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Task planning and project management using Petri nets

Task planning and project management using Petri nets

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IEEE International Symposium on Assembly and Manufacturing (ISAM)

作者： Jongwook Kim A.A. Desrochers A.C. Sanderson Center for Advanced Technology in Automation and Robotics and Department of Electrical Computer and Systems Engineering Rensselaer Polytechnic Institute Troy NY USA

The demand for effective project management increases as the complexity and cost of a project grown. This paper introduces an interactive project management approach based on the Petri net to overcome the limitations of network diagrams. In the Petri net based approach, the project manager does fine tuning of the planning and scheduling with the resource constraints embedded in the plan representation. The Petri net controller maintains three plan representations. The reference, monitor and predictor Petri nets. These three nets are configured with the resource database to form a feedback loop such that the controller can monitor and control the project online. This structure is applicable to the control of more general discrete event dynamic systems as well as the project management problem. In case no admissible control action can be found, the manager turns to the rescheduling/replanning mode to generate a new plan and schedule.

关键词： Project management Petri nets Monitoring robotics and automation Costs Resource management Building materials Scheduling Visualization Roads

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Robot motion planning for sensor-based control with uncertainties

Robot motion planning for sensor-based control with uncertai...

引用

IEEE International Conference on robotics and automation (ICRA)

作者： L.A. Page A.C. Sanderson Center for Advanced Technology in Automation Robotics and Manufacturing Department of Electrical Computer and Systems Engineering Rensselaer Polytechnic Institute Troy NY USA

This paper describes a new representation for sensing and control uncertainties in sensor-based robot control, and presents motion planning algorithms that use this representation. The planning algorithms employ a robot's sensing capabilities as needed to accomplish a task, by activating sensors at points or intervals during motion. A sensor is represented by three quantities: a domain, which is the set of robot configurations at which a valid measurement can be taken; an absolute sensing uncertainty held, which describes the sensor's absolute (global) accuracy; and an incremental motion uncertainty, which describes the sensor's relative (pertaining to displacements) accuracy. Control uncertainty represents the ability of a controller to drive the measured error near zero. These descriptions of sensing and control capability determine the evolution of uncertainty in a sensor-based motion plan. Two complementary algorithms for motion planning with the new representation are presented. One is a backprojection algorithm which searches globally (in configuration space and the available sensors) for ways to achieve a particular subgoal. The other searches locally (in path space) to satisfy all the constraints in a planning problem. Examples of uncertainty evaluation and motion planning in two degrees of freedom are presented.

关键词： Robot motion Motion planning Motion control Uncertainty Robot sensing systems Robot control Sensor phenomena and characterization Displacement measurement Motion measurement Error correction

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Task-based servoing in quaternion space

Task-based servoing in quaternion space

引用

IEEE International Conference on robotics and automation (ICRA)

作者： L. Singh H. Stephanou New York State Center for Advanced Technology in Robotics Automation and Manufacturing and Department of Electrical Computer and Systems Engineering Rensselaer Polytechnic Institute Troy NY USA

This paper introduces and analyzes a method based on vector-quaternion pairs for accomplishing task-based control. The optimal control paradigm has been extended into quaternion space with a complete definition of the control law required to control a plant in such a space. A complete set of derivations of the quaternion algebra used to accomplish the optimal control have also been developed. The advantage of this approach is that it decouples the position and orientation states, thereby reducing the complexity of the control algorithms. The intended application of this research is task-level control of the five-fingered Anthrobot mounted on a PUMA 760.

关键词： Quaternions Optimal control Space technology Orbital robotics Force control robotics and automation Manufacturing automation Computer aided manufacturing Motion control Acceleration

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Synthesized passive feedback control of sensor-rich smart structures-experimental results

Synthesized passive feedback control of sensor-rich smart st...

引用

IEEE Conference on Control technology and Applications (CCTA)

作者： P. Akella J.T. Wen Control Laboratory for Mechanical Structures Department of Electrical Computer and Systems EngineeringCenter for Advanced Technology in Automation Robotics & Manufacturing Rensselaer Polytechnic Institute RPI Troy NY USA

Passivity based controllers are used in structural control due to their inherent robustness properties. These controllers require sensor/actuator collocation. In this paper, we consider the design of a "squaring down" matrix which renders a system passive by using a linear combination of all collocated and non-collocated sensor/actuator pairs. The design uses experimental transfer functions and does not require the knowledge of the system model. The problem of finding the squaring down matrix is cast as a solution to a set of linear matrix inequalities (LMIs) subject to some additional performance considerations. The design procedure of the squaring down matrix assumes that velocity information is available from the sensors which is not generally the case. We show that the squaring down matrix can be implemented without the use of such velocity information. We provide experimental results gathered from the single link flexible beam setup in the C/sub La/MS laboratory at RPI to show that implementation of passive loops without velocity measurements provides very good results.

关键词： Feedback control Linear matrix inequalities Intelligent sensors Control system synthesis Robust control Sensor systems Hydraulic actuators Transfer functions Laboratories Economic indicators

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Preisach modeling of piezoceramic and shape memory alloy hysteresis

Preisach modeling of piezoceramic and shape memory alloy hys...

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IEEE Conference on Control technology and Applications (CCTA)

作者： D. Hughes J.T. Wen Control Laboratory for Mechanical Structures (CLaMS) Center for Advanced Technology in Automation Robotics & Manufacturing Department of Electrical Computer and Systems Engineering Rensselaer Polytechnic Institute Troy NY USA

Smart materials such as piezoceramics and shape memory alloys (SMAs) exhibit significant hysteresis and in order to estimate the effect on open and closed loop control a suitable model is needed. One promising candidate is the Preisach independent domain hysteresis model that is characterized by the congruent minor loop and wiping out properties. Comparable minor loop and decaying oscillation test data for a multi-sheet piezoceramic actuator (made of lead zirconate titanate) attached to a flexible beam are presented and are seen to be very consistent with the two Preisach model properties. The commanded parameter is the sheet transverse electric field while the measured parameter is an approximately colocated strain induced in the beam. Equivalent data for a Nitinol SMA wire muscle, attached to the same beam, are also presented. The input and output parameters are the SMA current and a beam strain respectfully. The minor loop and wiping out evidence is less strong than that of the piezoceramic case, but encouraging. In all experiments the quasi-steady state responses were generated in order to avoid exciting beam flexible modes which would complicate the analysis.

关键词： Piezoelectric materials Shape memory alloys Hysteresis Strain measurement Shape control Open loop systems Testing Actuators Titanium compounds Electric variables measurement

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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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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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Attitude control without angular velocity measurement: a passivity approach

Attitude control without angular velocity measurement: a pas...

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IEEE International Conference on robotics and automation (ICRA)

作者： F. Lizarralde J.T. Wen Department of Electrical Engineering COPPE UFRJ Rio de Janeiro Brazil Center for Advanced Technology in Automation and Robotics Department of Electrical Computer and Systems Engineering Rensselaer Polytechnic Institute Troy NY USA

It is well known that the linear feedback of the quarternion of the attitude error and angular velocity globally stabilizes the attitude of a rigid body. In this note, we show that the angular velocity feedback can be replaced by a nonlinear filter of the quarternion, thus removing the need of direct angular velocity measurement. In contrast to other approaches, this design exploits the inherent passivity of the system; a dynamic observer reconstructing the velocity is not needed. An application of the proposed scheme is illustrated for the robot control problem. Simulation results are included to illustrate the theoretical results.

关键词： Angular velocity Velocity measurement PD control Feedback Quaternions Robot control Orbital robotics robotics and automation Space vehicles Proportional control

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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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Unified telerobotic architecture project program overview

Unified telerobotic architecture project program overview

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IEEE International Workshop on Intelligent Robots and Systems (IROS)

作者： M.B. Leahy S.B. Petroski AFMC Robotics and Automation Center of Excellence Technology Industrial Support Directorate Specialized Engineering Branch Advanced Process Technology Section San Antonio Air Logistics Center TX USA AFMC Robotics and Automation Center of Excellence Technology and Industrial Support Directorate Specialized Engineering Branch Advanced Process Technology Section San Antonio Air Logistics Center TX USA

The time is right to transition telerobotics beyond the traditional hazardous environment domain into industrial repair and remanufacturing applications. Air Force depots are prime examples of an industrial environment where small batch sizes, feature uncertainty, and varying workload conspire to make classical industrial robotic solutions impractical and telerobotics a key enabling technology. The United States Air Force, Air Force Material Command, robotics and automation center of Excellence (RACE) has launched the Unified Telerobotics Architecture Project (UTAP) to champion the development of the support infrastructure necessary to foster creative development and innovative utilization of emerging telerobotic technologies for depot applications. The UTAP program is the focus of this paper.< >

关键词： Telerobotics Industrial control

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