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IEEE International Conference on robotics and automation (ICRA)

作者： K. Sridharan H.E. Stephanou S.S. Keerthi New York State Center for Advanced Technology in Automation and Robotics Rensselaer Polytechnic Institute Troy NY USA Department of Computer Science and Automation Indian Institute of Science Bangalore India

Given two objects, A and B, such that A intersection B not= theta , the authors define a measure to characterize the penetration between A and B. They present fast algorithms for computing the measure for planar and p... 详细信息

关键词： Path planning robotics and automation Computer science Object detection Motion measurement Robot motion Euclidean distance Linear programming

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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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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)

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 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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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)

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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Applications of computational intelligence in industrial automation

Applications of computational intelligence in industrial aut...

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IEEE/IAS International Conference on Industrial automation and Control, IA & C

作者： K. Sridharan H.E. Stephanou S.S. Keerthi New York State Center for Adv. Technol. in Autom. & Robotics Rensselaer Polytech. Inst. Troy NY USA New York State Center for Advanced Technology in Automation and Robotics Rensselaer Polytechnic Institute Troy NY USA Department of Computer Science and Automation Indian Institute of Science Bangalore India

Techniques such as genetic algorithms, simulated annealing and evolutionary programming constitute a discipline often referred to as computational intelligence. During the past decade, a number of computationally difficult problems in optimization have been solved reasonably well by application of these techniques. The authors' goal in the paper is to present a brief description of these techniques and consider some applications to engineering problems.< >

关键词： Computational intelligence Computer industry Genetic algorithms robotics and automation Simulated annealing Application software Computational modeling Computer simulation Genetic programming Biological system modeling

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Tetrobot: A Modular System for Hyper-Redundant Parallel robotics

Tetrobot: A Modular System for Hyper-Redundant Parallel Robo...

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IEEE International Conference on robotics and automation (ICRA)

作者： G.J. Hamlin A.C. Sanderson Electrical Computer and Systems Engineering Department Rensselaer Polytechnic InstituteNew York State Center for Advanced Technology in Automation and Robotics Rensselaer Polytechnic Institute RPI Troy NY USA

A modular system for the design, implementation, and control of a class of highly redundant parallel robotic mechanisms is described. The Tetrobot system features a novel concentric multilink spherical (CMS) joint which allows an arbitrary number of links to share a common center of rotation. The CMS joint facilitates the construction of a wide variety of variable geometry truss mechanisms using an integrated control and computational framework. A distributed control algorithm is based on an iterative virtual force based solution which propagates the goal positions of target nodes to determine systematic adjustments of actuators. Capabilities of the Tetrobot system have been demonstrated by the construction of several configurations of up to 18 nodes, 48 links, and 15 actuators. Implementations of a double Stewart platform and a six-legged walker, constructed from the same set of parts, are described in this paper.

关键词： Parallel robots Collision mitigation Actuators Concurrent computing Design engineering Systems engineering and theory Electric variables control Control systems Computational geometry Centralized 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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Process monitoring and control for robotic resistive welding

Process monitoring and control for robotic resistive welding

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IEEE Conference on Control technology and Applications (CCTA)

作者： D. Mintz J.T. Wen Electrical Computer and Systems Engineering Department Rensselaer Polytechnic Institute New York State Center for Advanced Technology in Automation Troy NY USA

Spot welding is a commonly used process for joining metals. Under nominal operating conditions, existing weld controllers can produce high quality welds. In practice, however, the process can significantly deviate from the nominal condition, and thus compromise the quality of the weld. This paper presents an overview of the main contributing factors to the process variation and suggest methods to detect and ameliorate them.

关键词： Monitoring Robot control Process control Spot welding Electrodes Surface resistance robotics and automation manufacturing automation Computer aided manufacturing manufacturing processes

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Optomechanical dissipative solitons (vol 600, pg 75, 2021)

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NATURE 2022年第7896期602卷 E24-E24页

作者： Zhang, Jing Peng, Bo Kim, Seunghwi Monifi, Faraz Jiang, Xuefeng Li, Yihang Yu, Peng Liu, Lianqing Liu, Yu-xi Alu, Andrea Yang, Lan Department of Electrical and Systems Engineering Washington University St. Louis MO USA Department of Automation Tsinghua University Beijing P. R. China Photonics Initiative Advanced Science Research Center City University of New York New York NY USA Physics Program Graduate Center City University of New York New York NY USA State Key Laboratory of Robotics Shenyang Institute of Automation Chinese Academy of Sciences Shenyang P. R. China Institute of Microelectronics Tsinghua University Beijing P. R. China

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