All Outputs (65)

Modelling interactions between multiple bridge deterioration mechanisms (2020)
Journal Article

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

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

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.

Optimising Rail Replacement Bus Services During Infrastructure Possessions (2019)
Journal Article

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

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

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

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.

Sensor selection for fault diagnostics using performance metric (2018)
Journal Article

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 sensor selection method using a performance metric for phased missions of aircraft fuel systems (2018)
Journal Article

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.

A knowledge-based prognostics framework for railway track geometry degradation (2018)
Journal Article

This paper proposes a paradigm shift to the problem of infrastructure asset management modelling by focusing towards forecasting the future condition of the assets instead of using empirical modelling approaches based on historical data. The proposed... Read More about A knowledge-based prognostics framework for railway track geometry degradation.

A Petri Net-based life cycle cost analysis approach (2018)
Journal Article

Railway infrastructure providers, such as Network Rail, who owns and manages the British railway infrastructure, can improve the performance and reduce the life cycle cost of their assets through delivering effective asset management. Having the capa... Read More about A Petri Net-based life cycle cost analysis approach.

A new paradigm for uncertain knowledge representation by Plausible Petri nets (2018)
Journal Article

This paper presents a new model for Petri nets (PNs) which combines PN principles with the foundations of information theory for uncertain knowledge representation. The resulting framework has been named Plausible Petri nets (PPNs). The main feature... Read More about A new paradigm for uncertain knowledge representation by Plausible Petri nets.

Editorial special issue: PHM for railway systems and mass transportation (2018)
Journal Article

Component-based modelling of PEM fuel cells with bond graphs (2017)
Journal Article

A polymer electrolyte membrane (PEM) fuel cell is a power generation device that transforms chemical energy contained within hydrogen and oxygen gases into useful electricity. The performance of a PEMFC unit is governed by three interdependent physic... Read More about Component-based modelling of PEM fuel cells with bond graphs.

Railway bridge structural health monitoring and fault detection: state-of-the-art methods and future challenges (2017)
Journal Article

Railway importance in the transportation industry is increasing continuously, due to the growing demand of both passenger travel and transportation of goods. However, more than 35% of the 300,000 railway bridges across Europe are over 100-years old,... Read More about Railway bridge structural health monitoring and fault detection: state-of-the-art methods and future challenges.

Accelerating Petri-Net simulations using NVIDIA graphics processing units (2017)
Journal Article

Stochastic Petri-Nets (PNs) are combined with General-Purpose Graphics Processing Unit (GPGPUs) to develop a fast and low cost framework for PN modelling. GPGPUs are composed of many smaller, parallel compute units which has made them ideally suited... Read More about Accelerating Petri-Net simulations using NVIDIA graphics processing units.

Delayed maintenance modelling considering speed restriction for a railway section (2017)
Journal Article

The deterioration of track geometry depends on several factors of which the speed of the train is one. Imposing a speed restriction can slow down the track deterioration and allows a longer survival time before a serious condition is achieved. Preven... Read More about Delayed maintenance modelling considering speed restriction for a railway section.

A new algorithm for prognostics using subset simulation (2017)
Journal Article

This work presents an efficient computational framework for prognostics by combining the particle filter-based prognostics principles with the technique of Subset Simulation, first developed in S.K. Au and J.L. Beck [Probabilistic Engrg. Mech., 16 (2... Read More about A new algorithm for prognostics using subset simulation.

A Petri net model for railway bridge maintenance (2017)
Journal Article

This article describes the application of the Petri net modelling approach to managing the maintenance process of railway bridges. The Petri net model accounts for the degradation, inspection and repair processes of individual bridge elements in inve... Read More about A Petri net model for railway bridge maintenance.

A modelling approach for railway overhead line equipment asset management (2017)
Journal Article

© 2017 Elsevier Ltd The Overhead Line Equipment (OLE) is a critical sub-system of the 25 kV AC overhead railway electrification system. If OLE asset management strategies can be evaluated using a whole lifecycle cost analysis that considers degradati... Read More about A modelling approach for railway overhead line equipment asset management.