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Proceedings Paper

Task Decomposition Module For Telerobot Trajectory Generation
Author(s): Albert J. Wavering; Ron Lumia
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Paper Abstract

A major consideration in the design of trajectory generation software for a Flight Telerobotic Servicer (FTS) is that the FTS will be called upon to perform tasks which require a diverse range of manipulator behaviors and capabilities. In a hierarchical control system where tasks are decomposed into simpler and simpler subtasks, the task decomposition module which performs trajectory planning and execution should therefore be able to accommodate a wide range of algorithms. In some cases, it will be desirable to plan a trajectory for an entire motion before manipulator motion commences, as when optimizing over the entire trajectory. Many FTS motions, however, will be highly sensory-interactive, such as moving to attain a desired position relative to a non-stationary object whose position is periodically updated by a vision system. In this case, the time-varying nature of the trajectory may be handled either by frequent replanning using updated sensor information, or by using an algorithm which creates a less specific state-dependent plan that determines the manipulator path as the trajectory is executed (rather than a priori). This paper discusses a number of trajectory generation techniques from these categories and how they may be implemented in a task decompo-sition module of a hierarchical control system. The structure, function, and interfaces of the proposed trajectory gener-ation module are briefly described, followed by several examples of how different algorithms may be performed by the module. The proposed task decomposition module provides a logical structure for trajectory planning and execution, and supports a large number of published trajectory generation techniques.

Paper Details

Date Published: 27 October 1988
PDF: 8 pages
Proc. SPIE 1006, Space Station Automation IV, (27 October 1988); doi: 10.1117/12.949059
Show Author Affiliations
Albert J. Wavering, National Institute of Standards and Technology (United States)
Ron Lumia, National Institute of Standards and Technology (United States)

Published in SPIE Proceedings Vol. 1006:
Space Station Automation IV
Wun C. Chiou, Editor(s)

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