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Valiya Valappil, S. (author), Goosen, J.F.L. (author), Aragon, A.M. (author)Ultrasonic flowmeters face unique challenges since, in addition to withstanding high fluid pressures, they have to avoid crosstalk, which is the interaction of the signals traveling through the fluid and the solid pipe. To avoid the crosstalk, which leads to poor accuracy or complete loss of the required signal, we develop a mounting...journal article 2024
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Valiya Valappil, S. (author), Goosen, J.F.L. (author), Aragon, A.M. (author)Ultrasonic flowmeters that use transit-time ultrasonic transducers face measurement errors due to 'crosstalk,' whereby the working signal travels through the pipe wall and couplings, interfering with the signal from the fluid. Although various procedures have been proposed to solve the issue of crosstalk, they're limited to low-frequency...journal article 2023
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Valiya Valappil, S. (author), Aragon, A.M. (author), Goosen, J.F.L. (author)Phononic crystal band gaps (BGs), which are realized by Bragg scattering, have a central frequency and width related to the unit cell's size and the impedance mismatch between material phases. BG tuning has generally been performed by either trial and error or by computational tools such as topology optimization. In either case, understanding...journal article 2023
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Pärnamäe, Ragne (author), Gurreri, Luigi (author), Post, Jan (author), van Egmond, Willem Johannes (author), Culcasi, Andrea (author), Saakes, Michel (author), Cen, Jiajun (author), Goosen, Emil (author), Vermaas, D.A. (author)The increasing share of renewables in electric grids nowadays causes a growing daily and seasonal mismatch between electricity generation and demand. In this regard, novel energy storage systems need to be developed, to allow large-scale storage of the excess electricity during low-demand time, and its distribution during peak demand time....journal article 2020
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van Bergen, Thibaut (author), Ishiyama, Rui (author), Makino, Kengo (author), Kudo, Yuta (author), Takahashi, Toru (author), Goosen, J.F.L. (author)This paper presents a novel framework and its prototype tool for indexing and retrieving specific fragments of voice recordings obtained during discussions about physical objects such as text documents, pictures, or 3D models. When a specific part of an object is mentioned, it is tagged with an ink dot that is immediately registered in a...conference paper 2019
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Keyvani Janbahan, A. (author), Tamer, M.S. (author), van Wingerden, J.W. (author), Goosen, J.F.L. (author), van Keulen, A. (author)Many investigations have focused on steady-state nonlinear dynamics of cantilevers in tapping mode atomic force microscopy (TM-AFM). However, a transient dynamic model—which is essential for a model-based control design—is still missing. In this paper, we derive a mathematical model which covers both the transient and steady-state behavior....journal article 2019
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Sajadi, B. (author), Goosen, J.F.L. (author), van Keulen, A. (author)Electrostatic instability is one of the main features of many electrostatic MEMS and NEMS devices. In this paper, we investigate how the electrostatic instability of a plate-like electrode can be affected by a differential pressure. The results of this study indicate that the presence of differential pressure can have a significant influence...journal article 2018
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Keyvani Janbahan, A. (author), Sadeghian, Hamed (author), Goosen, J.F.L. (author), van Keulen, A. (author)The origin of amplitude reduction in Tapping Mode Atomic Force Microscopy (TM-AFM) is typically attributed to the shift in resonance frequency of the cantilever due to the nonlinear tip-sample interactions. In this paper, we present a different insight into the same problem which, besides explaining the amplitude reduction mechanism, provides...journal article 2018
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Sajadi, B. (author), Goosen, J.F.L. (author), van Keulen, A. (author)The electrostatic instability (pull-in) of a flat electrode in a parallel plate capacitor has been shown to be highly sensitive to external mechanical loads such as pressure. In this paper, we substantiate the possibility of prompting additional unstable configurations in such a system, with a remarkable sensitivity to the applied pressure....journal article 2017
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Wang, Q. (author), Goosen, J.F.L. (author), van Keulen, A. (author)Spanwise twist can dominate the deformation of flapping wings and alters the aerodynamic performance and power efficiency of flapping wings by changing the local angle of attack. Traditional Fluid–Structure Interaction (FSI) models, based on Computational Structural Dynamics (CSD) and Computational Fluid Dynamics (CFD), have been used to...journal article 2017
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Wang, Q. (author), Goosen, J.F.L. (author), van Keulen, A. (author)Flapping wings can pitch passively about their pitching axes due to their flexibility, inertia, and aerodynamic loads. A shift in the pitching axis location can dynamically alter the aerodynamic loads, which in turn changes the passive pitching motion and the flight efficiency. Therefore, it is of great interest to investigate the optimal...journal article 2017
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Keyvani Janbahan, A. (author), Sadeghian Marnani, H. (author), Tamer, M.S. (author), Goosen, J.F.L. (author), van Keulen, A. (author)Due to the harmonic motion of the cantilever in Tapping Mode Atomic Force Microscopy, it is seemingly impossible to estimate the tip-sample interactions from the motion of the cantilever. Not directly observing the interaction force, it is possible to damage the surface or the tip by applying an excessive mechanical load. The tip-sample...journal article 2017
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Sajadi, B. (author), Goosen, J.F.L. (author), van Keulen, A. (author)Surface stress-based measurement is a relatively new mechanism in biological and chemical sensing. The viability of this mechanism depends on the maximum sensitivity, accuracy, and precision that can be achieved with these sensors. In this paper, an analytical approximate solution and a finite-element model are employed to describe the...journal article 2017
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- Sajadi, B. (author), Goosen, J.F.L. (author), van Keulen, A. (author) journal article 2017
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Sajadi, B. (author), Alijani, F. (author), Goosen, J.F.L. (author), van Keulen, A. (author)Characterization of nonlinear behavior of micro-mechanical components in MEMS applications plays an important role in their design process. In this paper, nonlinear dynamics, stability and pull-in mechanisms of an electrically actuated circular micro-plate subjected to a differential pressure are studied. For this purpose, a reduced-order...journal article 2017
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Keyvani Janbahan, A. (author), Alijani, F. (author), Sadeghian, Hamed (author), Maturova, Klara (author), Goosen, J.F.L. (author), van Keulen, A. (author)This paper investigates the closed-loop dynamics of the Tapping Mode Atomic Force Microscopy using a new mathematical model based on the averaging method in Cartesian coordinates. Experimental and numerical observations show that the emergence of chaos in conventional tapping mode AFM strictly limits the imaging speed. We show that, if the...journal article 2017
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Sajadi, B. (author), Alijani, F. (author), Davidovikj, D. (author), Goosen, J.F.L. (author), Steeneken, P.G. (author), van Keulen, A. (author)In the last decade, graphene membranes have drawn tremendous attention due to their potential application in Nano-Electro-Mechanical Systems. In this paper, we show that the frequency response curves of graphene resonators are powerful tools for their dynamic characterization and for extracting their equivalent Young's modulus. For this purpose,...journal article 2017
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- Tamer, M.S. (author), Sadeghian Marnani, H. (author), Keyvani Janbahan, A. (author), Goosen, J.F.L. (author), van Keulen, A. (author) abstract 2016
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- Keyvani, A. (author), Sadeghian, H. (author), Goosen, J.F.L. (author), van Keulen, A. (author) abstract 2016
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- Sajadi, B. (author), Goosen, J.F.L. (author), van Keulen, A. (author) abstract 2016