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A global approach to nonholonomic motion planning

A global approach to nonholonomic motion planning

引用

IEEE Conference on Decision and Control

作者： A.W. Divelbiss J. Wen New York State Center for Advanced Technology in Robotics and Automation 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. The authors present a new algorithm for constructing a feasible path between specified initial and final configurations. The algorithm iteratively warps the entire path until all the constraints are satisfied. Polyhedral constraints in both configuration and nonconfiguration spaces (possibly nonconvex) can also be incorporated in this framework. The algorithm is based on the assumption that the system is usually controllable about a nontrivial 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 of tractors with one, two, and three trailers are included to illustrate the efficacy of the proposed algorithm.< >

关键词： Iterative algorithms Control systems Kinematics Path planning Position control Nonlinear systems

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Fuzzy proximity measures for robot grasp planning

Fuzzy proximity measures for robot grasp planning

引用

IEEE International Symposium on Intelligent Control (ISIC)

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

Fast procedures for computing fuzzy proximity measures between a multifingered robot hand and an object to be grasped are presented. T.N. Nguyen and H.E. Stephanou (1990) presented a fuzzy approach for prehension, identified sources of fuzziness, and proposed a fuzzy algorithm for multifingered prehension. These ideas are extended by assuming fuzziness in the object location and geometric hand configuration, computing information on proximity of the hand and object, analyzing the computational efficiencies, and indicating how geometric information can be used in the process of prehension. The implementation details are outlined. The computation is useful in grasp planning and in analyzing the local behavior of the robot hand in the vicinity of the object.< >

关键词： Robots robotics and automation Solid modeling Paper technology Systems engineering and theory Fuzzy systems Electric variables measurement Fingers Kinematics End effectors

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A tactile sensing system for dexterous manipulation

A tactile sensing system for dexterous manipulation

引用

IEEE International Workshop on Intelligent Robots and Systems (IROS)

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

One factor that limits the range of tasks that robots can perform robustly is the scarcity of useful sensors available to provide feedback to the robot control system. While much progress has been made with vision sensors and force/torque sensors, tactile sensing systems have fallen behind, and so general-purpose tactile sensing systems are not commercially available. The aim of this work is therefore to produce a tactile sensing system that could be manufactured inexpensively, could be used on a wide variety of robotic systems, and would provide the kind of output typically required in dexterous manipulation applications. Such a tactile sensing system will be presented in this paper. The tactile transducers used in this system are based on semiconductive ink technology that allows transducers of any size, shape, and resistance range to be produced merely by altering the ink printing process and substrate geometry. Each sensor outputs three pieces of information that are useful in robotic manipulation-two parameters indicating the location of a contact point on the transducer and one parameter specifying the amount of force being exerted at the contact point. So that the sensing system could support transducers of different shapes and sizes, the analog interface circuitry of this system has been designed to be fully programmable, and also includes circuitry to enable self-calibration with appropriate software.< >

关键词： Transducers Robot sensing systems Sensor systems Tactile sensors Force sensors Ink Shape Circuits Robust control Feedback

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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

IEEE International Workshop on Intelligent Robots and Systems (IROS)

作者： S.S. Krishnan A.C. Sanderson New York State Center for Advanced Technology in Automation and Robotics and Electrical Computer and Systems Engineering Department Rensselaer Polytechnic Institute Troy NY USA

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Nonholonomic path planning with inequality constraints

Nonholonomic path planning with inequality constraints

引用

IEEE International Conference on robotics and automation (ICRA)

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

This paper presents an algorithm for finding a kinematically feasible path which satisfies a given set of nonholonomic constraints while enforcing both equality and inequality constraints on the configuration vector. The path planning problem is transformed from a finite time nonlinear control problem into a static root finding problem which is iteratively solved. By using an exterior penalty function method, the constrained root finding problem is converted to an unconstrained problem. Convergence of the algorithm depends upon a certain gradient operator being full rank. It has recently been shown that, in the absence of any configuration inequality constraints, the full rank condition is generic. In this paper, we show the full rank condition for a special inequality constraint case. An experiment in which the algorithm is applied to an actual double tractor-trailer vehicle is presented.< >

关键词： Path planning Control systems Controllability Motion control Velocity control Nonlinear control systems robotics and automation Systems engineering and theory Iterative algorithms Convergence

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Model-based multisensor data fusion: a minimal representation approach

Model-based multisensor data fusion: a minimal representatio...

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IEEE International Conference on robotics and automation (ICRA)

作者： R. Joshi A.C. Sanderson New York State Center for Advanced Technology in Automation and Robotics Electrical Computer and Systems Engineering Department Rensselaer Polytechnic Institute Troy NY USA

A general approach to model-based multisensor data fusion using a minimal representation size criterion is described. Each sensor is modeled by a general constraint equation which defines a data constraint manifold (DCM), and observed sensor data populate the measurement space according to these constraints. The choice of multisensor interpretations is based on a minimal representation size criterion which evaluates the complexity through correspondence and encoded errors weighted by relative sensor accuracy and precision. This general framework automatically selects subsets of data features called constraining data feature sets (CDFS) and chooses the CDFS corresponding to a minimal representation interpretation of the observed data. The resulting procedure fuses heterogeneous sensor readings into a single estimation method. The method is illustrated for a visual and tactile data fusion example. The approach generalizes to problems with non-geometric models, and can be used for multisensor system identification in other domains such as process control.< >

关键词： robotics and automation Sensor fusion Robot sensing systems Sensor systems Probability distribution Data engineering Systems engineering and theory Equations Manifolds Fuses

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Finding a sequence of sensor operations for volumetric inspection

Finding a sequence of sensor operations for volumetric inspe...

引用

IEEE International Conference on Systems, Man and Cybernetics

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

A system for exhaustively inspecting a workpiece, not merely certain features, is presented. The system is 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 boundary-based inspection methods. The method is capable of handling arbitrarily complex geometries and does not rely on the identification of features. It lends itself naturally to a multisensor environment, and facilitates true 3-D inspection as opposed to methods that require dimensional reductions of data by projection onto a 2-D plane. The authors focus on an important aspect of volumetric inspection which is the automatic generation of a sequence of sensor operations that will acquire the complete geometry of the object being inspected.< >

关键词： Inspection Geometry robotics and automation Casting Space technology Sensor systems Solid modeling Systems engineering and theory Sensor phenomena and characterization Production

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Variably-autonomous manipulation

Variably-autonomous manipulation

引用

IEEE International Conference on robotics and automation (ICRA)

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

There are numerous applications in which robots are needed to assist rather than replace human operators. These applications typically involve either work in a dangerous environment or performing tasks that are physically impossible for humans to accomplish by themselves. Robots used in this mode do not need to be autonomous because they can essentially be controlled by the operator. Nonetheless, it is difficult for an operator to flawlessly control a robot with a large number of degrees of freedom. Therefore, an intelligent control system is needed to correct and improve the operator's input to the robot. In this paper the authors discuss a central component in this control system known as the variably-autonomous trajectory generator (VATG). The VATG combines input from the operator with input from one or more autonomous control modules (CM) to generate the robot trajectory. The amount of impact the autonomous CMs will have on the overall trajectory will depend on a number of factors such as the task being performed and the sensing modalities available, hence the authors refer to this type of control as being variably-autonomous.< >

关键词： Robot sensing systems robotics and automation Humans Control systems Application software Wrist Tactile sensors Force sensors Grasping Systems engineering and theory

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An Information Theoretic Approach To Approximate Reasoning

An Information Theoretic Approach To Approximate Reasoning

引用

IEEE International Workshop on Intelligent Robots and Systems (IROS)

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

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Registration of dissimilar featureless models for inspection

Registration of dissimilar featureless models for inspection

引用

IEEE International Conference on robotics and automation (ICRA)

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

General-purpose CAD-based inspection of a manufactured workpiece often involves comparing a part model created using intensity or range images of the part to a toleranced reference model of the part. Before this comparison can be made, however, the sensed object model must be registered to the reference object model. Most registration approaches assume that it is possible to identify and match features in the models and that the object models represent very similar geometries. A registration approach that deals with featureless dissimilar models is presented, and experimental results are demonstrated. Although the need for such an approach was motivated by needs in inspection, the approach is very general and can be used in a variety of other applications.< >

关键词： Inspection Casting robotics and automation Solid modeling Data structures Systems engineering and theory Geometry Valves Manufacturing processes Surface morphology

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