When a redundant manipulator suffers a joint failure, its dexterity will be significantly affected. A joint failure may result in a singular configuration even if the manipulator operates in a relatively dexterous configuration, as a result, the manipulator can't perform arbitrary end effector motions. Fault-tolerance of redundant manipulator is examined in this work. Considering the condition that one joint is failed, manipulability is explored to evaluate the fault-tolerant property and new measure is proposed. This measure is characterized by little computation and can be implemented online. Finally, simulation result illustrates the validity of the proposed measure.
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