About a review on design and analysis of drum brake using magnetorheological fluid Essay

The optimum torque of 25.1 Nm was achieved by keeping 0.5mm fluid layer and using AISI 1018 steel for rotor and stator material. • Satyajit Patil & Suresh. M. Sawant (2018) [5] introduced a design for MR fluid brake for replacing conventional hydraulic brake of road vehicle for two wheeler application and was investigated. The MR brake assembly that was considered is as shown in fig 18(a). The MR brake was having single disc with MRF 132 –DG fluid and 1mm MR gap was considered. AWG 21 copper wire was used with diameter of 0.77mm and current density 2.653 A/mm2 for electromagnet. The magneto motive force was determined of 238.73 amp-turns and so at 1.5A, 160 turns were estimated. The braking torque performances were investigated for angular speed, MR fluid gap, and current from previous literatures. The MATLAB simulink model was used to evaluate braking performance of MR brake. The simulink model was helpful for reduction in cost and saving time for experimentation. At current 1.5A and at speed 20.63 rad/sec, 15.43 Nm braking torque was obtained. The fig 18(b) shows the variation in braking torque at different current and various angular speeds. According to the IS 14664 : 1999 the maximum force of 260N was taken and current .The stopping time and stopping distance was calculated by simulink model and were compared with the results of analytical equations for various current inputs. It was seen that MR brake with two disks will not be able to meet the requirement so it will need more than 5 disks which will increase the weight and size and that will not be practically feasible as shown in fig 24.This work presents the study of the different existing MR brake designs. The brakes were designed in order to replace the conventional hydraulic brake of road vehicle. Performances of Disk brake and drum brake both were studied by the literature. The total braking torque was calculated and was compared with the various angular speeds and current inputs. It is seen that the high transmitted torque increases with increase in magnetic field strength and rotary speed. The electromagnet was designed with the help of FEA for high efficiency magnetic field strength. The MATLAB/Simulink model was developed for the analysis and calculations of the braking performance by using various parameters of MR fluid brake. 7. Future scope: The unique design of electromagnet can be given by using FEA for best dimension and high strength. The new rotor can be designed in such a way that surface area increases so more effective braking torque can be developed. The response time of the brake can be increased by various analytical calculations at various current and angular speeds. The comparison of both MR fluid disk brake and MR fluid drum brake can be done with the existing conventional hydraulic brakes of road vehicle. The MR fluid brake cost can be optimized and can be implemented in current automobile vehicles.

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