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Title: Increasing reliability by means of efficient configurations for high redundancy actuators
Authors: Steffen, Thomas
Schiller, Frank
Blum, Michael
Dixon, Roger
Keywords: High redundancy actuator (HRA)
Fault mode and effect analysis (FMEA)
Multi-state system
k-out-of-n:G system
Failure probability
Dependable systems
Issue Date: 2009
Publisher: © IFAC
Citation: STEFFEN, T. ... et al, 2009. Increasing reliability by means of efficient configurations for high redundancy actuators. IN: Proceedings of 7th IFAC Symposium on Fault Detection, Supervision and Safety of Technical Processes. SafeProcess 2009, Barcelona, Spain, 30 June - 3 July 2009.
Abstract: A high redundancy actuator (HRA) is composed of a high number of actuation elements, increasing both the travel and the force above the capability of an individual element. This provides inherent fault tolerance: if one of the elements fails, the capabilities of the actuator may be reduced, but it does not become dysfunctional. This paper analyses the likelihood of reductions in capabilities. The actuator is considered as a multi-state system, and the approach for k-out-of-n:G systems can be extended to cover the case of the HRA. The result is a probability distribution that quantifies the capability of the HRA. By comparing the distribution for different configurations, it is possible to identify the optimal configuration of an HRA for a given situation.
Description: This is a conference paper, it was presented at SafeProcess 2009 [© IFAC]. The definitive version will be available at: http://www.ifac-papersonline.net/
Version: Accepted for publication
URI: https://dspace.lboro.ac.uk/2134/4976
Appears in Collections:Conference Papers and Presentations (Mechanical, Electrical and Manufacturing Engineering)

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