Jixie chuandong (May 2022)
Research and Optimization on Performance of Magnetorheological Brake in Consideration of Eccentricity Compression
Abstract
Aiming at problems of low braking torque and transmission efficiency of the gap of uniform clearance magnetorheological fluid brake and according to the principle of squeeze enhancement effect of magnetorheological fluid，an eccentric magnetorheological brake is designed and the braking torque model of eccentric magnetorheological brake is established. The effects of working clearance，eccentricity and eccentric distance on braking torque are analyzed. Based on Sobol method，the global sensitivity analysis of structural parameters of the brake is carried out. Optimization is carried out taking the maximum braking torque of eccentric MRB as the objective. The results show that eccentricity has great impact on the braking torque， the braking torque of eccentric brake increases with eccentricity； it rises from 38.3 N∙m to 51.9 N∙m when the eccentricity changes from 0.1 to 0.2； the eccentric distance has a slight influence on the braking torque， the braking torque decreases with the increase of eccentric distance； the effect is also decreased when the eccentric distance is greater than 1. After optimization， the brake torque reaches at 86.3 N∙m，with an increase of 39.73% compared with the previous design. When the magnetorheological fluid reaches magnetic saturation，the braking torque is increased by 7.57% due to the eccentric structure.
