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De Gooijer-van de Groep, K.L. (author), De Vlugt, E. (author), De Groot, J.H. (author), Van der Heijden-Maessen, H.C.M. (author), Wielheesen, D.H.M. (author), Van Wijlen-Hempel, R.M.S. (author), Arendzen, J.H. (author), Meskers, C.G.M. (author)Background Spastic paresis in cerebral palsy (CP) is characterized by increased joint stiffness that may be of neural origin, i.e. improper muscle activation caused by e.g. hyperreflexia or non-neural origin, i.e. altered tissue viscoelastic properties (clinically: “spasticity” vs. “contracture”). Differentiation between these components is hard...journal article 2013
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Topology optimization of the compliant underactuated finger with the focus on out-of-plane stiffnessGoemans, V.Y. (author)For large-displacement mechanisms, such as underactuated fingers, the out-of-plane stiffness can pose problems, especially as it tends to vary over the in-plane range of motion. In this paper a method is presented to design compliant underactuated fingers using topology optimization with a focus on obtaining a desired out-of-plane stiffness...master thesis 2013
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Helgadottir, A. (author)Offset muscle activation is the constant neural firing to muscles, even at rest, defining the minimum muscle contraction. Until now, the offset muscle activation has been neglected in the analysis of the dynamical behavior of joints. There is a clinical need for an assessment method to estimate the contribution of the offset muscle activation to...master thesis 2013
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Verbakel, F. (author)This study proposes an ankle-foot orthosis (AFO) based on a novel concept to compensate increased ankle joint stiffness by adding negative stiffness to the joint. The negative stiffness working principle is a mechanism consisting of a spring generating force around a rotation axis, with a variable moment arm. The spring force is decreasing, when...master thesis 2013
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Derks, L. (author)Introduction: Paresis in UMND patients leads to immobilization and disuse of the ankle joint. As a result, secondary changes such as increased passive stiffness and plastic CNS rearrangements aggravate the paresis. We propose an intervention that compensates the passive stiffness, enabling the remaining muscle force to initialize movement to...master thesis 2013
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Angeluova, G.V. (author)Introduction: Obstetric Brachial Plexus Lesion (OBPL) is characterized by diminished motor and sensory function. These may be worsened by misrouted nerve fibres and faulty formation of central motor programmes. The latter is treated with triceps injections of botulinum toxins, which is aimed at inactivating misrouted nerve fibres in the triceps,...master thesis 2012
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- Knorz, M. (author), Van de Kuilen, J.W.G. (author) conference paper 2012
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Chlosta, M. (author)Considering the recent increase in the use of fiber reinforced polymers in the civil engineering industry in general and in the bridge engineering industry in particular, as well as the recently more and more applied cylindrical truss bridge type, this research focuses on the question whether it is possible to combine fiber reinforced polymers...master thesis 2012
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Hoekstra, T. (author)Today, timber structures are receiving attention more and more. Because of the increasing interest in sustainable construction as well as for other reasons, building industry in Europe is (re)-discovering multi-storey timber structures for construction of mid-rise buildings. In this master’s thesis, an analytical calculation method and modelling...master thesis 2012
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Nagy, A.P. (author)Design optimisation is of paramount importance in most engineering, e.g. aeronautical, automotive, or naval, disciplines. Its interdisciplinary character is manifested in the synthesis of geometric modelling, numerical analysis, mathematical programming, and computer sciences. The evolution of the field is closely related to concomitant advances...doctoral thesis 2011
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Van Campen, J.M.J.F. (author)Advancements in automated fibre-placement (AFP) technology make it possible to take laminate tailoring further than just stacking sequence optimisation; they enable the designer to vary the fibre orientation angle spatially within each ply. Spatial variation of fibre orientation angles results in a variable stiffness (VS) laminate. The work...doctoral thesis 2011
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IJsselmuiden, S.T. (author)Fiber reinforced composite materials have gained widespread acceptance for a multitude of applications in the aerospace, automotive, maritime and wind-energy industries. Automated fiber placement technologies have developed rapidly over the past two decades, driven primarily by a need to reduce manufacturing costs and improve product consistency...doctoral thesis 2011
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Dunning, A.G. (author)This paper presents the first zero stiffness six degrees of freedom (DoF) compliant precision stage. To deal with problems like backlash, friction and lubrication for performing ultra-precise positioning in a vacuum environment, a novel compliant structure is proposed. All six degrees of freedom are statically balanced (i.e. near zero stiffness)...master thesis 2011
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Lawand, N.S. (author), French, P.J. (author), Briare, J.J. (author), Frijns, J.H.M. (author)Cochlear implants work on the principle of direct electrical stimulation of the auditory nerve. It has advantages to replace their traditional wired electrodes by a high-density thin-film multielectrode stimulation array which is relatively small in dimensions, stable, resistant to electrolysis, and offers batch fabrication capabilities with...journal article 2011
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De Vlugt, E. (author), Van Eesbeek, S. (author), Baines, P. (author), Hilte, J. (author), Meskers, C.G.M. (author), De Groot, J.H. (author)Muscles behave as elastic springs during the initial strain phase, indicated as short range stiffness (SRS). Beyond a certain amount of strain the muscle demonstrates a more viscous behavior. The strain at which the muscle transits from elastic- to viscous-like behavior is called the elastic limit and is believed to be the result of breakage of...journal article 2011
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Pessers, R.A.W. (author)This thesis discusses the design of a new steerable tip for a laparoscopic instrument. A new tip design is required since current steerable tip designs have problems with the bending stiffness and the lifespan of the cables. Underaction is a main cause of the low tip stiffness. Since one of the design requirements is that the tip needs to be...master thesis 2011
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Rosenbrand, D.M. (author)Endpoint stiffness is known to increase in the direction of instability during learning to accurately execute unstable motor tasks. Reflexes might be present in the time interval used for endpoint stiffness calculations suggesting a possible influence of reflexes on endpoint stiffness measurements. In addition, changes of reflexes during motor...master thesis 2011
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Van der Greft, I.D. (author)A bi-phasic force response is found in muscle stretch. Force response is high at the start of the stretch and drops at certain length. The high initial force response is referred to as Short Range Stiffness and the moment at which the force response drops is referred to as the elastic limit. It is likely that this bi-phasic torque response is...master thesis 2011
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- Fagiano, C. (author) doctoral thesis 2010
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Blom, A.W. (author)The use of fiber-reinforced composites in aerospace structures has increased dramatically over the past decades. The high specific strength and stiffness, the tailorability, and the possibilities to integrate parts and reduce the number of fasteners give composites an advantage over metals. Automation of the production process enables large...doctoral thesis 2010