Comparing performance level estimation of safety functions in three distributed structures

Marita Hietikko, Timo Malm, H. Saha

    Research output: Contribution to journalArticleScientificpeer-review

    2 Citations (Scopus)

    Abstract

    The capability of a machine control system to perform a safety function is expressed using performance levels (PL). This paper presents the results of a study where PL estimation was carried out for a safety function implemented using three different distributed control system structures. Challenges relating to the process of estimating PLs for safety related distributed machine control functions are highlighted. One of these examines the use of different cabling schemes in the implementation of a safety function and its effect on the PL evaluation. The safety function used as a generic example in PL calculations relates to a mobile work machine. It is a safety stop function where different technologies (electrical, hydraulic and pneumatic) can be utilized. It was detected that by replacing analogue cables with digital communication the system structure becomes simpler with less number of failing components, which can better the PL of the safety function.
    Original languageEnglish
    Pages (from-to)218 - 229
    JournalReliability Engineering and System Safety
    Volume134
    DOIs
    Publication statusPublished - 2015
    MoE publication typeA1 Journal article-refereed

    Fingerprint

    Distributed parameter control systems
    Pneumatics
    Cables
    Hydraulics
    Control systems
    Communication

    Keywords

    • machines
    • distributed control system
    • safety
    • risk analysis
    • CANopen

    Cite this

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    title = "Comparing performance level estimation of safety functions in three distributed structures",
    abstract = "The capability of a machine control system to perform a safety function is expressed using performance levels (PL). This paper presents the results of a study where PL estimation was carried out for a safety function implemented using three different distributed control system structures. Challenges relating to the process of estimating PLs for safety related distributed machine control functions are highlighted. One of these examines the use of different cabling schemes in the implementation of a safety function and its effect on the PL evaluation. The safety function used as a generic example in PL calculations relates to a mobile work machine. It is a safety stop function where different technologies (electrical, hydraulic and pneumatic) can be utilized. It was detected that by replacing analogue cables with digital communication the system structure becomes simpler with less number of failing components, which can better the PL of the safety function.",
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    Comparing performance level estimation of safety functions in three distributed structures. / Hietikko, Marita; Malm, Timo; Saha, H.

    In: Reliability Engineering and System Safety, Vol. 134, 2015, p. 218 - 229.

    Research output: Contribution to journalArticleScientificpeer-review

    TY - JOUR

    T1 - Comparing performance level estimation of safety functions in three distributed structures

    AU - Hietikko, Marita

    AU - Malm, Timo

    AU - Saha, H.

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    AB - The capability of a machine control system to perform a safety function is expressed using performance levels (PL). This paper presents the results of a study where PL estimation was carried out for a safety function implemented using three different distributed control system structures. Challenges relating to the process of estimating PLs for safety related distributed machine control functions are highlighted. One of these examines the use of different cabling schemes in the implementation of a safety function and its effect on the PL evaluation. The safety function used as a generic example in PL calculations relates to a mobile work machine. It is a safety stop function where different technologies (electrical, hydraulic and pneumatic) can be utilized. It was detected that by replacing analogue cables with digital communication the system structure becomes simpler with less number of failing components, which can better the PL of the safety function.

    KW - machines

    KW - distributed control system

    KW - safety

    KW - risk analysis

    KW - CANopen

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