Overall availability and risk analysis of a general robot–safety device system

Abstract

We analyse the availability of a general robot-safety device system characterised by the feature of cold standby and by an admissible risky state. In contrast to the previous literature, we allow a general failure-free time distribution for the robot and, as an example, we present computational results for Coxian failure and repair time distributions. In order to decide whether the risky state is admissible, we introduce a risk criterion based on the notion of rare events. The criterion is always satisfied in the case of fast repair.

A functional equation related to a repairable system subjected to priority rules

“…upon failure of the robot, the safety device is shut-off and kept in cold standby until the repair of the robot has been completed, e.g. [24]. The involvement of cold standby redundancy in satellite systems has been cited by Kim et al [9].…”