- document
-
Peters, H.J. (author), Goosen, J.F.L. (author), van Keulen, A. (author)Lightweight vibrating structures (such as flapping wing micro air vehicle (FWMAV) designs) often require some form of control. To achieve controllability, local structural property changes (e.g., damping and stiffness changes) might be induced in an active manner. The stroke-averaged lift force production of a FWMAV wing can be modified by...journal article 2016
- document
-
Wang, Q. (author), Goosen, J.F.L. (author), van Keulen, A. (author)Quasi-steady aerodynamic models play an important role in evaluating aerodynamic performance and conducting design and optimization of flapping wings. The kinematics of flapping wings is generally a resultant motion of wing translation (yaw) and rotation (pitch and roll). Most quasi-steady models are aimed at predicting the lift and thrust...journal article 2016
- document
-
Verbart, A. (author), Langelaar, M. (author), Van Keulen, A. (author)In this paper, we propose a new method for topology optimization with local stress constraints. In this method, material in which a stress constraint is violated is considered as damaged. Since damaged material will contribute less to the overall performance of the structure, the optimizer will promote a design with a minimal amount of damaged...journal article 2015
- document
- van de Ven, Emiel (author), Driessen, Anton (author), van Keulen, A. (author), Langelaar, Matthijs (author) abstract 2015
- document
-
van de Ven, E.A. (author), Hooijkamp, E.C. (author), Langelaar, Matthijs (author), van Keulen, A. (author)Designing transient thermal mechanical systems is a challenging task. Material can have many different functions: it can provide heat capacity, heat conduction, mechanical stiffness or even function as an actuator. Topology optimization can provide the engineer with valuable insight on such a problem. One of the most popular topology...conference paper 2015
- document
-
Picelli, R. (author), Vicente, W.M. (author), Pavanello, R. (author), van Keulen, A. (author)This article presents an evolutionary topology optimization method for mean compliance minimization of structures under design-dependent viscous fluid flow loads. The structural domain is governed by the elasticity equation and the fluid by the incompressible Stokes flow equations. When the modelling of a system consists in the interaction of...conference paper 2015
- document
-
Ma, X (author), Kato, Y (author), van Kempen, F.C.M. (author), Hirai, Y (author), Tsuchiya, T (author), van Keulen, A. (author), Tabata, O (author)We report a multiple patterning approach utilizing digital-micromirror-device (DMD)-based grayscale lithography, providing a solution to improve fabrication accuracy for entire target three-dimensional structure. Because DMD-based lithography system consists a projection lens system, better resolution can be obtained around focal position...conference paper 2015
- document
-
Ma, X (author), Kato, Y (author), Hirai, Y (author), van Kempen, F.C.M. (author), van Keulen, A. (author), Tsuchiya, T (author), Tabata, O (author)Digital Micromirror Device (DMD)-based grayscale lithography is a promising tool for three dimensional (3D) microstructuring of thick-film photoresist since it is a maskless process, provides possibility for the free-form of 3D microstructures, and therefore rapid and cost-effective microfabrication. However, process parameter determination...conference paper 2015
- document
-
Keyvani Janbahan, A. (author), Sadeghian Marnani, H. (author), Goosen, J.F.L. (author), van Keulen, A. (author)The maximum amount of repulsive force applied to the surface plays a very important role in damage of tip or sample in Atomic Force Microscopy(AFM). So far, many investigations have focused on peak repulsive forces in tapping mode AFM in steady state conditions. However, it is known that AFM could be more damaging in transient conditions. In...conference paper 2015
- document
-
Peters, H.J. (author), Tiso, P. (author), Goosen, J.F.L. (author), Van Keulen, A. (author)Several Flapping Wing Micro Air Vehicle (FWMAV) designs exploit structural resonance to decrease power consumption. Practical use of most resonating structures requires temporary modifications to the resonance mode (i.e., the eigensolution). This paper presents a systematic design approach to modify non-proportionally damped resonance modes in a...conference paper 2014
- document
- Goosen, J.F.L. (author), Peters, H.J. (author), Wang, Q. (author), Tiso, P. (author), Van Keulen, A. (author) conference paper 2013
- document
- Wang, Q. (author), Goosen, J.F.L. (author), Van Keulen, A. (author) conference paper 2013
- document
- Peters, H.J. (author), Goosen, J.F.L. (author), Van Keulen, A. (author) conference paper 2013
- document
-
Sadeghian, H. (author), Yang, C.K. (author), Bossche, A. (author), French, P.J. (author), Goosen, J.F.L. (author), Van Keulen, A. (author)A method for determining a spring constant k for a deformable probe element (102) of a scanning probe microscope SPM (100). The probe (102) has an outer surface area consisting of a tip area (112) on a first probe side (108) and a tip-less area (113). The probe (102) also has a probe electrode (114) and a scanning probe tip (104) in the tip area...patent 2012
- document
-
Verbart, A. (author), Langelaar, M. (author), Van Dijk, N. (author), Van Keulen, A. (author)For aeronautical applications of topology optimization, it is of importance to develop topology optimization techniques, that can handle stress constraints in an efficient and accurate manner. The development of such topology optimization techniques is a challenging task due to the local nature of the stress constraints, their highly non-linear...conference paper 2012
- document
-
De Wit, A.J. (author), Van Keulen, A. (author)Multi-level optimization and multi-disciplinary optimization are areas of research that are concerned with developing efficient analysis and optimization techniques for complex systems that are made up of coupled elements (components). Within the field of multilevel optimization and multi-disciplinary optimization a large number of techniques...conference paper 2010
- document
- Lau, G.K. (author), Chu, D.T. (author), Goosen, J.F.L. (author), Van Keulen, A. (author), Sarro, P.M. (author) patent 2008
- document
-
Van Keulen, A. (author), Weustink, A.P.D. (author)A removable spacer device is provided on the mandrel before the product is formed on it. A method for forming a product using a mandrel comprises forming the product on the mandrel and then removing it from the latter. The mandrel is provided with a removable spacer device before the product is formed on it.patent 2004
- document
- Van Keulen, A. (author) doctoral thesis 1993