All Outputs (114)

A Petri net asset management framework for railway switches and crossings (2022)
Journal Article
Litherland, J., & Andrews, J. (2022). A Petri net asset management framework for railway switches and crossings. Proceedings of the Institution of Mechanical Engineers, Part F: Journal of Rail and Rapid Transit, https://doi.org/10.1177/09544097221110970

Switches and Crossings (S&C) are a fundamental part of any railway network, they allow trains to switch between tracks and to cross over other tracks. They consist of various electrical and mechanical components to which there is a substantial mainte... Read More about A Petri net asset management framework for railway switches and crossings.

A reliability study of railway switch and crossing components (2022)
Journal Article
Litherland, J., & Andrews, J. (2022). A reliability study of railway switch and crossing components. Proceedings of the Institution of Mechanical Engineers, Part F: Journal of Rail and Rapid Transit, https://doi.org/10.1177/09544097221100672

Within any railway network Switches and Crossings (S&C) are essential. They allow trains to change tracks, allowing different routes to be selected. Despite their necessity, they generally have a lower reliability than plain line track and are often... Read More about A reliability study of railway switch and crossing components.

Reduction of Petri net maintenance modeling complexity via Approximate Bayesian Computation (2022)
Journal Article
Chiachío, M., Saleh, A., Naybour, S., Chiachío, J., & Andrews, J. (2022). Reduction of Petri net maintenance modeling complexity via Approximate Bayesian Computation. Reliability Engineering and System Safety, 222, Article 108365. https://doi.org/10.1016/j.ress.2022.108365

The accurate modeling of engineering systems and processes using Petri nets often results in complex graph representations that are computationally intensive, limiting the potential of this modeling tool in real life applications. This paper presents... Read More about Reduction of Petri net maintenance modeling complexity via Approximate Bayesian Computation.

Railway track availability modelling with opportunistic maintenance practice (2021)
Journal Article
Davies, B., & Andrews, J. (2022). Railway track availability modelling with opportunistic maintenance practice. Proceedings of the Institution of Mechanical Engineers, Part F: Journal of Rail and Rapid Transit, 236(8), 907-919. https://doi.org/10.1177/09544097211047663

The geometry of railway track must be maintained within certain standards in order to provide a highly available network, as well as good ride comfort and safety for all rail users. Modelling is well utilised as part of asset management tools in expl... Read More about Railway track availability modelling with opportunistic maintenance practice.

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.

Incorporating defect specific condition indicators in a bridge life cycle analysis (2021)
Journal Article
Calvert, G., Neves, L., Andrews, J., & Hamer, M. (2021). Incorporating defect specific condition indicators in a bridge life cycle analysis. Engineering Structures, 246, Article 113003. https://doi.org/10.1016/j.engstruct.2021.113003

Bridges are critical assets for the safe, reliable and functional operation of transportation networks. Infrastructure asset managers are responsible for ensuring that these bridges adhere to rigorous safety standards using the finite resources avail... Read More about Incorporating defect specific condition indicators in a bridge life cycle analysis.

A mathematical programming model to select maintenance strategies in railway networks (2021)
Journal Article
Fecarotti, C., Andrews, J., & Pesenti, R. (2021). A mathematical programming model to select maintenance strategies in railway networks. Reliability Engineering and System Safety, 216, Article 107940. https://doi.org/10.1016/j.ress.2021.107940

This paper presents a nonlinear integer programming model to support the selection of maintenance strategies to implement on different segments of a railway network. Strategies are selected which collectively minimise the impact of sections’ conditio... Read More about A mathematical programming model to select maintenance strategies in railway networks.

Modelling cycle for simulation digital twins (2021)
Journal Article
Reed, S., Löfstrand, M., & Andrews, J. (2021). Modelling cycle for simulation digital twins. Manufacturing Letters, 28, 54-58. https://doi.org/10.1016/j.mfglet.2021.04.004

Digital twins (DT) form part of the Industry 4.0 revolution within manufacturing and related industries. A DT is a digital model (DM) of a real system that features continuous and automated synchronisation and feedback of optimisations between the re... Read More about Modelling cycle for simulation digital twins.

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.

An alternative approach to railway asset management value analysis: application to a UK railway corridor (2021)
Journal Article
Litherland, J., Calvert, G., Andrews, J., Modhara, S., & Kirwan, A. (2021). An alternative approach to railway asset management value analysis: application to a UK railway corridor. Infrastructure Asset Management, 8(2), 85-97. https://doi.org/10.1680/jinam.21.00003

Railway networks are complex systems and the management of such systems is a challenging task for railway asset managers. It is their responsibility to ensure that the network delivers the highest level of performance for all stakeholders, whilst adh... Read More about An alternative approach to railway asset management value analysis: application to a UK railway corridor.

An alternative approach to railway asset management value analysis: framework development (2021)
Journal Article
Litherland, J., Calvert, G., Andrews, J., Modhara, S., & Kirwan, A. (2021). An alternative approach to railway asset management value analysis: framework development. Infrastructure Asset Management, 8(2), 75-84. https://doi.org/10.1680/jinam.20.00002

The management of a diverse asset portfolio is a demanding task for railway asset managers. They must ensure that the network delivers a high level of performance for customers and adheres to safety limits. Reliability, availability, maintainability... Read More about An alternative approach to railway asset management value analysis: framework development.

Dynamic Reliability Assessment of PEM Fuel Cell Systems (2021)
Journal Article
Vasilyev, A., Andrews, J., Dunnet, S., & Jackson, L. (2021). Dynamic Reliability Assessment of PEM Fuel Cell Systems. Reliability Engineering and System Safety, 210, Article 107539. https://doi.org/10.1016/j.ress.2021.107539

In this paper, a novel model for the dynamic reliability analysis of a polymer electrolyte membrane fuel cell system is developed to account for multi-state dynamics and ageing. The modelling approach involves the combination of physical and stochast... Read More about Dynamic Reliability Assessment of PEM Fuel Cell Systems.

Modelling stochastic behaviour in simulation digital twins through neural nets (2021)
Journal Article
Reed, S., Löfstrand, M., & Andrews, J. (2022). Modelling stochastic behaviour in simulation digital twins through neural nets. Journal of Simulation, 16(5), 512-525. https://doi.org/10.1080/17477778.2021.1874844

Discrete event simulation (DES) is a widely used technique for modelling systems where state changes occur at discrete points in time. Stochastic behaviour is represented through random variables associated with probability distributions, from which... Read More about Modelling stochastic behaviour in simulation digital twins through neural nets.

The impact of summer heatwaves on railway track geometry maintenance (2021)
Journal Article
Davies, B., & Andrews, J. (2021). The impact of summer heatwaves on railway track geometry maintenance. Proceedings of the Institution of Mechanical Engineers, Part F: Journal of Rail and Rapid Transit, 235(9), 1158-1171. https://doi.org/10.1177/0954409720984292

Elevated summer temperatures are a disrupting factor on the rail network. Due to the risk of a track buckling under thermal expansion forces, geometry maintenance must be delayed during heatwaves, leading to an overall decreased network availability... Read More about The impact of summer heatwaves on railway track geometry maintenance.

A Bayesian Belief Network method for bridge deterioration detection (2020)
Journal Article
Vagnoli, M., Remenyte-Prescott, R., & Andrews, J. (2021). A Bayesian Belief Network method for bridge deterioration detection. Proceedings of the Institution of Mechanical Engineers, Part O: Journal of Risk and Reliability, 235(3), 338-355. https://doi.org/10.1177/1748006X20979225

Bridges are one of the most important assets of transportation networks. A closure of a bridge can increase the vulnerability of the geographic area served by such networks, as it reduces the number of available routes. Condition monitoring and deter... Read More about A Bayesian Belief Network method for bridge deterioration detection.

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.