磁流變液(Magnetorheological Fluid)是一種對磁場有特殊反應的流體,隨著磁場強度改變,流體黏滯度會有所變化,衍伸出許多特殊應用,當中以阻尼器為主要用途。在磁流變液使用上會經歷擠壓、磨擦而產生熱量,長時間運作下可使溫度上升至四十到六十度左右並影響磁流變液的導磁特性與結構,也會改變液體黏滯度,影響整體表現。相關學術領域對於磁流變液與磁場間的互動有不少的研究,然而對於溫度所造成的影響並沒有太多相關研究。 本論文設計適用於磁流變液之流變儀採用光學像散式讀取頭做為扭力量測元件。為了能夠量測磁流變液在不同溫度下的性能表現以及變化趨勢,當磁流變液運用在各種系統中時,只要配合已知的溫度變化數據就能因應系統溫度做最佳化調整,有利於更精準的操作及運用。 儀器設計以應變控制型旋轉式流變儀為基礎加以修改,當量具旋轉時待測樣品的黏滯力會使撓性結構變形,透過像散式讀取頭量測位移量計算黏滯度大小。儀器整合了電磁線圈與加熱器,同時儀器周圍以導磁外殼罩住,能避免磁力外露及維持黏滯力作用區的磁場強度,加熱器能將待測樣品溫度調整至欲量測溫度,能夠量測研究磁流變液在不同磁力與溫度下的性能表現,以完成磁流變液的溫度-磁通量密度-黏滯度三圍圖表。 實驗量測對象選用為磁流變液MRF-122-2ED,並成功量測在不同溫度與磁場下的黏滯係數,了解溫度對磁流變液性能表現的影響。
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.
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