Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 20 of 60 for “"Magnetorheological"”.
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Modeling of magnetorheological elastomers
Magnetorheological elastomers (MREs) are composite materials whose mechanical properties can rapidly and reversibly change with the application of a magnetic field. MREs are composed of a non-magnetic polymer matrix embedded with magnetic particles. These materials can also demonstrate …
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Heating effects on magnetorheological dampers
… most recent promising systems proposed is the Magnetorheological damper (MR damper). Because of their ability to be controlled and to adapt their mechanical properties by varying a magnetic field, their high damping force (200kN), their low energy input required and their simple use and …
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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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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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Dynamic analysis of magnetorheological elastomer configured sandwich structures
… the investigation of the dynamic behaviour of magnetorheological elastomers (MREs) and smart sandwich structures. An extensive review, covering existing smart materials and their applications, has highlighted that smart materials and structures can be applied to large scale structures. …
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Magnetic and Mechanical Properties of Ultrasoft Magnetorheological Elastomers
<p>Magnetorheological elastomers (MREs), composite materials consisting of magnetic particles embedded in a non-magnetic elastomeric matrix, can reversibly modulate their mechanical and magnetic properties through tuning the applied magnetic field <em>H</em>. Recently, ultrasoft MREs have received …
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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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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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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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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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Online learning algorithm for structural control using magnetorheological actuators
Magnetorheological actuators are promising devices for mitigating vibrations because they only require a fraction of energy for a similar performance to active control. Conversely, these semi-active devices have limited maximum forces and are hard to model due to the rheological properties of their …
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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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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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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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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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Experimental Evaluation of Semiactive Magnetorheological Primary Suspensions for Heavy Truck Applications
… study evaluates the performance of a semiactive magnetorheological primary suspension on a heavy truck application. A set of magnetorheological dampers is designed, fabricated, and characterized. The set of magnetorheological test dampers are implemented on a Volvo VN heavy truck. An embedded …
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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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Characterizing the Behavior of Magnetorheological Fluids at High Velocities and High Shear Rates
Magnetorheological (MR) fluids offer solutions to many engineering challenges. The success of MR fluid is apparent in many disciplines, ranging from the automotive and civil engineering communities to the biomedical engineering community. This well documented success of MR fluids continues to …
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