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Repairable Systems and Availability

  • Massimo Lazzaroni
  • Loredana Cristaldi
  • Lorenzo Peretto
  • Paola Rinaldi
  • Marcantonio Catelani
Chapter

Abstract

In Chapter six the concepts of Availability will be explained and discussed. The Availability is a concept that refers to reparable systems. For such systems the time of operation is not continuous, since their operating life cycles are described by a sequence of up and down states. Therefore the system operates until it fails, then it will be repaired and so it returns to its original functioning state. It will fail again after some random time of operation, get repaired again, and this process of both failure and repair will reiterate; hence the state of the system alternates between a operating state and a repair state. In this case, the important variables to be determined are the times to failure and the times to repair. Availability is defined as “the aptitude of the element to perform its required function in given conditions up to a given point in time or during a given time interval assuming that any eventual external resource is assured.” The availability of a machine can also be defined as the percentage of time, in respect to total time, in which the machine is required to function.

Keywords

Repairable System Preventive Maintenance Correct Functioning Maintenance Time Corrective Maintenance 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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References

  1. 1.
    IEC 60050-191, International Electrotechnical Vocabulary 1.0 edn. ch. 191: Dependability and quality of service, December 31 (1990); Forecast publication date for 2.0 edn. IEC International Electrotechincal Commission, Geneve, June 2 (2012)Google Scholar

Copyright information

© Springer-Verlag Berlin Heidelberg 2011

Authors and Affiliations

  • Massimo Lazzaroni
    • Loredana Cristaldi
      • Lorenzo Peretto
        • Paola Rinaldi
          • Marcantonio Catelani

            There are no affiliations available

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