Searched for: author%3A%22Van+Ostayen%2C+R.A.J.%22
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Amoroso, Pedro (author), van Ostayen, R.A.J. (author), de Rooij, Matthijn B. (author)
This work introduces two innovative rolling pair concepts to minimize slippage and reduce mass in cam-roller systems of large-scale hydraulic drivetrains: The variable contact length and the Shifting Contact Geometry concepts. Both aim to improve traction in the low contact force phase in cyclically loaded rolling contacts. The shifting...
journal article 2024
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Amoroso, Pedro (author), van Ostayen, R.A.J. (author), de Rooij, Matthijn B. (author)
The rolling-sliding dynamics of large-scale cam-roller contacts are strongly influenced by the inertia of the roller, particularly when slippage occurs. Slippage can potentially impact the reliability of these rolling interfaces. This study introduces an approach to replicate the rolling-sliding dynamics of cam-roller contacts in a large-scale...
journal article 2024
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Sonneveld, D.D. (author), Nijssen, J.P.A. (author), van Ostayen, R.A.J. (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 behavior. However, the loading capability is often limited and the support stiffness generally decreases during rotation. A new design principle called...
journal article 2023
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Snieder, J. (author), Dielen, Marc (author), van Ostayen, R.A.J. (author)
This work presents the development of a numerical model for the elastohydrodynamic lubrication of roll-to-plate nanoimprinting with flexible stamps. Roll-to-plate nanoimprinting is a manufacturing method to replicate micro- and nanotextures on large-area substrates with ultraviolet-curable resins. The roller is equipped with a relatively soft...
journal article 2023
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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
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Atalla, M.A.A. (author), van Ostayen, R.A.J. (author), Sakes, A. (author), Wiertlewski, M. (author)
Transverse vibrations can induce the non-linear compression of a thin film of air to levitate objects, via the squeeze-film effect. This phenomenon is well captured by the Reynolds' lubrication theory; however, the same theory fails to describe this levitation when the fluid is incompressible. In this case, the computation predicts no steady...
journal article 2023
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Amoroso, Pedro (author), van Ostayen, R.A.J. (author), Perassi, F. (author)
Generally speaking, excessive side thrust and roller slippage are two different aspects affecting cam-roller mechanisms. In novel large-scale hydraulic drivetrains for offshore wind turbines, the highly dynamic nature of these mechanisms combined with the interplay of cyclic loads, frictional torques and inertia promote slippage at the cam...
journal article 2023
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van der Meer, G.H.G. (author), Quinci, F. (author), Litwin, W. (author), Wodtke, M. (author), van Ostayen, R.A.J. (author)
A journal bearing test bench is used to find the transition speed between the hydrodynamic and mixed lubrication regimes for a modified magnetorheological (MR) fluid. It is shown that the transition speed of the bearing can be reduced by applying a local magnetic field near minimum film when it is lubricated with the MR fluid, and that this...
journal article 2023
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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
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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
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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
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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
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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
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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
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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 2021
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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
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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
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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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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
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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
Searched for: author%3A%22Van+Ostayen%2C+R.A.J.%22
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