document

Probabilistic analysis of the Stussi-Kollbrunner paradox

Waarts, P. (author), Vrouwenvelder, A. (author)

In most text books on Plasticity Theory a reference is made to the famous tests performed by Stiissi and Kollbrunner in 1935. The test object was a continuous beam on four supports, loaded by a concentrated point load halfway the central span. According to a straight forward application of the theory of plasticity the load carrying capacity of...

journal article 1997

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Modelling the post-cracking behaviour of steel fibre reinforced concrete for structural design purposes

Kooiman, A.G. (author), Walraven, C. (author)

With the increasing number of applications in practice, the demand for standardised test methods and design rules for Steel Fibre Reinforced Concrete (SFRC) arises. Test methods need to be practical, which means that they have to be relatively cheap and simple to carry out. Design models should be easy to use and reliable. This paper presents a...

journal article 2000

document

Application of statistical methods for making maintenance decisions within power utilities

Jongen, R.A. (author), Morshuis, P.H.F. (author), Gulski, E. (author), Smit, J.J. (author), Maksymiuk, J. (author), Janssen, A.L.J. (author)

journal article 2006

document

Design of a deployment rotation mechanism for microsatellite

Abdelal, G.F. (author), Bakr Elhady, A. (author), Kassab, M. (author)

Solar array rotation mechanism provides a hinged joint between the solar panel and satellite body, smooth rotation of the solar array into deployed position and its fixation in this position. After unlocking of solar panel (while in orbit), rotation bracket turns towards ready-to-work position under the action of driving spring. During...

journal article 2009

document

Modelling the Cost Performance of a Given Logistics Network Operating Under Regular and Irregular Conditions

Janic, M. (author)

This paper develops an analytical model for the assessment of the cost performance of a given logistics network operating under regular and irregular (disruptive) conditions. In addition, the paper aims to carry out a sensitivity analysis of this cost with respect to changes of the most influencing factors. In particular, this is expected to...

journal article 2009

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Safety philosophy for existing structures and partial factors for traffic loads on bridges

Steenbergen, R.D.J.M. (author), Vrouwenvelder, A.C.W.M. (author)

Evaluating and upgrading existing structures becomes more and more important. For a large part of the existing infrastructure and buildings the design life has been reached or will be reached in the near future. These structures need to be reassessed in order to find out whether the safety requirements are met. Not only for new structures but...

journal article 2010

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Reliability and effectiveness of clickthrough data for automatic image annotation

Tsikrika, T. (author), Diou, C. (author), De Vries, A.P. (author), Delopoulos, A. (author)

Automatic image annotation using supervised learning is performed by concept classifiers trained on labelled example images. This work proposes the use of clickthrough data collected from search logs as a source for the automatic generation of concept training data, thus avoiding the expensive manual annotation effort. We investigate and...

journal article 2010

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Sampling duration effects on centre of pressure descriptive measures

Van der Kooij, H. (author), Campbell, A.D. (author), Carpenter, M.G. (author)

The different measures used to characterize postural sway are sensitive to variations in sampling duration, yet there remains marked variability and a lack of consistency in this temporal parameter when compared between studies. We investigated the effect of sampling duration on 22 commonly used frequency and time domain measures and stabilogram...

journal article 2011

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Safety assessment of existing highway bridges and viaducts

Maljaars, J. (author), Steenbergen, R. (author), Abspoel, L. (author), Kolstein, M.H. (author)

The assessment of the structural safety of existing br idges and viaducts becomes increasingly important in many countries owing to an increase in traffic loads. Most existing standards, however, are developed for the design of new structures. For this reason, an assessment method for determining the actual safety level of highway bridges and...

journal article 2012

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A framework for robustness analysis of road networks for short term variations in supply

Snelder, M. (author), Van Zuylen, H.J. (author), Immers, L.H. (author)

There is a growing awareness that road networks, are becoming more and more vulnerable to unforeseen disturbances like incidents and that measures need to be taken in order to make road networks more robust. In order to do this the following questions need to be addressed: How is robustness defined? Against which disturbances should the network...

journal article 2012

document

A Review of Methods to Increase the Availability of Wind Turbine Generator Systems

Shipurkar, U. (author), Polinder, H. (author), Ferreira, Jan Abraham (author)

Availability is an important factor to be considered when designing wind turbine generator systems. The quest for increasing availability is based on the following five design approaches - design for component reliability, active control for reliability, design for fault tolerance, prognostics, and design for maintainability. This paper reviews...

journal article 2016

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Reduction of slope stability uncertainty based on hydraulic measurement via inverse analysis

Vardon, P.J. (author), Liu, K. (author), Hicks, M.A. (author)

The determination of slope stability for existing slopes is challenging, partly due to the spatial variability of soils. Reliability-based design can incorporate uncertainties and yield probabilities of slope failure. Field measurements can be utilised to constrain probabilistic analyses, thereby reducing uncertainties and generally reducing...

journal article 2016

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Optimizing preventive maintenance policy: A data-driven application for a light rail braking system

Corman, F. (author), Kraijema, S. (author), Godjevac, M. (author), Lodewijks, G. (author)

This article presents a case study determining the optimal preventive maintenance policy for a light rail rolling stock system in terms of reliability, availability, and maintenance costs. The maintenance policy defines one of the three predefined preventive maintenance actions at fixed time-based intervals for each of the subsystems of the...

journal article 2017

document

Effects of Graphene Monolayer Coating on the Optical Performance of Remote Phosphors

Yazdan Mehr, M. (author), Vollebregt, S. (author), van Driel, W.D. (author), Zhang, Kouchi (author)

A graphene monolayer has been successfully coated on one side of a bisphenol-A-polycarbonate (BPA-PC) plate, used as a substrate for remote phosphor applications in light-emitting diode (LED)-based products. Using a photoresist transferring method, graphene sheet has been coated on BPA-PC plates. The results show that this graphene monolayer...

journal article 2017

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A Reliability Prediction for Integrated LED Lamp with Electrolytic Capacitor-Free Driver

Sun, B. (author), Fan, Xuejun (author), Li, Lei (author), Ye, H. (author), van Driel, W.D. (author), Zhang, Kouchi (author)

This paper studies the interaction of catastrophic failure of the driver and LED luminous flux decay for an integrated LED lamp with an electrolytic capacitor-free LED driver. Electronic thermal simulations are utilized to obtain the lamp's dynamic history of temperature and current for two distinct operation modes: constant current mode (CCM...

journal article 2017

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Developments in the management of flood defences and hydraulic infrastructure in the Netherlands

Jonkman, Sebastiaan N. (author), Voortman, H.G. (author), Klerk, W.J. (author), van Vuren, S. (author)

This article highlights recent developments in flood risk management in the Netherlands and presents approaches for reliability analysis and asset management for flood defences and hydraulic infrastructure. The functioning of this infrastructure is of great importance for the country as large parts of it are prone to flooding. Based on a...

journal article 2018

document

Material Property Changes in Defects Caused by Reverse Bias Exposure of CIGS Solar Cells

Bakker, N.J. (author), Åhman, Hanna Nilsson (author), Aantjes, Kees (author), Barreau, Nicolas (author), Weeber, A.W. (author), Theelen, Mirjam (author)

Partial shading of Cu(In,Ga)Se₂ modules can lead to the formation of reverse bias induced wormlike defects. These wormlike defects act as local shunts and permanently decrease module output. A good understanding of the formation and propagation mechanisms of these defects is needed in order to mitigate the negative effects, or to...

journal article 2019

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Improving reliability and safety of airborne wind energy systems

Salma, V. (author), Friedl, F. (author), Schmehl, R. (author)

Airborne wind energy systems use tethered flying devices to harvest wind energy beyond the height range accessible to tower-based wind turbines. Current commercial prototypes have reached power ratings of up to several hundred kilowatts, and companies are aiming at long-term operation in relevant environments. As consequence, system...

journal article 2019

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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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Testing the Validity and Reliability of an Instrument Measuring Engineering Students' Perceptions of Transversal Competency Levels

Leandro Cruz, M. (author), van den Bogaard, M.E.D. (author), Saunders-Smits, Gillian (author), Groen, W.A. (author)

Contribution: This study reports on a reliable and valid instrument that measures engineering students' perceptions of their competency levels. A better understanding of students' needs in engineering curricula will support the development of engineering students' transversal competencies. Background: Prior research has investigated how...

journal article 2020