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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
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Wang, Q. (author), Goosen, J.F.L. (author), Van Keulen, F. (author)As one of the most important components of a flapping-wing micro air vehicle (FWMAV), the design of an energy-efficient flapping-wing has been a research interest recently. Research on insect flight from different perspectives has been carried out, mainly with regard to wing morphology, flapping kinematics, and unsteady aerodynamics. However,...conference paper 2014
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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
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- Goosen, J.F.L. (author), Peters, H.J. (author), Wang, Q. (author), Tiso, P. (author), Van Keulen, A. (author) conference paper 2013
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- Wang, Q. (author), Goosen, J.F.L. (author), Van Keulen, A. (author) conference paper 2013
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- Peters, H.J. (author), Goosen, J.F.L. (author), Van Keulen, A. (author) conference paper 2013
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Sadeghian, H. (author), Van Keulen, F. (author), Goosen, H. (author)Nowadays, mechanical designers and engineers of elastic structures at ultra-small scales face an interesting challenge; traditional flexures with several components, mechanical joints/ welds and linkages are almost impossible to manufacture with existing microsystem fabrication technologies. Therefore, the majority of mechanical components,...book chapter 2013
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Suarez, D.R. (author), Weinans, H. (author), Van Keulen, F. (author)Post-operative change in the mechanical loading of bone may trigger its (mechanically induced) adaptation and hamper the mechanical stability of prostheses. This is especially important in cementless components, where the final fixation is achieved by the bone itself. The aim of this study is, first, to gain insight into the bone remodelling...journal article 2012
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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
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Sadeghian, H. (author), Goosen, H. (author), Bossche, A. (author), Thijsse, B. (author), Van Keulen, F. (author)Recent measurements have indicated that the elastic behaviour of silicon nanocantilevers and nanowires is size-dependent. Several theoretical models have been proposed to explain this phenomenon, mainly focused on surface stress effects. However, discrepancies are found between experiments and theories, indicating that there could be other...journal article 2011
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Sadeghian, H. (author), Yang, C.K. (author), Gavan, K.B. (author), Goosen, J.F.L. (author), Van der Drift, E.W.J.M. (author), Van der Zant, H.S.J. (author), Bossche, A. (author), French, P.J. (author), Van Keulen, F. (author)Micro/nano resonant cantilevers with a laser deflection readout have been very popular in sensing applications over the past years. Despite the popularity, however, most of the research has been devoted to increasing the sensitivity, and very little attention has been focused on effects-induced errors. Among these effects, the surface effects...journal article 2010
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Sadeghian, H. (author), Yang, C.K. (author), Goosen, J.F.L. (author), Bossche, A. (author), Staufer, U. (author), French, P.J. (author), Van Keulen, F. (author)The size-dependent elastic behavior of silicon nanocantilevers and nanowires, specifically the effective Young’s modulus, has been determined by experimental measurements and theoretical investigations. The size dependence becomes more significant as the devices scale down from micro- to nano-dimensions, which has mainly been attributed to...journal article 2010
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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
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Van Dijk, N.P. (author), Yoon, G.H. (author), Van Keulen, F. (author), Langelaar, M. (author)This contribution presents a novel and versatile approach to geometrically nonlinear topology optimization by combining the level-set method with the element connectivity parameterization method or ECP. The combined advantages of both methods open up the possibility to treat a wide range of optimization problems involving complex physical and/or...journal article 2010
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Mackay, J.R. (author), Van Keulen, F. (author)A review of conventional testing methods for applying external hydrostatic pressure to buckling-critical shells is presented. A new “volume-control” pressure testing method, aimed at preventing catastrophic specimen failures and improving control of specimen deformation near the critical load, is also introduced. The implementation of...journal article 2009
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Sadeghian, H. (author), Goosen, J.F.L. (author), Bossche, A. (author), Van Keulen, F. (author)In this letter, the dominant role of surface stress and surface elasticity on the overall elastic behavior of ultrathin cantilever plates is studied. A general framework based on two-dimensional plane-stress analysis is presented. Because of either surface reconstruction or molecular adsorption, there exists a surface stress and a surface...journal article 2009
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Sadeghian, H. (author), Yang, C.K. (author), Goosen, J.F.L. (author), Van der Drift, E. (author), Bossche, A. (author), French, P.J. (author), Van Keulen, F. (author)This letter presents the application of electrostatic pull-in instability to study the size-dependent effective Young’s Modulus ? ( ~170–70?GPa) of [110] silicon nanocantilevers (thickness ~1019–40?nm). The presented approach shows substantial advantages over the previous methods used for characterization of nanoelectromechanical systems...journal article 2009
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Bolsman, C.T. (author), Goosen, J.F.L. (author), Van Keulen, F. (author)In this paper, we illustrate and study the opportunities of resonant ring type structures as wing actuation mechanisms for a flapping wing Micro Air Vehicle (MAV). Various design alternatives are presented and studied based on computational and physical models. Insects provide an excellent source of inspiration for the development of the wing...conference paper 2008
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Lau, G.K. (author), Goosen, J.F.L. (author), Duc, T.C. (author), Van Keulen, F. (author)This paper presents an overview of a new type of thermal micro-actuators using thermally expandable polymers with embedded skeletons. Embedding a stiff skeleton enhances the actuation capability of the thermally expandable polymer. Consequently, the skeleton-reinforced polymers feature a large maximum actuation stress (often above 100 MPa) and a...conference paper 2008
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Sadeghian, H. (author), Goosen, J.F.L. (author), Bossche, A. (author), Van Keulen, F. (author)Submicron cantilever structures have been demonstrated to be extremely versatile sensors and have potential applications in physics, chemistry and biology. The basic principle in submicron cantilever sensors is the measurement of the resonance frequency shift due to the added mass of the molecules bound to the cantilever surface. This paper...conference paper 2008
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