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Analysing the reliability of actuation elements in series and parallel configurations for high-redundancy actuation

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journal contribution
posted on 07.03.2012 by Thomas Steffen, Frank Schiller, Michael Blum, Roger Dixon
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.

History

School

  • Aeronautical, Automotive, Chemical and Materials Engineering

Department

  • Aeronautical and Automotive Engineering

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].

Publisher

© Taylor and Francis

Version

AM (Accepted Manuscript)

Publication date

2012

Notes

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

Language

en

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