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    Robotics Reliability

    → Europe/Zurich
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    SES

    • We have given the MTBF for the RMIS, not the SES. No RMIS tasks have yet been proposed so nothing implemented yet.
    • SES is in the baseline simulation already, but simulating only the response to the fire alarms.
    • This task only has 120 hours of task operation over the lifetime.
    • Therefore if the RMIS estimates of 750 hours, is a very high value.
    • It is difficult to use the SES case for ARW because the system is safety critical, and therefore the sensitivity of the availability is less relevant, and the results are less useful because the SES SHOULD be extremely reliable.

    Alcoves

    • The PC task has been modelled already, but it currently doesn't account for the remote fixes (This wasn't clear)
    • It also doesn't account for any robot reliability or failures.
    • The concept is not defined, and there will be some safety tasks in the Alcove.
    • For now, best not to assume the robot will be safety critical.
    • There are also other tasks, which the robot needs to be performing, which would account for operational time.
      • These should be estimated and the ratio between PC and non-PC tasks taken into account for MTBF.
    • There is also non-operational time. This should also be accounted for. (185 days per year of operation)
    • Infrastructure failures are also a potential concern. However, these are likely to be safety critical infrastructure, and so can be assumed to be reliable enough to not impact significantly.
    • Redundancy of the system and the potential that the task requires human-intervention should also be accounted for in the state diagram.

    Proposal to move forwards for ARW

    • Jorge to estimate MTBF for alcove concept from suppliers, i.e KUKA (Morgan), Boston Dynamics (Francesco) for similar robots.
    • Morgan to estimate task time ratios for alcove concepts and produce a compensated MTBF.
      • Morgan to provide the compensated MTBF (Friday 25th Sept).
    • Jack / Johanna to request an estimate of % of failures that require human intervention regardless of robot reliability.
    • FCC Availability Study to run sensitivity analysis on these metrics for the PC task in the alcove and provide back the results.
    • Hannes to work on presentation for ARW in November.
    • Jack / Johanna to send slides from PhD presentation on cost per beam time if relevant.

     

    AOB

    • Morgan asked about the "CHF per luminosity" or beam time.
      • No detailed figure, but a PhD is working on this topic and presenting today (17th Sept)
      • Basic estimates from CAPEX and OPEX targets / operational time is the best case estimate for now.

     

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