Design and Development of Rheometer for Magnetorheological Fluid
Date Issued
2015
Date
2015
Author(s)
Tsai, Jonathan
Abstract
Magnetorheological fluid is a unique fluid with special interaction to magnetic field. The viscosity of the fluid varies with magnetic flux density. Several applications were developed based on this phenomenon with magnetorheological damper being the most common one. During the operation, magnetorheological fluid will experience squeezing and friction. As the result, the temperature will rise up to 40 to 60 degrees Celsius. The rise in temperature affects magnetic properties, micro structure of magnetorheological fluid as well as viscosity, which in turn affects the overall performance of the system. The interaction between magnetorheological fluid and magnetic field are widely researched in relevant field. However, only a few researches were about the influence of temperature on magnetorheological fluid. In this thesis, a rotational rheometer is designed specifically for magnetorheological fluid measurement using optical pickup unit as torque sensor in order to measure the trend of how the fluid viscosity varies under different temperature. With the use of the measure data, the design application can be optimized based on system temperature. The data can helpful for more precise and dedicate usage. The design of the measuring device is based on strain-controlled rotational rheometer. When the device applies torque to the measured fluid, the fluid viscosity will apply torque to flexible construction in the measuring device causing distortion and displacement in the construction. The optical pickup unit is used to measure the displacement and calculate fluid viscosity. The measuring device utilizes magnetic coil and heater. The surrounding of the device is covered with metal shell with high permeability to prevent magnetic field from leaking and maintain its strength throughout the measuring area. The heater can be used to alter the temperature measured fluid. The measuring device is capable of measuring the fluid under different magnetic flux density and temperature combination. Magnetorheological fluid MRF-122-2ED is chosen to be the measured fluid. Several experiment was conducted to measure its performance under different magnetic flux density and temperature combination.
Subjects
magnetorheological fluid
rotational rheometer
viscosity
temperature
magnetic field
Type
thesis
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