Building safer robots: Safety driven control

Woodman, R., Winfield, A. F., Harper, C. and Fraser, M. (2012) Building safer robots: Safety driven control. International Journal of Robotics Research, 31 (13). pp. 1603-1626. ISSN 0278-3649

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Publisher's URL: http://dx.doi.org/10.1177/0278364912459665

Abstract

In recent years there has been a concerted effort to address many of the safety issues associated with physical human–robot interaction (pHRI). However, a number of challenges remain. For personal robots, and those intended to operate in unstructured environments, the problem of safety is compounded. In this paper we argue that traditional system design techniques fail to capture the complexities associated with dynamic environments. We present an overview of our safety-driven control system and its implementation methodology. The methodology builds on traditional functional hazard analysis, with the addition of processes aimed at improving the safety of autonomous personal robots. This will be achieved with the use of a safety system developed during the hazard analysis stage. This safety system, called the safety protection system, will initially be used to verify that safety constraints, identified during hazard analysis, have been implemented appropriately. Subsequently it will serve as a high-level safety enforcer, by governing the actions of the robot and preventing the control layer from performing unsafe operations. To demonstrate the effectiveness of the design, a series of experiments have been conducted using a MobileRobots PeopleBot. Finally, results are presented demonstrating how faults injected into a controller can be consistently identified and handled by the safety protection system.

Item Type:Article
Additional Information:Roger Woodman can be contacted at roger.woodman@brl.ac.uk
Uncontrolled Keywords:robot safety, hazard analysis, safety protection system, safety-driven control
ID Code:17435
Deposited By: Professor A. Winfield
Deposited On:01 Oct 2012 10:26
Last Modified:14 Aug 2013 09:17

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