document

Infrastructure maintenance and replacement optimization under multiple uncertainties and managerial flexibility

van den Boomen, M. (author), Spaan, M.T.J. (author), Shang, Y. (author), Wolfert, A.R.M. (author)

Infrastructure maintenance and replacement decisions are subject to uncertainties such as regular asset degradation, structural failure, and price uncertainty. In the engineering domain, Markov Decision Processes (MDPs) typically focus on uncertainties regarding asset degradation and structural failure. While the literature in the engineering...

journal article 2020

document

Resilience Quantification of Large-Scale Water Distribution Networks: A Probabilistic Approach

Kammouh, O. (author), Nogal Macho, M. (author), Cimellaro, Gian Paolo (author), Wolfert, A.R.M. (author)

The capacity of a community to react to and resist during an emergency situation is highly related to the proper functioning of its infrastructure systems. Improving the infrastructure response and recovery capacity through management and adaptation strategies can help increase community resilience. Infrastructural assets are considered outdated...

conference paper 2020

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Multivariate simulation modelling for adaptive long-term infrastructure planning

Havelaar, M. (author), Jaspers, W. (author), van Nederveen, G.A. (author), Auping, Willem L. (author), Wolfert, A.R.M. (author)

Infrastructure asset managers are challenged by rapid changes around the world such as urbanisation and climate change. They have to deal with multiple complex and dynamic infrastructure systems that can influence each other and that can be influenced by various uncertain factors. Traditional planning methods are not well suited to complex and...

journal article 2019

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Untangling decision tree and real options analyses: a public infrastructure case study dealing with political decisions, structural integrity and price uncertainty

van den Boomen, M. (author), Spaan, M.T.J. (author), Schoenmaker, R. (author), Wolfert, A.R.M. (author)

Managerial flexibility in infrastructure investment and replacement decisions adds value. Real options analysis (ROA) captures this value under uncertain market prices. The concept of ROA is that future unfavourable payoffs can be deferred as soon as more information about market prices becomes available. The popularity of ROA is seen in a...

journal article 2019

document

Replacement optimization of ageing infrastructure under differential inflation

van den Boomen, M. (author), Leontaris, G. (author), Wolfert, A.R.M. (author)

Ageing public infrastructure assets necessitate economic replacement analysis. A common replacement problem concerns an existing asset challenged by a replacement option. Classic techniques obtained from the domain of engineering economics are the mainstream approach to replacement optimization in practice. However, the validity of these classic...

journal article 2019

document

Decision support for offshore asset construction using expert judgments for supply disruptions risk

Leontaris, G. (author), Morales Napoles, O. (author), Dewan, Ashish (author), Wolfert, A.R.M. (author)

Offshore asset construction is a complex and costly process that is subject to various uncertainties within the entire supply chain. Hence, both the construction management optimization and the reduction of deployment expenditures should be supported by automated decision support models which include proper representations of predominant...

journal article 2019

document

Reliability-based life cycle costing analysis for embedded rails in level crossings

Shang, Y. (author), van den Boomen, M. (author), de Man, Amy (author), Wolfert, A.R.M. (author)

Reliability-based life cycle costing analysis (LCCA) supports optimized decisions on capital and operational expenditures for engineering asset management. In addition, it allows investigation of the impact of maintenance decisions on designing the service life of assets. The application of reliability-based LCCA in railway practice is...

journal article 2019

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Expert judgement based maintenance decision support method for structures with a long service-life

Ter Berg, C.J.A. (author), Leontaris, G. (author), van den Boomen, M. (author), Spaan, M.T.J. (author), Wolfert, A.R.M. (author)

The optimal moment at which maintenance activities should be performed on structures with long service-life to guarantee the required quality of service is hard to define, due to uncertainties in their deterioration processes. Most of the developed methods and concepts use historical data to predict the deterioration process with deterministic...

journal article 2019

document

Long-term availability modelling of water treatment plants

Smith, Roland (author), van de Loo, Jasper (author), van den Boomen, M. (author), Khakzad, N. (author), Jan van Heck, Geert (author), Wolfert, A.R.M. (author)

Water treatment plants (WTPs) are characterised as complex configurations of repairable and deteriorating components. Previous studies have mainly focused on the average or steady-state availability of such systems while ignoring inherent characteristics like degradation. The current research proposes a two-level hierarchical model for long-term...

journal article 2019

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Offshore infrastructure planning using a vine copula approach for environmental conditions: an application for replacement maintenance of tidal energy infrastructure

de Nie, Ruben (author), Leontaris, G. (author), Hoogendoorn, Don (author), Wolfert, A.R.M. (author)

Installation and maintenance operations of offshore assets are impacted by local environmental conditions such as wave height and period, wind speed and current velocity. These parameters are substantially of influence for the asset planning (time and costs) given the uncertainty of operational windows. In this article, a method is proposed to...

journal article 2019

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A dynamic programming approach for economic optimisation of lifetime-extending maintenance, renovation, and replacement of public infrastructure assets under differential inflation

van den Boomen, M. (author), van den Berg, P.L. (author), Wolfert, A.R.M. (author)

In the next decades, many public infrastructure assets will reach the end of their life that they were originally designed for. Replacement costs are high, and therefore increasing effort is put into lifetime-extending maintenance, including major overhauls and renovations. A key question is whether the investments in lifetime-extending...

journal article 2018

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Using data analytics to understand why certain rail sections at the Dutch high-speed line are affected by RCF

Schalk, Ricks (author), Zoeteman, A. (author), Nunez, Alfredo (author), Wolfert, A.R.M. (author)

This paper describes the use of big data for analysing Rolling Contact Fatigue (RCF) phenomena at the High Speed Line (HSL Zuid) in The Netherlands. The authors developed a data model to investigate the impacting parameters in train-track interaction. This has been done to gain more insight in the circumstances where RCF occurs and to conclude...

conference paper 2017

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Data Analytics for the of RCF Damages on the Dutch High Speed Line

Schalk, R. (author), Nunez, Alfredo (author), Zoeteman, A. (author), Wolfert, A.R.M. (author)

During a typical measurement campaign, lots of temporal and spatial data can be gathered regarding the condition of the rail. This paper proposes two approaches that make use of data analytics techniques to find causes of rolling contact fatigue (RCF) damages. The first approach, named ‘bottom-up approach’, determines the influencing factors...

conference paper 2017

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Application of a bottom-up approach for the analysis of rolling contact fatigue in the Dutch high speed line

Schalk, R. (author), Zoeteman, A. (author), Nunez, Alfredo (author), Wolfert, A.R.M. (author)

This paper describes the use of big data analytics for understanding the Rolling Contact Fatigue (RCF) phenomena at the High Speed Line (HSL Zuid) in The Netherlands. The authors developed a data model to investigate the impacting parameters in train-track interaction. This has been done to gain more insight<br/>about the circumstances under...

conference paper 2017

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A life cycle costing approach for discounting in age and interval replacement optimisation models for civil infrastructure assets

van den Boomen, M. (author), Schoenmaker, R. (author), Wolfert, A.R.M. (author)

Civil infrastructure assets, such as roads, locks, bridges, treatment plants and storm surge barriers, are often characterised by long service lives and corresponding technical life cycles. When life cycles are long, the time value of money plays a role in asset management decision-making on capital investments and operation and maintenance...

journal article 2017

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Common misunderstandings in life cycle costing analyses and how to avoid them

van den Boomen, M. (author), Schoenmaker, R. (author), Verlaan, J.G. (author), Wolfert, A.R.M. (author)

LCC analyses (LCCA) and discounting calculations are applied by public sector organizations in the Netherlands. Still numerous misunderstandings can be recognized. An overview is given of some common misunderstandings found in Life Cycle Costing Analyses. Issues relating to public assets are: the absence of residual value, long life cycles, high...

conference paper 2017

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Probabilistic scheduling of offshore operations using copula based environmental time series: An application for cable installation management for offshore wind farms

Leontaris, G. (author), Morales Napoles, O. (author), Wolfert, A.R.M. (author)

There are numerous uncertainties that impact offshore operations. However, environmental uncertainties concerning variables such as wave height and wind speed are crucial because these may affect installation and maintenance operations with potential delays and financial consequences. In order to include these uncertainties into the duration...

journal article 2016

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Wave-Effects in One-Dimensional Elastic Systems Interacting with Moving Objects

Wolfert, A.R.M. (author)

doctoral thesis 1999

document

Steady-State Response of Periodically Supported Structures to a Moving Load

Metrikine, A.V. (author), Wolfert, A.F.M. (author), Vrouwenvelder, A.C.W.M. (author)

Steady-state vibrations of periodically supported structures under a moving load are analytically investigated. The following three structures are considered: an overhead power line for a train, a long suspended bridge and a railway track. The study is based on the application of so-called 'periodicity condition', which implies that the shape of...

journal article 1999