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Showing 1 to 15 of 15 for “"magnetorheological fluid"”.
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Development of Novel Compressible Magnetorheological Fluid (CMRF)
A novel of compressible magnetorheological fluid (CMRF) has been synthesized from modified silicone oil, composite polyurethane-microspheres additives, and surface coated iron particles. The CMRF has been designed to replace the spring in a damper system. Thus, the fluid has to provide an elastic …
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A controllably adhesive climbing robot using magnetorheological fluid
In this thesis, the novel adhesive effects of magnetorheological fluid for use in climbing robotics were experimentally measured and compared to existing cohesive failure fluid models of yield stress adhesion. These models were found to correlate with experimental results at yield stresses below …
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Analytical and Numerical Approaches on the Stiffness of Magnetorheological Fluid Filled Spring
… thesis studies a mechanical spring filled with magnetorheological (MR) fluid to achieve controllable stiffness. The hollow spring filled with MR fluid is subjected to a controlled magnetic field in order to change the viscosity of the MR fluid and thereby to change the overall stiffness of the …
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A Novel Magnetorheological Fluid Damper for a Small Spacecraft with Flexible Appendages
… takes advantage of a smart material known as a magnetorheological (MR) fluid that was initially created in the 1940s, but has been subject to renewed interest over the past 30 years. A numerical model of the damper system is described and test articles with representative properties are …
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Development, characterization and applications of magnetorheological fluid based "smart" materials on the macro-to-micro scale
Magnetorheological fluids belong to the class of field-responsive fluids that undergo large, reversible and fast changes in their rheological properties when acted upon by an external magnetic field. 'Smart' or controllable composite materials have been obtained by doping polymers, foams, fabrics …
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A Fail-safe, Bi-Linear Liquid Spring, Controllable Magnetorheological Fluid Damper for a Three-dimensional Earthquake Isolation System
… fail-safe, bi-linear liquid spring, controllable magnetorheological (MR) damper is designed, built and tested. The device combines the controllable MR damping in addition to the fail-safe viscous damping and liquid spring features on a single unit serving as the vertical component of the building …
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In-Depth Study of Different Magnetorheological Fluid Properties Under Different Operating Parameters, and in Presence of Organic Additives
… on the application of a magnetic field makes magnetorheological fluids (MRFs) a valuable material for various damping systems. As MRFs form chains, MRFs transit from a liquid state to a solid-like state exhibiting an increase in viscosity. Since MRF discovery, commercialization, and …
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A study of a piezoelectric energy harvesting system using magnetorheological fluids
… energy harvesting system using a thin layer of magnetorheological fluid as a soft impact mechanism to enhance the frequency of the energy generator. Currently, the major bottleneck of vibration energy harvesting is the dynamic nature of vibrations in the environment which necessitates that …
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Magnetic fluid flow phenomena in DC and rotating magnetic fields
An investigation of magnetic fluid experiments and analysis is presented in three parts: a study of magnetic field induced torques in magnetorheological fluids, a characterization and quantitative measurement of properties relating to the transition of a ferrofluid drop from a continuous phase into …
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Field-responsive ('Smart') fluids for advanced automotive applications
… foam impregnated with a field-responsive fluid such as a magnetorheological fluid or a shear-thickening fluid. Stable and inexpensive magnetorheological (MR) fluids based on carbonyl iron powder have been synthesized in the laboratory. The rheological properties, including the field …
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Combined Shock and Vibration Isolation Through the Self-Powered, Semi-Active Control of a Magnetorheological Damper in Parallel with an Air Spring
… of an air spring in parallel with a controlled magnetorheological fluid damper. The benefits of combining shock and vibration isolation into a single package is discussed. Modeling and control issues are investigated and test and simulation results are discussed. It is shown that this hybrid …
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Comparison of Linear, Nonlinear, Hysteretic, and Probabilistic MR Damper Models
Magnetorheolgical (MR) fluid dampers have the capability of changing their effective damping force depending on the current input to the damper. A number of factors in the construction of the damper, as well as the properties of the fluid and the electromagnet, create a dynamic response of the …
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Fundamental Dynamics and Performance Assessment of Three-Dimensional Seismic Isolation
… with bilinear liquid spring (BLS) - controllable magnetorheological fluid dampers (CMRD) to resist vertical shaking. The simplified rigid block model is extended to predict the response of the building isolated with BLS-CMRD devices under earthquake loading. BLS-CMRDs are simulated through a …
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Analytical modelling of annular flow magnetorheological valves for advanced fluid control
Magnetorheological valves have the potential to disrupt the fluid control industry with their numerous advantages over mechanical valves. The current design and development process of these valves largely leverages computer simulation and experimental analysis. This dependency on physical and …
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Design and Characterization of Tunable Magneto-Rheological Fluid-Elastic Mounts
… mounts sets out to capture the uniqueness of magnetorheological (MR) fluid's variable viscosity rate, and to physically alter the damping and stiffness when used inside an elastomeric mount. Apparent variable viscosity or rheology of the MR fluid has dependency on the application of a magnetic …