Topic
Magnetorheological fluid
About: Magnetorheological fluid is a research topic. Over the lifetime, 8538 publications have been published within this topic receiving 131502 citations. The topic is also known as: MRF & MR fluid.
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TL;DR: In this paper, the vibration responses of a partially treated composite magnetorheological (MR) fluid sandwich plate have been investigated and the governing differential equations of motion have been analyzed.
Abstract: In this study, the vibration responses of a partially treated laminated composite magnetorheological (MR) fluid sandwich plate have been investigated. The governing differential equations of motion...
44 citations
TL;DR: In this article, the authors investigated the viscoelastic behavior of supramolecular magnetorheological polymer gels with small and large-amplitude oscillatory shear using the amplitude and frequency sweep mode.
Abstract: Novel magnetorheological fluids—supramolecular magnetorheological polymer gels (SMRPGs)— were investigated. Supramolecular polymer deposited on the surface of iron particles was suspended in the carrier fluids. The supramolecular network was obtained by metal coordination between terpyridine monomers and zinc ion. These SMRPGs had such advantages as controllable off-state viscosity, a reduced iron particle settling rate, and stability. The viscoelastic behavior of SMRPGs with small- and large-amplitude oscillatory shear was investigated using the amplitude and frequency sweep mode. The effects of strain amplitude, frequency, and magnetic field strength on the viscoelastic moduli were measured. The linear viscoelastic (LVE) strain range was obtained by the oscillation and static stress strain methods. The maximum LVE value was equal to the preyield strain point, 0.3%. Microstructural variation of SMRPG is proposed as an explanation of the rheological changes in the oscillation tests. The results of this research indicate that off–state viscosity and particle settling can be controlled by adjusting the concentration of supramolecular polymer gel. Dynamic yield stress significantly increased with an external magnetic field up to ∼23,500 Pa under a magnetic flux density of 500 mT. © 2006 Wiley Periodicals, Inc. J Appl Polym Sci 100: 2464–2479, 2006
44 citations
TL;DR: Results indicate that MR-PDMS microspheres can be used as high-Q-factor tunable optical cavities with potential applications in sensing, and the applied field induces mechanical deformation, causing shifts in the WGM.
Abstract: We investigate the possibility of using magnetorheological polydimethylsiloxane (MR-PDMS) spheres as micro-optical resonators. In particular, the effect of a magnetic field on the whispering gallery modes (WGM) of these resonators is studied. The applied field induces mechanical deformation, causing shifts in the WGM. The microspheres are made of PDMS with embedded magnetically polarizable particles. An analysis is carried out to estimate the WGM shifts induced by an external magnetic field. An experiment is also carried out to demonstrate the magnetic field-induced WGM shifts in an MR-PDMS microsphere. The results indicate that MR-PDMS microspheres can be used as high-Q-factor tunable optical cavities with potential applications in sensing.
44 citations
TL;DR: In this article, the morphology, microstructure and magnetic properties of the bare Fe3O4 and 3-aminopropyltriethoxysilane (APTES)-coated Fe 3O4 nanoparticles were investigated in detail by TEM, XRD, FTIR and SQUID.
Abstract: In this study, monodisperse Fe3O4 nanoparticles were synthesized successfully using a sonochemical method in the presence of 3-aminopropyltriethoxysilane (APTES). The morphology, microstructure and magnetic properties of the bare Fe3O4 and APTES-coated Fe3O4 were investigated in detail by TEM, XRD, FTIR and SQUID. It was found that APTES-coated Fe3O4 showed relatively good dispersion with a narrow size distribution of 8.4 ± 2.1 nm diameter. The functionalization of Fe3O4 was proved to be covalent linking between Fe3O4 and APTES. The field-dependent magnetization curve indicated superparamagnetic behavior of Fe3O4-APTES with a saturation magnetization (M s) of 70.5 emu g−1 at room temperature. A magnetorheological (MR) fluid was prepared using the obtained Fe3O4-APTES nanoparticles with 25 wt% particles, and its MR properties were tested using a Physica MCR301 rheometer fitted with an MRmodule. The results showed that the as-prepared APTES-coated Fe3O4 nanoparticle-based MR fluid exhibited typical MR effects, with increasing viscosity, shear stress and yield stress depending on the applied magnetic field strength.
44 citations
Proceedings Article•
13 Jun 2007TL;DR: In this paper, a recurrent neural network is trained to reproduce the behavior of the MR damper and it will be shown that the results are better that those obtained by approximate physical models.
Abstract: This paper presents the results of modeling a magnetorheological (MR) damper by means of a neural network. TheMR damper is a device extensively used to mitigate hazardous vibrations in systems such as vehicles, bridges and buildings. The advantages of these dampers over other devices of their class rely on the cost, size, simplicity and performance. However, these devices are highly nonlinear; their dynamics is characterized by friction and hysteresis, phenomena that has been difficult to model following physical laws. In this paper, a recurrent neural network is trained to reproduce the behavior of the damper and it will be shown that the results are better that those obtained by approximate physical models.
44 citations