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Showing 1 to 20 of 25 for “"Magnetorheological (MR)"”.
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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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Structure and dynamics of mangetorheological fluids confined in microfluidic devices
Microfluidic devices and magnetorheological (MR) fluids have been two areas of intense research for several years. Traditionally, these two fields have remained separated from one another by scale. MR fluids are best known for their use in large-scale applications such as seismic dampers for the …
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Controle inteligente de vibrações utilizando amortecedor magneto reológico
Magnetorheological (MR) dampers are widely used in industrial applications such as vibration control of machine tools and structures subject to seismic earthquakes; active or semi-active suspensions in the automotive industry, as well as clutch and brake systems; and in the biomechanics area with …
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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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Design and Development of a Squeeze-Mode Rheometer for Evaluating Magneto-Rheological Fluids
… study aims to better understand the behavior of magnetorheological (MR) fluids operated in the non-conventional squeeze mode through the use of a custom designed rheometer. Squeeze mode is the least understood of the three operational modes of MR fluid and thus its potential has yet to be …
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Design Optimization of MagneShock Magnetorheological Shock Absorbers and Development of Fuzzy Logic Control Algorithms for Semi-Active Vehicle Suspensions
… suspension equipped with commercially available magnetorheological (MR) shock absorbers, Carrera MagneShocks™. MagneShocks™ utilize controllable electromagnets to change the MR fluid viscosity and vary the damping characteristics of the shock. The application of FLC to these components, based on …
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Characterisation and Modelling for Elastomeric and Gel-Like Magnetorheological Materials
Magnetorheological (MR) material is an aspiring branch of smart material. It can change its mechanical properties rapidly and reversibly subjected to an externally applied magnetic field, so-called MR effect. Due to the sensitivity to magnetic field and the versatility in physical states, i.e., …
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Design and optimization of micropumps using electrorheological and magnetorheological fluids
… we propose to employ electrorheological (ER) and magnetorheological (MR) fluids as the hydraulic fluids. This thesis presents two methods: one is a dynamic sealing method to be applied on current micro-scale gear pumps using MR fluids, and the other is a novel design method of micropumps using ER …
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Energy Redistribution with Controllable Binary State Latch Element
… viewed as variable semi-active dampers such as magnetorheological (MR) and piezoelectric friction dampers. The distinct difference between other semi-active dampers and our latch device is that other semi-active dampers can provide continuous resistance according to the amount of input current, …
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Behavior of Magneto-Rheological Fluids Subject to Impact and Shock Loading
Investigations on the design of controllable magnetorheological (MR) fluid devices have focused heavily on low velocity and low frequency applications. The extensive work in this area has led to a good understanding of MR fluid properties at low velocities and frequencies. However, the issues …
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Theoretical and experimental study on cable vibration reduction with a TMD-MR damper
… problem, in addition to using the existing Magnetorheological (MR) damper, the current study proposes a new type of damper, called the Tuned Mass Damper-Magnetorheological (TMD-MR) damper. Theoretical and experimental investigations for the damper performance on the cable vibration reduction …
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Magnetorheological fluids for extreme environments : stronger, lighter, hotter
The controllable properties of magnetorheological (MR) fluids offer reliable and efficient actuation means to a number of far-ranging engineering applications. In this thesis we are motivated by the applications of MR fluids in oil & gas exploration and production. These applications also bring …
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Application of Magnetorheological Dampers for Vehicle Seat Suspensions
… subjective feel of seat suspensions that employ magnetorheological (MR) dampers and skyhook control. An Isringhausen seat suspension that had been modified to replace the stock passive damper with a controllable MR damper was used to evaluate the problems and potential solutions. A seat …
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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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Development of Magnetorheological Elastomer System for Adaptive Vibration Isolation
… under traffic and wind loadings, featuring magnetorheological elastomers (MREs). MREs were utilized to generate adaptability (variable stiffness) to the AB system. The investigations of this project were fundamental and developmental studies ranging from material synthesis, material …
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Modeling and control of smart structures embedded with magnetorheological devices
… a promising solution to the problem, such as the magnetorheological (MR) damper (MRD), pin joint (MRP), and elastomer base isolator (MRE). This study first aims at exploring the solutions to the present problem in system modeling and controller design of MR based systems to effectively damp out …
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Improvement of semi-active control suspensions based on gain-scheduling control
… main constraint for semi-active devices such as Magnetorheological (MR) dampers is that they are only capable of providing active control forces by dissipating energy, in their active mode, and they switch to work as simple passive dampers, the passive mode, when energy injection is demanded by …
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The behaviour of magnetorheological fluids in squeeze mode
Magnetorheological (MR) fluids possess rheological properties, which can be changed in a controlled way. These rheological changes are reversible and dependent on the strength of an excitation magnetic field. MR fluids have potentially beneficial applications when placed in various applied loading …
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Field-responsive ('Smart') fluids for advanced automotive applications
… 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 dependent …
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