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All Outputs (117)

Extending the dynamic and dependent tree theory (D2T2) to safety barriers: An application to an offshore fire deluge system (2025)
Journal Article
Leoni, L., Andrews, J., & De Carlo, F. (2025). Extending the dynamic and dependent tree theory (D2T2) to safety barriers: An application to an offshore fire deluge system. Journal of Loss Prevention in the Process Industries, 94, Article 105545. https://doi.org/10.1016/j.jlp.2025.105545

Fault Tree (FT) Analysis is still one of the most common approaches for conducting reliability analysis of complex systems. However, it conceals several limitations such as the assumption of independent events and inability to model modern maintenanc... Read More about Extending the dynamic and dependent tree theory (D2T2) to safety barriers: An application to an offshore fire deluge system.

System Petri net modelling for railway infrastructure asset management (2024)
Journal Article
Litherland, J., & Andrews, J. (2024). System Petri net modelling for railway infrastructure asset management. Infrastructure Asset Management, https://doi.org/10.1680/jinam.23.00046

Railway infrastructure managers face the challenge of attaining a high level of performance and safety while meeting strict financial targets. To assist with decision making, modelling is needed to predict and evaluate the outcomes of different maint... Read More about System Petri net modelling for railway infrastructure asset management.

An integrated Petri net-pseudo bond graph model for nuclear hazard assessment (2024)
Journal Article
Wootton, M. J., Andrews, J. D., Smith, R., Arul, A. J., Vinod, G., Prasad, M. H., & Garg, V. (2024). An integrated Petri net-pseudo bond graph model for nuclear hazard assessment. Safety and Reliability, 43(3), 135-185. https://doi.org/10.1080/09617353.2024.2363067

A pseudo-bond graph is presented to model the heat transferred from the fuel rods to the coolant via its cladding in a generic nuclear reactor case study. Simulations performed using this model are used to explore the temperatures of the core compone... Read More about An integrated Petri net-pseudo bond graph model for nuclear hazard assessment.

Calculation of the System Unavailability Measures of Component Importance Using the D2T2 Methodology of Fault Tree Analysis (2024)
Journal Article
Andrews, J., & Lunt, S. (2024). Calculation of the System Unavailability Measures of Component Importance Using the D2T2 Methodology of Fault Tree Analysis. Mathematics, 12(2), Article 292. https://doi.org/10.3390/math12020292

A recent development in Fault Tree Analysis (FTA), known as Dynamic and Dependent Tree Theory (D2T2), accounts for dependencies between the basic events, making FTA more powerful. The method uses an integrated combination of Binary Decision Diagrams... Read More about Calculation of the System Unavailability Measures of Component Importance Using the D2T2 Methodology of Fault Tree Analysis.

Analysing the impact of local factors on the life cycle of metallic bridge girders (2023)
Presentation / Conference Contribution
Calvert, G., Hamer, M., Neves, L., & Andrews, J. (2023, July). Analysing the impact of local factors on the life cycle of metallic bridge girders. Presented at Eighth International Symposium on Life-Cycle Civil Engineering (IALCCE 2023), Milan, Italy

A fundamental component of a life cycle analysis of a bridge is the modelling of asset condition post-construction. To enhance the accuracy of bridge deterioration models, several studies have calibrated models based on cohorts that incorporate struc... Read More about Analysing the impact of local factors on the life cycle of metallic bridge girders.

Fault Tree Analysis Including Component Dependencies (2023)
Journal Article
Tolo, S., & Andrews, J. (2024). Fault Tree Analysis Including Component Dependencies. IEEE Transactions on Reliability, 73(1), 413-421. https://doi.org/10.1109/TR.2023.3264943

Fault Tree analysis is not only the most common technique used in engineering practice for the estimation of system reliability, but is also a key tool shared between designers, analysts and regulators for safe operation and licensing purposes. In sp... Read More about Fault Tree Analysis Including Component Dependencies.

Next Generation Prediction Methodologies and Tools for System Safety Analysis (NxGen) – A Project Overview (2023)
Presentation / Conference Contribution
Sanderson, K., & Andrews, J. (2023, April). Next Generation Prediction Methodologies and Tools for System Safety Analysis (NxGen) – A Project Overview. Presented at 62nd ESReDA Seminar, University of Twente, the Netherlands

Modern engineering systems are rapidly increasing in size and complexity, posing greater safety and risk management challenges than ever before. In addition to this, the threats to these engineering systems are constantly changing and new hazards eme... Read More about Next Generation Prediction Methodologies and Tools for System Safety Analysis (NxGen) – A Project Overview.

Dynamic safety and degradation analysis of an aircraft internal air system (2023)
Presentation / Conference Contribution
Tolo, S., Andrews, J., Thatcher, I., & Stamp, D. (2023, April). Dynamic safety and degradation analysis of an aircraft internal air system. Presented at 62nd ESReDA Seminar, University of Twente, the Netherlands

The modelling of the dynamic behaviour of engineering systems offers an invaluable insight in the evolution of degradation and response of systems to failure and represents an essential step to lay the basis for resilience analysis. While traditional... Read More about Dynamic safety and degradation analysis of an aircraft internal air system.

Extension of Common Measures of Importance for Dynamic and Dependent Tree Theory (D2T2 ) (2023)
Presentation / Conference Contribution
Lunt, S., & Andrews, J. (2023, April). Extension of Common Measures of Importance for Dynamic and Dependent Tree Theory (D2T2 ). Presented at 62nd ESReDA Seminar, University of Twente, the Netherlands

Traditional Fault Tree Analysis (FTA), known as Kinetic Tree Theory (KTT), was derived by Vesely [1] to model and analyse engineering systems. The tree structure provides a clear visual representation of the causes of system failure in terms of compo... Read More about Extension of Common Measures of Importance for Dynamic and Dependent Tree Theory (D2T2 ).

The Dynamic and Dependent Tree Theory (D2T2 ) methodology Developed for Fault Tree Analysis (2023)
Presentation / Conference Contribution
Andrews, J., & Tolo, S. (2023, April). The Dynamic and Dependent Tree Theory (D2T2 ) methodology Developed for Fault Tree Analysis. Presented at 62nd ESReDA Seminar, University of Twente, the Netherlands

Fault Tree Analysis (FTA) has its origins back in the 1960’s with the mathematical framework, known as Kinetic Tree Theory (KTT) added at the end of the decade by Vesely. In KTT the analysis of the fault tree is performed in two stages. The first sta... Read More about The Dynamic and Dependent Tree Theory (D2T2 ) methodology Developed for Fault Tree Analysis.

Dependent and Dynamic Tree Theory (D2T2 ) for Event Tree Applications (2023)
Presentation / Conference Contribution
Tolo, S., & Andrews, J. (2023, April). Dependent and Dynamic Tree Theory (D2T2 ) for Event Tree Applications. Presented at 62nd ESReDA Seminar, University of Twente, the Netherlands

The demand for innovative and effective computational tools able to improve the accuracy of present modelling methodologies has been fuelled by the ever-increasing complexity of engineering systems. In spite of their shortcomings, such as their inabi... Read More about Dependent and Dynamic Tree Theory (D2T2 ) for Event Tree Applications.

A Petri net model-based resilience analysis of nuclear power plants under the threat of natural hazards (2022)
Journal Article
Yan, R., Dunnett, S., & Andrews, J. (2023). A Petri net model-based resilience analysis of nuclear power plants under the threat of natural hazards. Reliability Engineering and System Safety, 230, Article 108979. https://doi.org/10.1016/j.ress.2022.108979

Due to global climate change, nuclear power plants are increasingly exposed to the threats of extreme natural disasters. In this paper, a resilience engineering approach is applied to tackle all aspects of nuclear safety, spanning from design, operat... Read More about A Petri net model-based resilience analysis of nuclear power plants under the threat of natural hazards.

Dynamic and dependent tree theory (D2T2): A framework for the analysis of fault trees with dependent basic events (2022)
Journal Article
Andrews, J., & Tolo, S. (2023). Dynamic and dependent tree theory (D2T2): A framework for the analysis of fault trees with dependent basic events. Reliability Engineering and System Safety, 230, Article 108959. https://doi.org/10.1016/j.ress.2022.108959

Fault tree analysis remains the most commonly employed method, particularly in the safety critical industries, to predict the probability or frequency of system failures. Whilst it has its origins back in the 1960s, the assumptions employed in the ma... Read More about Dynamic and dependent tree theory (D2T2): A framework for the analysis of fault trees with dependent basic events.

Optimisation of nuclear reactor primary coolant design and maintenance parameters (2022)
Journal Article
Wootton, M. J., Zhou, Y., Andrews, J. D., Smith, R., Arul, A. J., Vinod, G., Prasad, M. H., & Garg, V. (2024). Optimisation of nuclear reactor primary coolant design and maintenance parameters. Applied Stochastic Models in Business and Industry, 40(3), 725-745. https://doi.org/10.1002/asmb.2722

An optimisation methodology is presented using the primary coolant circulation system of a nuclear reactor as its case study, the purpose of which is to find combinations of selected design and maintenance parameters to maximise the reactor safety an... Read More about Optimisation of nuclear reactor primary coolant design and maintenance parameters.

An integrated modelling framework for complex systems safety analysis (2022)
Journal Article
Tolo, S., & Andrews, J. (2022). An integrated modelling framework for complex systems safety analysis. Quality and Reliability Engineering International, 38(8), 4330-4350. https://doi.org/10.1002/qre.3212

The ever-increasing complexity of engineering systems has fuelled the need for novel and efficient computational tools able to enhance the accuracy of current modelling strategies for industrial systems. Indeed, traditional Fault and Event Tree techn... Read More about An integrated modelling framework for complex systems safety analysis.

An Integrated Modelling Framework for Complex Systems Safety Analysis: Case-Studies (2022)
Presentation / Conference Contribution
Tolo, S., & Andrews, J. (2022, August). An Integrated Modelling Framework for Complex Systems Safety Analysis: Case-Studies. Presented at 32nd European Safety and Reliability Conference (ESREL 2022), Dublin, Ireland

The ever-increasing complexity of engineering systems has fuelled the need for novel and efficient computational tools able to enhance the accuracy of current modelling strategies for industrial systems. Indeed, traditional Fault and Event Tree techn... Read More about An Integrated Modelling Framework for Complex Systems Safety Analysis: Case-Studies.