Institution
Willow Garage
About: Willow Garage is a based out in . It is known for research contribution in the topics: Robot & Mobile robot. The organization has 76 authors who have published 191 publications receiving 28617 citations.
Topics: Robot, Mobile robot, Motion planning, Robotics, Personal robot
Papers
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06 Dec 2012TL;DR: This paper uses a system with position, force, and vision sensors to explore an environment geometry in two degrees offreedom to address some of the challenges that arise as model-mediated teleoperation is applied to systems with multiple degrees of freedom and multiple sensors.
Abstract: In this paper, we address some of the challenges that arise as model-mediated teleoperation is applied to systems with multiple degrees of freedom and multiple sensors. Specifically we use a system with position, force, and vision sensors to explore an environment geometry in two degrees of freedom. The inclusion of vision is proposed to alleviate the difficulties of estimating an increasing number of environment properties. Vision can furthermore increase the predictive nature of model-mediated teleoperation, by effectively predicting touch feedback before the slave is even in contact with the environment. We focus on the case of estimating the location and orientation of a local surface patch at the contact point between the slave and the environment. We describe the various information sources with their respective limitations and create a combined model estimator as part of a multi-d.o.f. model-mediated controller. An experiment demonstrates the feasibility and benefits of utilizing vision sensors in teleoperation.
27 citations
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03 May 2010TL;DR: A novel combination of motion planning techniques to compute motion plans for robotic arms that move the arm as close as possible to the goal region using sampling-based planning and then switch to a trajectory optimization technique for the last few centimeters necessary to reach the goal area.
Abstract: We present a novel combination of motion planning techniques to compute motion plans for robotic arms. We compute plans that move the arm as close as possible to the goal region using sampling-based planning and then switch to a trajectory optimization technique for the last few centimeters necessary to reach the goal region. This combination allows fast computation and safe execution of motion plans even when the goals are very close to objects in the environment. The system incorporates realtime sensory inputs and correctly deals with occlusions that can occur when robot body parts block the sensor view of the environment. The system is tested on a 7 degree-of-freedom robot arm with sensory input from a tilting laser scanner that provides 3D information about the environment.
26 citations
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TL;DR: This work shows that combined planning for constrained manipulation tasks can be dramatically accelerated by providing user demonstrations of the constrained manipulation motions, and shows how such demonstrations can be incorporated into a recently developed framework of planning with experience graphs which encode and reuse previous experiences.
Abstract: Motion planning in high dimensional state spaces, such as for mobile manipulation, is a challenging problem. Constrained manipulation, e.g., opening articulated objects like doors or drawers, is also hard since sampling states on the constrained manifold is expensive. Further, planning for such tasks requires a combination of planning in free space for reaching a desired grasp or contact location followed by planning for the constrained manipulation motion, often necessitating a slow two step process in traditional approaches. In this work, we show that combined planning for such tasks can be dramatically accelerated by providing user demonstrations of the constrained manipulation motions. In particular, we show how such demonstrations can be incorporated into a recently developed framework of planning with experience graphs which encode and reuse previous experiences. We focus on tasks involving articulation constraints, e.g., door opening or drawer opening, where the motion of the object itself involves only a single degree of freedom. We provide experimental results with the PR2 robot opening a variety of such articulated objects using our approach, using full-body manipulation (after receiving kinesthetic demonstrations). We also provide simulated results highlighting the benefits of our approach for constrained manipulation tasks.
26 citations
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28 Mar 2016TL;DR: In this article, an electromechanical mobile base is configured to be controllably movable upon a substantially planar surface in a global coordinate system, where a Z axis is defined perpendicular to the substantially planAR surface.
Abstract: One embodiment is directed to a personal robotic system, comprising: an electromechanical mobile base configured to be controllably movable upon a substantially planar surface in a global coordinate system wherein a Z axis is defined perpendicular to the substantially planar surface; a torso assembly movably coupled to the mobile base such that the torso may be controllably moved in a direction substantially parallel to the Z axis and also controllably rotated about an axis substantially perpendicular to the Z axis; a head assembly movably coupled to the torso assembly; a robotic arm operatively coupled to the torso assembly; and a controller operatively coupled to the mobile base, torso assembly, head assembly, and robotic arm, and configured to controllably manipulate nearby objects while also automatically minimizing destabilizing moments applied to the mobile base through movement of at least one of the mobile base, torso assembly, head assembly, and robotic arm.
25 citations
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08 Nov 2011TL;DR: This paper presents an architecture-agnostic design pattern for the coordination-related component interaction which provides an abstract coordination interface with high observability for the development of coordination and architecture and provides value to all stakeholders in the design and implementation of robot software systems.
Abstract: Robot software systems are (again) reaching levels of size and complexity that makes them difficult to construct, evolve, and maintain. One current issue is that systems are increasingly built to perform many different tasks in parallel, each of which must be coordinated and monitored to achieve a goal. If all components were to require different interfaces, system complexity would rapidly grow. General interfaces partially exist on the conceptual level, but their implementations are typically strongly linked to particular architectural proposals, thus reducing re-use and comparability. This paper presents an architecture-agnostic design pattern for the coordination-related component interaction. It results in a simple and clean component interface to invoke specific functionality, monitor task progress, and update the goals of running tasks. It provides an abstract coordination interface with high observability for the development of coordination and architecture. It thus provides value to all stakeholders in the design and implementation of robot software systems: component developers, coordination developers, and system architects. We trace the convergence of concepts and approaches from early coordination systems and through various abstraction proposals. Recently, two very similar realizations were developed independently by the authors. This paper presents the underlying insights and practical experience as a generic software engineering method which we named the Task-State-Pattern. We describe the functionality it provides to component developers and detail the technical steps necessary to implement it in a distributed event-based toolkit for specific application domains. We provide empirical evidence for the relevance and utility of our approach by presenting case studies and discussing how the proposed pattern leads to a flexible system structure with reduced integration effort.
25 citations
Authors
Showing all 76 results
Name | H-index | Papers | Citations |
---|---|---|---|
Ian Goodfellow | 85 | 137 | 135390 |
Kurt Konolige | 64 | 171 | 24749 |
Andreas Paepcke | 50 | 140 | 9405 |
Gunter Niemeyer | 47 | 153 | 17135 |
Radu Bogdan Rusu | 43 | 97 | 15008 |
Mike J. Dixon | 42 | 182 | 8272 |
Gary Bradski | 41 | 82 | 23763 |
Leila Takayama | 34 | 90 | 4549 |
Sachin Chitta | 34 | 56 | 4589 |
Wendy Ju | 34 | 184 | 3861 |
Maya Cakmak | 34 | 111 | 4452 |
Brian P. Gerkey | 32 | 51 | 7923 |
Caroline Pantofaru | 26 | 65 | 4116 |
Matei Ciocarlie | 25 | 91 | 3176 |
Kaijen Hsiao | 24 | 29 | 2366 |