Pages
- 1
- 2
- document
-
Feng, H. (author), Gao, Zhiwei (author), van Ostayen, R.A.J. (author), Zhang, Xiaofeng (author)This paper aims to investigate the combined effects of working condition and structural parameters of groove texture on the dynamic characteristics, stability and unbalance response of a water-lubricated hydrodynamic bearing–rotor system to avoid instability and excessive vibration of the rotor. The Navier–Stokes equation, standard K-ε model...journal article 2023
- document
-
Snieder, J. (author), Dielen, Marc (author), van Ostayen, R.A.J. (author)Roll-to-plate nanoimprinting with flexible stamps is a fabrication method to pattern large-area substrates with micro- and nanotextures. The imprint consists of the preferred texture on top of a residual layer, of which the thickness and uniformity is critical for many applications. In this work, a numerical model is developed to predict the...journal article 2022
- document
-
Blad, Thijs (author), van Ostayen, R.A.J. (author), Herder, J.L. (author), Tolou, N. (author)The usually high eigenfrequencies of miniaturized oscillators can be significantly lowered by reducing the stiffness through stiffness compensation. In this work, a mechanical design for a compliant ortho-planar mechanism is proposed in which the stiffness is compensated to such a degree that it can be identified as statically balanced. The...journal article 2022
- document
-
Amoozandeh, A. (author), Radaelli, G. (author), van de Sande, W.W.P.J. (author), van Ostayen, R.A.J. (author), Herder, J.L. (author)Compliant mechanisms (CM) with adaptive stiffness have been widely used in robotics and machine design applications. This paper proposes adapting the endpoint stiffness of a spatially curved compliant beam using a movable torsional stiffener and a new graphical characterization method for the resulting anisotropic stiffness of the endpoint...journal article 2022
- document
-
Hooijschuur, R.H.T. (author), Saikumar, N. (author), Hassan HosseinNia, S. (author), van Ostayen, R.A.J. (author)This paper presents the development of a contactless sensing system and the dynamic evaluation of an air-bearing based precision wafer positioning system. The contactless positioning stage is a response to the trend seen in the high-tech industry, where the substrates are becoming thinner and larger to reduce the cost and increase the yield....journal article 2022
- document
-
van Puffelen, Kylian (author), Blad, Thijs (author), van Ostayen, R.A.J. (author)Vibrations are a promising source for powering wireless sensors, for example in low-frequency environments like human motion. These environments suffer from unpredictable vibration spectra and their low-frequency and large amplitude characteristics offer great possibilities for mechanisms with double well potential energy characteristics. The...conference paper 2022
- document
-
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
- document
-
Blad, Thijs (author), van Ostayen, R.A.J. (author), Tolou, N. (author)Compliant ortho-planar mechanisms can be fabricated from a single sheet of material and they can move out of the plane in which they are fabricated. In this work, a design of such a mechanism is proposed in which stiffness compensation is applied. With a finite-element model, the force-deflection relation of the buckled mechanism was modelled...journal article 2021
- document
-
van Parijs, Vincent (author), Nijssen, J.P.A. (author), van Ostayen, R.A.J. (author)Hydrostatic bearings are superior in terms of their friction and load carrying characteristics when compared to contact based bearings, but non-usable in applications with non-constant curvature counter surfaces. A possible solution to this limitation is the introduction of deformable hydrostatic bearings components that cope with these...journal article 2021
- document
-
Hooijschuur, R.H.T. (author), Saikumar, N. (author), Hossein Nia Kani, S.H. (author), van Ostayen, R.A.J. (author)This paper presents the development of a contactless sensing system and the dynamic evaluation of an air-bearing-based precision wafer positioning system. The contactless positioning stage is a response to the trend seen in the high-tech industry, where the substrates are becoming thinner and larger to reduce the cost and increase the yield....journal article 2021
- document
-
Nijssen, J.P.A. (author), Faludi, Jeremy (author), van Ostayen, R.A.J. (author)Water lubricated bearings have been named in literature as a sustainable alternative to their oil-based counterparts. In order to clarify when water lubricated bearings are or are not a sustainable alternative, and inform design decisions, an analytical design tool is introduced based on anticipatory Life Cycle Assessment (LCA). This model is...journal article 2021
- document
-
van den Toorn, S.W.M. (author), Spronck, J.W. (author), van Ostayen, R.A.J. (author), Lampaert, S.G.E. (author)The objective of this research is to demonstrate the capability of a long stroke linear ferrofluid (FF) stage. This stage is a passive alternative to existing linear aerostatic stages and can be used in low loaded CNC devices, pick and place machines, microscopy or scanner applications. To compete with aerostatic stages the bearing must be...journal article 2021
- document
-
van den Toorn, S.W.M. (author), Spronck, J.W. (author), van Ostayen, R.A.J. (author), Lampaert, S.G.E. (author)The novel contribution of this research is insight into the influence of different parameters in the magnet configurations on the load and stiffness of a ferrofluid pressure bearing. It is shown that magnets with a small cross-section magnetized alternatively up and downwards combine a high load capacity and moderate stiffness while being low...journal article 2021
- document
-
Blad, Thijs (author), van Ostayen, R.A.J. (author), Tolou, N. (author)In this paper a method is demonstrated for tuning the stiffness of building blocks for statically balanced compliant ortho-planar mechanisms. Three post-buckled mechanisms are proposed where the flexural rigidity can be manipulated over a part of their length in order to tune the ratio between the first two critical loads. A sensitivity...journal article 2021
- document
-
Allebrandi, Sander (author), Lampaert, S.G.E. (author), van Ostayen, R.A.J. (author)Magnetic fluids have been around since the 1940s. They come in different forms: magnetorheological fluids (MR fluids) and ferrofluids. MR fluids characterise themselves by having a large change in viscosity under the influence of a magnetic field. Ferrofluids have a significantly smaller change in viscosity, however ferrofluids are colloidal...journal article 2020
- document
-
Lampaert, S.G.E. (author), van Ostayen, R.A.J. (author)The rheological behavior of many lubricants used in hydrodynamic bearings can reasonably be modeled using the Bingham plastic material model. This behavior is characterized by a strong discontinuity, from a pure solid state to a viscous fluid state depending on the local shear stress. In literature three methods have been presented to model a...journal article 2020
- document
-
Lampaert, S.G.E. (author), Quinci, Federico (author), van Ostayen, R.A.J. (author)This paper discusses a new type of hybrid journal bearing in which a magnetorheological fluid is used in combination with local magnetic fields, such that the hydrodynamic and hydrostatic working regimes are not compromised. This demonstrates the potential of using the concept of rheological texture in bearings. The performance of this new...journal article 2020
- document
-
Codrignani, A. (author), Savio, D. (author), Pastewka, L. (author), Frohnapfel, B. (author), van Ostayen, R.A.J. (author)In this work we assess the applicability of the adjoint optimization technique for determining optimal surface topographies of two surfaces in relative motion in presence of a thin lubricant films that can cavitate. Among the existing numerical tools for topology optimization in engineering problems, the adjoint method represents a promising...journal article 2020
- document
-
van der Wal, Karoen (author), van Ostayen, R.A.J. (author), Lampaert, S.G.E. (author)Ferrofluid rotary seals are mechanical contact-free magnetic liquid seals that are characterised by their simple structure, low friction and ability to hermetically seal. Although ferrofluid rotary seals for sealing vacuum and gases are part of a well established industry, the sealing of liquids has not been implemented yet. Literature learns...journal article 2020
- document
-
Lampaert, S.G.E. (author), van Ostayen, R.A.J. (author)Magnetorheological fluids can be used as a smart lubricant as a result of the fact that its properties can be changed with the use of a magnetic field. Local flow resistance and local pressure can be generated by applying a local magnetic field. This work presents a hydrostatic bearing in which the pressure profile of a conventional...journal article 2019
Pages
- 1
- 2