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Risk estimation studies in the context of a machine control function

Author

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  • Hietikko, Marita
  • Malm, Timo
  • Alanen, Jarmo

Abstract

Nowadays the safety requirements of a machine are increasingly associated with programmable electronic control systems. Risk estimation is an essential part of risk analysis in a machine development process, because the categorisation and allocation of safety requirements is based on this. It is important to know how the risk estimation is performed, since wrong safety integrity level (SIL) or performance level (PL) selection may lead to multiple costs of the safety-related part of the control system. On the other hand, wrong PL or SIL selection can weaken the safety of the system. In this article, a risk estimation process of a safety-related control function is presented. Different groups carried out three case studies including risk estimation for the same safety-related control function of a machine. The results of the risk estimations of the groups differ from each other. The possible reasons for the variations are discussed.

Suggested Citation

  • Hietikko, Marita & Malm, Timo & Alanen, Jarmo, 2011. "Risk estimation studies in the context of a machine control function," Reliability Engineering and System Safety, Elsevier, vol. 96(7), pages 767-774.
    • Handle: RePEc:eee:reensy:v:96:y:2011:i:7:p:767-774
    DOI: 10.1016/j.ress.2011.02.009
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    References listed on IDEAS

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    1. Aven, Terje & Heide, Bjørnar, 2009. "Reliability and validity of risk analysis," Reliability Engineering and System Safety, Elsevier, vol. 94(11), pages 1862-1868.
    2. Aven, Terje, 2010. "On how to define, understand and describe risk," Reliability Engineering and System Safety, Elsevier, vol. 95(6), pages 623-631.
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    Cited by:

    1. Jocelyn, Sabrina & Baudoin, James & Chinniah, Yuvin & Charpentier, Philippe, 2014. "Feasibility study and uncertainties in the validation of an existing safety-related control circuit with the ISO 13849-1:2006 design standard," Reliability Engineering and System Safety, Elsevier, vol. 121(C), pages 104-112.
    2. Hietikko, Marita & Malm, Timo & Saha, Heikki, 2015. "Comparing performance level estimation of safety functions in three distributed structures," Reliability Engineering and System Safety, Elsevier, vol. 134(C), pages 218-229.
    3. Porras-Vázquez, Alberto & Romero-Pérez, Julio-Ariel, 2018. "A new methodology for facilitating the design of safety-related parts of control systems in machines according to ISO 13849:2006 standard," Reliability Engineering and System Safety, Elsevier, vol. 174(C), pages 60-70.

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