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All Outputs (36)

Analysing the impact of local factors on the life cycle of metallic bridge girders (2023)
Conference Proceeding
Calvert, G., Hamer, M., Neves, L., & Andrews, J. (2023). Analysing the impact of local factors on the life cycle of metallic bridge girders. In F. Biondini, & D. M. Frangopol (Eds.), Life-Cycle of Structures and Infrastructure Systems: PROCEEDINGS OF THE EIGHTH INTERNATIONAL SYMPOSIUM ON LIFE-CYCLE CIVIL ENGINEERING (IALCCE 2023), 2-6 JULY, 2023, POLITECNICO DI MILANO, 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.

An Integrated Modelling Framework for Complex Systems Safety Analysis: Case-Studies (2022)
Conference Proceeding
Tolo, S., & Andrews, J. (2022). An Integrated Modelling Framework for Complex Systems Safety Analysis: Case-Studies. In M. C. Leva, E. Patelli, L. Podofillini, & S. Wilson (Eds.), Book of Extended Abstracts for the 32nd European Safety and Reliability Conference (135-136)

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.

A Petri Net approach to the Risk Analysis of Jet Engines (2022)
Conference Proceeding
Tolo, S., Andrews, J., Thatcher, I., & Stamp, D. (2022). A Petri Net approach to the Risk Analysis of Jet Engines. In M. Chiara Leva, E. Patelli, L. Podofillini, & S. Wilson (Eds.), Book of Extended Abstracts for the 32nd European Safety and Reliability Conference (137-138)

Traditional risk analysis techniques such as Fault Trees and Event Trees fail to model complex aspects of systems behaviour such as components dependencies, degradation, limiting their capability of representing modern engineering systems. This is al... Read More about A Petri Net approach to the Risk Analysis of Jet Engines.

Fault Tree analysis including component dependencies (2022)
Conference Proceeding
Tolo, S., & Andrews, J. (2022). Fault Tree analysis including component dependencies. In M. C. Leva, E. Patelli, L. Podofillini, & S. Wilson (Eds.), Book of Extended Abstracts for the 32nd European Safety and Reliability Conference (133-134). https://doi.org/10.1109/TR.2023.3264943

The inability of commonly used risk assessment methodologies to model component dependency is often recognised to be a barrier towards more realistic modelling of systems complexity. This is a significant limitation associated with widely adopted tec... Read More about Fault Tree analysis including component dependencies.

Dynamic and Dependent Tree Theory (D 2 T 2 ): A Fault Tree Analysis Framework (2022)
Conference Proceeding
Andrews, J., & Tolo, S. (2022). Dynamic and Dependent Tree Theory (D 2 T 2 ): A Fault Tree Analysis Framework. In M. Chiara Leva, E. Patelli, L. Podofillini, & S. Wilson (Eds.), Book of Extended Abstracts for the 32nd European Safety and Reliability Conference (139-140)

A modelling framework, known as Dynamic and Dependent Tree Theory, is provided which overcomes restrictions in the Kinetic Tree Theory developed in the 1970s for the analysis of fault trees. Kinetic Tree Theory assumes basic events to be independent... Read More about Dynamic and Dependent Tree Theory (D 2 T 2 ): A Fault Tree Analysis Framework.

A Petri Net Methodology for Modeling the Resilience of Nuclear Power Plants (2021)
Conference Proceeding
Yan, R., Dunnett, S., Tolo, S., & Andrews, J. (2021). A Petri Net Methodology for Modeling the Resilience of Nuclear Power Plants. In B. Castanier, M. Cepin, D. Bigaud, & C. Berenguer (Eds.), In Proceedings of the 31st European Safety and Reliability Conference (ESREL 2021) (2426-2432). https://doi.org/10.3850/978-981-18-2016-8_109-cd

In the paper, a novel Petri Net (PN) method for assessing the resilience of nuclear reactors is presented. The PN model constructed aims to simulate the failure of the subsystems in a reactor caused by either natural degradation or external disruptiv... Read More about A Petri Net Methodology for Modeling the Resilience of Nuclear Power Plants.

A Modelling Framework for Dynamic Safety Assessment (2021)
Conference Proceeding
Tolo, S., Yan, R., Dunnett, S., & Andrews, J. (2021). A Modelling Framework for Dynamic Safety Assessment. In B. Castanier, M. Cepin, D. Bigaud, & C. Berenguer (Eds.), Proceedings of the 31st European Safety and Reliability Conference (ESREL 2021) (2434-2440). https://doi.org/10.3850/978-981-18-2016-8_163-cd

The concept of resilience is progressively making its way into the design, operation and management practice of complex engineering systems. The core of such trend lies with the integration of failure mechanisms in the modelling of systems since the... Read More about A Modelling Framework for Dynamic Safety Assessment.

Evolved Methods for Risk Assessment (2021)
Conference Proceeding
Jackson, A., Tolo, S., & Andrews, J. (2021). Evolved Methods for Risk Assessment. In B. Castanier, M. Cepin, D. Bigaud, & C. Berenguer (Eds.), Proceedings of the 31st European Safety and Reliability Conference (ESREL 2021) (217-224). https://doi.org/10.3850/978-981-18-2016-8_194-cd

The foundations of risk assessment tools such as fault tree analysis and event tree analysis were established in the 1970s. Since then, research has made considerable advances in the capabilities of analytical techniques applicable to safety critical... Read More about Evolved Methods for Risk Assessment.

Modelling the interactions between defect mechanisms on metal bridges (2021)
Conference Proceeding
Calvert, G., Neves, L., Andrews, J., & Hamer, M. (2021). Modelling the interactions between defect mechanisms on metal bridges. In Bridge Maintenance, Safety, Management, Life-Cycle Sustainability and Innovations: Proceedings of the Tenth International Conference on Bridge Maintenance, Safety and Management (IABMAS 2020)

Bridge asset managers have finite resources at their disposal to minimise the risk of structural failure and ensure bridges are maintained to a suitable safety threshold. Any maintenance strategy must be efficient in its use of resources and deliver... Read More about Modelling the interactions between defect mechanisms on metal bridges.

Resilience in the context of Nuclear safety engineering (2020)
Conference Proceeding
Yan, R., Tolo, S., Dunnett, S., Andrews, J., & Patelli, E. (2020). Resilience in the context of Nuclear safety engineering

The safety and reliability of critical infrastructures is a key challenge in modern societies. This is all the more true when referring to the nuclear power industry, due to the rigid safety requirements on the one hand and the growing complexity of... Read More about Resilience in the context of Nuclear safety engineering.

Petri Nets and Pseudo-Bond Graphs for a Nuclear Reactor Primary Coolant System (2019)
Conference Proceeding
Wootton, M. J., Andrews, J., Lloyd, A. L., Smith, R., Arul, A. J., Vinod, G., …Garg, V. (2019). Petri Nets and Pseudo-Bond Graphs for a Nuclear Reactor Primary Coolant System. In M. Beer, & E. Zio (Eds.), Proceedings of the 29th European Safety and Reliability Conference (ESREL 2019) (3831-3838). https://doi.org/10.3850/978-981-11-2724-3_0536-cd

In this paper we demonstrate the application of timed Petri Net methodology to the frequency of initiating faults in the coolant circulation system of a fictional nuclear reactor design. A second model is presented where the Petri Net is coupled with... Read More about Petri Nets and Pseudo-Bond Graphs for a Nuclear Reactor Primary Coolant System.

Nuclear Facilities and Cyber Threats (2019)
Conference Proceeding
Tolo, S., & Andrews, J. (2019). Nuclear Facilities and Cyber Threats. In M. Beer, & E. Zio (Eds.), Proceedings of the 29th European Safety and Reliability Conference (ESREL 2019). https://doi.org/10.3850/978-981-11-2724-3_0966-cd

The exponential growth of digital technologies experienced in the last decades has shaped contemporary societies so thoroughly to earn the definition of digital revolution or third industrial revolution. Along with the penetration rate of digital tec... Read More about Nuclear Facilities and Cyber Threats.

Efficient risk based optimization of large system models using a reduced petri net methodology (2019)
Conference Proceeding
Naybour, S., Andrews, J., & Chiachio-Ruano, M. (2019). Efficient risk based optimization of large system models using a reduced petri net methodology. In M. Beer, & E. Zio (Eds.), Proceedings of the 29th European Safety and Reliability Conference (ESREL 2019), 826-834. https://doi.org/10.3850/978-981-11-2724-3_+0212-cd

The methodology presented in this paper is a two-stage optimization approach that can be applied to large system level models, in this case using a Stochastic Petri Net (SPN) framework, to produce an equivalent model response at a reduced computation... Read More about Efficient risk based optimization of large system models using a reduced petri net methodology.

A petri net methodology for modelling the maintenance of railway route sections (2019)
Conference Proceeding
Litherland, J., & Andrews, J. (2019). A petri net methodology for modelling the maintenance of railway route sections. In M. Beer, & E. Zio (Eds.), Proceedings of the 29th European Safety and Reliability Conference (ESREL 2019), 452-460. https://doi.org/10.3850/978-981-11-2724-3_+0137-cd

Railway utilization is increasing. In 2017-18 there were over 1.7 billion passenger journeys made on the UK railway network, more than double the number made in 1995. Therefore getting maximum performance from the existing network by streamlining mai... Read More about A petri net methodology for modelling the maintenance of railway route sections.

Development of an extended RAMS framework for railway networks (2019)
Conference Proceeding
Litherland, J., Calvert, G., Andrews, J., & Kirwan, A. (2019). Development of an extended RAMS framework for railway networks. In M. Beer, & E. Zio (Eds.), Proceedings of the 29th European Safety and Reliability Conference (ESREL 2019), 3489-3497. https://doi.org/10.3850/978-981-11-2724-3_+0124-cd

Railway asset managers have finite resources which requires them to make strategic decisions on where, when and how the available budget will be spent on the railway, while ensuring safety limits are maintained and a high level of performance is deli... Read More about Development of an extended RAMS framework for railway networks.

Quantifying the impact of variability in railway bridge asset management (2018)
Conference Proceeding
Yianni, P. C., Neves, L. C., Rama, D., Andrews, J. D., Tedstone, N., & Dean, R. (2018). Quantifying the impact of variability in railway bridge asset management.

Bridge asset management is often a challenging and complicated task due to the diversity, multitude and variation of bridge configurations. Much research has been carried out in the field of asset management which has resulted in a wealth of models t... Read More about Quantifying the impact of variability in railway bridge asset management.

Producing effective maintenance strategies to control railway risk (2018)
Conference Proceeding
Fecarotti, C., & Andrews, J. (2018). Producing effective maintenance strategies to control railway risk. In Probabilistic Safety Assessment and Management PSAM 14 , September 2018 , Los Angeles, CA

This paper describes the main features of a modelling framework that sets out a systematic approach to railway infrastructure asset management enabling decisions to be made based not only on costs but on service performance and safety. First, the fra... Read More about Producing effective maintenance strategies to control railway risk.

Modelling adaptive systems using plausible Petri nets (2018)
Conference Proceeding
Chiachío, J., Chiachío, M., Prescott, D., & Andrews, J. (2018). Modelling adaptive systems using plausible Petri nets. In 8th International Workshop on Reliable Engineering Computing, “ Computing with Confidence ”

One of the main challenges when analyzing and modelling complex systems using Petri nets is to deal with uncertain information, and moreover, to be able to use such uncertainty to dynamically adapt the modelled system to uncertain (changing) contextu... Read More about Modelling adaptive systems using plausible Petri nets.

Using Petri-Net modelling for a data-driven approach to bridge management and safety (2018)
Conference Proceeding
Yianni, P. C., Neves, L. C., Rama, D., Andrews, J., & Dean, R. (2018). Using Petri-Net modelling for a data-driven approach to bridge management and safety.

Bridge portfolio managers have a difficult task managing a large, varied portfolio of aging assets in a squeezed financial climate and on networks with increasing usage. Therefore, decision support tools are becoming more and more integral in managin... Read More about Using Petri-Net modelling for a data-driven approach to bridge management and safety.