| Περίληψη: | Clutches are the machine elements which connect the engine of a system with the rest of
the system. During the engagement, the driving disc or discs transfer the power of the
engine to the driven disc through the torque. A Magnetorheological Fluid Clutch utilizes
magnetorheological fluid to achieve the engagement and the torque transfer.
Magnetorheological fluids are liquids in which ferromagnetic particles are immersed. When
the fluids are placed within a magnetic field the particles form chains in the direction of the
field, drastically changing the properties of the fluid. The biggest change has to do with the
yield stress. These fluids flow after a certain yield stress has been exceeded, thus increasing
the shear stress they exert. The flow model for these smart fluids is Bingham's model. A MRF
clutch creates an external magnetic field in order to stimulate the MRF. In this diploma
thesis, a magnetorheological clutch in various geometric configurations and input currents
has been investigated. Initially the magnetic problem was solved using ANSYS Magnetostatic
software. Then after the magnetic field was known, it was used to find the yield stress.
Finally fluid flow problem was solved using ANSYS Fluent. The shear stress of the MRF used
to calculate the torque the clutch can transfer. Then the Torque Current curves are made for
every configuration. Moreover Torque Radius curves were made in order to determine the
best configuration. Finally it was calculated the power consumption for each configuration.
In conclusion, the MRF clutches can controllably transfer large amount of torque.
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