System dynamics modeling for multi-state systems

Hadi Akbarzadeh Khorshidi, Indra Gunawan, Mahrous Yousef Ibrahim

Research output: Chapter in Book/Report/Conference proceedingConference PaperResearchpeer-review

2 Citations (Scopus)


In this paper, the dynamic behavior of the system reliability is modeled by system dynamics approach. Since the reliability levels of the components and systems changes during functioning periods, this variability should be considered in reliability assessment. System dynamics has been used to
simulate the dynamic interactions of the phenomena in different areas such as economics, environment, social, humanity, management, and engineering. In system dynamics, Causal Loop Diagrams (CLDs) and stock and flow structures are employed to both represent the elements and model their interactions in
order to predict the future status of the system. Due to the capability of the system dynamics in capturing the dynamic behavior of complex systems, it is used for a dynamic assessment of system reliability. The components in this system are multi-state so that they have more performance levels than failure
and working states. A case of a multi-state weighted k-out-of-n system is simulated in this study. Software iThink is used to develop the dynamic model for the case study. The results of the system dynamics approach are compared with the outputs of the dynamic availability assessment by mathematical modeling. In addition, the associated cost of maintenance activities is added in the model. Therefore, different scenarios can be evaluated in terms of cost and reliability with the intention of finding optimal decisions. Finally, a sensitivity analysis has been conducted under various conditions in the simulation model.
Original languageEnglish
Title of host publicationSafety and Reliability of Complex Engineered Systems
EditorsLuca Podofillini, Bruno Sudret, Bozidar Stojadinovic, Enrico Zio, Wolfgang Kroger
Place of PublicationLondon UK
PublisherTaylor & Francis
Number of pages6
ISBN (Electronic)9781315648415
ISBN (Print)9781138028791
Publication statusPublished - 2015
EventEuropean Safety and Reliability Conference (ESREL) 2015 - Zurich, Switzerland
Duration: 7 Sep 201510 Sep 2015


ConferenceEuropean Safety and Reliability Conference (ESREL) 2015
Abbreviated titleESREL 2015

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