System reliability analysis of interactions between ETCS, train drivers and dispatchers, demonstrated by STPA
2022
Hochschulschrift
Zugriff:
The Dutch railway transport system is a system of systems and also a sociotechnical system that will migrate to a radio-based signalling standard ERTMS (European Rail Traffic Management System). ERTMS will influence the train drivers and dispatchers the most, especially due to the introduction of the signalling and control element of ERTMS: the European train control system (ETCS). A reliability requirement for the migration towards ERTMS obligates to demonstrate that the reliability of the system stays the same or improves. Reliability can be quantified if all the possible risks are known, but identifying risks with traditional models is insufficient, because they do not capture the complexities and dynamics of socio-technical systems. The hazard analysis technique ‘systems theoretic process analysis’ (STPA) is a promising technique to sufficiently identify hazards that models the system in a control structure and searches systematically for hazards. The main research question of this thesis is: ‘To what extent can STPA be applied to identify risks and determine the system reliability of interactions between ETCS, train drivers and dispatchers?’ What are the risks caused by those interactions and how can STPA be applied for an effective risk assessment are the two research objectives. STPA consists of 4 structured steps. First the analysed system is described and the purpose of the analysis is set. The system is modelled in a control structure in the second step. The third step of STPA is to identify unsafe control actions with guided words. 27 unsafe control actions are identified for the 8 control actions that are present in the control structure. The last step of STPA is to identify loss scenarios that could lead to the unsafe control actions, those were formulated with system experts. The desk research and this research demonstrates that STPA is completer and more thorough in identifying hazards than the tradition hazard analysis technique ‘failure mode effect and criticality analysis’ (FMECA). In this .
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System reliability analysis of interactions between ETCS, train drivers and dispatchers, demonstrated by STPA
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Autor/in / Beteiligte Person: | Aantjes, Julian ; van Gelder, P.H.A.J.M. (mentor) ; Goverde, R.M.P. (graduation committee) ; Mennen, W.M.T. (graduation committee) ; Verduijn, G.M. (graduation committee) ; Delft University of Technology (degree granting institution) |
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Veröffentlichung: | 2022 |
Medientyp: | Hochschulschrift |
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