Fundamental Study on Operating Temperature and Braking Torque of Magneto-Rheological Fluid Brake

Abstract

　In this study, the characteristics of a cylindrical magneto-rheological fluid brake made by using a magneto-rheological fluid are considered in which shear stress is generated by forming a chain structure by applying magnetic field. This brake is targeted for adaptation to aircraft. When the aircraft uses the brakes, the temperature inside the brakes rises to over 300 degree, so the values are evaluated when the operating temperature is changed. Since anti-skid braking systems are usually applied to aircraft, the anti-skid braking system is applied to the experimental device used this time, and the shear stress and time constant are measured by changing the operating temperature. The value of the time constant increases as the mean grain size increases. The values of shear stress have increased with increasing grain size in the order of 25, 45 and 8 µm. The values of shear stress and magnetic flux density do not change with temperature. The characteristics of the decrease in rotational speed over time will be investigated in the future.