system

IVIS: an integrated volumetric inspection system

引用

Proceedings of the CAD-Based Vision Workshop

作者： G.H. Tarbox S.N. Gottschlich New York State Center for Advanced Technology in Automation and Robotics Rensselaer Polytechnic Institute Troy NY USA

Presents a novel approach to automated visual inspection based on comparing volumetric models of a reference object to a model of an actual object iteratively created from sensor data. The use of volumetric models gives this approach a number of distinct advantages over more traditional surface-based methods. First, there is no need to identify "features" which is important when inspecting objects whose features are difficult to identify. Second, volumetric inspection lends itself naturally to multi-sensor applications. Finally, true 3-D comparisons of the reference and sensed objects can be easily carried out using volumetric models.< >

关键词： Inspection Solid modeling robotics and automation Casting Machining Materials science and technology Geometry Robot sensing systems Manufacturing industries Production

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Issues in Fine Motion Planning for Assembly

Issues in Fine Motion Planning for Assembly

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Annual Conference on Intelligent Robotic Systems for Space Exploration

作者： S. Gottschlich New York State Center for Advanced Technology in Robotics and Automation Rensselaer Polytechnic Institute Troy NY USA

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Dynamic modeling and force/position control for the Anthrobot dextrous robotic hand

Dynamic modeling and force/position control for the Anthrobo...

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IEEE Conference on Decision and Control

作者： A.R. Zink K.J. Kyriakopoulos New York State Center for Advanced Technology in Automation and Robotics Rensselaer Polytechnic Institute Troy NY USA

The problem of position control and unit consistent hybrid position/force control of the Anthrobot robot hand is considered. A dynamic model, for the Anthrobot, is used to develop the control laws. The experimental re... 详细信息

关键词： Force control Position control Robots robotics and automation Fingers Servomechanisms Regulators Analog-digital conversion Kinematics Manipulators

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The kinematics of the Anthrobot-2 dextrous hand

The kinematics of the Anthrobot-2 dextrous hand

引用

IEEE International Conference on robotics and automation (ICRA)

作者： M.S. Ali K.J. Kyriakopoulos H.E. Stephanou New York State Center for Advanced Technology in Automation and Robotics Rensselaer Polytechnic Institute Troy NY USA

An anthropomorphic dextrous robotic hand (Anthrobot-2) is described. Its forward and inverse kinematics, as well as its Jacobians are developed as the first step toward its utilization for either teleoperation or autonomous operation. The Anthrobot frames are assigned using the modified Denavit-Hartenberg formulation, referred to as the hand frame. A finger with proximal link contact point is described.< >

关键词： Kinematics Fingers Thumb robotics and automation Humans End effectors Jacobian matrices Robots Anthropomorphism Spraying

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