Abstract
Magnetorheological (MR) brakes have attracted many attentions for controlling mechanical systems such as robots, e-bicycles, and haptic devices. A large number of researchers have delved into enhancing MR brake effectiveness. Herein, a new MR brake is proposed in which the braking torque is improved and the configuration is simplified. Numerical simulations were based on finite element method (FEM) was employed to achieve the brake model. In order to verify the obtained results, they were compared with the available ones in the literature and they have a good agreement with each other. Then, the proper brake model was optimized using Nelder–Mead optimization algorithm. Results demonstrated 215.75 N m braking torque in the present prototype which is almost 73% higher than the previous model in the literature. In addition, the brake could induce about 125.06 N m torque on the brake disk with nearly half of the coil current used in the previous work. Besides, increase in the number of the disks was not necessarily improved braking efficiency and the size of the MR fluid gaps also influenced the brake operation. In addition, the proposed model in this paper has ease manufacturing procedure which would reduce the fabrication costs.
Highlights
Breakthroughs in technology have made it possible for researchers to synthesize materials with controllable properties
A large number of optimization algorithms such as genetic algorithm [21,31], SEUMRE [26], and multidisciplinary design optimization (MDO) [28] were employed in order to reach the best configuration of MR brakes
finite element method (FEM) was employed in order to propose a new MR brake
Summary
Breakthroughs in technology have made it possible for researchers to synthesize materials with controllable properties. Lee et al [17] employed rotary MR brake for controlling robotic ankle motion and optimized the prototype using genetic algorithm They considered temperature effects on the performance of the brake. Lee et al [17] utilized MR brake system to control tension of a rope in winch spooler system They designed and simulated the system by FEM, they fabricated and tested the most optimized configuration. Park et al [20] studied the effects of magnetostatics, fluid flow, and heat transfer on the braking efficiency of an MR brake with a single disk They optimized the model and the most efficient configuration was suggested. The main objective of their study was demonstrating the application of this algorithm for highly nonlinear and sophisticated engineering design optimization problems They compared the results of this algorithm with genetic (GA) and simulated annealing (SA) algorithms.
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