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    Function Modelling using the System State Flow Diagram

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    Publication date
    2017
    Author
    Yildirim, Unal
    Campean, I. Felician
    Williams, Huw
    Keyword
    Function modelling; State diagrams; System State Flow Diagram (SSFD); Functional architecture; Heuristics; Functional requirements; Systems engineering
    Rights
    © 2017 Cambridge University Press.This is an Open Access article, distributed under the terms of the Creative Commons Attribution licence (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted re-use, distribution, and reproduction in any medium, provided the original work is properly cited.
    Peer-Reviewed
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    Abstract
    This paper introduces a rigorous framework for function modelling of complex multi-disciplinary systems based on the System State Flow Diagram (SSFD). The work addresses the need for a consistent methodology to support solution neutral function based system decomposition analysis, facilitating the design, modelling and analysis of complex systems architectures. A rigorous basis for the SSFD is established by defining conventions for states and function definition and representation scheme, underpinned by a critical review of existing literature. A set of heuristics are introduced to support the function decomposition analysis and to facilitate the deployment of the methodology with strong practitioner guidelines. The SSFD heuristics extend the existing framework of Otto and Wood (2001) by introducing a conditional fork node heuristic, to facilitate analysis and aggregation of function models across multiple modes of operation of the system. The empirical validation of the SSFD function modelling framework is discussed in relation to its application to two case studies: (i) a benchmark problem (Glue Gun) set for the engineering design community; and (ii) an industrial case study of an electric vehicle powertrain. Based on the evidence from the two case studies presented in the paper, a critical evaluation of the SSFD function modelling methodology is presented based on the function benchmarking framework established by Summers et al (2013), considering the representation, modelling, cognitive and reasoning characteristics. The significance of this paper is that it establishes a rigorous reference framework for the SSFD function representation and a consistent methodology to guide the practitioner with its deployment, facilitating its impact to industrial practice.
    URI
    http://hdl.handle.net/10454/12640
    Version
    Published version
    Citation
    Yildirim U, Campean F and Williams H (2017) Function Modelling using the System State Flow Diagram. Artificial Intelligence for Engineering Design, Analysis and Manufacturing. 31(4): 413-435.
    Link to publisher’s version
    https://doi.org/10.1017/S0890060417000294
    Type
    Article
    Collections
    Engineering and Digital Technology Publications

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