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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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Optimal Motion Planning for Collision Avoidance of Mobile Robots in Non-stationary Environments

Optimal Motion Planning for Collision Avoidance of Mobile Ro...

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American Control Conference (ACC)

作者： K.J. Kyriakopoulos G.N. Saridis New York State Center for Advanced Technology in Automation and Robotics Rensaelaer Polytechnic Institute Troy NY 12160-3590 Rensselaer Polytechnic Institute Troy NY USA

An optimal control formulation of the problem of collision avoidance of mobile robots moving in general terrains containing moving obstscles is presented. A dynamic model of the mobile robot and the dynamic constraints are derived. Collision avoidance is guaranteed if the minimum distance between the robot and the objects is nonzero. A nominal trajectory is assumed to be known from off-line planning. The main idea is to change the velocity along the nominal trajectory so that collisions are avoided. Furthermore, time consistency with the nominal plan is desirable. A numerical solution of the optimization problem is obtained. A perturbation control type of approach is used to update the optimal plan. Simulation results verify the value of the proposed strategy.

关键词： Motion planning Collision avoidance Mobile robots robotics and automation Optimal control Orbital robotics Path planning Robot sensing systems Tellurium Planing

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Inducing patterns of behavior in distributed system processes

Inducing patterns of behavior in distributed system processe...

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IEEE International Conference on robotics and automation (ICRA)

作者： V.G. Kountouris H.E. Stephanou School of Information Technology and Engineering George Mason University Fairfax VA USA New York State Center for Advanced Technology in Automation and Robotics Rensselaer Polytechnic Institute Troy NY USA

The authors utilize a class of Petri nets, called colored Petri nets (C/P-nets), to induce patterns of behavior in synchronization structures. These patterns of behavior locally specify the interactions between the distributed system's processes. The induction of patterns of behavior in synchronization structures results in the specification of coordination structures. A coordination structure is a specification of the interaction behavior of a distributed system's processes in a particular context. C/P-nets are used for the differentiation of the system's context-sensitive variables and the representation of their instantiations. The three possible interactions between any two concurrent processes of the distributed system are specified.< >

关键词： Intelligent robots Control systems Petri nets robotics and automation Automatic control Kinematics Calculus Information technology Multiagent systems Robot control

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An integrated collision prediction and avoidance scheme for mobile robots in non-stationary environments

An integrated collision prediction and avoidance scheme for ...

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IEEE International Conference on robotics and automation (ICRA)

作者： K.J. Kyriakopoulos G.N. Saridis New York State Center for Advanced Technology in Automation and Robotics Rensselaer Polytechnic Institute Troy NY USA NASA Center of Intelligent Robotic Systems for Space Exploration Rensselaer Polytechnic Institute Troy NY USA

A formulation that makes possible the integration of collision prediction and avoidance stages for mobile robots moving in general terrains containing moving obstacles is presented. A dynamic model of the mobile robot and the dynamic constraints are derived. Collision avoidance is guaranteed if the distance between the robot and a moving obstacle is nonzero. A nominal trajectory is assumed to be known from off-line planning. The main idea is to change the velocity along the nominal trajectory so that collisions are avoided. A feedback control is developed and local asymptotic stability is proved if the velocity of the moving obstacle is bounded. Simulation results verify the value of the proposed strategy.< >

关键词： Mobile robots robotics and automation Intelligent robots Orbital robotics Trajectory Motion planning Path planning Collision avoidance Space technology NASA

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AMP-CAD: an assembly motion planning system

AMP-CAD: an assembly motion planning system

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IEEE International Conference on robotics and automation (ICRA)

作者： S.N. Gottschlich A.C. Kak New York State Center for Advanced Technology in Robotics and Automation Rensselaer Polytechnic Institute Troy NY USA Robot Vision Lab School of Electrical Engineering Purdue University West Lafayette IN USA

The authors discuss a system, called AMP-CAD, which develops assembly motion plans using CAD models of parts. They place an emphasis on the calculation of the potential fields used for motion planning. Potential fields can be thought of as a mechanism to interface CAD representations with plan development. AMP-CAD is a complete system that combines an assembly representation, a two-phase motion planner, and a execution unit into a single integrated package. Implementation and experimental results are discussed.< >

关键词： Assembly systems Uncertainty Robotic assembly Motion planning Aggregates Solid modeling Force control Torque control robotics and automation Fitting

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Issues in fine motion planning for assembly 3

Issues in fine motion planning for assembly

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3rd Annual Conference on Intelligent Robotic Systems for Space Exploration, IRSSE 1991

作者： Gottschlich, Sue New York State Center for Advanced Technology in Robotics and Automation Rensselaer Polytechnic Institute TroyNY12180-3590 United States

ISBN: (纸本)0818625953

A common problem in robotic assembly is that of mating tightly fitting parts when the locations and the dimensions of the parts are somewhat uncertain. Because the clearances allowed between mating features of parts are likely to be smaller then the aggregate uncertainties, it is often necessary to use sensoryguided motions, as opposed to point-to-point motions, for carrying out portions of an assembly operation. In this paper we will discuss a fine motion planner that develops motion plans for assembly operations where force/torque guided motions are incorporated into the plan as needed. While much work in fine motion planning has focused on dealing with the uncertainties involved, this paper will expose equally important issues that arise in assembly motion planning due to the complicated geometry of assembly parts and the tight clearances allowed between mating features of assembly parts. © 1991 IEEE.

关键词： Motion planning

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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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A quantitative treatment of multilevel specificity and certainty in variable precision reasoning

A quantitative treatment of multilevel specificity and certa...

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IEEE Conference on Decision and Control

作者： W.L. Perry H.E. Stephanou Rand Corporation DC USA The New York State Center of Advanced Technology in Automation and Robotics Rensselaer Polytechnic Institute Troy NY USA

The authors develop a methodology for reasoning about the state of the environment based on evidence received from some source. It is assumed that the evidence is expressed as a probability mass function defined on a discrete set of mutually exclusive hypotheses about the state of the environment. Given that the quality of the evidence is variable, it follows that the precision of the reasoning process must also vary. That is, the level of specificity and the certainty associated with decisions made at that level depend directly on the quality of the evidence. An indistinguishability measure is used to generate a core set of aggregate focal elements, each of which may consist of logical disjunctions of the basic hypothesis set. The measure takes into account both the differences in support levels for the hypotheses and the degree to which they are similar. Partial dominance is then used to associate a basic probability assignment on the core set. This approach makes it possible to apply simple, quantitative methods to express the variations in the precision associated with decisions. The result is a set of aggregate hypotheses and their support levels which become input to the classification process. In most cases, multiple sets of aggregate hypotheses will be used in an evidential classification scheme to produce a composite characterization of the environment.< >

关键词： robotics and automation Uncertainty Aggregates Production Probability distribution

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Dynamic modularization and synchronization for intelligent robot coordination: the concept of functional time-dependency

Dynamic modularization and synchronization for intelligent r...

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IEEE International Conference on robotics and automation (ICRA)

The intelligent coordination of multiple robots requires modularization of robots at some level higher than the joint, corresponding task representations, and a concept of time that allows the dynamic specification of task synchronization. The necessary representations of robots and tasks are developed, and the structural and operational semantics of the primitive task and reflex models are specified. A concept of time, called functional time-dependency, that allows the dynamic specification of the distributed semantics during task execution by multiple robots is developed. The utility of functional time-dependency is shown using two examples.< >

关键词： Intelligent robots Manipulator dynamics Robot kinematics robotics and automation Information technology Transportation Concurrent computing

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