Function-centered modeling of engineering systems using the goal tree–success tree technique and functional primitives

Modarres, Mohammad; Cheon, Se Woo

doi:10.1016/s0951-8320(98)00062-3

Cited by 81 publications

(40 citation statements)

References 14 publications

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“…Future work will be devoted to explore other system modeling and analysis approaches for comparison, like for example Multilevel Flow Modelling (MFM) [30], Stocastic Flowgraphs [31], Goal Tree Success Tree -Master Logic Diagram (GTST -MLD) [32], with the aim of pointing out limitations and benefits with respect to their application.…”

Section: Discussionmentioning

confidence: 99%

Assessing nuclear power plant safety and recovery from earthquakes using a system-of-systems approach

Ferrario

Zio

2014

Reliability Engineering & System Safety

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To cite this version:Elisa Ferrario, Enrico Zio. Assessing nuclear power plant safety and recovery from earthquakes using a system-of-systems approach. Reliability Engineering and System Safety, Elsevier, 2014, 125 (SI) AbstractWe adopt a 'system-of-systems' framework of analysis, previously presented by the authors, to include the interdependent infrastructures which support a critical plant in the study of its safety with respect to the occurrence of an earthquake. We extend the framework to consider the recovery of the system of systems in which the plant is embedded. As a test system, we consider the impacts produced on a nuclear power plant (the critical plant) embedded in the connected power and water distribution, and transportation networks which support its operation. The Seismic Probabilistic Risk Assessment of such system of systems is carried out by Hierarchical modeling and Monte Carlo simulation. First, we perform a top-down analysis through a hierarchical model to identify the elements that at each level have most influence in restoring safety, adopting the criticality importance measure as a quantitative indicator. Then, we evaluate by Monte Carlo simulation the probability that the nuclear power plant enters in an unsafe state and the time needed to recover its safety. The results obtained allow the identification of those elements most critical for the safety and recovery of the nuclear power plant; this is relevant for determining improvements of their structural/functional responses and supporting the decision-making process on safety critical-issues. On the test system considered, under the given assumptions, the components of the external and internal water systems (i.e., pumps and pool) turn out to be the most critical for the safety and recovery of the plant.

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Section: Discussionmentioning

confidence: 99%

Assessing nuclear power plant safety and recovery from earthquakes using a system-of-systems approach

Ferrario

Zio

2014

Reliability Engineering & System Safety

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“…A first example is given by Modarres and Cheon (1999), who explicitly require that the representations of technical functions satisfy conservation laws as given by the natural sciences: the input flows listed in representations as given in Fig. 4 should together have equal energy as the listed output flows have, should in a similar way conserve charge, and so on.…”

Section: The Generality Of the Proofmentioning

confidence: 99%

“…Hubka and Eder 1988;Keuneke 1991;Lind 1994;Pahl and Beitz 1996;Sasajima et al 1996;Modarres and Cheon 1999;Stone and Wood 2000;Chakrabarti and Bligh 2001;Otto and Wood 2001;Fantoni et al 2009). And the results hold for methods in which this representation of functions is not adopted but for which it can be argued that such transformations of flows still count as special cases of functions (e.g.…”

Section: Introductionmentioning

confidence: 99%

On the formal impossibility of analysing subfunctions as parts of functions in design methodology

Vermaas

2012

Res Eng Design

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In this paper, a proof is given that in design methods, the relation between technical functions and their subfunctions in functional descriptions of technical products cannot be analysed as a formal relation of parthood. This result holds for design methods in which transformations of flows of energy, material and signals are accepted as functions. First, two specific categories of such technical functions are modelled. Second, the composition relation by which ordered sets of these functions define other functions is characterised. Third, it is shown that this composition relation for technical functions does not meet the basic postulates of parthood relations as given by mereology, the theory of parthood. It still may be beneficial to designing to take subfunctions informally as the parts of the functions they compose. Yet, the proof shows that when functional descriptions are formalised for, for instance, the development of automated design reasoning tools or for incorporation in engineering ontologies, the composition relation for technical functions cannot unconditionally be taken as a parthood relation.

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“…This concept will help define the fundamental pillars upon which the overall maintenance operation rests. From these basic pillars, a group of attributes will be derived using a hierarchical decomposition such as the Goal Tree Analysis [4].…”

Section: Overviewmentioning

confidence: 99%

“…Goal Tree Analysis (GTA) [4] is the means used in this thesis to perform a hierarchical decomposition of each of the strategic goals. The purpose of the decomposition is to arrive to the lowest measurable function, whereby obtaining the fundamental attributes.…”

Section: Hierarchical Decomposition Using Goal Tree Analysismentioning

confidence: 99%

A structured methodology for identifying performance metrics and monitoring maintenance effectiveness

Amoedo

Modarres

RAMS '06. Annual Reliability and Maintainability Symposium, 2006.

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Most current maintenance programs focus on achieving the main goals of maintenance operations: increasing mean time between failures, reducing time to repair and minimizing costs. Some researchers have focused on optimizing these variables. Detailed analyses have been conducted in the fields of equipment wellness, spares administration, planned maintenance and structured organization. Still, many organizations fail to fulfill today's ambitious objective of guaranteeing operations while achieving high reliability and maintaining safety. A comprehensive method of maintenance assessment that considers key factors and indicators that influence the main goals of maintenance is still sought after. This paper discusses a new approach to performance-based maintenance management. The objective is to determine an integrated reliability management system that provides a method of aligning maintenance operations with the business strategy and monitoring performance of key technical, human and organization goals over time.

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Function-centered modeling of engineering systems using the goal tree–success tree technique and functional primitives

Cited by 81 publications

References 14 publications

Assessing nuclear power plant safety and recovery from earthquakes using a system-of-systems approach

Assessing nuclear power plant safety and recovery from earthquakes using a system-of-systems approach

On the formal impossibility of analysing subfunctions as parts of functions in design methodology

A structured methodology for identifying performance metrics and monitoring maintenance effectiveness

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