Analysis of the Flow and Transmission Performance of Magnetorheological Brakes Based on Shear-Squeeze Mode

EasyChair Preprint 7784

Abstract

Aiming at the complex structure of the existing squeezed magnetorheological brakes, a disc-type magnetorheological brake strengthened by self-squeezing using wedge-shaped gaps is proposed in this article. Four rectangular slots were evenly distributed on the rotor surface of this actuator, and the pressure generated by the gap variation squeezes the magnetorheological fluid, which makes the actuator more compact while improving its working performance. The magnetic field was analyzed based on the finite element method, the magnetic and mechanical properties of the magnetorheological fluid under different currents were obtained. Then, on the basis of computational fluid dynamics, the flow field analysis of the magnetorheological fluid was carried out, and the cloud diagram of squeezing stress distribution along the circumference was obtained. At last, the flow equation of magnetorheological fluid is derived based on the Navier-Stokes equation and the squeeze strengthening model, and the relationship between the torque, current, and squeeze stress was established. The results show that the wedge gap causes the periodic change of fluid squeeze stress, and the shear yield stress of magnetorheological fluid increases significantly after squeeze strengthening. When the input current is 2.0 A, the shear yield stress is 67.7 kPa and the torque is 24.8 N·m, which is about 46.2 % higher compared with the un-squeezed state.

Keyphrases: Magnetorheological fluid Brake, flow, squeeze-strengthening effect, torque, wedge gap squeeze

@booklet{EasyChair:7784,
  author    = {Hang Gong and Ruizhi Shu and Guanghui Hu and Wenjian Chen and Yang Xiong and Jin Huang},
  title     = {Analysis of the Flow and Transmission Performance of Magnetorheological Brakes Based on Shear-Squeeze Mode},
  howpublished = {EasyChair Preprint 7784},
  year      = {EasyChair, 2022}}