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Retike, Inga (author), Bikše, Jānis (author), Kalvāns, Andis (author), Dēliņa, Aija (author), Avotniece, Zanita (author), Zaadnoordijk, Willem (author), Jemeljanova, Marta (author), Popovs, Konrāds (author), Babre, Alise (author), Zelenkevičs, Artjoms (author), Baikovs, Artūrs (author)Groundwater level time series are of great value for a variety of groundwater studies, particularly for those dealing with the impacts of anthropogenic and climate change. Quality control of groundwater level observations is an essential step prior to any further application, e.g., trend analysis. Often the quality control of data is limited to...journal article 2022
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Bernardi, P. (author), Cantoro, R. (author), Coyette, A. (author), Dobbeleare, W. (author), Fieback, M. (author), Floridia, A. (author), Gielenk, G. (author), Guerriero, A. M. (author), Hamdioui, S. (author)Electronics employed in modern safety-critical systems require severe qualification during the manufacturing process and in the field, to prevent fault effects from manifesting themselves as critical failures during mission operations. Traditional fault models are not sufficient anymore to guarantee the required quality levels for chips...conference paper 2022
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Guo, Y. (author), Jing, Guoqing (author), Markine, V.L. (author)Railway ballast is normally made of crushed rocks with grading (particle size distributions). Ballast is inevitably suffering from more rapid degradation. Because ballast keeps undergoing and dissipating most of the train loadings, furthermore, the train speed and freight weight are increasing, causing more intensive loadings to ballast. To...book chapter 2022
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Veldkamp, Lindsay (author)Impact on composite structures shows a different damage behaviour compared to metal structures. Due to the current short operational life time of composite aircraft the risks of impact damages on composite structures are unknown. This paper proposes a new method for quantitative risk analysis of low velocity impact damages on composite aircraft...master thesis 2021
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Xia, H. (author)The quality control of materials from waste is an important step for acceptance in new high-quality products. Given the large volumes and complexity of waste streams, this requires advanced sensor technology such as the Laser Induced Breakdown Spectroscopy (LIBS) investigated in this thesis. Recyclers often rely solely on manual sorting and...doctoral thesis 2021
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Markhorst, Thomas (author)Proper maintenance and inspection of aircraft and their engines is important for society. These engine inspections are performed using borescopes of which the footage is manually analysed. Having the opportunity to reconstruct a 3D model of the rotors would ease the inspection and introduce the possibility to automate the process. Monocular SLAM...bachelor thesis 2021
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Klein Onstenk, Eduard (author)This paper discusses possible ways to generate synthetic data and its use cases for damage assessment in aircraft turbines. Synthetic data has many advantages such as exact ground truth and scalable data sets. Using SLAM and SfM, which are 3D construction tools, 3D models can be constructed from 2D monocular borescope videos. A 3D reconstruction...bachelor thesis 2021
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Gooijaers, Leo (author)To be able to increase the safety and efficiency of automated wind turbine inspection a robust solution is needed that takes into account wind during trajectory planning. This paper presents such a solution in the form of an algorithm, which uses Dijkstra’s algorithm as a basis for optimisation. To allow for online replanning the horizontal and...master thesis 2021
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Naldini, S. (author), van Hees, R.P.J. (author), van der Grijp, Ernst (author)In the Netherlands a program for the enhancement of quality in the restoration of monumental buildings is presently carried out, stimulated by national authorities and coordinated by the foundation ERM. Guidelines are issued by the branches involved, from architects to masons, under guidance of an experts’ committee, to perform interventions on...conference paper 2021
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Tao, N. (author), Anisimov, A. (author), Groves, R.M. (author)With the increasing application of thick composites in marine, wind energy and aerospace industries, the inspection of thick composites becomes more and more challenging when considering the variety of thick structures (e.g., laminate, sandwich, honeycomb structures). Shearography is a full-field and non-contact optical non-destructive...conference paper 2021
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Andriotis, C. (author), Papakonstantinou, K. G. (author)Determination of inspection and maintenance policies for minimizing long-term risks and costs in deteriorating engineering environments constitutes a complex optimization problem. Major computational challenges include the (i) curse of dimensionality, due to exponential scaling of state/action set cardinalities with the number of components; ...journal article 2021
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Wang, Haoyu (author), Berkers, Jos (author), van den Hurk, Nick (author), Layegh, Nasir Farsad (author)To ensure railway operations safe, track geometry parameters, e.g., track gauge, are usually inspected using track geometry cars. The measurement frequency of track geometry cars is low (twice per year) due to high operational costs and track possession. An innovative way to perform track inspection at high frequency and affordable cost is...journal article 2021
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Daniel, D. (author)Household hygiene is critical to prevent pathogen transmission at the household level. Assessing household hygiene conditions and their determinants are needed to improve hygiene conditions, especially in rural and less developed areas where the housing conditions are relatively worse than they are in urban areas. This study used data from 278...journal article 2021
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Meister, S. (author), Wermes, Mahdieu A.M. (author), Stüve, Jan (author), Groves, R.M. (author)The aerospace industry has established the Automated Fiber Placement process as a common technique for manufacturing fibre reinforced components. In this process multiple composite tows are placed simultaneously onto a tool. Currently in such processes manual testing requires often up to 50% of the manufacturing duration. Moreover, the...review 2021
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van der Voort, H.G. (author), van Bulderen, Sabine (author), Cunningham, Scott (author), Janssen, M.F.W.H.A. (author)The road from data generation to data use is commonly approached as a data-driven, functional process in which domain expertise is integrated as an afterthought. In this contribution we complement this functional view with an institutional view, that takes data analysis and domain professionalism as complementary (yet fallible) knowledge...journal article 2021
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Meister, S. (author), Grundhöfer, Lars (author), Stüve, Jan (author), Groves, R.M. (author)Automated Fibre Placement is a common manufacturing technique for composite parts in the aero-space industry. Therefore, a visual part inspection is required which often covers up to 50% of the actual production time. Moreover, the inspection quality of this manual step fluctuates significantly. A camera-based automated inline inspection is...journal article 2021
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Gatto, Valentina (author), Anisimov, A. (author), Lettinga, W. (author), Tao, N. (author), Lantman, Merel (author), Crijns, Bernice (author), Groves, R.M. (author)Structural delamination in mural paintings is a complex phenomenon and is considered among the most frequent types of damage. In conservation practice, the most common technique to identify structural detachments is the percussion method. Full-field optical techniques based on interferometry, such as shearography, can provide a more...conference paper 2021
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Meister, S. (author), Stüve, Jan (author), Groves, R.M. (author)Automated fibre layup techniques are often applied for the production of complex structural components. In order to ensure a sufficient component quality, a subsequent visual inspection is necessary, especially in the aerospace industry. The use of automated optical inspection systems can reduce the inspection effort by up to 50 %. Laser line...journal article 2021
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Klerk, W.J. (author), Kanning, W. (author), Kok, M. (author), Bronsveld, J. (author), Wolfert, A.R.M. (author)Prioritisation of flood defence maintenance is typically based on visual inspection. However, literature shows that the Probability of Detection (PoD) of visual inspection can vary significantly. Here we investigate the PoD for visual inspections of flood defence structures, the consistency of damage classification, and the influence of...journal article 2021
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Meister, S. (author), Möller, Nantwin (author), Stüve, Jan (author), Groves, R.M. (author)In the aerospace industry, the Automated Fiber Placement process is an established method for producing composite parts. Nowadays the required visual inspection, subsequent to this process, typically takes up to 50% of the total manufacturing time and the inspection quality strongly depends on the inspector. A Deep Learning based...journal article 2021