Increasing the reliability of high redundancy actuators by using elements in series and parallel

Research output: Chapter in Book/Report/Conference proceedingConference contribution


Colleges, School and Institutes

External organisations

  • Loughborough University
  • Technical University Munich


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.


Original languageEnglish
Title of host publicationComputer Safety, Reliability, and Security - 28th International Conference, SAFECOMP 2009, Proceedings
Publication statusPublished - 4 Nov 2009
Event28th International Conference on Computer Safety, Reliability, and Security, SAFECOMP 2009 - Hamburg, Germany
Duration: 15 Sep 200918 Sep 2009

Publication series

NameLecture Notes in Computer Science (including subseries Lecture Notes in Artificial Intelligence and Lecture Notes in Bioinformatics)
Volume5775 LNCS
ISSN (Print)0302-9743
ISSN (Electronic)1611-3349


Conference28th International Conference on Computer Safety, Reliability, and Security, SAFECOMP 2009


  • Dependable systems, Failure probability, Fault mode and effect analysis (FMEA), Fault-tolerance, High redundancy actuator (HRA), K-out-of-n:G system, Multi-state system