Searched for: faculty%3AMechanical
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Bannenberg, L.J. (author), Verhoeff, D. (author), Jonckers Newton, Nick (author), Thijs, M.A. (author), Schreuders, H. (author)
Here, we study the structural and optical properties of tetragonal β-tantalum-sputtered thin films both ex situ and when exposed to hydrogen, with a focus on optical hydrogen sensing applications. Using optical transmission measurements, out-of-plane and in-plane X-ray diffraction, and X-ray and neutron reflectometry, we show that thin film β...
journal article 2024
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Tavio Y Cabrera, E.J. (author), Della Santina, C. (author), Borja, Pablo (author)
The compliant nature of soft robots is appealing to a wide range of applications. However, this compliant property also poses several control challenges, e.g., how to deal with infinite degrees of freedom and highly nonlinear behaviors. This paper proposes a hybrid controller for a pneumatic-actuated soft robot. To this end, a model-based...
conference paper 2024
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Boon, M.M. (author), Buntic, I. (author), Ahmed, K. (author), Dopffel, Nicole (author), Peters, C.A. (author), Hajibeygi, H. (author)
Characterization of the microbial activity impacts on transport and storage of hydrogen is a crucial aspect of successful Underground Hydrogen Storage (UHS). Microbes can use hydrogen for their metabolism, which can then lead to formation of biofilms. Biofilms can potentially alter the wettability of the system and, consequently, impact the...
journal article 2024
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van Woerkom, Paul Th.L.M. (author)
De TU Delft heeft in het kader van haar 180-jarig bestaan (1842 – 2022) in oktober 2022 een aantal nieuwe plaquettes geplaatst op haar campus langs de Mekelweg. De locatie wordt aangeduid met “Walk of Fame”. De plaquettes langs deze walk of Fame eren zowel zogenaamde TU Delft “Historische Alumni” en TU Delft “Hedendaagse Alumni”. Hierbij springt...
journal article 2023
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van den Boom, S.J. (author), Abedi, Reza (author), van Keulen, A. (author), Aragon, A.M. (author)
Phononic crystals can be designed to show band gaps—ranges of frequencies whose propagation is strongly attenuated in the material. In essence, their working principle is based on destructive interference of waves reflecting from the periodic arrangement of material interfaces (i.e., Bragg scattering). Consequently, capturing accurately the...
journal article 2023
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Keşkekler, A. (author), Bos, V. (author), Aragon, A.M. (author), Steeneken, P.G. (author), Alijani, F. (author)
Mechanical nonlinearities dominate the motion of nanoresonators already at relatively small oscillation amplitudes. Although single and coupled two-degree-of-freedom models have been used to account for experimentally observed nonlinear effects, it is shown that these models quickly deviate from experimental findings when multiple modes...
journal article 2023
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Delissen, A.A.T.M. (author), van Keulen, A. (author), Langelaar, Matthijs (author)
The design of high-performance mechatronic systems is very challenging, as it requires delicate balancing of system dynamics, the controller, and their closed-loop interaction. Topology optimization provides an automated way to obtain systems with superior performance, although extension to simultaneous optimization of both topology and...
journal article 2023
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Ranjan, R. (author), Langelaar, Matthijs (author), van Keulen, A. (author), Ayas, C. (author)
Computational process modelling of metal additive manufacturing has gained significant research attention in recent past. The cornerstone of many process models is the transient thermal response during the AM process. Since deposition-scale modelling of the thermal conditions in AM is computationally expensive, spatial and temporal...
journal article 2023
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Fokkinga, E.P. (author), Hernandez-Tamames, J.A. (author), Ianus, Andrada (author), Nilsson, Markus (author), Tax, Chantal M.W. (author), Perez-Lopez, Raquel (author), Grussu, Francesco (author)
Diffusion-weighted magnetic resonance imaging (DW-MRI) aims to disentangle multiple biological signal sources in each imaging voxel, enabling the computation of innovative maps of tissue microstructure. DW-MRI model development has been dominated by brain applications. More recently, advanced methods with high fidelity to histology are...
review 2023
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van den Boom, S.J. (author), Zhang, J. (author), van Keulen, A. (author), Aragon, A.M. (author)
The published article contains a mistake in the notation of the strain–displacement matrix (Formula presented.) in Voigt notation concerning the isoparametric mapping and in the notation of the corresponding derivatives. As the mistakes relate only to the notation, and the implementation in the code was done correctly, they bear no...
journal article 2023
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Zhang, L. (author), Zhang, Y. (author), van Keulen, A. (author)
High computational costs are encountered in topology optimization problems of geometrically nonlinear structures since intensive use has to be made of incremental-iterative finite element simulations. To alleviate this computational intensity, reduced-order models (ROMs) are explored in this paper. The proposed method targets ROM bases...
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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Wang, W. (author), van Keulen, A. (author), Wu, J. (author)
Additive manufacturing of metal parts involves phase transformations and high temperature gradients which lead to uneven thermal expansion and contraction, and, consequently, distortion of the fabricated components. The distortion has a great influence on the structural performance and dimensional accuracy, e.g., for assembly. It is therefore...
journal article 2023
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Fečkan, Michal (author), Marynets, K. (author), Wang, J. (author)
We study a boundary value problem for a Caputo-type fractional differential equation subjected to periodic boundary conditions. For an auxiliary problem with the simplified right-hand side, we explicitly construct its unique solution. In addition, based on the theory of the topological index, we prove existence of at least one solution to the...
journal article 2023
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Ranjan, R. (author), Chen, Z. (author), Ayas, C. (author), Langelaar, Matthijs (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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Theulings, M.J.B. (author), Langelaar, Matthijs (author), van Keulen, A. (author), Maas, Robert (author)
Modeling of fluid flows in density-based topology optimization forms a longstanding challenge. Methods based on the Navier–Stokes equations with Darcy penalization (NSDP equations) are widely used in fluid topology optimization. These methods use porous materials with low permeability to represent the solid domain. Consequently, they suffer...
journal article 2023
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Ranjan, R. (author), Ayas, C. (author), Langelaar, Matthijs (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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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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Delissen, A.A.T.M. (author), Boots, Elwin (author), Laro, Dick (author), Kleijnen, Harry (author), van Keulen, A. (author), Langelaar, Matthijs (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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