31 research outputs found

    Tactile Sensing for Assistive Robotics

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    Combining Perception and Knowledge for Service Robotics

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    As the deployment of robots is shifting away from the industrial settings towards public and private sectors, the robots will have to get equipped with enough knowl- edge that will let them perceive, comprehend and act skillfully in their new work- ing environments. Unlike having a large degree of controlled environment variables characteristic for e.g. assembly lines, the robots active in shopping stores, museums or households will have to perform open-ended tasks and thus react to unforeseen events, self-monitor their activities, detect failures, recover from them and also learn and continuously update their knowledge. In this thesis we present a set of tools and algorithms for acquisition, interpreta- tion and reasoning about the environment models which enable the robots to act flexibly and skillfully in the afore mentioned environments. In particular our contri- butions beyond the state-of-the-art cover following four topics: a) semantic object maps which are the symbolic representations of indoor environments that robot can query for information, b) two algorithms for interactive segmentation of objects of daily use which enable the robots to recognise and grasp objects more robustly, c) an image point feature-based system for large scale object recognition, and finally, d) a system that combines statistical and logical knowledge for household domains and is able to answer queries such as Which objects are currently missing on a breakfast table? . Common to all contributions is that they are all knowledge-enabled in that they either use robot knowledge bases or ground knowledge structures into the robot s internal structures such as perception streams. Further, in all four cases we exploit the tight interplay between the robot s perceptual, reasoning and action skills which we believe is the key enabler for robots to act in unstructured environments. Most of the theoretical contributions of this thesis have also been implemented on TUM-James and TUM-Rosie robots and demonstrated to the spectators by having them perform various household chores. With those demonstrations we thoroughly validated the properties of the developed systems and showed the impossibility of having such tasks implemented without a knowledge-enabled backbone

    Robot manipulation in human environments

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    Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Electrical Engineering and Computer Science, 2007.Includes bibliographical references (p. 211-228).Human environments present special challenges for robot manipulation. They are often dynamic, difficult to predict, and beyond the control of a robot engineer. Fortunately, many characteristics of these settings can be used to a robot's advantage. Human environments are typically populated by people, and a robot can rely on the guidance and assistance of a human collaborator. Everyday objects exhibit common, task-relevant features that reduce the cognitive load required for the object's use. Many tasks can be achieved through the detection and control of these sparse perceptual features. And finally, a robot is more than a passive observer of the world. It can use its body to reduce its perceptual uncertainty about the world. In this thesis we present advances in robot manipulation that address the unique challenges of human environments. We describe the design of a humanoid robot named Domo, develop methods that allow Domo to assist a person in everyday tasks, and discuss general strategies for building robots that work alongside people in their homes and workplaces.by Aaron Ladd Edsinger.Ph.D

    Toward Effective Physical Human-Robot Interaction

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    With the fast advancement of technology, in recent years, robotics technology has significantly matured and produced robots that are able to operate in unstructured environments such as domestic environments, offices, hospitals and other human-inhabited locations. In this context, the interaction and cooperation between humans and robots has become an important and challenging aspect of robot development. Among the various kinds of possible interactions, in this Ph.D. thesis I am particularly interested in physical human-robot interaction (pHRI). In order to study how a robot can successfully engage in physical interaction with people and which factors are crucial during this kind of interaction, I investigated how humans and robots can hand over objects to each other. To study this specific interactive task I developed two robotic prototypes and conducted human-robot user studies. Although various aspects of human-robot handovers have been deeply investigated in the state of the art, during my studies I focused on three issues that have been rarely investigated so far: Human presence and motion analysis during the interaction in order to infer non-verbal communication cues and to synchronize the robot actions with the human motion; Development and evaluation of human-aware pro-active robot behaviors that enable robots to behave actively in the proximity of the human body in order to negotiate the handover location and to perform the transfer of the object; Consideration of objects grasp affordances during the handover in order to make the interaction more comfortable for the human
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