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Van Ostayen, R.A.J. (author)The "classic" solution for the support of a translating lockgate, the wheelonrail support, has relatively high construction as well as inspection and maintenance costs. An alternative support which has previously been developed for use in the Prins WillemAlexander lock is the socalled "hydrosupport", a hydrostatic thrust bearing that slides on...doctoral thesis 2002
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Van Ostayen, R.A.J. (author)The invention relates to an apparatus (1) for carrying and transporting a product, comprising a conveyor (2) having a surface (4) which during use is directed towards the product and is provided with inlet openings (7) and outlet openings (8) for a medium providing the product with traction, wherein the surface (4) is at least provided with...patent 2008
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Van Ostayen, R.A.J. (author), Munnig Schmidt, R.H. (author), Hong, P.V. (author)An apparatus for carrying and transporting a product, comprising a conveyor having a surface, which surface is during use directed towards the product and is provided with inlet openings and outlet openings for a medium for supporting and providing the product with traction, wherein the surface is divided into adjacent surface parts, and wherein...patent 2014
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Alakhramsing, S. (author), Van Ostayen, R.A.J. (author), Eling, R.P.T. (author)Accurate prediction of cavitation is an important feature in hydrodynamic bearing modeling. Especially for thermo-hydrodynamic modeling, it is crucial to use a mass-conservative cavitation algorithm. This paper introduces a new mass-conserving Reynolds cavitation algorithm, which provides fast convergence and easy implementation in finite...journal article 2015
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Kirschneck, M. (author), Polinder, H. (author), Van Ostayen, R.A.J. (author), Van Kempen, F.C.M. (author), Rixen, D.J. (author)Reducing weight of off-shore wind turbine nacelles is currently a key driver of innovation within the wind turbine industry. Weight reduction will not only lead to smaller loads and thus smaller towers of the turbine, but also reduce logistic costs during the turbine’s installation. This holds even more so for off-shore turbines, the costs...conference paper 2015
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Eling, R.P.T. (author), te Wierik, M. (author), van Ostayen, R.A.J. (author), Rixen, D.J. (author)Journal bearings are used to support rotors in a wide range of applications. In order to ensure reliable operation, accurate analyses of these rotor-bearing systems are crucial. Coupled analysis of the rotor and the journal bearing is essential in the case that the rotor is flexible. The accuracy of prediction of the model at hand depends on its...journal article 2016
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Krijnen, Martijn (author), van Ostayen, R.A.J. (author), Hassan HosseinNia, S. (author)Industry pushes towards ever faster and more accurate production of thin substrates. Contactless positioning offers advantages, especially in terms of risk of breakage and contamination. A system is considered designed for contactless positioning by floating a silicon wafer on a thin film of air. This paper focuses on the design of a control...journal article 2017
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Eling, R.P.T. (author), te Wierik, M. (author), van Ostayen, R.A.J. (author), Rixen, DJ (author)Floating ring bearings are the commonly used type of bearing for automotive turbochargers. The automotive industry continuously investigates how to reduce the bearing friction losses and how to create silent turbochargers. Many of these studies involve creating a numerical model of the rotor-bearing system and performing validation on a test...journal article 2017
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van der Weijde, J.O. (author), van Ostayen, R.A.J. (author), Vallery, H. (author)Coil springs are a common element in compliant actuators. For closed-loop control, the force of the coil spring has to be measured. Typically, deflection sensors indirectly measure this force. Implicitly, this assumes that the coil spring is a pure stiffness, without any mass. In reality, internal oscillations can occur due to impacts or other...journal article 2017
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Lampaert, S.G.E. (author), van Ostayen, R.A.J. (author), Spronck, J.W. (author)Ferrofluid bearings have recently been successfully implemented in precise<br/>positioning systems. This article gives an overview of systems built in the<br/>Department of Precision and Microsystems Engineering at Delft University<br/>of Technology in the Netherlands. Most applications are in microscope stages,<br/>where high accuracy is...journal article 2018
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Lampaert, S.G.E. (author), Fellinger, B. J. (author), Spronck, J.W. (author), van Ostayen, R.A.J. (author)Ferrofluid bearings have been demonstrated to be very interesting for precision positioning systems. The friction of these bearings is free of stick-slip which results in an increase of precision. More knowledge on the friction behaviour of these bearings is important for there application in precision positioning systems. This paper...journal article 2018
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Lampaert, S.G.E. (author), Spronck, J.W. (author), van Ostayen, R.A.J. (author)A ferrofluid pocket bearings is a type of hydrostatic bearing that uses a ferrofluid seal to encapsulate a pocket of air to carry a load. Their properties, combining a high stiffness with low (viscous) friction and absence of stick-slip, make them interesting for applications that require fast and high precision positioning. Knowledge on the...journal article 2018
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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
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Boots, Jelle (author), Spronck, J.W. (author), van Ostayen, R.A.J. (author), Lampaert, S.G.E. (author)Ferrofluid pocket bearings are interesting for fast and precise positioning systems thank to the absence of stick-slip, the low viscous friction and their cost-effective nature. However, the characteristics of the bearing change due to over(de)compression since air escapes out of the enclosed pocket. This article presents an experimentally...journal article 2019
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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
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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
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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
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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
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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
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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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