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Title: Analysing the reliability of actuation elements in series and parallel configurations for high-redundancy actuation
Authors: Steffen, Thomas
Schiller, Frank
Blum, Michael
Dixon, Roger
Keywords: Redundancy
Mechanical actuation
Bionics
High-redundancy actuator (HRA)
Fault-tolerance
Multistate
Issue Date: 2012
Publisher: © Taylor and Francis
Citation: STEFFEN, T. ... et al., 2012. Analysing the reliability of actuation elements in series and parallel configurations for high-redundancy actuation. International Journal of Systems Science, iFirst, 18pp. [DOI:10.1080/00207721.2012.659694].
Abstract: A high-redundancy actuator (HRA) is an actuation system composed of a high number of actuation elements, increasing both travel and force above the capability of an individual element. This approach provides inherent fault tolerance: if one of the elements fails, the capabilities of the whole actuator may be reduced, but it retains core functionality. Many different configurations are possible, with different implications for the actuator capability and reliability. This article analyses the reliability of the HRA based on the likelihood of an unacceptable reduction in capability. The analysis of the HRA is a highly structured problem, but it does not fit into known reliability categories (such as the k-out-of-n system), and a fault-tree analysis becomes prohibitively large. Instead, a multi-state systems approach is pursued here, which provides an easy, concise and efficient reliability analysis of the HRA. The resulting probability distribution can be used to find the optimal configuration of an HRA for a given set of requirements.
Description: This article was published in the journal, International Journal of Systems Science [© Taylor & Francis] and the definitive version is available at: http://dx.doi.org/10.1080/00207721.2012.659694
Version: Accepted for publication
DOI: 10.1080/00207721.2012.659694
URI: https://dspace.lboro.ac.uk/2134/9444
Publisher Link: http://dx.doi.org/10.1080/00207721.2012.659694
Appears in Collections:Published Articles (Aeronautical and Automotive Engineering)

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