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A Petri net approach to assess the effects of railway maintenance on track availability (2020)
Journal Article
Fecarotti, C., & Andrews, J. (2020). A Petri net approach to assess the effects of railway maintenance on track availability. Infrastructure Asset Management, 7(3), 201-220. https://doi.org/10.1680/jinam.18.00046

The railway infrastructure includes a portfolio of assets that are subjected to degradation and failure processes due to both usage and ageing. As a consequence of degradation and failures, speed restrictions and line closures may be imposed to contr... Read More about A Petri net approach to assess the effects of railway maintenance on track availability.

Modelling interactions between multiple bridge deterioration mechanisms (2020)
Journal Article
Calvert, G., Neves, L., Andrews, J., & Hamer, M. (2020). Modelling interactions between multiple bridge deterioration mechanisms. Engineering Structures, 221, Article 111059. https://doi.org/10.1016/j.engstruct.2020.111059

Bridge asset managers are tasked with developing effective maintenance strategies by the stakeholders of transportation networks. Any presentation of maintenance strategies requires an estimate of the consequence on the Whole Life Cycle Cost (WLCC),... Read More about Modelling interactions between multiple bridge deterioration mechanisms.

Ranking the critical sections of railway networks (2020)
Journal Article
Meesit, R., & Andrews, J. (2021). Ranking the critical sections of railway networks. Proceedings of the Institution of Mechanical Engineers, Part F: Journal of Rail and Rapid Transit, 235(3), 361-376. https://doi.org/10.1177/0954409720925689

Railway systems are now facing an increasing number of threats such as aging infrastructures and climate changes. The identification of critical network sections provides infrastructure managers with the ability to understand the impact of a disrupti... Read More about Ranking the critical sections of railway networks.

Multi-defect modelling of bridge deterioration using truncated inspection records (2020)
Journal Article
Calvert, G., Neves, L., Andrews, J., & Hamer, M. (2020). Multi-defect modelling of bridge deterioration using truncated inspection records. Reliability Engineering and System Safety, 200, Article 106962. https://doi.org/10.1016/j.ress.2020.106962

Bridge Management Systems (BMS) are decision support tools that have gained widespread use across the transportation infrastructure management industry. The Whole Life Cycle Cost (WLCC) modelling in a BMS is typically composed of two main components:... Read More about Multi-defect modelling of bridge deterioration using truncated inspection records.

Resilience in the context of Nuclear safety engineering (2020)
Presentation / Conference Contribution
Yan, R., Tolo, S., Dunnett, S., Andrews, J., & Patelli, E. (2020, January). Resilience in the context of Nuclear safety engineering. Presented at RAMS 2020: 66th Annual Reliability and Maintainability Symposium, Palm Springs, California, USA

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)
Presentation / Conference Contribution
Wootton, M. J., Andrews, J., Lloyd, A. L., Smith, R., Arul, A. J., Vinod, G., Prasad, S. H., & Garg, V. (2019, September). Petri Nets and Pseudo-Bond Graphs for a Nuclear Reactor Primary Coolant System. Presented at 29th European Safety and Reliability Conference (ESREL 2019), Hannover, Germany

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)
Presentation / Conference Contribution
Tolo, S., & Andrews, J. (2019, September). Nuclear Facilities and Cyber Threats. Presented at 29th European Safety and Reliability Conference (ESREL 2019), Hannover, Germany

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.

A petri net methodology for modelling the maintenance of railway route sections (2019)
Presentation / Conference Contribution
Litherland, J., & Andrews, J. (2019, September). A petri net methodology for modelling the maintenance of railway route sections. Presented at 29th European Safety and Reliability Conference (ESREL 2019), Hannover, Germany

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.

Efficient risk based optimization of large system models using a reduced petri net methodology (2019)
Presentation / Conference Contribution
Naybour, S., Andrews, J., & Chiachio-Ruano, M. (2019, September). Efficient risk based optimization of large system models using a reduced petri net methodology. Presented at 29th European Safety and Reliability Conference (ESREL 2019), Hannover, Germany

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.

Development of an extended RAMS framework for railway networks (2019)
Presentation / Conference Contribution
Litherland, J., Calvert, G., Andrews, J., & Kirwan, A. (2019, September). Development of an extended RAMS framework for railway networks. Presented at 29th European Safety and Reliability Conference (ESREL 2019), Hannover, Germany

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.

Optimising Rail Replacement Bus Services During Infrastructure Possessions (2019)
Journal Article
Meesit, R., & Andrews, J. (2019). Optimising Rail Replacement Bus Services During Infrastructure Possessions. Infrastructure Asset Management, https://doi.org/10.1680/jinam.18.00042

Providing rail-replacement bus services is a common strategy applied to handle track blockage situations in railway networks. Previously, a great deal of research has focused on modelling this strategy, particularly in the case of unplanned disruptio... Read More about Optimising Rail Replacement Bus Services During Infrastructure Possessions.

Modelling the effect of hydrogen on crack growth in zirconium (2019)
Journal Article
Lloyd, A. L., Smith, R., Wootton, M. J., Andrews, J., Arul, J., Muruva, H. P., & Vinod, G. (2019). Modelling the effect of hydrogen on crack growth in zirconium. Nuclear Instruments and Methods in Physics Research Section B: Beam Interactions with Materials and Atoms, 455, 13-20. https://doi.org/10.1016/j.nimb.2019.06.017

Via molecular dynamics simulations, the effects of hydrogen on stress evolution of -zirconium and crack propagation in monocrystalline and multiple grained zirconium systems are investigated. Diffusion barriers are shown to reduce when strain is appl... Read More about Modelling the effect of hydrogen on crack growth in zirconium.

An efficient algorithm for computing exact system and survival signatures of K-terminal network reliability (2019)
Journal Article
Reed, S., Löfstrand, M., & Andrews, J. (2019). An efficient algorithm for computing exact system and survival signatures of K-terminal network reliability. Reliability Engineering and System Safety, 185, 429-439. https://doi.org/10.1016/j.ress.2019.01.011

An efficient algorithm is presented for computing exact system and survival signatures of K-terminal reliability in undirected networks with unreliable edges. K-terminal reliability is defined as the probability that a subset K of the network nodes c... Read More about An efficient algorithm for computing exact system and survival signatures of K-terminal network reliability.

Plausible petri nets as self-adaptive expert systems: a tool for infrastructure asset monitoring (2018)
Journal Article
Chiachío, M., Chiachío, J., Prescott, D., & Andrews, J. (2019). Plausible petri nets as self-adaptive expert systems: a tool for infrastructure asset monitoring. Computer-Aided Civil and Infrastructure Engineering, 34(4), 281-298. https://doi.org/10.1111/mice.12427

This paper provides a computational framework to model self-adaptive expert systems using the Petri net (PN) formalism. Self-adaptive expert systems are understood here as expert systems with the ability to autonomously learn from external inputs, li... Read More about Plausible petri nets as self-adaptive expert systems: a tool for infrastructure asset monitoring.

Quantifying the impact of variability in railway bridge asset management (2018)
Presentation / Conference Contribution
Yianni, P. C., Neves, L. C., Rama, D., Andrews, J. D., Tedstone, N., & Dean, R. Quantifying the impact of variability in railway bridge asset management. Presented at The Sixth International Symposium on Life-Cycle Civil Engineering (IALCCE 2018)

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.

Sensor selection for fault diagnostics using performance metric (2018)
Journal Article
Andrews, J., Reeves, J., Reeves, J., Remenyte-Prescott, R., & Andrews, J. (2018). Sensor selection for fault diagnostics using performance metric. Proceedings of the Institution of Mechanical Engineers, Part O: Journal of Risk and Reliability, 233(4), 537-552. https://doi.org/10.1177/1748006X18804690

As technology advances, modern systems are becoming increasingly complex, consisting of large numbers of components, and therefore large numbers of potential component failures. These component failures can result in reduced system performance, or ev... Read More about Sensor selection for fault diagnostics using performance metric.

A methodology for railway track maintenance modelling using Plausible Petri nets (2018)
Presentation / Conference Contribution
Chiachio, M., Chiachio, J., Prescott, D., & Andrews, J. (2018, September). A methodology for railway track maintenance modelling using Plausible Petri nets. Paper presented at Probabilistic Safety Assessment and Management PSAM 14

This paper proposes a new mathematical methodology to model expert systems with the ability to sequentially learn from data. To this end, the Plausible Petri nets (PPNs) methodology, first developed in M. Chiachío et al. [Proceedings of the Future Te... Read More about A methodology for railway track maintenance modelling using Plausible Petri nets.

Producing effective maintenance strategies to control railway risk (2018)
Presentation / Conference Contribution
Fecarotti, C., & Andrews, J. (2018, September). Producing effective maintenance strategies to control railway risk. Presented at PSAM 14 Probabilistic Safety Assessment and Management, Los Angeles, California, USA

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.

A sensor selection method using a performance metric for phased missions of aircraft fuel systems (2018)
Journal Article
Reeves, J., Remenyte-Prescott, R., Andrews, J., & Thorley, P. (2018). A sensor selection method using a performance metric for phased missions of aircraft fuel systems. Reliability Engineering and System Safety, https://doi.org/10.1016/j.ress.2018.07.029

Component failures in complex systems, such as aircraft fuel systems, can have catastrophic effects on system performance. There are a large number of components in these systems, each with a number of different failure modes, some of which can cause... Read More about A sensor selection method using a performance metric for phased missions of aircraft fuel systems.