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Sabbadini, A. (author)Diastolic heart failure is one of the principal causes of death in Western countries, and there is currently no treatment available; prevention, on the other hand, may be possible, provided an early enough diagnosis. The worsening of diastolic functionality is associated with increased values of cardiac stiffness, which could therefore provide a...doctoral thesis 2021
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Sonneveld, Dave (author)Compliant joints have significant advantages compared to rigid-body hinges due to a monolithic design and the absence of friction, which prevents effects like wear, backlash and stick-slip behaviour. However, the loading capability is often limited and the support stiffness generally decreases during rotation, caused by the use of solid leaf...master thesis 2021
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Roozendaal, Tjark (author)This report concerned the development of a soft robotic module for a seat pan, its optimization and application. The soft robotic module has an LED and photosensors for determining the distance of indentation and the passive force created by compressing the foam spring inside. An air pressure sensor is used to determine the active force created...master thesis 2021
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Copier, Rick (author)Objective: this paper aims to evaluate the adhesive and frictional properties of the keratinised epithelium on the adhesive pads of tree frogs. Modeling methods: two modeling methods have been developed. One of these methods involves the implementation of discrete fibres in a relatively compliant material matrix while the other method involves...master thesis 2021
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- Dekens, Jaap (author) master thesis 2021
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Leseman, Gailey (author)Many patients with an upper-limb deficiency choose not to wear their prosthetic devices due to a multitude of reasons, including physical discomfort and unintuitive, cognitively demanding control methods. A new haptic interface was developed combining the desirable control characteristics of body-powered control prostheses with the comfort of an...master thesis 2021
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Verheijen, Daan (author)When inserting a flexible endoscope into a human colon during colonoscopy, limitations in the endoscope design can cause medical implications such as excessive colon stretching and buckling of the endoscope shaft. This thesis proposes a novel propulsion mechanism design for flexible endoscopes which changes the method of insertion as a way to...master thesis 2021
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van de Wetering, Erik (author)In the field of vibration energy harvesting, vibration energy is tranduced to electrical energy to power small, low powered devices. Many energy harvesters are produced in the form of a resonator, where resonant amplification enables efficient operation of the energy harvester. At low frequencies below 10 hz, input motions quickly increase for a...master thesis 2021
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Numić, Armin (author)Bistable vibration energy harvesters are an interesting alternative to their linear counterparts. They allow for large amplitude oscillations between their stable equilibria, from which much energy can be generated. However, the stable equilibria are separated by a potential energy barrier that has to be overcome. Therefore, we cannot guarantee...master thesis 2021
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Haegens, Tobias (author)This research focuses on the possible causes of variation in the tensile strength and stiffness of witness specimens that are used in the manufacturing of aerospace grade selective laser sintered parts. Using specimens and data obtained from Materialise of the PA2241FR samples, the crystallinity and porosity of the samples was determined. The...master thesis 2021
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Cop, Christopher P. (author), Cavallo, Gaia (author), van'T Veld, Ronald C. (author), Koopman, Bart F.J.M. (author), Lataire, John (author), Schouten, A.C. (author), Sartori, Massimo (author)In vivo joint stiffness estimation during time-varying conditions remains an open challenge. Multiple communities, e.g. system identification and biomechanics, have tackled the problem from different perspectives and using different methods, each of which entailing advantages and limitations, often complementary. System identification...review 2021
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Kluge, C. (author), Blöcher, Guido (author), Hofmann, Hannes (author), Barnhoorn, A. (author), Schmittbuhl, Jean (author), Bruhn, D.F. (author)The hydraulic performance and mechanical stability of open fractures are crucial for several subsurface applications including fractured geothermal reservoirs or nuclear waste repositories. Their hydraulic and mechanical properties (fluid flow and fracture stiffness) are both strongly dependent on the fracture geometry. Any change in...journal article 2021
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Vertonghen, L. (author), Castro, Saullo G.P. (author)Previous research has hinted on further improvements of the buckling behaviour of variable-stiffness laminates by incorporating overlaps, resulting in a variable thickness profile that is non-linearly coupled to the steering angles. The present study compares two modelling strategies to consider the variable thickness distribution: 1) as...journal article 2021
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Mirra, M. (author), Ravenshorst, G.J.P. (author), van de Kuilen, J.W.G. (author)In-plane behavior of timber diaphragms is usually characterized by means of an equivalent shear stiffness. However, this value depends on how the stiffness of the floors is evaluated from the experimental tests. Although an increasing number of research studies have provided a deeper insight into the seismic characterization of as-built and...journal article 2021
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van de Wetering, E. (author), Blad, Thijs (author), van Ostayen, R.A.J. (author)In this work, a stiffness compensated piezoelectric vibration energy harvester is modelled and tested for low-frequency excitations and large input amplitudes. Attracting magnets are used to introduce a negative stiffness that counteracts the stiffness of the piezoelectric beam. This results into a nearly statically balanced condition and...journal article 2021
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Shen, C. (author), Dollevoet, R.P.B.J. (author), Li, Z. (author)We propose to combine a physics-based finite element (FE) track model and a data-driven Gaussian process regression (GPR) model to directly infer railpad and ballast stiffness from measured frequency response functions (FRF) by field hammer tests. Conventionally, only the rail resonance and full track resonance are used as the FRF features to...journal article 2021
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Analysis of Railway Ballasted Track Stiffness and Behavior with a Hybrid Discrete-Continuum ApproachShi, Can (author), Zhao, Chunfa (author), Yang, Yang (author), Guo, Y. (author), Zhang, Xu (author)Railway ballasted track stiffness is an important indicator to identify supporting condition that ensures that the facility is well designed and functioned. Although many studies have been performed on track stiffness based on experimental tests and finite-element methods, the factors influencing the track stiffness have not been completely...journal article 2021
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Doornebosch, Luuk Maria (author), Abbink, D.A. (author), Peternel, L. (author)Tele-impedance augments classic teleoperation by enabling the human operator to actively command remote robot stiffness in real-time, which is an essential ability to successfully interact with the unstructured and unpredictable environment. However, the literature is missing a study on benefits and drawbacks of different types of stiffness...journal article 2021
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Kok, Sjaak (author), Radaelli, G. (author), Amoozandeh, A. (author), Herder, J.L. (author)Elastic neutral stability in compliant mechanisms is a remarkable appearance since it requires the energetic state of the structure to remain unchanged during a deformation mode. Several examples in literature require either plastic deformation or external constraints to be enforced to obtain a state of pre-stress and often require the use of...journal article 2021
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Design, modeling, optimization, manufacturing and testing of variable-angle filament-wound cylindersAlmeida, José Humberto S. (author), St-Pierre, Luc (author), Wang, Z. (author), Ribeiro, Marcelo L. (author), Tita, Volnei (author), Amico, Sandro C. (author), Castro, Saullo G.P. (author)This work demonstrates the potential of manufacturing variable-angle composite cylinders via filament winding (FW), called VAFW. The proposed design strategy allows different filament angles along the axial direction by dividing the cylinder into regions of constant angle called frames. Designs using two, four, or eight frames are herein...journal article 2021