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Ranjan, R. (author), Chen, Z. (author), Ayas, C. (author), Langelaar, M. (author), van Keulen, A. (author)Overheating is a major issue especially in metal Additive Manufacturing (AM) processes, leading to poor surface quality, lack of dimensional precision, inferior performance and/or build failures. A 3D density-based topology optimization (TO) method is presented which addresses the issue of local overheating during metal AM. This is achieved...journal article 2023
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Li, Z. (author), Xu, M. (author), Norte, R.A. (author), Aragon, A.M. (author), van Keulen, A. (author), Alijani, F. (author), Steeneken, P.G. (author)In recent years, the Q-factor of Si 3 N 4 nanomechanical resonators has significantly been increased by soft-clamping techniques using large and complex support structures. To date, however, obtaining similar performance with smaller supports has remained a challenge. Here, we make use of torsion beam supports to tune the Q-factor of Si 3 N 4...journal article 2023
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Ranjan, R. (author), Ayas, C. (author), Langelaar, M. (author), van Keulen, A. (author)A novel constraint to prevent local overheating is presented for use in topology optimization (TO). The very basis for the constraint is the Additive Manufacturing (AM) process physics. AM enables fabrication of highly complex topologically optimized designs. However, local overheating is a major concern especially in metal AM processes...journal article 2022
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Hendrikse, H. (author), Hammer, T.C. (author), van den Berg, M.A. (author), Willems, Tom (author), Owen, C.C. (author), van Beek, C. (author), Ebben, Nick J.J. (author), Puolakka, Otto (author), Polojärvi, Arttu (author)Basin tests were performed at the Aalto Ice Tank to gather data on ice-structure action and interaction from ice failing against a vertically sided cylindrical pile. The tests were performed with a real-time hybrid test setup, which combined physical and numerical components to simulate a range of test structures in real-time. The dataset...journal article 2022
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Mishra, V. (author), Ayas, C. (author), Langelaar, M. (author), van Keulen, A. (author)Topology optimization typically generates designs that exhibit significant geometrical complexity, which can pose difficulties for manufacturing and assembly. The number of occurrences of an important design feature, in particular intersections, increases with geometrical complexity. Intersections are essential for load transfer in many...journal article 2022
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van Driel, W.D. (author), Jacobs, B.M.M. (author), Onushkin, G. (author), Watte, P. (author), ZHAO, X. (author), Davis, J. Lynn (author)Reliability is an essential scientific and technological domain intrinsically linked with system integration. Nowadays, semiconductor industries are confronted with ever-increasing design complexity, dramatically decreasing design margins, increasing chances for and consequences of failures, shortening of product development and qualification...book chapter 2022
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Novgorodcev Junior, André Reinaldo (author), Mols, F. (author), Jarquin Laguna, A. (author)This article presents a preliminary assessment of a subsea buoyancy and gravity energy storage system (SBGESS). The storage device is designed to power an off-grid subsea water injection system to be installed at the Libra oil field in Brazil at 2000 m below sea level. Two 12MW floating wind turbines provide the energy supply. The system...conference paper 2022
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Jongeneel, Alyssa (author), Libedinsky, Ilan (author), Reinbergen, Anouk (author), Tromp, N. (author), Delespaul, Philippe (author), Riper, Heleen (author), van der Gaag, Mark (author), van den Berg, D.A. (author)Background: Temstem is a mobile application developed in cooperation with voice-hearing persons to help them cope with distressing voices. After psychoeducation about voice hearing, Temstem offers two functions: Silencing is a mode designed to inhibit voice activity through the processing of incompatible language; the Challenging mode...journal article 2022
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Coolen, R.J.J. (author), Emmer, K.M. (author), Spantidea, P.I. (author), Asselt, E. van (author), Scheepe, J.R. (author), Serdijn, W.A. (author), Blok, B.F.M. (author)The first two objectives were to establish which stimulation parameters of kilohertz frequency alternating current (KHFAC) neuromodulation influence the effectiveness of pudendal nerve block and its safety. The third aim was to determine whether KHFAC neuromodulation of the pudendal nerve can relax the pelvic musculature, including the anal...journal article 2022
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van Rooijen, W.A. (author), Habibi, P. (author), Xu, K. (author), Dey, P. (author), Vlugt, T.J.H. (author), Hajibeygi, H. (author), Moultos, O. (author)Data for several key thermodynamic and transport properties needed for technologies using hydrogen (H<sub>2</sub>), such as underground H<sub>2</sub> storage and H<sub>2</sub>O electrolysis are scarce or completely missing. Force field-based Molecular Dynamics (MD) and Continuous Fractional Component Monte Carlo (CFCMC) simulations are...journal article 2022
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Delissen, A.A.T.M. (author), Boots, Elwin (author), Laro, Dick (author), Kleijnen, Harry (author), van Keulen, A. (author), Langelaar, M. (author)The design of high-precision motion stages, which must exhibit high dynamic performance, is a challenging task. Manual design is difficult, time-consuming, and leads to sub-optimal designs that fail to fully exploit the extended geometric freedom that additive manufacturing offers. By using topology optimization and incorporating all...journal article 2022
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Giele, R.J.P. (author), van Keulen, A. (author), Langelaar, M. (author)Topology optimization methods improve the structural performance of components. However, in food processing, medical, high-precision, and other industries' designs should also fulfil the requirement of being cleanable. An important aspect of cleanability is drainability, which entails that fluids can always run off the structure under just...journal article 2022
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Moghaddam, E.M.C. (author), Foumeny, E.A. (author), Stankiewicz, A.I. (author), Padding, J.T. (author)This paper investigates the validity of azimuthal averaging of 3D temperature fields in the analysis of lateral heat transfer in dense particle packings. This is conducted by synthetic generation of 3D packing surrogates of spheres, cylinders and Raschig rings with tube-to-pellet diameter ratio, 3 < N < 6, using an in-house Rigid Body...journal article 2021
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Ummels, R. (author), Castro, Saullo G.P. (author)Recent research on variable stiffness laminates have shown both numerically and experimentally that further improvement on the buckling performance is possible by incorporating overlaps that result in variable thickness profiles. We present the concept of overlap-stiffened designs that take advantage of the non-linear coupling between the tow...journal article 2021
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den Boer, E. (author), Wulff, Jörg (author), Mäder, UIf (author), Engwall, Erik (author), Bäumer, Christian (author), Perko, Z. (author), Timmermann, Beate (author)Purpose: Pencil beam scanning (PBS) for moving targets is known to be impacted by interplay effects. Four-dimensional computed tomography (4DCT)-based motion evaluation is crucial for understanding interplay and developing mitigation strategies. Availability of high-quality 4DCTs with variable breathing traces is limited. Purpose of this work...journal article 2021
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de Goederen, R. (author), Pu, S. (author), Silos Viu, M. (author), Doan, D. (author), Overeem, S. (author), Serdijn, W.A. (author), Joosten, K. F.M. (author), Long, X. (author), Dudink, J. (author)Study objectives: Unobtrusive monitoring of sleep and sleep disorders in children presents challenges. We investigated the possibility of using Ultra-Wide band (UWB) radar to measure sleep in children. Methods: Thirty-two children scheduled to undergo a clinical polysomnography participated; their ages ranged from 2 months to 14 years. During...journal article 2021
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Tsolakis, A. (author), Keviczky, T. (author)Nonholonomic mechanical systems encompass a large class of practically interesting robotic structures, such as wheeled mobile robots, space manipulators, and multi-fingered robot hands. However, few results exist on the cooperative control of such systems in a generic, distributed approach. In this work we extend a recently developed...journal article 2021
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Yibole, H. (author), Lingling-Bao, B. (author), Xu, J. (author), Alata, H. (author), Tegus, O. (author), Hanggai, W. (author), van Dijk, N.H. (author), Bruck, E. (author), Guillou, F. (author)While rare-earth magnets exhibit unchallenged hard-magnetic properties, looking for alternatives based on inexpensive elements of non-critical supply remains of utmost interest. Here, we demonstrate that (Fe,Co)<sub>2</sub>(P,Si) single crystals combine a large magnetocrystalline anisotropy (K<sub>1</sub> ≈ 0.9 MJ m<sup>−3</sup> at 300 K),...journal article 2021
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Wang, D. (author), Rueda, José L. (author), Rakhshani, E. (author), van der Meijden, M.A.M.M. (author)Unlike synchronous generators, wind turbines cannot directly respond to large disturbances, which may cause transient instability, due to their power electronic-based interface and maximum power control strategy. To effectively monitor the influence of wind turbines, this paper proposes an approach that combines decision trees (DTs), and a...journal article 2020
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van Woerkom, P.Th.L.M. (author)Joan Muysken, full professor in the Afdeling der Werktuigbouwkunde en Scheepsbouwkunde of the TH Delft 1932-1944 and rector magnificus of the TH Delft in the period 1943 – 1944.report 2020