A new concept in bearing technology: Magnetorheological texturing

A new concept in bearing technology: Magnetorheological texturing

de Graaf, Marc (TU Delft Mechanical, Maritime and Materials Engineering; TU Delft Precision and Microsystems Engineering)

Lampaert, Stefan (mentor)
van Ostayen, Ron (graduation committee)
van de Water, Willem (graduation committee)
Quinci, Federico (graduation committee)

Delft University of Technology

Mechanical Engineering

2019-01-29

Fluid bearings have superior wear behavior but still the lifetime of this concept is in not infinite. This wear gets especially troublesome when surface textures are used that can get worn away completely. In this thesis two mechanisms utilizing surface textures for pressure buildup in a lubricating film using magnetorheological (MR) fluids are studied. The first uses local viscosity variation resulting in so-called virtual surface textures. These surface textures can be created using an MR fluid because their flow behavior can be controlled in presence of a magnetic field. The second is also a new mechanism introduced in this thesis, the use of local sedimentation of magnetic particles in locations of higher magnetic field strengths resulting in physical surface textures. By modeling it is demonstrated that it is possible to create surface textures using an MR fluid as lubricant and that these surface textures pressurize the fluid in order to obtain a load carrying capacity. A proof of concept for a hydrodynamic thrust bearing lubricated with an MR fluid in order to create surface textures is modeled and produced. For the models virtual and physical surface textures are considered which correspond to two extremes respectively, the case that the particles stay completely in suspension and for the case that the particles show complete sedimentation. The experimental results correspond to the situation where the magnetic particles are completely sedimented. These sedimented particles form self-healing physical surface textures over which the carrier fluid flows.

Magnetorheological fluids
Hydrodynamic thrust bearing
FEM modelling
magnetics
surface texturing
load capacity
Self-healing

http://resolver.tudelft.nl/uuid:5bd66069-cf39-49c7-a19d-4d677ae021ab

2024-01-29

Student theses

master thesis

© 2019 Marc de Graaf